Mechanical and fractographic analysis of two national brands of 2.0mm locking fixation systems in simulated mandibular body fracture

Author(s)

Raquel Correia Medeiros

• Document type: Master's Dissertation
• Press: Piracicaba, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
• Defense date: 2013-06-18

Examining board members

Roger William Fernandes Moreira; Frabrício Moreira Serra e Silva; Marcelo Marotta Araujo

• Advisor: Roger William Fernandes Moreira

Abstract

This study aimed to comparatively evaluate the resistance of two brands of rigid fixation system with 2,0 mm locking system in hemimandibles of aluminum with simulated fracture of the mandibular body. Also, perform fractographic analysis of the same, by Scanning Electron Microscopy (SEM). Four hemimandible of aluminum with a sectioning linear simulating fracture of mandibular body were used as substrate and fixed according to two techniques for two national brands Tóride® (Tóride Indústria e Comércio Ltda. - Mogi Mirim, São Paulo - Brazil) and Traumec® (Traumec - Orthopedic Implants and Technology Imp. e Exp Ltda. - Rio Claro, São Paulo, Brazil). The techniques were: two 4- hole locking miniplate applied at the superior and inferior borders and one 4-hole locking miniplate applied in neutral zone. The samples was subjected to linear vertical loading in the canine region in an mechanical testing unit Instron 4411 (Instron Corporation, Norwood, MA) and the peak load and load displacement in 3 mm, 5 mm and 7 mm were recorded. Averages and standard deviations were evaluated by applying the analysis of variance at a significance level of 5%.After mechanical testing, there was no statistically significant difference between the brands, both in group I and group II, in relation to the load supported in the displacement of 3 mm and 5 mm, or between peak loads. The only difference between the brands, for both groups, was the load in the displacement of 7 mm. In general, the plates Toride supported a greater load in both groups. The fracture surface examined under SEM indicated a ductile fracture, usually found in bodies testing of ductile materials such as titanium. Were not observed, in any fracture surface, any evidence of failure by altering the structure or composition of the material (AU)

• FAPESP's process: 11/05219-5 - Fractographic analysis by scanning electron microscopy (SEM) of 2.0mm titanium locking plate with simulated fracture in polyurethane hemi-mandible
• Grantee: Raquel Correia de Medeiros
• Support Opportunities: Scholarships in Brazil - Master