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논문 기본 정보

자료유형
학술저널
저자정보
Katia Cristina Toyokawa-Sperandio (University of North Parana (UNOPAR)) Ana Cláudia de Castro Ferreira Conti (University of North Parana (UNOPAR)) Thais Maria Freire Fernandes (University of North Parana (UNOPAR)) Renata Rodrigues de Almeida-Pedrin (University of North Parana (UNOPAR)) Marcio Rodrigues de Almeida (University of North Parana (UNOPAR)) Paula Vanessa Pedron Oltramari (University of North Parana (UNOPAR))
저널정보
대한치과교정학회 대한치과교정학회지 대한치과교정학회지 제51권 제5호
발행연도
2021.9
수록면
329 - 336 (8page)

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초록· 키워드

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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
REFERENCES

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