Evaluation of in vitro resistance of different 2.0-mm titanium plates on the mandibular angle sectioning.

OBJECTIVE: The purpose of this study was to compare, by mechanical in vitro testing, a regular 5-hole plate and a long 4-hole plate with a regular 4-hole plate, applied to stabilize a simulated mandibular angle fracture. STUDY DESIGN: The plates from the 2.0-mm titanium-based system were adapted and stabilized passively in the same site in both groups using four screws, 6 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. RESULTS: The regular 5-hole plates and longer 4-hole plates were superior to the regular 4-hole plates. Furthermore, no statistically significant difference was found between the regular 5-hole plates and long 4-hole plate. CONCLUSIONS: The length and shape of plates did not interfere with the effectiveness to stabilize the fragments. OBJECTIVE: The purpose of this study was to compare, by mechanical in vitro testing, a regular 5-hole plate and a long 4-hole plate with a regular 4-hole plate, applied to stabilize a simulated mandibular angle fracture.Study design The plates from the 2.0-mm titanium-based system were adapted and stabilized passively in the same site in both groups using four screws, 6 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. RESULTS: The regular 5-hole plates and longer 4-hole plates were superior to the regular 4-hole plates. Furthermore, no statistically significant difference was found between the regular 5-hole plates and long 4-hole plate.Conclusions The length and shape of plates did not interfere with the effectiveness to stabilize the fragments.

Membranas absorvíveis x não-absorvíveis na implantodontia: revisão da literatura / Resorbable versus non-resorbable membranes in implantology: a review of the literature

Entre os tecidos altamente organizados, o osso tem o potencial de reconstruir sua estrutura original. Em condições estáveis, o osso é formado direta ou primariamente, sendo necessário que o suprimento sangüíneo e a base sólida para deposição óssea sejam mantidos de forma adequada. A regeneração óssea guiada baseia-se na criação de um espaço segregado para a invasão de vasos sangüíneos e células osteoprogenitoras,protegendo a reparação óssea contra o crescimento de tecidos não osteogênicos que possuem velocidade de migração maior que as células osteogênicas. As barreiras de membranas devem possuir características que conduzam requisitos biológicos, mecânicos e de uso clínico para servirem como barreira contra a invasão celular indesejável. A aplicação simultânea de barreiras de membranas em tratamento de defeitos ósseos periimplantares possibilita neoformação óssea com prognóstico significante. Além disso, o uso de membranas como um acessório para as técnicas de enxerto ósseo promove maior previsibilidade nas reconstruções alveolares e periimplantares. A técnica de regeneração óssea guiada é viável e de bom prognóstico, quando utilizada adequadamente e seguindo os requisitos básicos para sua correta aplicação.