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*Oral Health Science Center, Department of Ultrastructural Science
**Oral Health Science Center, Laboratory of Radioisotopes
***Oral Health Science Center, The First Department of Oral and Maxillofacial Surgery
****Oral Health Science Center, Department of Partial Denture Prothodontics
The masseter muscle functions by attaching itself to the mandible. Thus, it is important to study the relationship between the masseter muscle and mandible to clarify the complex movement of the jaw. In this study, the chronological changes in the attachment site of the masseter muscle to the mandible following injury were observed in rats. These findings suggest that in order for the masseter muscle to recover after injury, the tendinous fibers must be repaired so that the entire muscle can be protected and recover functionality to some degree.