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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 
 American Journal of Orthodontics and Dentofacial Orthopedics, Vol.155(3) : 347-354, 2019 
Journal Title
 American Journal of Orthodontics and Dentofacial Orthopedics 
Issue Date
Adult ; Bone Screws* ; Dental Models ; Dental Occlusion ; Dental Stress Analysis ; Female ; Humans ; Male ; Orthodontic Anchorage Procedures* ; Retrospective Studies ; Tooth Migration/diagnosis* ; Tooth Movement Techniques*
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.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Ho(김경호) ORCID logo https://orcid.org/0000-0002-8154-2041
Jang, Woowon(장우원)
Chung, Chooryung J.(정주령) ORCID logo https://orcid.org/0000-0001-9399-7193
Choi, Yoon Jeong(최윤정) ORCID logo https://orcid.org/0000-0003-0781-8836
Hwang, Soon Shin(황순신) ORCID logo https://orcid.org/0000-0002-6472-4732
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