OBJECTIVETo compare the canines root resorption and alveolar bone height when they were moved into different healing extraction sites.

METHODSTwenty patients with overjet were treated by extracting the maxillary first premolars. By random determination, distalization of different lateral upper canines started after 1 week and 12 weeks. Every 4 weeks use a force of approximately 100 g to distalize the canines. The experiment was ended when bilateral canines have contacted with the second maxillary bicuspids completely. Periapical radiography of the canine in the end of the distalization was made.

RESULTSExternal apical root resorption and alveolar bone height of the canines have no significant difference between the different healing extraction sites.

CONCLUSIONTooth extraction site healing has not much effect on the canine external apical root resorption and alveolar bone height, when it was distalization. In practice, tooth movement into extraction sites can start early.