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The root resorption affected by the ameloblastoma, odontogenic cyst, fibrous dysplasia, ossifying fibroma and cementifying fibroma were observed.The degree of root resorption were classified by the characteristic of the clinical X-ray findings into 5 types.Type A: shows severe resorption with a saw-toothed root.Type B: shows severe resorption with a sharp-cut root.Type C: shows moderate resorption with the rough surface of the root.Type D: shows absence of lamina dura and loss of periodontal ligament space without root resorption.Type E: shows hypercementosis of the root.Roots of the extracted teeth involved in the lesions were observed morphologicaly and compared with clinical X-ray findings.Also, the surfaces of affected roots were observed with a scanning electron microscope.The results are concluded as follows.1. The incidence of the root resorption affected by the ameloblastoma, ossifying fibroma and cementifying fibroma were higher than that of the odontogenic cyst and fibrous dysplasia.2. The findings of scanning electron microscope showed various degrees of demineralization and remineralization in the lesions.3. In 71.2% of the extracted teeth having lesions, the characteristics of the root resorption were reviewed previously in clinical X-ray findings.The results may aid the clinician in the preoperative differential diagnosis.

Studies on the root resorption in the disease of the jaw.