EFFECTS OF DRILL SPEED ON HEAT-PRODUCTION AND THE RATE AND QUALITY OFBONE-FORMATION IN DENTAL IMPLANT OSTEOTOMIES .2. RELATIONSHIP BETWEENDRILL SPEED AND HEALING

In Part I of this two-part study, the authors investigated heal produc tion during osteotomy drilling at three different speeds, and determin ed that high-speed drilling produced the least heat when using 700 XL carbide burs. Part II of the study histologically examines the rare an d quality of healing after drilling osteotomies at the three speeds in the mandible. Osteotomies were histologically examined 2, 4, and 6 we eks postoperatively. Histologic findings suggested that in the initial 6 weeks, the rate of healing and quality of new bone formation were h igher after high-speed drilling than after low-or intermediate-speed d rilling. These results, when considered with the results reported in P art I in which a 4.3 degrees C difference in heat production was obser ved between the speeds, seem to imply a relationship between heat prod uction and healing for osteotomy drilling.