ANDRADE, V. C.; LUTHI, L. F.; SATO, F. L.; NASCIMENTO, F. F.; OLATE, S. & ALBERGARIA-BARBOSA, J. R. Sagittal split ramus osteotomy with L inverted osteosynthesis. A Mechanical Study with Photoelasticity. Int. J. Odontostomat., 8(1):161-165, 2014.
ABSTRACT: The aim of this research was to analyzed the tension in osteosynthesis screw used for fixation of sagittal split ramus osteotomy (SSRS). Was used two model of SSRS made in photoelastic resin; in one of them was include a basilar osteotomy and the another one only SSRS without basilar osteotomy; for both system was used inverted L osteosynthesis with 13 mm screw of 2.0 system. Posteriorly, the hemimandible was installed in Instrom machine with a vertical load of 1 mm/min until the displacement of 3 mm; the load point was on first molar. The fringe distribution show more tension in the screw close to osteotomy in both groups; when SSRS was united to basilar osteotomy was produced a inferior distribution of force and in the SSRS without basilar osteotomy group was maintained a distribution into the oblique line. It’s was conclude that both mandibular osteotomies was efficient in load distribution and was not observed important differences between screw related to distribution of load.
KEY WORDS: sagittal ramus osteotomy, photoelastic analyses, biomechanics.