Evaluation of Root Resorption in Extraction Patients Treated with Clear Aligner

doi:10.13701/j.cnki.kqyxyj.2023.09.007

Abstract

Abstract: Objective: To investigate the root resorption of maxillary teeth in extraction patients treated with clear aligner using three-dimensional reconstructed cone beam computed tomography (CBCT). Methods: One hundred and fifty teeth from 15 Class Ⅱ extraction treatment patients were selected. CBCT images were obtained at pretreatment (T0) and posttreatment (T1). Root volume and root surface area(RSA)were calculated by three-dimensional reconstruction of CBCT images. Results: The root volume was significantly decreased in all patients (P<0.001), and 98% of the measured teeth showed mild to moderate root resorption. There was no significant difference in the severity of root resorption between anterior and posterior teeth (P>0.05). The RSA was significantly decreased in all patients (P<0.001). There was no significant difference in RSA between anterior and posterior teeth (P>0.05). The incidence of moderate and severe root resorption in incisors and first molars was 23.33%-26.67%. Conclusion: During clear aligner therapy for Class Ⅱ extraction treatment patients, mild to moderate root resorption occurred in most of the measured teeth, and no statistical difference in the changes of volume and surface area of anterior and posterior teeth, suggesting that orthodontists should pay attention to the risk of root resorptions not only in the anterior teeth but also in the posterior teeth.

Key words: clear aligners, root resorption, cone beam computed tomography, extraction treatment, root surface area

ZHOU Lianggui, LIANG Ying, PENG Juxiang, GAO Juan, LI Qi, ZHENG Zhijun. Evaluation of Root Resorption in Extraction Patients Treated with Clear Aligner[J]. Journal of Oral Science Research, 2023, 39(9): 798-803.

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