成人骨骼Ⅲ类反合与开合错合畸形中联合部区域的形态学特征。
Morphological characteristics of the symphyseal region in adult skeletal Class III crossbite and openbite malocclusions.
作者信息
Chung Chooryung Judi, Jung Sinae, Baik Hyoung-Seon
机构信息
Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, South Korea.
出版信息
Angle Orthod. 2008 Jan;78(1):38-43. doi: 10.2319/101606-427.1.
OBJECTIVE
To evaluate the relationship of the morphological characteristics of the symphyseal region of adult Class III malocclusion to the differences in overjet and overbite.
MATERIALS AND METHODS
The basal and symphyseal widths along with the alveolar and symphyseal heights were evaluated using data from the lateral cephalograms of Korean adult male skeletal Class III, divided into crossbite (n = 28) and openbite (n = 41) groups. Korean male normal occlusion samples (n = 32) were used as controls.
RESULTS
The width of the symphyseal region including the basal width, point B width, Id width, symphyseal thickness, and pogonion width were similar in adult Class III crossbite and normal occlusion groups, but significantly less in the adult Class III openbite group (P < .001). The alveolar height was similar in the adult Class III crossbite and control groups, but significantly less in the adult Class III openbite group (P < .05). However, the symphyseal height was similar in all three groups.
CONCLUSIONS
An openbite, rather than a negative overjet, is the major factor influencing the symphyseal morphology in an adult Class III malocclusion.
目的
评估成人安氏III类错牙合患者下颌骨联合区形态特征与覆盖及覆牙合差异之间的关系。
材料与方法
利用韩国成年男性骨骼型安氏III类错牙合患者的头颅侧位片数据，将其分为反牙合组（n = 28）和开牙合组（n = 41），评估下颌骨联合区的基底部宽度、联合宽度以及牙槽高度和联合高度。选取韩国男性正常牙合样本（n = 32）作为对照。
结果
成人安氏III类反牙合组和正常牙合组中，包括基底部宽度、B点宽度、Id宽度、联合厚度及颏点宽度在内的联合区宽度相似，但成人安氏III类开牙合组显著更小（P <.001）。成人安氏III类反牙合组和对照组的牙槽高度相似，但成人安氏III类开牙合组显著更小（P <.05）。然而，三组的联合高度相似。
结论
在成人安氏III类错牙合中，开牙合而非负覆盖是影响下颌骨联合区形态的主要因素。
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