Effect of Carbonate Apatite with Low-Intensity Pulsed Ultrasound Irradiation in Bone Cavity

Abstract

Objective : The objective of the present study was to evaluate histomorphometrically, in adult dogs, the effect of sintering carbonate apatite (500 CA or 700 CA) at 500℃ or 700℃, with or without low-intensity pulsed ultrasound (LIPUS) irradiation at 3 MHz (exposed for 15 min every day) for 7 days in a bone cavity.
Material and Methods : After three months of bone healing after tooth extraction, six bone cavities were created in parts P1, P2, P3 and M1 of ten adult dogs. Six experimental conditions were established : G1 : control (β-TCP) ; G2 : β-TCP+LIPUS ; G3 : 500 CA, G4 : 500 CA+LIPUS, G5 : 700CA and G6 : 700 CA+LIPUS. After 14 or 28 days, the dogs were euthanized. Their lower jaws were removed, fixed, stained by Villanueva Goldner-stain, dehydrated and embedded in MMA resin. Semi-serial sections were obtained and examined with light microscopy.
Results : Histomorphometric analyses of the bone cavity grafted into Ti-mesh tubes with G4 revealed 5.72% (mean) new vital bone at two weeks. LIPUS significantly increased new bone formation with 500 CA, although it did not affect the resorption of the materials except 700 CA(G6). At four weeks, however, no significant influences were observed ; G4 was as effective as β-TCP in terms of new bone formation.
Conclusion : The results of the present study suggest that 500 CA graft material and LIPUS irradiation present additional advantages in new bone formation at two weeks in bone cavities in the lower jaws of adult dogs.