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Journal of Dental Materials and Techniques، جلد ۱، شماره ۱، صفحات ۲۹-۳۴
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عنوان انگلیسی Finite Element Analysis of the Effect of Proximal Contour of Class II Composite Restorations on Stress Distribution
چکیده انگلیسی مقاله Introduction: The aim of this study was to evaluate the effect of proximal contour of class II composite restorations placed with straight or contoured matrix band using composite resins with different modulus of elasticity on stress distribution by finite element method. Methods: In order to evaluate the stress distribution of class II composite restorations using finite element method, upper right first molar and second premolar were modeled. Proximal boxes were designed and restored with universal Z250 and packable P60 composite resins (3M ESPE) using two matrix systems: flat Tofflemire matrix and precurved sectional matrix. Finally models were evaluated under loads of 200 and 400 Newton at 90 degrees angle and the results were graphically illustrated in the form of Von Misses stresses. Results: In general the stress obtained under 400 Newton load was significantly greater than the stress of models under 200 Newton load. Von Misses stress distribution pattern of two different Z250 and P60 composites were very similar in all modes of loading and proximal contour. In all analyzed models there was a significant difference between models restored with Tofflemire matrix with flat contour and models restored with sectional matrix with curved contour. This difference was greater in first molar than second premolar. Conclusion: Use of a contoured matrix band results in less stress in class II composite resin restorations.
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نویسندگان مقاله محمد جواد مقدس | mohammad javad moghaddas
dental research center, department of operative dentistry, faculty of dentistry, mashhad university of medical sciences, mashhad, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (Mashhad university of medical sciences)

حمیده عامری | hamideh ameri
dental research center, department of operative dentistry, faculty of dentistry, mashhad university of medical sciences, mashhad, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (Mashhad university of medical sciences)

حسین عباچی زاده | hossein abachizadeh
department of operative dentistry, faculty of dentistry, zahedan university of medical sciences, zahedan, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی زاهدان (Zahedan university of medical sciences)

نشانی اینترنتی http://jdmt.mums.ac.ir/article_90.html
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