Mechanical evaluation of the use of conventional and locking miniplate/screw systems used in sagittal split ramus osteotomy

• 발행기관: 대한구강악안면외과학회
• 저자명: Zarina Tatia Barbosa Vieira Santos Douglas Rangel Goulart Eder Alberto Sigua Rodriguez Leandro Pozzer Sergio Olate José Ricardo Albergaria Barbosa
• 간행물 정보: 『대한구강악안면외과학회지』대한구강악안면외과학회지 제43권 제2호, 77~82쪽, 전체 6쪽
• 주제분류: 의약학 > 내과학
• 파일형태: PDF
• 발행일자: 2017.04.30

영문 초록

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.

목차

Abstract

I. Introduction

II. Materials and Methods

III. Results

IV. Discussion

V. Conclusion

References

키워드

Sagittal split ramus osteotomy Jaw fixation techniques Orthognathic surgery