Analysis of Mandibular Test Specimens Used to Assess a Bone Fixation System.
The aim of this study was to assess through biomechanical testing if different synthetic materials used to fabricate test specimens have a different biomechanical behavior in comparison with other materials when simulating in vitro load resistance of a fixation method established for sagittal split ramus osteotomy (SSRO). Thirty synthetic and standardized human hemimandible replicas with SSRO were divided into three groups of 10 samples each. Group A-ABS plastic; Group B-polyamide; and Group C-polyurethane. These were fixated with three bicortical position screws (16 mm in length, 2.0-mm system) in an inverted l pattern using perforation guide and 5-mm advancement. Each sample was submitted to linear vertical load, and load strength values were recorded at 1, 3, 5, 7, and 10 mm of displacement. The means and standard deviation were compared using the analysis of variance (p < 0.05) and the Tukey test. A tendency for lower values was observed in Group B in comparison with Groups A and C. At 3 and 5 mm of displacement, a difference between Groups A and C was found in comparison with Group B (p < 0.05). At 7 and 10 mm of displacement, a difference was found among the three groups, in which Group C showed the highest values and Group B the lowest (p < 0.05). Taking into consideration the results obtained and the behavior of each material used as a substrate, significant differences occurred among the materials when compared among them.
Department of Surgery, School of Medical Sciences - Unicamp., Campinas, Sao Paulo, Brazil.
Leandro Stocco
LS
Baccarin
Department of Periodontics, Paulista University, Sao Paulo, Brazil.
Renato Correa Viana
RC
Casarin
3D Technology Department, Center for Information Technology Renato Archer, Campinas, Sao Paulo, Brazil.
Jorge Vicente
JV
Lopes-da-Silva
Department of Surgery, School of Medical Sciences, Unicamp, Campinas, Sao Paulo, Brazil ; Department of Surgery, Clinical Hospital-Unicamp, Campinas, Sao Paulo, Brazil.
Luis Augusto
LA
Passeri
biomechanics; mandibular advancement; osteotomy; sagittal split ramus osteotomy