Effects of Maxillary Sinus on Molar Distalization with Clear Aligners

doi:10.13701/j.cnki.kqyxyj.2024.11.006

Abstract

Abstract: Objective: To study the relationship between maxillary sinus and root position of molars using cone-beam computed tomography (CBCT) and examine whether it affects the efficiency and bodily movement rate of molar distalization with clear aligners. Methods: This prospective study included 13 patients who used clear aligner techniques to push 45 maxillary molars backward. There were 18 molars whose roots were embedded in the maxillary snus (embedded group) and 27 molars whose roots were not (non-embedded group). Before orthodontic treatment and after the upper molars were moved back into position, CBCT was taken. Mimics software was used to overlap the maxilla and establish three-dimensional coordinates based on the occlusal plane. Changes in the distance, axial inclination, and torque angle of the molar distalization were measured. Results: The clear aligner technique could effectively move the maxillary molars in a distal direction. The effective rate of crown distal movement in the embedded group was 86.35%, and in the non-embedded group was 79.24%. The overall effective rate of root distal migration in the embedded group was 59.48%, and in the non-embedded group was 76.46%. The distally tipping angle of the embedded group was 2.43°, and that of the non-embedded group was 3.51°. The buccal tipping angle of the embedded group was 4.29°, and that of the non-embedded group was 3.28°. There was no statistically significant between two groups. Conclusion: The different relationship between maxillary sinus and molar root position has no significant effect on the efficiency and bodily movement rate of maxillary molar distalization.

Key words: maxillary sinus, cone-beam computed tomography, clear aligner, molar distalization

HUANG Rongcai, ZHENG Quanyi, LONG Jinfeng, XIONG Guoping.. Effects of Maxillary Sinus on Molar Distalization with Clear Aligners[J]. Journal of Oral Science Research, 2024, 40(11): 972-977.

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