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Stimulation of rabbit condyle growth by using pulsed therapeutic ultrasound (A radiographical and histological experimental study)

Authors: Mustafa A.Qaisi مصطفى القيسي --- Nidhal H. Ghaib نضال حسين غايب
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 2 Pages: 137-143
Publisher: Baghdad University جامعة بغداد

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Abstract

Backgrounds: Many difficulties faced the orthodontic clinician during treatment of class II malocclusion cases in thepreadolescence period in which treatment is done by growth modification of condyle , these difficulties are due tothe poor cooperation of the patients with the myofunctional appliances. The present research was carried out toevaluate the effect of Low Intensity Pulsed Ultrasound application on mandibular condyle of rabbit radiographicallyand histologically to evaluate the use of low intensity pulsed ultrasound in condyle growth modification in thetreatment of skeletal class II malocclusions in the growth period.Materials and Methods: The sample was 15 New Zealand male rabbits in which Therapeutic Ultrasound was appliedto the left condyle (treated group) for 28 days while the right condyle was without ultrasound application (controlledgroup), After animal sacrifying , the rabbit mandibles were dissected into two hemi mandible, left (treated) andright (control), radiographic image for each hemi mandible was done and three linear measurements were made,(Ramus height, condylar height and mandibular height). Then these hemi mandibles examined histologicallyincluding calculating chondrocyte number, osteocyte number, cartilage area calculation and subchondral bonearea measurements.Results: the results showed: The increasing of all linear measurements as a result of enhancement of chondrocytes,osteocytes, increase of cartilage area and bone area in the treated group. There is significant correlation betweenall linear measurements and chondrocyte and cartilage area.Conclusion: low intensity pulsed ultrasound can accelerate condyle cartilage growth

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