Evaluation of in vitro resistance of titanium and resorbable (poly-L-DL-lactic acid) fixation systems on the mandibular angle fracture

Autor(es)

Bregagnolo, L. A. ^[1] ; Bertelli, P. F. ^[1] ; Ribeiro, M. C. ^[1] ; Sverzut, C. E. ^[1] ; Trivellato, A. E. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Oral & Maxillofacial Surg & Periodontol, Sch Dent Ribeirao Preto, BR-14040904 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Oral and Maxillofacial Surgery; v. 40, n. 3, p. 316-321, MAR 2011.
• Citações Web of Science: 10

Resumo

The purpose of this study was to compare, by mechanical in vitro testing, a 2.0-mm system made with poly-L-DL-lactide acid with an analogue titanium-based system. Mandible replicas were used as a substrate and uniformly sectioned on the left mandibular angle. The 4-hole plates were adapted and stabilized passively in the same site in both groups using four screws, 6.0 mm long. During the resistance-to-load test, the force was applied perpendicular to the occlusal plane at three different points: first molar at the plated side; first molar at the contralateral side; and between the central incisors. At 1 mm of displacement, no statistically significant difference was found. At 2 mm displacement, a statistically significant difference was observed when an unfavourable fracture was simulated and the load was applied in the contralateral first molar and when a favourable fracture was simulated and the load was applied between the central incisors. At the failure displacement, a statistically significant difference was observed only when the favourable fracture was simulated and the load was applied on the first molar at the plated side. In conclusion, despite more failure, the poly-L-DL-lactic acid-based system was effective. (AU)

• Processo FAPESP: 07/50163-2 - Resistência da fixação com placas e parafusos de titânio e absorvidas (ácido poli-L-D-lático) em fraturas favoráveis e desfavoráveis em ângulo de mandíbulas de poliuretano
• Beneficiário: Livia Aguiar Bregagnolo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica