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KMID : 0354619950070010065
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Journal Dankook Dental Research Institute
1995 Volume.7 No. 1 p.65 ~ p.72
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A study on the pattern of the root resorption following maxillary incisor retraction
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Cha Kyung-Suk
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Abstract
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This study was carried out in order to find out the pattern of the root resorption following maxillary incisor retraction after maxillary first bicuspid extration in maxillary protrusion patients.
For this study,thirty ruro patient who received orthodontic treatment were chosen.The results were as follows;
1. Of the total 192 teeth, 61 teeth (31.77%) showed no apical root loss, 64 teeth (33.33%) fell into the class "slight", 46 teeth (23.96%) fell into the class "moderate". Only 21 teeth(10.94%) were classified as "excessive".
2. No correlation was noted between the amount of apical root loss and the types of tooth movement of the maxillary central incisors.
3. The patients who were treatsB with standard brackets had more changs in tooth axis and less movement of root apexes, but the patients with straight brackets had tess changs in tooth axis and more movement of root apexes.
4. Comparing the degree of root resorption between bracket types,patients who had used standard bracket showed more apical root loss than patients who had used straight brackets.
5. The most frequent degree of root resorption obsrrved in standard bracket patients was second degree,followed by first degree and third degree.The most frequent degree of root resorption observed in straight Patients was fuo degree, followed by first, second degree and third degree.
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