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Effect of labiolingual inclination of a maxillary central incisor and surrounding alveolar bone loss on periodontal stress: A finite element analysis.

 Sung-Hwan Choi  ;  Young-Hoon Kim  ;  Kee-Joon Lee  ;  Chung-Ju Hwang 
 KOREAN JOURNAL OF ORTHODONTICS, Vol.46(3) : 155-162, 2016 
Journal Title
Issue Date
Alveolar bone loss ; Controlled tipping ; Labial tooth inclination ; Periodontal stress
OBJECTIVE: The aim of this study was to investigate whether labial tooth inclination and alveolar bone loss affect the moment per unit of force (Mt/F) in controlled tipping and consequent stresses on the periodontal ligament (PDL).
METHODS: Three-dimensional models (n = 20) of maxillary central incisors were created with different labial inclinations (5°, 10°, 15°, and 20°) and different amounts of alveolar bone loss (0, 2, 4, and 6 mm). The Mt/F necessary for controlled tipping (Mt/Fcont) and the principal stresses on the PDL were calculated for each model separately in a finite element analysis.
RESULTS: As labial inclination increased, Mt/Fcont and the length of the moment arm decreased. In contrast, increased alveolar bone loss caused increases in Mt/Fcont and the length of the moment arm. When Mt/F was near Mt/Fcont, increases in Mt/F caused compressive stresses to move from a predominantly labial apical region to a palatal apical position, and tensile stresses in the labial area moved from a cervical position to a mid-root position. Although controlled tipping was applied to the incisors, increases in alveolar bone loss and labial tooth inclination caused increases in maximum compressive and tensile stresses at the root apices.
CONCLUSIONS: Increases in alveolar bone loss and labial tooth inclination caused increases in stresses that might cause root resorption at the root apex, despite the application of controlled tipping to the incisors.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Young Hoon(김영훈)
Lee, Kee Joon(이기준) ORCID logo https://orcid.org/0000-0002-0782-3128
Choi, Sung Hwan(최성환) ORCID logo https://orcid.org/0000-0002-1150-0268
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
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