The Evaluation of 41 Panoramic Radiographic Cases of Dentigerous Cysts and Odontogenic Keratocysts
Mahrokh
Imani Moghaddam
Assistant Professor, Dept. of MaxilloFacial Radiology, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Tayebeh
Mojeri Khazani
Dentist
author
text
article
2007
per
Introduction: Dentigerous cyst (DC) is the most common pathologic pericoronal radiolucency and the odontogenic keratocyst (OKC) radiographic features appear as unilocular, multilocular or pericoronal radiolucency. Since OKC is very invasive and has a high recurrence rate and its radiographic features are like dentigerous cyst and bone important lesions such as amelobastoma and mural ameloblastoma, it seems necessary to recognize radiographic features of these two cysts.The aim of this study was to compare panoramic radiographic findings in DC and OKC. Materials & Methods: In this descriptive (case series) study, 41 panoramic radiographs of 26 patients with DC and 15 patients with OKC, were evaluated by one maxillofacial radiologist as an observer.The radiographic information included persent pericoronal radiolucency , unilocular or multilocular radiolucency, smooth or scalloped periphery, impacted tooth, size and area of cyst, age and sex. Finally, the data were analyzed using Chi-square and T tests statistically. Results: one case of DC had multiolocular radiolucency, 4 cases of OKC had unilocular pericoronal, 2 cases had multilocular pericoronal, 2 cases had unilocular non-pericoronal radiolucency and 7 cases had non-pericoronal multilocular radiolucency. A significant relationship was detected among the mean age of patients, and mean area of cysts (P<0.05). Conclusion: Based on the present study, DC was more common in maxillary canine appearing mainly as a pericoronal unilocular pattern, while OKC was more common in mandible appearing mainly as a multilocular pattern.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
1
6
https://jmds.mums.ac.ir/article_1396_58a163e66922831600967ac2c7bb3ef2.pdf
dx.doi.org/10.22038/jmds.2007.1396
Evaluation of IL-1 Secretion Level by Human Osteoblast Cells Adjucent to White MTA, Dark MTA, Portland Cement & IRM as a Retrograde Filling Material
Maryam
Bidar
Associate Professor, Dept of Endodontics, School of Dentistry and Dental Research Center of Mashhad university of Medical Sciences, Mashhad, Iran
author
Jalil
Tavakol Afshari
Professor, Dept of Imunology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
author
MohammadHasan
Zarrabi
Professor, Dept of Endodontics, School of Dentistry and Dental Research Center of Mashhad university of Medical Sciences, Mashhad, Iran
author
Navid
Aghasi Zadeh
Assistant Professor, Dept of Endodontics, Dental School, Zahedan University of Medical Sciences, Zahedan, Iran
author
text
article
2007
per
Introduction: Ostetoblasts and ligament periodontal cells are the essential cells for wound repair after root-end resections and perforation repair. Osteoblast cells reaction in direct contact with filling materials play a critical role in wound repair after surgeries and perforation corrections. Cell attachment on material surfaces and cell secretory function is the primary phase for evaluation of normal cell function. The aim of this study was to morphologically evaluate osteoblast cells (MG-63) function and IL-1β secretory level adjacent to gray MTA, white MTA, Portland cement and IRM, as materials for root-end fillings and repairing perforations. Materials & Methods: Human osteoblast cells (MG-63) obtained from Iran Pasteur Institue. cell bank were grown in RPMI-1640 medium. The under study materials, following the company instructions, were mixed and seeded in 24, 1cmx1cm partition plates with the aproximate thickness of 1mm. The cells were added after the materials primary setting time. The cells were observed by a light microscope an day 1, 3 and 7. In the mentioned intervals, the cells supernants were collected and examined by ELISA and the amount of IL-1β in each specimen was measured in pg/ml. The turkey test was used for comparison of the data among different matreials and the Komogrov-Smirnov test was used for normalizing the resonses. Results:The cells morphological outcomes illustrated that after 7 days, a large amount of osteoblasts adjacent to gray and white MTA had the good attachment and morpholigically expansion and flat. The cells adjacent to Portland cement were found round and mostly seperated from the surface, although some flat cells could be found among them. Adjacent to IRM, all the cells were round and seperated from the plate surface. The level amount of IL-1β secretion adjacent to gray and white MTA was significantly more than to IRM and Portland cement (P=0.00). Adjacent to gray and white MTA, the amount of IL-1β secretion was not significantly different (P=0.77), also the IL-1β secretion level adjacent to Portland cement and IRM was not significantly different (P=0.187). Conclusion:The currrent study result indicates that human osteoblasts adjacent to gray MTA and white MTA, in comparison to Portland cement and IRM, showed a more appropriate response. Therefore we recommed the use of MTA over the other materials. Regarding Portland cement more research needs to be done in order to reach a final conclusion.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
7
16
https://jmds.mums.ac.ir/article_1397_c6194f4b582275559250748f40c58962.pdf
dx.doi.org/10.22038/jmds.2007.1397
A Comparison of Accuracy of Determining the Root Canal Working Length by Different Magnifications of Digital Radiography
Maryam
Javidi
Assistant Professor, Dept of Endodontics, Faculty of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Fatemeh
Nejad Nasrollah
General Practitioner
author
Mohsen
Seid Nozadi
Associated Professor, Dept of Community Medicine and Public Health, School Medicine, Mashad Medical School
author
text
article
2007
per
Introduction:Successful root canal therapy is related to cleaning, shaping and obturation of the root canal system with a proper limited working length. Therefore, these are achieved by knowledge of root canal anatomy and radiograph images. Current radiographic techniques are elementory methods. With the advancement of computer technology, and due to limitations that exist, in this recent decade significant attention has been given to digital radiography. Software programs for digital radiographic systems, such as magnification of different images is a tool assistant for digital systems in increasing precision. The purpose of this study was to compare different magnifications of digital radiography to determining canal length.
Materials & Methods: In this experimental in vitro study, 30 human anterior teeth were selected and cleaned in detergent. The actual working length was measured with a N.15 file. Then the teeth were casted and the files were inserted in canals in 3 different positions, proper, under and over. Ninety images of the teeth in three magnifications were made and working length was evaluated by three endodontists randomly. Then the Friedman test was used for statistical analysis.
Results:After statistical analysis, the results showed that there was no significant differences between the groups. But there is significant difference in 2X magnificantion of under working length to real working length.
Conclusion: In conclusion, it can be stated that magnification of digital radiography can not be helpful in determination of working length especially in under postion.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
17
24
https://jmds.mums.ac.ir/article_1398_7911bf24ab6c0065787b33db723cc276.pdf
dx.doi.org/10.22038/jmds.2007.1398
Oral Manifestations of Patients with Congenital Heart Disease
Hasan
Hoseinpour Jajarm
Associate Professor, Dept of Oral Medicine, School of Dentistry and Dental Research Center of Mashhad University of Medical Scineces, Mashhad, Iran
author
Hasan
Mottaghi-Moghaddam
Assistant Professor, Dept of Internal Medicine of Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2007
per
Introduction: Congenital heart disease (CHD) can have oral manifestations that even the patient may not be aware of. These manifestations could be linked to the disease itself or the treatment associated with it. Also, since a history of CHD may alter the treatment plan of some of the oral diseases or some oral diseases may affect the course of CHD, the current research was designed to better understand such interrelationships.
Materials & Methods: In this cross-sectional descriptive study, 42 CHD patients that were admitted to the department of Internal Medicine of Imam Reza Hospital, Mashhad, Iran, were randomly investigated for a period of one year through a questionnaire and routine examinations and the final results are descriptively presented.
Results: In 17 cases (40.5%), cyanotic mucosa was reported and in 6 cases (14.4%) pale tissues were noted. In 2 cases cleft palate (4.7%) and cleft lips (4.7%) were recorded.
Conclusion: Oral manifestations recorded for patients with CHD were Cyanosis, pale tissues and cleft and palatte and lip. Although clefting and palate lip can not be directly linked to CHD, their presence in conjunction with CHD should be considered.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
25
30
https://jmds.mums.ac.ir/article_1399_4ac2a8f3672752727b12a31dbe6edd8b.pdf
dx.doi.org/10.22038/jmds.2007.1399
Invitro Comparison Between the Effects of Two Tooth Bleaching Agents on Surface Micro Hardness of Microhybrid Composite
Zahra
Khamverdi
Assistant Professor, Dept of Operative Dentistry, Dental School, Hamedan University of Medical Sciences, Hamedan, Iran
author
Shahin
Kasraee
Assistant Professor, Dept of Operative Dentistry, Dental School, Hamedan University of Medical Sciences, Hamedan, Iran
author
text
article
2007
per
Introduction: Tooth whitening products may have effects on various properties of restorative materials including hardness. This study investigated the effects of two at-home bleaching agents (Kimia 16%, Opalescence PF 15%) on hardness of a microhybrid composite.
Materials & Methods: Thirty cylindrical-shaped specimens of microhybrid composite Z250 (3M, Dental Products, USA) with 5mm diameter and 2mm height were prepared and divided into three treatment groups comprising a control and two different bleaching groups. Control specimens were stored in distilled water for two weeks. Specimens of bleaching groups were exposed to the bleaching agents (Kimia 16% the first bleaching group and opalescence 15% for the second group) 1 hour daily for 2 weeks. After treatment, the hardness of specimens was tested using Vickers-test Instrument under 300 gr load for 15 seconds. The data were analyzed using One-way ANOVA and Tukey tests (α=0.05).
Results: The mean composite microhardness for control, Kimia and Opalescence groups were 97.93±4.59, 95.56±2.75 and 86.57±2.59 respectively. It was observed that the bleaching materials softened the composite Z250. However, ANOVA showed the difference between Kimia group and control group was not significant (P=0.280)). Hardness of Opalescence group was significantly lower than the two other groups (P=0.000).
Conclusion: Regarding the decreased microhardness of microhybrid composite, Kimia 16% at-home bleaching agent is more desirable than Opalescence PF 15%.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
37
46
https://jmds.mums.ac.ir/article_1400_966c77576fc4e0f1a08883b616d4176b.pdf
dx.doi.org/10.22038/jmds.2007.1400
Evaluation of Relationship Between Orthodontic Treatment Need According Dental Aesthetic Index (DAI) and Student’s Perception in 11-14 Year Old Students in the city of Ahwaz in 2005
Mashallah
Khanehmasjedi
Assistant Professor, Dept of Orthodontics, Dental School, Ahwaz University of Medical Sciences, Ahwaz, Iran
author
Leila
Bassir
Assistant Professor, Dept of Pedodontics, Dental School, Ahwaz University of Medical Sciences, Ahwaz, Iran
author
MohammadHosien
Haghighizadeh
Master of Sciences in Statics, Ahwaz Jundishapur University, Ahwaz, Iran
author
text
article
2007
per
Introduction:In contemporay orthodontics, the number of people who demand orthodontic treatment for improving their psychosocial problems retated to facial esthetic has been increased. Even in treatment planning more attention has been give to appearance and esthetic. The purpose of this study was to determin relationship between orthodontic treatment required according to the Dental Aesthetic Index (DAI) and student’s perception in 11-14 year- olds in Ahwaz.
Materials& Methods: This decriptive cross sectional study was performed on 900 students (450 girls, 450 boys). The students that participated in this study were those who did not received any orthodontic treatment before or at the time of the study. Two questionnaires were used, the first one included different DAI criteria and second one included some questions about the students' perception on the appearance of their teeth. The results were analyzed by Chi-Square test and T-test.
Results:In 70.9% students DAI score was 13-25, which indicates no treatment to minimal treatment is necessary. In 19.2% students DAI score was 26-30 which presented definite malocclusion with optional treatment. In 7.8% students DAI score was 31-35 that which showed sever malocclusion with treatment highly desirable. In 2.1% students, the DAI score was greater than 35 which showed very sever malocclusion and treatment is mandatory. The relationship between the DAI Score and sex, chewing and talking were not statistically significant. But the relationship between the DAI score and orthodontic treatment need and satisfaction of dental appearance were significant (P=0.000).
Conclusion: In comparison to other studies, the students in Ahwaz had a better dental appearance and minimal need for orthodontic treatment.
A significant relationship exists between the need for orthodontic treatment and student’s perception (P=0.000).
In comparing the two sexes, boys had a greater need for orthodontic treatment, but is not statistically significant.
The relationship of the DAI score and a person's satisfaction of dental appearance, anxiety in laughing, person's appearance in relation to other students and being ridiculed were significant (P=0.000).
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
37
46
https://jmds.mums.ac.ir/article_1401_8c12804866e6c3fce3ffce9f735e70e7.pdf
dx.doi.org/10.22038/jmds.2007.1401
An In Vitro Evaluation on Shear Bond Strength of Three Resin Luting Cement Systems in Bonding of Base Metal Alloy and Ceramco and Inceram Porcelains to Dentin
Shahin
Rezaei Rokni
Professor, Dept of Porosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
SayedMostafa
Moazzami
Associate Professor, Dept of Oprative and Esthetic, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Fahimeh
Hamedi Rad
Assistant Professor, Dept of Porosthodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran
author
text
article
2007
per
Introduction:Developed synthetic resin cement are recommended for cementation of crown and bridges. Bonding of adhensive resins to ceramic, metal, enamel and dentin is an important factor for a successful clinical restoration. The purpose of this study was to determine the shear bond strength of 3 luting cement systems (Dual cure, self Cure and resin modified glass inomer) for bonding the base metal alloy, Ceramco and Inceram porcelain to dentin.
Materials & Methods:In this experimental study, 90 extracted human teeth were prepared and buried in self cure acrylic resin while the buccal surface remained out of the acrylic material. The enamel of the buccal surface were removed and a flat surface was obtained on the dentin. Thirty blocks of base metal alloy, Ceramco laminate porcelain and Inceram were prepared with the dimensions of 6x4x2mm, and divided into 3 subgroups. Each subgroup was cemented with C & B Metabond, Panavia F and Rely X to dentin. After that, they were thermocycled between 5oc to 50oc for 500 cycles, the shear bond strengths were measured in an universal testing machine. Finally, the specimens were inspected under a stereomicroscope with a magnification of 40 to determine the modes of failure. The data were analysed using SPSS software (2-way ANOVA, Duncan's test and Fisher's Exact test).
Results:Maximum shear bond strength in bonding of 3 experimental plates to dentin with 3 adhesive resin systems are as follows: Panavia F for base metal plates (15.316±2.925 MPa), C&B Metabond for Ceramco porcelains (11.789±1.730 MPa) and Inceram porcelains (10.512±3.249 MPa).
Conclusion:Within the limitation of this study, the best cement for cementation of base metal plates was Panavia F or C & B Metabond cement. Among these three evaluated cements,C&B Metabond cement proved to be better for cementation of Ceramco porcelains to dentin and C&B Metabond or Panavia F for cementation of Inceram plates to dentin.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
47
54
https://jmds.mums.ac.ir/article_1402_31515c2034a50645f695dc91c42914c3.pdf
dx.doi.org/10.22038/jmds.2007.1402
Evaluation of Height of Facial Alveolar Crest and Pocket Depth Following Periodontal Flap Surgery With and Without Crestal Bone Exposure
Naser
Sargolzaee
Assistant Professor, Dept of Periodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
HamidReza
Arab
Associate Professor, Dept of Periodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Amir
Moeintaghavi
Associate Professor, Dept of Periodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Habinollah
Ghanbary
Associate Professor, Dept of Periodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2007
per
Introduction: Surgery is one treatment modality for periodontal diseases that can stimulates osteoclastic activity and results in resorption of alveolar crestal bone. The aim of this study was to compare the effect of two procedures of periodontol surgery on resorption of alveolar crestal bone.
Materials & Methods: Twenty patients were selected from patients referred to our dental school. After initial therapy, the surgical treatments were performed by a surgeon and the study was performed with split mouth design. One side was treated with an apically positioned flap (APF) with bone exposure (20 quadrants) and on the opposite side APF without bone exposure (20 quadrants). At the time of surgery the distance between CEJ to bone crest was recorded. After two months, the patients were examined for the same parameters using the bone sounding technique.
Results: According to the results, in sites with apically positioned flap with bone exposure, crestal resorption was 0.77±0.63 and on the opposite side it was 1.05±0.79 mm. The difference between the two sides was not significant. Pocket changes were significant in both techniques but there was not any significant differences between the two procedures.
Conclusion: According to the results of this study, similar alveolar crestal bone resorption occurred during the healing process in the two procedures and this resorption may have an important role in reconstruction of biologic width.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
55
62
https://jmds.mums.ac.ir/article_1403_47391537ace9b42d57e733986a965e85.pdf
dx.doi.org/10.22038/jmds.2007.1403
Effects of Alloys on Porcelain Color in Three Types of Base Metals
MohammadReza
Sabooni
Assistant Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Jalil
Ghanbarzadeh
Assistant Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Ahmad
Mamavi
Dentist
author
text
article
2007
per
Introduction: Color matching, visual combination and accurate shade selection with natural teeth are important issues in restorative dentistry. In ceramometal restorations, the type of substructure alloy affects the final color of bonded porcelain. Minalux alloy, is the most commonly used Iranian product which is a base metal alloy (Ni-Cr). The aim of this study is to compare the effect of three base metal alloys (Wirron 99, Bellabond and Minalux) on their masking of porcelain color and to assess various color dimentions between them.
Material & Methods: In this in vitro study, ten disks, approximately 0.3 mm thick and 1 cm diameter, were prepared from each alloy. Then a 1 mm thickness layer of vita VMK68 porcelain shade A2 was baked onto them, following the manufacture's instruction. Ten samples with 5 mm thickness were prepared from the same porcelain and designated the "control group". All samples, with similartining and in similar conditions of environmental light were assessed by a computer colorimetry instrument; and color values such as l*, a* and b* under CLE-LAB system were measured. The data were analyzed by one-way-Anova and Tukey tests.
Results: Three alloys in this study as compared with the control group, had significant effect on the three variables l*, a* and b* (respectively P=0.004, P=0.037, P<0.001). In these alloys, Wirron 99 and Bellabond, had significant difference on the two variables l* (P-value=0.025) and a* (P-value=0.037); but Minalux alloy did not have any significant difference with other groups. The comparison between the average of ΔE quantities alloys, indicated that the difference of Vita porcelain shade A2 baked on Wirron 99 and Bellabond was significant.
Conclusion: The effect of Iranian minalux alloy on color's parts and it's related ΔE quantity, is in a similar range of two foreign alloy products Wirron 99 and Bellabond.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
63
70
https://jmds.mums.ac.ir/article_1404_e436863094decf5780d599279679ba96.pdf
dx.doi.org/10.22038/jmds.2007.1404
The Frequency of Cleft Lip and Palate and the Celated Risk Factors in a Group of Neonates in the City of Kerman during 1994-2002
Doya
Sadri
Assistant Professor, Dept of Oral Pathology, School of Dentistry, Tehran Islamic Azad University of Medical, Tehran, Iran
author
Nasrin
Ahmadi
Dentist
author
text
article
2007
per
Introduction: Orofacial clefts are the most common congenital clefts in humans. Etiology of oral clefts is multifactorial (genetic and environmental factors) and prevalence of oral clefts is different among various ethnic groups. The aim of this study was to determine the frequency of oral clefts and risk factors related to it among a group of newborns in Iran.
Materials & Methods: This descriptive study was performed on 147500 files of newborns (1994-2002) in Mahdieh and Akbarabady Hospital in Tehran. The files of 193 files of newborns with oral clefts, 240 normal newborns as control group and their mothers were evaluated. Demographic data along with information about (sex, weight, prematurity, type of oral clefts) of newborns and age, drug consumption and familial matrimony of mothers were recorded. Data were analized by SPSS 10 software and the Chi-square test.
Results: Out of totally 147500 newborns 193 cases had oral clefts (1.3 for 1000 brirth), 46.11% had cleft lip+cleft palate), 29.01% had (cleft lip) and 24.87% had cleft palate). Male to female ratio was 1.27. Oral clefts were significantly higher in low weight newborns (<2500 gr) (P<0.001, OR= 3.2). A significant relationship was found between familial matrimony of parents (P<0.001, OR=27), age of mother and systemic disease the mother and organic disorders. (P=0.04, OR=2.6, OR=2.3) with oral cleft in new borns. In 50% of newborns with cleft palate had other skeletal.
Conclusion: The present study showed that frequency of oral clefts in the studied population was 1.3 for 1000 births, which is similar to other research results in Iran. On the base of this study low birth weight of newborns (<2500 gr), familial matrimony of parents, age of mother and systemic disease of her and large size family are the most predisposing factors associated with oral clefts, respectively A prenatal care program for pregnant women and genetic consultation in high risk groups is recomended.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
71
76
https://jmds.mums.ac.ir/article_1405_0a09d66df6f021cdf29dc05e2cbc0eda.pdf
dx.doi.org/10.22038/jmds.2007.1405
Evaluation of the Effect of Adjunctive Use of Calcium Hydroxide Combined with Periodontal Dressing on Dentin Hypersensitivity after Periodontal Surgery
HamidReza
Arab
Assistant Professor, Dept of Periodontology, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Naser
Sargolzaee
Assistant Professor, Dept of Periodontology, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Marzieh
Shahi
Endodontics
author
text
article
2007
per
Introduction: Dentinal hypersensitivity is one of the most common complications which many patients complain in different ways. Dentinal hypersensitivity is caused by the opening of dentinal tubules to an oral cavity due to fractures, attritions, etc. It is a common complications after periodontal surgery. Many treatments have been suggested for this problem, till now. Calcium hydroxide is one of the materials used for treatment of root hypersensitivity after periodontal surgery. The aim of this study was to evaluate the effect of calcium hydroxide combined with periodontal dressing on root hypersensitivity after periodontal surgery.
Materials & Methods: This study was done on 30 patients with severe periodontitis who needed periodontal surgery for both quadrants in each jaw. In each patient one quadrant was treated as a test and the other side was used as a control. In the test group 90mg of Calcium Hydrixude powder mixed with 1cm of Co-pack covered the site surgical. Twenty-one patients completed the procedure After surgery, a periodontal dressing combined with calcium hydroxide covered the area on the test side. The other side was used as a control and covered with a pure dressing. After one week the dressing was removed and the amount of hypersensitivity was measured with air flow and an explorer using the visual analog scale. Data were analyzed using the Wilcoxon sign rank test.
Results: The results showed that there were not any significant differences between the two sides in root sensitivity, but Plaque index in the test sides was lower than the control side.
Conclusion: The periodontal dressing can not be used as a carrier for calcium hydroxide to reduce root hypersensitivity after periodontal surgery. Decrease in plaque accumulation after using the combination of calcium hydroxide and periodontal dressing may accelerate surgical wound healing but further investigations are necessary.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
77
82
https://jmds.mums.ac.ir/article_1406_0b074d885dbbe0d1aef6ab67bb35539d.pdf
dx.doi.org/10.22038/jmds.2007.1406
Comparing the Bacterial Leakage in Endodontic Therapy Following Using EDTA as a Irrigation and AH26 or Tubliseal as Selars
AliReza
Farhad
Assistant Professor, Dept of Endodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
author
Asghar
Havaie
Assistant Professor, Dept of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
author
Behnaz
Barekatain
Endodontist
author
Tahmineh
Narimani
Master of Science in Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
author
text
article
2007
per
Introduction:Complete root canal seal is one of the most important aims of root canal treatment. For this purpose, elimination of the smear layer and the kind of sealer used have important roles. The aim of this study was to compare the sealing ability of two sealers (ZOE and resin based) against the microleakage of entrococcus faecalis when used in association with three different root canal irrigants (17% EDTA, 7% citric acid, 20% citric acid).
Materials & Methods:In this experimental study, 170 single - rooted extracted human teeth were selected. Step back canal preparation was performed to Iso size No. 40 in the apical portion of the canals with 5.25% Naocl irrigation. The teeth were randomly divided into 8 groups: six experimental groups of 25 teeth and two control groups of 10 teeth. Final irrigation in groups 1 and 2 was preformed with EDTA+NaClO; in groups 3 and 4 with 7% citric acid+NaClO; and in groups 5 and 6 with 20% citric acid+NaClO. Groups 1, 3 & 5 were obturated with guttapercha and AH26 sealer, and groups 2, 4 & 6 with guttapercha and Tubliseal sealer using lateral condensation. The 10 positive control teeth were obturated with a single guttapercha cone and the 10 negative control teeth were thoroughly obturated with gutta-percha and sealer.After 48 hours in 100% humidity and 37ºc temperature, the roots were assembled in the designed system for this experiment. A fresh solution of entrococus faecalis was injected to the system every 3 days. The samples were evaluated daily for 160 days and the time of culture contamination with E. faecalis was registerd in each case. ANOVA and Duncan tests were used to analyze the results.
Results: All the samples in positive control group were infected after 24 hours. None of the negative control samples were infected after 160 days. Group 1 (EDTA+AH26) and group 3 (7 %citric acid+AH26) had no significant difference with group 2 (EDTA+Tubliseal) and group 5 (20% citric acid+AH26), but group 2 and 5 were significantly different (P<0.001). Group 4 (7% citric acid+Tubliseal) was not significantly different from group 6 (20% citric acid+Tubliseal) but they both were significantly different from the other four groups (P<0.001).
Conclusion:In this study 20% citric acid used in association with AH26 showed the greatest microleakage mean time. The least microleakage mean time occurred in the group for which 20% citric acid was used in association with Tubliseal.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
83
92
https://jmds.mums.ac.ir/article_1407_861d8ac41cc5ac2d155479e8102a7e89.pdf
dx.doi.org/10.22038/jmds.2007.1407
Oral Mycotic Flora and Its Association with Dental Caries in Babol Dental Students in 2005
Maryam
Ghasempour
Assistant Professor, Dept of Pediatric Dentistry, Dental School, Babol University of Medical Sciences, Babol, Iran
author
AliAsghar
Sefidgar
Assistant Professor, Dept of Mycology, Dental School, Babol University of Medical Sciences, Babol, Iran
author
Mahmoud
Haji Ahmadi
Assistant Professor, Dept of Biostatistics, Babol University of Medical Sciences, Babol, Iran
author
Mahmoud
Khosravi Samani
اAssistant Professor, Dept of Periodontics, Dental School, Babol University of Medical Sciences, Babol, Iran
author
Elaheh
Sadeghi
Dentist
author
text
article
2007
per
Introduction:Candida albicans is colonized on different oral surfaces such as tongue, palate, dental caries and plaques. Different factors like age, sex, diet, dietary habits and oral hygiene play role in amount and severity of colonization of this microorganism. Our goal was to determine the relationship between the existence of Candida albicans in oral cavities and dental caries in students of dentistry.
Materials & Methods:This descriptive-analytical study was performed on 121 students of Babol dental school without any history of systemic disease and use of antibiotics or streoidal drugs. After explaining study goals and getting informed consent, the students' demographic information and medical histories were recorded in data sheets. Then clinical examination for determination of DMFT and plaque index was done. Salivary PH was measured. Dental plaque samples were cultured. Data were analysed by SPSS 10.5 using Student t-test, Fisher's Exact test, Mann-Whitney U test and Chi-Square test.
Results:63 (52.1%) students were male and 58 (47.9%) female. The mean age was 24.61±5.2 years. Candida culture was positive in 53 (43.8%) salivary and 51 (42.1%) plaque samples which in 50(94.3%) of salivary and 45 (88.3%) of plaque cultures was Candida Albicans. 44 students (36.4%) were caries free. The positive Candida cultures were more common in students with more dental caries, less than 7 restorations, oral PH<7, and moderate dental plaque (P<0.05). It was also more common among smoker students. Presence of Candida Alicans in saliva and plaque samples had no relationship with sugar intake, number of brushing times and sex.
Conclusion:Dental caries have significant relationship with existence of Candida Albicans in mouth, low salivary PH and smoking (P<0.05). Candida Albicans is the most common type of Candida in oral cavity.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
93
104
https://jmds.mums.ac.ir/article_1408_7e5b7f714118be4f71d337389a74e021.pdf
dx.doi.org/10.22038/jmds.2007.1408
In vitro Investigation of the Amount of Targis Wear Comparded to Enamel, Porcelain and Composite
Jalil
Ghanbarzadeh
Assistant Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Reza
Goharian
Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Hamid
Atighi
Prosthodontist
author
text
article
2007
per
Introduction:In an ideal situation, the wear resistance of a restorative material should be similar to dental enamel. This study was performed to observe the wear resistance of targis wear compared with porcelain, composite, and natural enamel.
Materials & Methods:In this in vitro study, 120 samples (2×8×13mm) were prepared including 60 Targis samples (140 Dentin Targis veneered with S1 Incisal Targis), 20 porcelain samples (VITA VMK95-A2 Incisal), 20 composite samples (Tetric-ceram HB-A2) and 20 natural enamel samples (buccal surface of maxillary central tooth). The samples were mounted in Acrylic block and placed in a wearing machine (periods=30000 times, frequence=198 cycles per second, pressure=300gr invironment=artifitial saliva solution) after finishing by silicone carbide paper (240-1000) for 20 minutes. The samples were studied in three groups: Targis-Porcelain, Targis-Composite and Targis- Enamel. Vertical reduction of each sample was measured by a digital caliper (Mitutoyo, Japan) with a precision of 0.01mm. The results were analyzed by a T-test and SPSS software.
Results:Porcelain was 3.5 times more resistant to wear than Targis and the difference was statistically significant (P<0.05). The wear resistance of targis was not significantly different from Tetric ceram HB composite (P>0.05). When compared to enamel, it was observed that Targis was less wear resistant but the difference was not significant (P>0.05).
Conclusion: According to the results, targis, having suitable mechanical properties, maybe a good alternative for porcelain composite.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
105
110
https://jmds.mums.ac.ir/article_1409_95195102fcc59545f2d83394b2e39602.pdf
dx.doi.org/10.22038/jmds.2007.1409
In vitro Investigation of The Wear Quantity of Targis Opposing The Enamel, Porcelain and Composite
Ramin
Mosharraf
Associate Professor, Dept of Prosthodontics, Isfahan University of Medical Sciences, Isfahan, Iran and Member of Torabinejad Dental Research Center
author
Mana
Noor-Allah
Dentist
author
AliReza
Rejaee
Dentist
author
text
article
2007
per
Introduction: Fracture of acrylic resin denture base is a common problem in maxillary dentures. Because the stresses in mouth on the denture base are of flexural type, the aim of this study was to determe the effect of palatal shape combined with acrylic resin thickness on the flexural strength of the denture base.
Materials & Methods: In this experimental study, 48 stone casts in 3 groups (shallow, medium and deep palatal vault) were prepared. Eight casts of each palatal form were covered with a single layer of base-plate wax and eight were covered with two layers. Patterns were invested and processed with Acropars acrylic resin in the same manner. Flexural strength, deflection and fracture load were measured with DARTEC testing machine. Statistical analysis was performed using multivariate ANOVA, Kruskal-Wallis and Mann Whitney tests.
Results: The results showed that the flexural strength of shallow bases were significantly different from medium and deep palatal shapes at both thicknesses (P<0.001). There were no statistically significant differences in flexural strength between the medium and deep palatal shapes (P=0.583). Increasing the base thickness significantly increases the flexural strength in each palatal shape (P<0.001).
Conclusion: This study revealed that palatal shape and base thickness have significant effects on flexural strength of denture bases. In shallow palates, increasing the thickness of denture base can enhance flexural strength of denture.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
111
116
https://jmds.mums.ac.ir/article_1410_442d38eda02b69dc2feb8f975785f1a8.pdf
dx.doi.org/10.22038/jmds.2007.1410
The Effect of Filler on Microleakage of Self-etch Adhesives with Dentin and SEM Interfacial morphology evaluation
Fatemeh
Maleknejad
Associate Professor, Dept of Operative Dentistry, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
MohammadJavad
Moghaddas
Assistant Professor, Dept of Operative Dentistry, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Bita
Lachin
Assistant Professor, Dept of Operative Dentistry, Dental School, Kerman University of Medical Sciences, Kerman, Iran
author
text
article
2007
per
Introduction:One of the most important disadvantages of using of tooth colored restorations is microleakage. This is more noticeable when there is a cavity with dentinal walls. Despite all improvements in dentin bonding agents, thusfar, no adhesive has been able to overcome microleakage between resin-dentin. The purpose of this survey is investigating the effect of filler on microleakage of self-etch adhesives with dentin and SEM interfacial morphology evaluation.
Materials & Methods:Class V cavities were made on extracted human premolars (n=60). Then the teeth were randomly divided into 6 groups based on type of adhesives used. Next teeth were grouped as filled adhesive (Xeno III, Clearfil SE Bond, Excite) and three grouped as unfilled adhesive (iBond, Bistite II, Single Bond). After restoration, specimens were treated by thermocycling and a dye penetration test was done. Then longitudinal sections were made toward the direction of the buccal lingual and were observed carefully under a stereomicroscope for any leakage. From each group, 2 samples were prepared for investigating micromorphology of resin under an SEM electronic mircroscope. Data was analyzed by the Kruskal-Wallis test and Mann-Whitney test with an accuracy level of 0.05%.
Results:Using the Mann-Whitney test, it was clear that in the one-step self-etch adhesive, the filled type (Xeno III) had reduction in microleakage compared to the unfilled type (i Bond). On the two-step self-etch and total etch adhesives, there was no significant difference between filled and unfilled adhesive in reduction of microleakage. In SEM investigations self-etch adhesives make thinner hybrid layers, but there are more resin tags with more regularity in this system and resin is well penetrated in the spaces due to demineralization and was polymerized.
Conclusion:The filled type of one-step self-etch adhesive (Xeno III) had more reduction in microleakage than other groups. There was no significant difference between the two types (filled and unfilled) two-step self-etch and total etch adhesives in reduction of microleakage. It was clear that if self-etch adhesive is used carefully give better sealing compared to total etch adhesive. Because they can infiltrate the spaces made due to demineralization and get polymerized.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
117
124
https://jmds.mums.ac.ir/article_1411_14bf28f6ff17a4f1372fefb678e12e6f.pdf
dx.doi.org/10.22038/jmds.2007.1411
Radiographic and CT Scan Evaluation of Root Resorption of Permanent Incisors Maxillary Impacted Carises
Shahla
Momeni Danaei
Associate Professor, Dept of Orthodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
author
Shoaleh
Shahidi
Assistant Professor, Dept of Oral Medicine, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
author
text
article
2007
per
Introduction:Resorptions of permanent incisors are a rare complication of ectopically erupting maxillary canines but when they occur they may lead to extraction, orthodontic treatment or both. The purpose of this study was to assess the incisor root resorption adjacent to impacted maxillary canines using conventional radiographs and CT scan.
Materials & Methods:Fourteen patients (13-20 years) with 18 impacted canines were studied. Upper alveolar bone CT scans of the patients and their periapical and panoramic images were analyzed for detecting incisor root resorption caused by impacted canines. Degree of root resorption was assessed on CT scans on the basis of the self-designed classification. Buccolingual, mesiodistal and superioinferior location of resorption of incisors’ roots and their longitudinal extension were assessed using CT scans in regard to the number of CT cuts showing the resorption.
Results: All of the teeth adjacent to impacted maxillary canines showed resorption. The most prevalent resorption site (84.6%) was detected in lateral incisors. 61.5% of involved teeth in CT scan did not show any resorption in the conventional radiographs and the others (38.5%) were questionable. In 77% of cases, resorption of palatal and distopalatal surfaces of involved roots were not detectable in conventional radiographs. Assessment of canine eruption angle in panoramic radiography revealed that this angle did not have any significant role in developing root resorption of adjacent teeth.
Conclusion: Conventional radiographs are not able to detect root resorption of the incisors adjacent to impacted canines. Therefore, in cases which intensity and extension of root resorption has an effect on treatment plan and prognosis, CT scan is strongly recommended.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
125
132
https://jmds.mums.ac.ir/article_1412_7e1615ef7d02424035792bdf7fbbd2b0.pdf
dx.doi.org/10.22038/jmds.2007.1412
Association Between HLADRB1 04* and HLAADQB106* with Severe Early Childhood Caries
Hosein
Nematollahi
Assistant Professor, Dept of Pediatric Dentistry, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Jalil
Tavakol Afshari
Associate Professor, Dept of Immunology, Mashhad University of Medical Sciences, Mashhad, Iran
author
Ali
Bagherian
Assistant Professor, Dept of Pediatric Dentistry, Dental School, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
author
text
article
2007
per
Introduction: Severe Early Childhood Caries (SECC) is one of the most common diseases in childhood. Etiology of SECC is multifactorial and both genetic and environmental factors play important roles in the pathogenesis of the disease. Genetic variation of the host may contribute to susceptibility for dental caries. Genetic factors such as Human Leukocyte Antigen (HLA) have been recently introduced as a predisposing factor. The aim of this study was to look for an association between HLA-DRB1*04 and HLADQB1*06 with SECC for early diagnosis as well as prevention of the disease.
Materials & Methods: In this cross-sectional study we extracted the genomic DNAS from the whole blood samples of 44 patients with SECC and 35 caries free children (control group) by salting out method. We amplified the genomic DNA by PCR sequence specific primer (PCR-SSP) and then HLA-typing was performed for both alleles. The data were analyzed using Logistic Regression, Fisher's exact, chi-square and Student t test with 95% significance level.
Results:The results revealed a significant increase in the frequency of HLADRB1*04 in the patient group (P-value=0.019). The odds ratio for this allele was detected to be 10. Frequency of HLA-DQB1*06 allele was not significantly different between the two groups (P-value=0.37).
Conclusion:The above results suggest that HLA-DRB1*04 maybe related to the susceptibility to SECC. Thus HLA-DRB1*04 detection as a molecular marker for early diagnosis of SECC can be recommended.
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
133
140
https://jmds.mums.ac.ir/article_1413_87704767e99278eec4be0a1db3856be2.pdf
dx.doi.org/10.22038/jmds.2007.1413
Assessment of Canal Configuration in Maxillary First Premolars and Mandibular Second Premolars in the City of Isfahan
SeyedMohsen
Hasheminia
Assistant Professor, Dept of Endodontics, Faculty of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
author
Ali
Hashemi
Dentist
author
text
article
2007
per
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
141
148
https://jmds.mums.ac.ir/article_1414_901c435d22c5548535ca75615f835aa8.pdf
dx.doi.org/10.22038/jmds.2007.1414
Plasma Cell Gingivitis (Case report)
Habibollah
Ghanbari
Associate Professor, Dept of Periodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
Zahra
Baghani
Associate Professor, Dept of Periodontics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran
author
Nooshin
Mohtasham
Assistant Professor, Dept of Maxillofacial Pathology, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2007
per
Journal of Mashhad Dental School
Mashhad University of Medical Sciences, School of Dentistry
1560-9286
31
v.
شماره 1,2
no.
2007
149
154
https://jmds.mums.ac.ir/article_1415_947978b5446e85cc75b7a0c56dee77df.pdf
dx.doi.org/10.22038/jmds.2007.1415