- 作者：Raquel Correia de Medeiros ; DDS&lowast ; ; raquelcorreiademedeiros@gmail.com" class="auth_mail ; Andrezza Lauria de Moura ; DDS ; MsD&dagger ; ; Danillo Costa Rodrigues ; DDS&Dagger ; ; Marcelo Breno Menezes Mendes ; DDS§ ; ; Renato Sawazaki ; DDS ; MsD ; PhD鈥?/sup> ; Roger William Fernandes Moreira ; DDS ; MsD ; PhD¶ ;
- 刊名：Journal of Oral and Maxillofacial Surgery
- 出版年：June 2014
- 年：2014
- 卷：72
- 期：6
- 页码：1130-1137
- 全文大小：2077 K
Materials and Methods
Four aluminum hemimandibles with linear sectioning to simulate a mandibular body fracture were used as a substrate and fixed with 2 fixation techniques from 2 national brands: Tóride and Traumec. The techniques were as follows: one 4-hole plate, with four 6-mm screws in the tension zone, and one 4-hole plate, with four 10-mm screws in the compression zone; and one 4-hole plate, with four 6-mm holes in the neutral zone. The hemimandibles were submitted to vertical linear load tests using an Instron 4411 mechanical test machine. The system was submitted to the test until complete failure had occurred. Next, a topographic analysis of the surface of the plates was performed using a stereomicroscope and an electronic scanning microscope. The samples were evaluated using different magnifications, and images were obtained.
Results
The surface of the fracture analyzed in scanning electron microscopy demonstrated a ductile-type fracture, usually found in the traction test bodies of ductile materials, such as titanium. No evidence of failure was observed in any fracture surface from a change in the structure or composition of the material.
Conclusions
The plates were fractured by a ductile rupture mechanism, as expected, suggesting that the manufacturing of the national brand name plates used in the present study has been under adequate quality control, with no structural changes produced by the manufacturing process that could compromise their function.