Anchorage loss assessment of the indirect anchor tooth during adjunctive orthodontic treatment

Woowon Jang, Yoon Jeong Choi, Soonshin Hwang, Chooryung J. Chung, Kyung Ho Kim

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Introduction: This study quantitatively assessed movement of anchor teeth connected to a miniscrew (indirect anchor tooth) and investigated factors affecting movement during adjunctive orthodontic treatment. Methods: Dental plaster models of 28 patients whose treatment included an indirect anchor tooth on one side were collected before and after treatment. The casts were digitally scanned, and 2 groups were constituted: the indirect anchor teeth (experimental group; n = 52) and the untreated teeth (control group; the first and second premolars opposing the indirect anchor tooth to which no orthodontic force was applied; n = 55). Pretreatment and posttreatment models were superimposed and the amount and direction of indirect anchor tooth movement were evaluated with the use of a univariate linear mixed model. Possible factors affecting movement of the indirect anchor tooth and its significance were also evaluated with the use of a multiple linear mixed model. Results: The indirect anchor tooth moved 0.91 ± 0.50 mm and did not exhibit significant differences in the transverse, vertical, or sagittal directions. The location of the indirect anchor tooth affected movement and the tooth moved significantly more in the mandible than in the maxilla. Conclusions: The indirect anchor tooth can move during adjunctive orthodontic treatment and thus requires careful monitoring for occlusal changes.

Original languageEnglish
Pages (from-to)347-354
Number of pages8
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Issue number3
Publication statusPublished - 2019 Mar

Bibliographical note

Publisher Copyright:
© 2018 American Association of Orthodontists

All Science Journal Classification (ASJC) codes

  • Orthodontics


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