骨皮质切开术辅助上切牙内收后对牙根及牙槽骨影响的锥形束CT研究

Abstract

Abstract: Objective To investigate the effect of corticotomy-assisted en masse retraction on root length ,alveolar bone thickness and alveolar bone height in the anterior area . Methods Twenty patients who needed two maxillary first premolars extracted due to skeletal class II malocclusion were recruited and assigned to the corticotomy group（n=10） or the control group(n=10). All CBCT scans were performed before and after treatment and three-dimensional reconstruction was carried out .The root length , alveolar bone thickness and alveolar bone loss height of the upper incisor region were measured . Results The treatment time in corticotomy group were shorter than that in the control group and the differences were significant(P<0.．05)．There is no significant difference on the maxillary incisor root resorption between the corticotomy group and the control group (P ＞0.05).The increase in labial alveolar bone thickness at midroot level and apical level for the upper central and lateral incisors of corticotomy group were significantly greater than those of control group (P < 0.05). The amount of palatal alveolar bone loss for the upper central incisors in the corticotomy group was greater than that in the control group(P < 0.05).Conclusion Corticotomy-assisted en masse incisor retraction with bone material can increase alveolar bone thickness at the incisor site,but cannot reduce the amount of root resorption and damage the palatal alveolar bone height.

Key words: [Key words] corticotomy, upper anterior retraction , root resorption, alveolar bone

CLC Number:

R783.5

References 19

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Cone-beam CT analysis on the effects of corticotomy-assisted en masse retraction on root and alveolar bone

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