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A three-dimensional finite element analysis of molar distalization with a palatal plate, pendulum, and headgear according to molar eruption stage

  • Kang, Ju-Man (Department of Dentistry, Graduate School, The Catholic University of Korea) ;
  • Park, Jae Hyun (Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University) ;
  • Bayome, Mohamed (Department of Dentistry, Graduate School, The Catholic University of Korea) ;
  • Oh, Moonbee (Department of Orthodontics, St. Mary's Hospital, College of Medicine, The Catholic University of Korea) ;
  • Park, Chong Ook (Private Practice) ;
  • Kook, Yoon-Ah (Department of Orthodontics, St. Mary's Hospital, College of Medicine, The Catholic University of Korea) ;
  • Mo, Sung-Seo (Department of Orthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea)
  • Received : 2015.09.09
  • Accepted : 2016.02.16
  • Published : 2016.09.25

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.

Keywords

References

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