Measurement of dynamic strain produced by experimental sagittal splitting osteotomy of human air-dried mandibular ramus.

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Simulative experiments of sagittal splitting osteotomy of the mandibular ramus were undertaken using dentate human air-dried mandibular bones. The distribution of dynamic strain was measured. The following results were obtained: (1) The absolute value of dynamic strain tended to be lower in sagittal splitting osteotomy by Obwegeser's technique than by the Obwegeser-Dal Pont method. (2) In sagittal splitting osteotomy by Obwegeser's technique the absolute value of dynamic strain directly beneath the mylohyoid neural groove was unrelated to the kind or application angle of the osteotome or other splitting instruments. (3) In sagittal splitting osteotomy by the Obwegeser-Dal Pont's technique, high dynamicstrain was recorded directly beneath the mylohyoid neural groove, except when osteotomy was carried out with a splitter inserted at a 60° angle. These findings suggest a risk of accidental fracture due to concentrated stress in this region occurring when the osteotome is not used properly. (4) These experiments suggested that sagittal splitting osteotomy of the mandible can be accomplished with a higher margin of safety by Obwegeser's technique than by the Obwegeser-Dal Pont's technique because of lower stress concentration with the former.
社団法人日本口腔外科学会の論文