Maurice T J, Kula K
Department of Orthodontics and Dentofacial Orthopedics, University of Missouri at Kansas City 64108-2784, USA.
Angle Orthod. 1998 Feb;68(1):37-44. doi: 10.1043/0003-3219(1998)068<0037:DAAITM>2.3.CO;2.
Many orthodontists evaluate dental asymmetry clinically by comparing landmarks on the occlusal surfaces of dental casts. The purpose of this study was to quantify and describe maxillary and mandibular intra-arch asymmetry in 52 Caucasian children in the mixed dentition, and to determine if a relationship exists between intra-arch and interarch asymmetry. The median palatal plane (MPP) was used as a reference for transverse measurements. A computer-constructed transverse palatal plane (TPP) was the reference for anteroposterior measurements. Asymmetry greater than 2.0 mm was present at any one landmark in 25% of the sample. Transverse asymmetries exceeded anteroposterior asymmetries in magnitude and prevalence. The high association (Pearson's correlation) between the positions of anteroposterior and transverse interarch landmarks indicated that the arches had similar dimensions. Many children in the mixed dentition have intra-arch asymmetries that are more severe and prevalent in the transverse plane than in the anteroposterior plane.
许多正畸医生通过比较牙模咬合面上的标志点来临床评估牙齿不对称情况。本研究的目的是量化和描述52名处于混合牙列期的白种儿童上颌和下颌牙弓内的不对称情况，并确定牙弓内不对称与牙弓间不对称之间是否存在关联。正中腭平面（MPP）用作横向测量的参考。计算机构建的横向腭平面（TPP）用作前后测量的参考。在样本的25%中，任何一个标志点处的不对称大于2.0毫米。横向不对称在程度和发生率上超过前后不对称。前后和横向牙弓间标志点位置之间的高度相关性（皮尔逊相关性）表明牙弓具有相似的尺寸。许多处于混合牙列期的儿童牙弓内存在不对称，且横向平面的不对称比前后平面更严重、更普遍。
