چاپ صفحه |  صفحه نخست سامانه |  نویسندگان |  اطلاعات تفضیلی |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| نویسنده | نفر چندم مقاله |
|---|---|
| بهنام میرزاکوچکی | سوم |
| عنوان | متن |
|---|---|
| خلاصه مقاله | Orthodontists desire that debonding of brackets do not occur during treatment period. Debonding of brackets increases the vulnerability of enamel to fracture and crack. Recently challenge is to develop a bond between orthodontic attachments and the enamel that is strong enough to accomplish treatment but can be broken for debonding without damage to enamel surface. Different factors affect bond strength of bracket- adhesive-tooth system. The effect of orthodontic bracket base configuration and enamel shape on shear bond strength has remained unclear despite its clinical significance. Shear bond test and stress analysis using finite element method (FEM) were used to investigate this problem from a biomechanical point of view. Micro CT scans were obtained from 6 different extracted teeth including mandible incisor, maxilla incisor, mandible and maxilla canine, mandible and maxilla first premolar (this work would enable us to investigate effect of enamel shape on bond strength). 3D geometries of each tooth were exported from Micro CT scans with mimics10 as STL files. Each STL file that is a collection of triangular meshes  was imported in HYPERMESH software, edited and converted to volume mesh. Different shapes of bracket base with the same cross section area were designed and bonded to each tooth one by one. A shear load was applied to bracket in each bracket- adhesive- tooth system after we applied proper boundary conditions (BC's must resemble the BC's of a tooth fixed in maxilla or mandible). Each system was analyzed by using ABAQUS software. At last stress-strain distribution and shear bond strength of systems were compared; the higher the Maximum principle stress, the lower the shear bond strength of bracket- adhesive- tooth system. Studies revealed that bracket base configuration and enamel shape have significant effect on shear bond strength. Finally the best bracket base configuration was obtained for each tooth. |
| کلمات کلیدی |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| wcb-conference2.pdf | 1400/07/07 | 1297215 | دانلود |
| bbbbbb.png | 1400/07/07 | 193045 | دانلود |
