External apical root resorption 6 months after initiation of orthodontic treatment: A randomized clinical trial comparing fixed appliances and orthodontic aligners

• 발행기관: 대한치과교정학회
• 저자명: Katia Cristina Toyokawa-Sperandio Ana Clá udia de Castro Ferreira Conti Thais Maria Freire Ferna
• 간행물 정보: 『The Korean Journal of Orthodontics』제51권 제5호, 329~336쪽, 전체 8쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 2021.09.30

영문 초록

Objective: To compare the magnitude of external apical root resorption (EARR) 6 months after starting orthodontic treatment using orthodontic aligners (OAs) and fixed appliances (FAs). Methods: This parallel randomized clinical trial included 40 patients randomized into two groups: OA group (n = 20, 160 incisors) and FA group (n = 20, 160 incisors). For evaluation of the tooth length, periapical radiographs and standardized linear measurements of the maxillary and mandibular incisors were acquired before (T0) and 6 months after treatment initiation (T1). EARR was calculated through the difference in length between the two time points (T1–T0). Statistical comparisons were performed by means of using t -tests, chi-squared test and covariance analysis (a = 5%). Results: Rounding of the root apex was observed in both groups; the resorption involved 2.88% of the root length, so 97.12% of the tooth length remained intact. Intragroup comparisons between the two time points revealed a significant difference, with (T1–T0) ranging from −0.52 to −0.88 mm in the FA group and from −0.52 to −0.85 mm in the OA group. In the intergroup comparisons, only tooth #21 presented a statistically significant difference (OA: −0.52 ± 0.57 mm, FA: −0.86 ± 0.60 mm); however, the overall differences between groups were not clinically relevant, ranging from 0.03 to 0.35 mm. Conclusions: OA and FA treatment resulted in a similar degree of EARR in the maxillary and mandibular incisors at 6 months after treatment initiation. However, the amount of resorption was small and does not impair tooth longevity.

목차

INTRODUCTION

MATERIALS AND METHODS

RESULTS

DISCUSSION

CONCLUSION

CONFLICTS OF INTEREST

키워드

Orthodontics Root resorption Clear aligner Fixed appliance