نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه پریودانتیکس، دانشکده دندانپزشکی، دانشگاه علوم پزشکی قم، قم، ایران
2 استادیار ، گروه ارتودانتیکس، دانشکده دندانپزشکی، دانشگاه علوم پزشکی قم، قم، ایران
3 دندانپزشک ، قزوین، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Background: This study aimed to evaluate the effect of helix angle and thread pitch on orthodontic miniscrew stability using finite element analysis.
Methods and Materials: Five virtual miniscrew models were designed in SolidWorks software based on the commonly used JEIL miniscrew (Grade IV titanium). All models had a length of 8 mm, a diameter of 1.6 mm, and a thread depth of 0.25 mm, differing in helix angle or thread pitch. Model 1 had a 0.75 mm pitch, Model 2 was a double-thread screw, Model 3 a triple-thread screw, Model 4 had a 0.5 mm pitch, and Model 5 a 1 mm pitch. The models, along with surrounding bone, were subjected to 2 N of shear and tensile forces in Abaqus software. Stress distribution in bone was measured and compared between the different models.
Results: Under shear loading, the lowest bone stress (11.29 MPa) occurred in the double-thread model, while the highest stress (16.64 MPa) was observed in the triple-thread model. Regarding thread pitch, minimum and maximum stresses were recorded at 0.75 mm (12.94 MPa) and 0.5 mm (16.45 MPa), respectively. In tensile loading, bone stress increased with greater helix angle and larger thread pitch.
Conclusion: The double-thread miniscrew demonstrated optimal biomechanical stability under shear forces, whereas the 0.5 mm pitch model showed superior performance under tensile loading.
کلیدواژه‌ها [English]
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