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Journal of Dental Research
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Biological

Effects of Ultrasound Modes on Mandibular Osteodistraction

T.H. El-Bialy1,*, R.F. Elgazzar2, E.E. Megahed3 and T.J. Royston4

1 Orthodontics and Biomedical Engineering, Faculty of Medicine and Dentistry, University of Alberta, Dentistry/ Pharmacy Centre, Room 4051, Edmonton, AB, Canada T6G 2N8, formerly Lecturer of Orthodontics, Tanta University, Egypt;
2 Oral and Maxillofacial Surgery/Dental Diagnostic and Surgical Sciences, Faculty of Dentistry, University of Manitoba, Canada, and Faculty of Dentistry, Tanta University, Egypt;
3 Oral Pathology, Tanta University, Egypt; and
4 Mechanical Engineering, University of Illinois at Chicago, USA

Correspondence: * corresponding author, telbialy{at}ualberta.ca

Previous studies have shown that therapeutic pulsed ultrasound (pulsed) has superior stimulatory effect on bone fracture healing compared with continuous ultrasound (continuous). Our predictive hypothesis was that pulsed ultrasound can produce better bone formation during mandibular osteodistraction than continuous ultrasound. Thirty-six New Zealand rabbits were divided into 3 groups of 12. Osteodistraction was performed at 3 mm/day for 5 days. Group 1 received pulsed, group 2 received continuous ultrasound, and group 3 was the control group (distraction only). Bone formation was assessed by quantitative bone density (QBD), mechanical testing, and histological examination. In the first 2 wks post-distraction, group 2 showed enhanced bone formation more than group 1 (p < 0.05); however, in the 3rd and 4th wks, group 1 showed more bone formation than group 2 (p < 0.05). Earlier stages of bone healing were enhanced more by continuous, whereas late stages were enhanced more by pulsed, ultrasound. Abbreviations: PULSED, low-intensity pulsed ultrasound; CONTINUOUS, low-intensity continuous ultrasound.

Key Words: mandibular bone healing • bone formation • distraction osteogenesis • therapeutic ultrasound

Journal of Dental Research, Vol. 87, No. 10, 953-957 (2008)
DOI: 10.1177/154405910808701018
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