Effects of combined fixed functional appliances and skeletal anchorage in use on true mandibular growth in rats

2011 Fiscal Year Final Research Report

• Project/Area Number: 21592609
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Orthodontic/Pediatric dentistry
• Research Institution: Asahi University (2010-2011); Kagoshima University (2009)
• Principal Investigator: TAIRA Koji 朝日大学, 歯学部, 助教 (60535722)
• Co-Investigator(Kenkyū-buntansha): MIYAWAKI Shoichi 鹿児島大学, 大学院・医歯学総合研究科, 教授 (80295807) ; KITAI Noriyuki 朝日大学, 歯学部, 教授 (20271025)
• Project Period (FY): 2009 – 2011
• Keywords: 歯科矯正学 / 下顎骨 / 機能的矯正装置

Research Abstract

The aim of the present study was to investigate the effects of enhancement on mandibular growth during forward mandibular positioning simultaneous with prevention of flaring of mandibular incisors at the end of the growth period in rats. Twenty-one 56 days old male rats were randomly divided into two experimental groups(n=7) and one control(n=7). Computed tomography images were taken immediately before experimental(T0) and at 2(T2), 4(T4), 6(T6), 8(T8), 10(T10), 12(T12), 14(T14), 16(T16) weeks after the appliances were fitted. The mandibular length, ramus height and axial inclination of mandibular incisor were measured, and then those values were compared among the 3 groups. In this article, mandibular growth was accelerated effectively at end the growth period in rats by mandibular advancement with a fixed functional appliance combined with prohibition of labial movement of the lower incisor.