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Effects of low intensity pulsed ultrasound stimulation on bone regeneration in rat parietal bone defect model

DOI: 10.4236/ojrm.2013.21002    3,700 Downloads   8,804 Views   Citations

ABSTRACT

Purpose: Low intensity pulsed ultrasound stimulation (LIPUS) has been clinically applied to promote bone fracture healing in the orthopedic field. Thus, it is likely that LIPUS also stimulates bone regeneration in bone defects in the cranial-maxillofacial area. However, this has not been clearly proved. Furthermore, optimal time point and period of the application after the surgery has not been reported. The purpose of the present study was to evaluate the effect of LIPUS on bone regeneration in the rat parietal bone defects especially focusing on time and period of the application. Materials and Methods: Eighteen Wistar rats (14 weeks old) were divided into 6 groups: 5 experimental groups and a control group. Bone defect of 5 mm diameter was prepared on each side of the parietal bone and customized gelatin membranes were placed over the bone defects. LIPUS (160 mW/cm2, 15 min/day) was applied to the defect area with an active transducer externally in the experimental groups according to the schedules of the applications: Group 1 (day 6 - 12), group 2 (day 13 - 19), group 3 (day 20 - 26), group 4 (day 6 - 19) and group 5 (day 6 - 26). All the animals were sacrificed at 28 days. The defects were analyzed with micro CT and then histologically. Results: In Group 1, new bone formation was significantly promoted and the newly-formed bone was thick and matured compared to the one of the control group. In other experimental groups there were tendencies of stimulation of new bone formation; however, they were not statistically significant. Discussion and Conclusion: The present study demonstrated that amount of new bone formation in the bone defect depended on the time and period of LIPUS application. It has been suggested that application of LIPUS at an early healing period, the second week after the surgery, effectively accelerated new bone formation.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Chen, K., Hao, J., Noritake, K., Yamashita, Y., Kuroda, S. and Kasugai, S. (2013) Effects of low intensity pulsed ultrasound stimulation on bone regeneration in rat parietal bone defect model. Open Journal of Regenerative Medicine, 2, 8-14. doi: 10.4236/ojrm.2013.21002.

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