Soraya da Silva Oliveira1, Pedro Henrique Mattos de Carvalho1, Cássio Edvard Sverzut1, Alexandre Elias Trivellato2. 1. School of Dentistry of Ribeirão Preto (FORP-USP), University of São Paulo, Avenida Do Café, S/NRibeirão Preto, São Paulo, 14040-904, Brazil. 2. School of Dentistry of Ribeirão Preto (FORP-USP), University of São Paulo, Avenida Do Café, S/NRibeirão Preto, São Paulo, 14040-904, Brazil. eliastrivellato@forp.usp.br.
Abstract
PURPOSE: This study compared the mechanical behavior of two fixation techniques used in three sections representing the sagittal split ramus osteotomy (SSRO) in polyurethane replicas that were divided into groups, according to type of section, and sub-groups according to type of fixation, simulating 11-mm advancement and 6º clockwise mandibular rotation. METHODS: Loads were applied in two regions, aiming at progressive application and consequent strength value, measured in kilogram-force in displacements of 1, 3, 5, and 7 mm, from the load application tip. Shapiro-Wilk test was performed, followed by two-way analysis of variance (ANOVA-2 way), and Bonferroni's multiple comparison. RESULTS: The results showed no statistically significant difference in the type of section and type of fixation used when load was applied to the inter-incisor region. However, when load was applied to the first molar region, statistically significant difference was observed in 1-mm displacement, in which section described by Epker with two modifications showed greater strength, regardless of type of fixation used (p = 0.007). CONCLUSION: In the application of load in the inter-incisor region, there was no statistical difference between the type of osteotomy and the type of fixation used. When applying loads to molars, there was a difference for the type of osteotomy, where the Epker osteotomy with 2 modifications presented greater resistance, regardless of the type of fixation used.
PURPOSE: This study compared the mechanical behavior of two fixation techniques used in three sections representing the sagittal split ramus osteotomy (SSRO) in polyurethane replicas that were divided into groups, according to type of section, and sub-groups according to type of fixation, simulating 11-mm advancement and 6º clockwise mandibular rotation. METHODS: Loads were applied in two regions, aiming at progressive application and consequent strength value, measured in kilogram-force in displacements of 1, 3, 5, and 7 mm, from the load application tip. Shapiro-Wilk test was performed, followed by two-way analysis of variance (ANOVA-2 way), and Bonferroni's multiple comparison. RESULTS: The results showed no statistically significant difference in the type of section and type of fixation used when load was applied to the inter-incisor region. However, when load was applied to the first molar region, statistically significant difference was observed in 1-mm displacement, in which section described by Epker with two modifications showed greater strength, regardless of type of fixation used (p = 0.007). CONCLUSION: In the application of load in the inter-incisor region, there was no statistical difference between the type of osteotomy and the type of fixation used. When applying loads to molars, there was a difference for the type of osteotomy, where the Epker osteotomy with 2 modifications presented greater resistance, regardless of the type of fixation used.
Authors: V A Pereira Filho; H Y Iamashita; M S Monnazzi; M F R Gabrielli; L G Vaz; L A Passeri Journal: Int J Oral Maxillofac Surg Date: 2012-08-13 Impact factor: 2.789
Authors: Pedro Henrique Mattos de Carvalho; Soraya da Silva Oliveira; Matheus Favaro; Cássio Edvard Sverzut; Alexandre Elias Trivellato Journal: Oral Maxillofac Surg Date: 2020-07-13