The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment

Moon Bee Oh, Sung Seo Mo, Chung Ju Hwang, Chooryung Chung, Ju Man Kang, Kee Joon Lee

Research output: Contribution to journalArticle

Abstract

Introduction: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. Methods: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. Results: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. Conclusions: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.

Original languageEnglish
Pages (from-to)365-374
Number of pages10
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Volume156
Issue number3
DOIs
Publication statusPublished - 2019 Sep

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Tooth
Bicuspid
Periodontal Ligament
Finite Element Analysis
Bone and Bones

All Science Journal Classification (ASJC) codes

  • Orthodontics

Cite this

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title = "The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment",
abstract = "Introduction: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. Methods: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. Results: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. Conclusions: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.",
author = "Oh, {Moon Bee} and Mo, {Sung Seo} and Hwang, {Chung Ju} and Chooryung Chung and Kang, {Ju Man} and Lee, {Kee Joon}",
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The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment. / Oh, Moon Bee; Mo, Sung Seo; Hwang, Chung Ju; Chung, Chooryung; Kang, Ju Man; Lee, Kee Joon.

In: American Journal of Orthodontics and Dentofacial Orthopedics, Vol. 156, No. 3, 09.2019, p. 365-374.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment

AU - Oh, Moon Bee

AU - Mo, Sung Seo

AU - Hwang, Chung Ju

AU - Chung, Chooryung

AU - Kang, Ju Man

AU - Lee, Kee Joon

PY - 2019/9

Y1 - 2019/9

N2 - Introduction: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. Methods: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. Results: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. Conclusions: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.

AB - Introduction: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. Methods: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. Results: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. Conclusions: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.

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