Mechanical evaluation of the use of conventional and locking miniplate/ screw systems used in sagittal split ramus osteotomy
Santos Zarina Tatia Barbosa Vieira, Goulart Douglas Rangel, Eder Alberto Sigua Rodriguez, Pozzer Leandro, Olate Sergio, Jose Ricardo Albergaria Barbosa,
소속 상세정보
( Santos Zarina Tatia Barbosa Vieira ) - State University of Campinas Department of Oral and Maxillofacial Surgery
( Goulart Douglas Rangel ) - State University of Campinas Department of Oral and Maxillofacial Surgery
( Eder Alberto Sigua Rodriguez ) - State University of Campinas Department of Oral and Maxillofacial Surgery
( Pozzer Leandro ) - State University of Campinas Department of Oral and Maxillofacial Surgery
( Olate Sergio ) - Universidad de La Frontera Department of Oral and Maxillofacial Surgery
( Jose Ricardo Albergaria Barbosa ) - State University of Campinas Department of Oral and Maxillofacial Surgery
KMID : 0355620170430020077
Abstract
Objectives: The aim of this study was to compare the mechanical resistance of four different osteosyntheses modeled in two different sagittal split ramus osteotomy (SSRO) designs and to determine the linear loading in a universal testing machine.
Materials and Methods: An in vitro experiment was conducted with 40 polyurethane hemimandibles. The samples were divided into two groups based on osteotomy design; Group I, right angles between osteotomies and Group II, no right angles between osteotomies. In each group, the hemimandibles were distributed into four subgroups according to the osteosynthesis method, using one 4-hole 2.0 mm conventional or locking plate, with or without one bicortical screw with a length of 12.0 mm (hybrid technique). Each subgroup contained five samples and was subjected to a linear loading test in a universal testing machine.
Results: The peak load and peak displacement were compared for statistical significance using PASW Statistics 18.0 (IBM Co., USA). In general, there was no difference between the peak load and peak displacement related to osteotomy design. However, when the subgroups were compared, the osteotomy without right angles offered higher mechanical resistance when one conventional or locking 2.0 mm plate was used. One locking plate with one bicortical screw showed higher mechanical resistance (162.72±42.55 N), and these results were statistically significantly compared to one conventional plate with monocortical screws (P=0.016) and one locking plate with monocortical screws (P=0.012). The difference in peak displacement was not statistically significant based on osteotomy design or internal fixation system configuration.
Conclusion: The placement of one bicortical screw in the distal region promoted better stabilization of SSRO. The osteotomy design did not influence the mechanical behavior of SSRO when the hybrid technique was applied.
키워드
Sagittal split ramus osteotomy; Jaw fixation techniques; Orthognathic surgery
원문 및 링크아웃 정보
등재저널 정보