Elastic modulus of posts and the risk of root fracture

Autor(es)

Meira, Josete B. C. ^[1] ; Esposito, Camila O. M. ^[1] ; Quitero, Mayra F. Z. ^[1] ; Poiate, Isis A. V. P. ^[1] ; Pfeifer, Carmem Silvia C. ^[1] ; Tanaka, Carina B. ^[1] ; Ballester, Rafael Y. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Dent Mat, Sch Dent, BR-05508000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: DENTAL TRAUMATOLOGY; v. 25, n. 4, p. 394-398, AUG 2009.
• Citações Web of Science: 19

Resumo

The definition of an optimal elastic modulus for a post is controversial. This work hypothesized that the influence of the posts' elastic modulus on dentin stress concentration is dependent on the load direction. The objective was to evaluate, using finite element analysis, the maximum principal stress (sigma(max)) on the root, using posts with different elastic modulus submitted to different loading directions. Nine 3D models were built, representing the dentin root, gutta-percha, a conical post and the cortical bone. The softwares used were: MSC.PATRAN2005r2 (preprocessing) and MSC.Marc2005r2 (processing). Load of 100 N was applied, varying the directions (0 degrees, 45 degrees and 90 degrees) in relation to the post's long axis. The magnitude and direction of the sigma(max) were recorded. At the 45 degrees and 90 degrees loading, the highest values of sigma(max) were recorded for the lowest modulus posts, on the cervical region, with a direction that suggests debonding of the post. For the 0 degrees loading, the highest values of sigma(max) were recorded for higher modulus posts, on the apical region, and the circumferential direction suggests vertical root fracture. The hypothesis was accepted: the effect of the elastic modulus on the magnitude and direction of the sigma(max) generated on the root was dependent on the loading direction. (AU)

• Processo FAPESP: 05/56067-0 - Influencia do formato do pino no risco de fratura radicular longitudinal - estudo por aef.
• Beneficiário: Mayra Zamboni Quitero Siciliano
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 07/00191-0 - Efeito torque em pinos intra-radiculares com achatamento mésio-distal
• Beneficiário: Carina Baptiston Tanaka
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 05/53069-1 - Sobre a biomecânica de pinos intra-radiculares
• Beneficiário: Josete Barbosa Cruz Meira
• Modalidade de apoio: Auxílio à Pesquisa - Regular