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. 2024 Feb;27(1):55-63.
doi: 10.1111/ocr.12684. Epub 2023 Jun 14.

Alveolar bone morphology in patients with palatally-displaced maxillary lateral incisors before and after orthodontic treatment: A cone-beam computed tomography study

Yao Tang  1   2 , Wenhsuan Lu  1   2 , Weiqiang Wu  1   2 , Qiannan Sun  1   2 , Yunfan Zhang  1   2 , Tianmin Xu  1   2 , Si Chen  1   2 , Wei Liang  1   2 , Bing Han  1   2
Affiliations

Alveolar bone morphology in patients with palatally-displaced maxillary lateral incisors before and after orthodontic treatment: A cone-beam computed tomography study

Yao Tang et al. Orthod Craniofac Res. 2024 Feb.

Abstract

Introduction: Palatal displacement of maxillary anterior teeth is common in clinical practice. Previous studies have reported that the labial bone around palatally-displaced incisors is thinner than that around normally-placed teeth. Therefore, it is necessary to elucidate alveolar bone changes after alignment to guide orthodontic treatment. In this study, we investigated the alveolar bone changes around palatally-displaced maxillary lateral incisors before and after treatment, and the effects of extraction and age using cone-beam computed tomography.

Methods: In this retrospective study, 55 patients with unilateral palatally-displaced maxillary lateral incisors were included. Three-dimensional alveolar bone changes were measured at three levels (25%, 50% and 75% of the root length) using cone-beam computed tomography. Group comparisons were made between displaced and control teeth, extraction and non-extraction groups, and adult and minor groups.

Results: After orthodontic treatment, labiopalatal and palatal alveolar bone widths decreased at all measured levels. Labial alveolar bone width increased significantly at P25, but decreased at P75. Concavity decreased, while tooth-axis angle, tooth length, B-CEJ and P-CEJ increased. Changes in LB and LP at P75, B-CEJ and P-CEJ were statistically significant. After treatment, the tooth-axis angle on the PD side increased by 9.46°. The change in tooth-axis angle on the PD side was significantly smaller, and LB and LP decreased more at P75, in the extraction group.

Conclusions: Compared to the control teeth, alveolar bone thickness and height for the displaced teeth decreased more significantly after treatment. Tooth extraction and age also influenced alveolar bone changes.

Keywords: alveolar bone morphology; cone-beam computed tomography (CBCT); displaced tooth; orthodontic treatment.

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References

REFERENCES

    1. Chen Q, Mai ZH, Lu HF, Chen L, Chen Z, Ai H. Treatment of a mandibular functional shift in an adolescent boy with temporomandibular disorder and crossbites. Am J Orthod Dentofacial Orthop. 2015;148(4):660-673.
    1. Morad G, Behnia H, Motamedian SR, et al. Thickness of labial alveolar bone overlying healthy maxillary and mandibular anterior teeth. J Craniofac Surg. 2014;25(6):1985-1991.
    1. Okuzawa-Iwasaki M, Ishida Y, Ikeda Y, et al. Alveolar bone morphology in patients with a unilateral palatally displaced maxillary lateral incisor: a cone-beam computed tomography study. Am J Orthod Dentofacial Orthop. 2020;158(1):28-34.
    1. Kapila S, Conley RS, Harrell WE Jr. The current status of cone beam computed tomography imaging in orthodontics. Dentomaxillofac Radiol. 2011;40(1):24-34.
    1. Timock AM, Cook V, McDonald T, et al. Accuracy and reliability of buccal bone height and thickness measurements from cone-beam computed tomography imaging. Am J Orthod Dentofacial Orthop. 2011;140(5):734-744.

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