Effect of labiolingual inclination of a maxillary central incisor and surrounding alveolar bone loss on periodontal stress: A finite element analysis
최성환, 김영훈, 이기준, 황충주,
소속 상세정보
최성환 ( Choi Sung-Hwan ) - Yonsei University College of Dentistry Department of Orthodontics
김영훈 ( Kim Young-Hoon ) - Yonsei University College of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
황충주 ( Hwang Chung-Ju ) - Yonsei University College of Dentistry Department of Orthodontics
KMID : 0361920160460030155
Abstract
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 (5o, 10o, 15o, and 20o) 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.
키워드
Labial tooth inclination; Alveolar bone loss; Controlled tipping; Periodontal stress
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