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Prediction of mandibular movement and its center of rotation for nonsurgical correction of anterior open bite via maxillary molar intrusion

Authors
 Kyunam Kim  ;  Kwangchul Choy  ;  Young-Chel Park  ;  Seo Yeon Han  ;  Heekyu Jung  ;  Yoon Jeong Choi 
Citation
 Angle Orthodontist, Vol.88(5) : 538-544, 2018 
Journal Title
 Angle Orthodontist 
ISSN
 0003-3219 
Issue Date
2018
Keywords
Anterior open bite ; Center of rotation ; Molar intrusion
Abstract
OBJECTIVES: To evaluate quantitatively the relationship between molar intrusion (change [Δ] maxillary first molar [U6]-palatal plane [PP]) and changes in vertical and sagittal cephalometric parameters and to determine the center of mandibular autorotation. MATERIALS AND METHODS: Twenty-one patients diagnosed with anterior open bite and successfully treated with molar intrusion (overbite [OB] > 0 mm) were retrospectively enrolled. Lateral cephalograms taken before and after molar intrusion were used to measure changes in vertical and sagittal cephalometric parameters. The center of mandibular autorotation was calculated by measuring displacement of gonion (Go) and pogonion (Pog). Paired t-tests were used to compare variables, and linear regression analysis was used to examine the relationship between ΔU6-PP and other variables. RESULTS: The mandible exhibited counterclockwise rotation after maxillary molar intrusion, which led to closure of anterior open bite. Strong linear relationships, in descending order, between ΔU6-PP and ΔOB, Δanterior facial height (AFH), Δvertical reference plane (Pog), and Δsella-nasion to Go-menton (SN-GoMe), were observed. When the maxillary molar was intruded 1 mm, OB increased by 2.6 mm, AFH decreased by 1.7 mm, Pog moved forward by 2.3 mm, and SN-GoMe decreased by 2°. The center of mandibular autorotation was located 7.4 mm behind and 16.9 mm below condylion after molar intrusion. CONCLUSIONS: The mandible exhibited counterclockwise rotation after maxillary molar intrusion; the center of mandibular autorotation was located behind and below condylion with individual variations.
Full Text
http://www.angle.org/doi/10.2319/102317-714.1
DOI
10.2319/102317-714.1
Appears in Collections:
1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실)
Yonsei Authors
박영철(Park, Young Chel)
정희규(Jung, Heekyu) ORCID logo https://orcid.org/0000-0002-0385-2095
최윤정(Choi, Yoon Jeong) ORCID logo https://orcid.org/0000-0003-0781-8836
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/166688
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