P.345 Complex treatment of osteoradionecrosis under acupuncture

Abstract

This study concerns intraosseous temperature changes during the use of piezosurgical inserts. On six fresh pig jaws heated to body temperature (36 °C), osteotomies and osteoplasties were performed in vitro with the Piezosurgery® 3 device (Mectron, Carasco, Italy) and various inserts. The intraosseous temperature increases were measured at a depth of 3 mm and at a distance of 1 mm from the working site using nickel–chromium/nickel temperature sensors. 20 °C Ringer's solution was used for cooling in an initial test series and 10 °C Ringer's in a second series. The processed bone was examined using digital volume tomography images to determine the ratio of cortical to cancellous bone thickness. Mean temperature increases of 4.4–10.9 °C were found; maximum temperature peaks were over 47 °C for an average of only 8.5 s. The type of piezosurgical insert had a marked influence on intraosseous temperature generation (p = 0.026); the thickness of the cortical bone and the temperature of the coolant did not. Coolant temperature had an influence on the bone cooling time (p = 0.013). The results show that correct use of the piezosurgery device does not give rise to prolonged temperature increases over 47 °C and hence does not cause any irreversible thermal damage in the bone.