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Effect of Botulinum Toxin Type A on Mandibular Fracture Healing: An Experimental Study in Rabbits
Huseyin Can Tukel1, Yusuf Kenan Daglioglu2, Ufuk Tatli3
1Assistant Professor, Department of Oral and Maxillofacial Surgery, Cukurova University, Adana, Turkey.
Purpose:
The effect of botulinum toxin type A (BTX-A) on fracture healing of the long bones is controversial, and no controlled clinical or experimental study has investigated the effect of BTX-A on mandibular fractures. The purpose of this study was to investigate whether BTX-A injection into the masseter muscles affects bone healing by reducing the displacing forces in an unfavorable mandibular fracture model.
Materials And Methods:
Forty-eight male New Zealand white rabbits were used. Ten units of BTX-A was injected into each masseter muscle in the animals in the BTX-A group, whereas saline solution was injected in the animals in the control group. A unilateral osteotomy and fixation with a microplate were performed. Bone healing was evaluated by radiodensitometric, biomechanical, histologic, and histomorphometric methods after 21 days.
Results:
The mean bone mineral density in the fracture area was significantly higher in the BTX-A group (P = .038). The mean failure load and bending modulus values were significantly higher in the BTX-A group than in the control group (P = .032 and P = .005, respectively). The mean histologic bone healing scores, bone volume-total volume values, and trabecular diameter values were significantly higher in the BTX-A group than in the control group (P = .001, P = .001, and P = .026, respectively).
Conclusions:
BTX-A application into the masseter muscles improves bone healing of a unilateral mandibular fracture in rabbits.
