An in vitro comparison study of the use of a drill or a saw in the Hunsuck- Dal Pont modification of the Obwegeser sagittal split osteotomy in pig mandibles.

Publication date: Available online 17 April 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Roland Böckmann, Klaus Neuking, Peter Kessler
PurposeFracture lines in unfavorable locations are referred to as "bad splits" in a mandibular sagittal split osteotomy (SSO). Several modifications of the technique by Obwegeser have been introduced to minimize this risk. This in-vitro study was performed to determine whether the shape of the osteotomy cut affects the torque and the fracture pattern of an SSO in pig mandibles.Material and MethodsIn a split-mouth model, 16 mandibles were split according to the Hunsuck- Dal Pont modification of the Obwegeser technique. Using an oscillating saw, sharp-edged osteotomies were created on one side of the mandible, and round-edged osteotomies were created on the contralateral side using a Lindemann bur. Torque forces were measured during the splitting, and the lingual fracture pattern of each split was classified.ResultsTorque forces were significantly (paired t-test, p<0.05) decreased by 0.77 Nm (15.6%) if a saw was used for the osteotomy. In both groups, fractures were produced along the mandibular canal. The mandible was more often completely fractured, including the lower mandibular border, if the fracture was created with an oscillating saw (Pearson's χ2-test, p=0.06). No correlation was demonstrated between the torque used and the fracture pattern.DiscussionCompared to round-edged osteotomies, sharp-edged osteotomies in pig mandibles facilitated the Hunsuck-Dal Pont modification of Obwegeser's sagittal splitting procedure and produced predictable results with reduced torque.



http://ift.tt/2oLbFoe