Effect of different adduction methods of maxillary incisor in adolescents on the shape of alveolar bone

doi:10.19439/j.sjos.2022.03.013

Abstract

Abstract: PURPOSE: To explore the influence of different adduction methods of maxillary incisor in adolescents on the shape of alveolar bone. METHODS: Three hundred and twenty-eight maxillary incisors were collected from 82 patients with jaw protrusion deformity treated in Union Hospital of Fujian Medical University from June 2018 to June 2019. 135 incisors were included in the oblique adduction group, and 193 incisors were included in the root control adduction group. All patients took cone-beam CT(CBCT) to measure the adduction of the maxillary incisor and the changes in alveolar bone height, thickness, and bone density. Statistical analysis was performed with SPSS 18.0 software package. RESULTS: The length of the maxillary incisor to the mid-palatine vertical surface(IE-MP), the long axis of the maxillary incisor and the posterior inferior angle of the palatal plane (LAI-PP) in oblique adduction group were significantly greater than root control adduction group(P<0.05). The length of the maxillary incisor from the apex of the maxillary incisor to the mid-palatine vertical surface(RA-MP) in the oblique adduction group was significantly smaller than the root control adduction group (P<0.05). Postoperative L1, L2, L3, P1, T1 of the oblique adduction group were significantly lower than preoperative values(P<0.05), and postoperative P2, P3, T2, and T3 were significantly higher than preoperative value(P<0.05). Postoperative L1, L2, and L3 of the root control adduction group were significantly higher than those before operation (P<0.05), and postoperative P1, P2, P3, T1, T2, and T3 were significantly lower than those before operation(P<0.05). The changes of L2, L3, P3, T3 of the oblique adduction group were significantly higher than the control root adduction group(P<0.05), and the changes of L1, P1, P2, T1, T2 of the oblique adduction group were all significantly lower than the control root adduction group(P<0.05). There was no significant difference in bone mineral density of the upper and lower jaws between the two groups before and 6 months after operation(P>0.05). CONCLUSIONS: When adolescents' maxillary incisors are retracted in a wide range, the labial apical area, the palatal alveolar ridge area of the oblique adduction group, and the palatal root neck of the root control adduction group are all high-risk areas for alveolar bone resorption.

Key words: Adolescents, Maxillary incisors, Root control adduction, Oblique adduction, Alveolar bone morphology

CLC Number:

R783.5

XIE Qin, LIN Shan, LIN Li, LI Duo. Effect of different adduction methods of maxillary incisor in adolescents on the shape of alveolar bone[J]. Shanghai Journal of Stomatology, 2022, 31(3): 290-294.

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