Abstract
Five adult dogs were used in this experiment to investigate the usefullness of root tips of the tooth for bone replacement materials and the effect of the GBR technique.
The experimental methods filling of blood clot and filling of root tips of the tooth. In each method, three dogs were treated by the GBR technique and two dogs without membranes as controls.Tissue specimens were taken 1,3 and 5 weeks after operations for observation under the light microscope.
1. In the case of filling of only blood clot, osseous healing was finished 5 weeks after operation,but the top of the socket was kept thick by GBR technique for a long time.
2. In the case of filling of root tips of the tooth,osseous addition occured one week after operation by tips with Sharpey's fibers, and it was found that bone gradually replaced the root tips of the tooth. In the case treated by GBR technique as well as the case of filling of only blood clot, osseous addition and thickness of the alveolar ridge at the top of the socket were observed 5 weeks after operation.
3. The root tips of tooth are useful as bone replacement material and should be used with Sharpey's fibers. The combined use of root tips and GBR technique was recommended according to the formation of a firm alveolar ridge by the GBR technique.
