A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage
강주만, 박재현, Bayome Mohamed, 오문비, Park Chong-Ook, 국윤아, 모성서,
소속 상세정보
강주만 ( Kang Ju-Man ) - Catholic University Graduate School Department of Dentistry
박재현 ( Park Jae-Hyun ) - Kyung Hee University Graduate School of Dentistry
( Bayome Mohamed ) - Catholic University Graduate School Department of Dentistry
오문비 ( Oh Moon-Bee ) - Catholic University College of Medicine Department of Orthodontics
( Park Chong-Ook ) - Private practice
국윤아 ( Kook Yoon-Ah ) - Catholic University College of Medicine Department of Orthodontics
모성서 ( Mo Sung-Seo ) - Catholic University Graduate School of Clinical Dental Science Department of Orthodontics
KMID : 0361920160460050290
Abstract
Objective: This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis.
Methods: Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear.
Results: An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances.
Conclusions: The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.[Korean J Orthod 2016;46(5):290-300]
키워드
Distalizing; Headgear; Class II; Palatal plate
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