Comparison of treatment effects between four premolar extraction and total arch distalization using the modified C-palatal plate
Jo Sung-Youn, Bayome Mohamed, Park Justyn, 임희진, 국윤아, 한성호,
소속 상세정보
( Jo Sung-Youn ) - Private practice
( Bayome Mohamed ) - Catholic University College of Medicine Department of Dentistry
( Park Justyn ) - University California San Francisco School of Dentistry
임희진 ( Lim Hee-Jin ) - Catholic University College of Medicine Seoul St. Mary’s Hospital Department of Orthodontics
국윤아 ( Kook Yoon-Ah ) - Catholic University College of Medicine Seoul St. Mary’s Hospital Department of Orthodontics
한성호 ( Han Seong-Ho ) - Catholic University St. Vincent’s Hospital Department of Dentistry
Abstract
Objective: The purpose of this study was to compare the skeletal, dental, and soft-tissue treatment effects of nonextraction therapy using the modified C-palatal plate (MCPP) to those of premolar extraction (PE) treatment in adult patients with Class II malocclusion.
Methods: Pretreatment and posttreatment lateral cephalographs of 40 adult patients with Class II malocclusion were retrospectively analyzed. The MCPP group comprised 20 patients treated with total arch distalization of the maxillary arch while the PE group comprised 20 patients treated with four PE. Fifty-eight linear and angular measurements were analyzed to assess the changes before and after treatment. Descriptive statistics, paired t -test, and multivariate analysis of variance were performed to evaluate the treatment effects within and between the two groups.
Results: The MCPP group presented 3.4 mm of retraction, 1.0 mm of extrusion, and 7.3o lingual inclination of the maxillary central incisor. In comparison, the PE group displayed greater amount of maxillary central incisor retraction and retroclination, mandibular incisor retraction, and upper lip retraction (5.3 mm, 14.8o, 5.1 mm, and 2.0 mm, respectively; p < 0.001 for all). In addition, the MCPP group showed 4.0 mm of distalization and 1.3 mm of intrusion with 2.9o distal tipping of the maxillary first molars.
Conclusions: These findings suggest the MCPP is an effective distalization appliance in the maxillary arch. The amount of incisor retraction, however, was significantly higher in the PE group. Therefore, four PE may be recommended when greater improvement of incisor position and soft-tissue profile is required.
키워드
Orthodontic implant; Adult treatment; Extraction vs. nonextraction; Modified C-palatal plate
원문 및 링크아웃 정보
등재저널 정보