Avalia??o mec?nica da utiliza??o de placas e parafusos de tit?nio e absorv?veis para fixa??o de osteotomia sagital do ramo mandibular

• Ano de defesa: 2019
• Autor(a) principal: Costa, Davani Latarullo
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontif?cia Universidade Cat?lica do Rio Grande do Sul; Escola de Ci?ncias da Sa?de; Brasil; PUCRS; Programa de P?s-Gradua??o em Odontologia
• Palavras-chave em Português: Sagital Split Ramus Osteotomy; Internal Rigid Fixation; Absorbable Plates; Biomechanical Evaluation; Osteotomia Sagital do Ramo Mandibular; Fixa??o Est?vel; CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: http://tede2.pucrs.br/tede2/handle/tede/8615

(Artigo 1 - Biomechanical evaluation of the use of absorbable plates for rigid fixation of sagital split ramus osteotomy) The rigid fixation of bone segments after mobilization has been purposes of study for many years. The use of plates and screws is responsible for a number of benefits to those who are used. Initial stability, fast and comfortable patient return to normal activities, good masticatory function and no need for maxillo-mandibular block for a long time; are some of the main advantages of rigid internal fixation. In addition to the titanium plates and screws can be used polyglycolic acid copolymers DL associated with the polylactide. This combination of features define plate and absorbable screw. Biocompatibility, less of genotoxicity, bioabsorption and easy handling are some characteristics of this material. However, similar initial stability to these plates still requires further studies. Therefore, the aim of this study is mechanically evaluate the stability of plates and absorbable screws in the technique of sagittal split osteotomy; the most widely used technique for jaw function in mandibular orthognathic surgery. Using a in vitro study, 15 hemimandibles (NACIONAL-JA?.SP) was evaluated with the design of the sagittal split osteotomy and fixed with different materials. Divided into 03 groups of five hemimandibles, the samples were submitted compression tests at different displacements. The displacements ranged from 1 to 5mm and the applied force was measured in Newtons (N). The results showed that there is a statistically significant difference in initial resistance when comparing conventional plates (Titanium) to absorbable plates. The conventional plates (titanuin) presented greater stability when compared to absorbable plates.