AI Article Synopsis
- The study aimed to analyze changes in the masseter muscle after mandibular angle ostectomy in rabbits by measuring various indices.
- Significant decreases in muscle mass and muscle fiber areas were observed on the operated side, with alterations in fiber types, showing a reduction in type I fibers and an increase in type II fibers.
- While initial changes in sarcomere lengths were noted in the first four weeks post-surgery, these differences disappeared after eight weeks, indicating adaptation in the masseter muscle after the procedure.
Article Abstract
Objective: To study the changes of masseter muscle after reducing the mandibular by measuring some relative index after ostectomy of the mandibular angle along arch line.
Methods: Left mandibular angle ostectomy was performed on New Zealand female rabbits aged three months. The right was not operated as control groups. Five rabbits were examined at the following intervals: 2, 4, 8, 12 and 24 weeks.
Results: There were remarkable decreases in the experimented masseter muscle masses and the same type muscle fiber areas compared with the control group (P < 0.05). As for the fiber types, a decrease in type I fibers and an increase in type II fibers were noticed on operative side masseters (P <0.05). Sarcomere lengths in the operative side muscles were significantly reduced and showed statistical significance during first 4 weeks (P < 0.05), but there was no difference between the operative group and the control group after 8 weeks (P > 0.05).
Conclusions: The changes of masseter fibres show reconstruction of masseter muscle after mandibular angle ostectomy.
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