Kula K, Esmailnejad A, Hass A
Department of Orthodontics and Dentofacial Orthopedics, University of Missouri at Kansas City 64108-2784, USA.
Angle Orthod. 1998 Feb;68(1):45-52. doi: 10.1043/0003-3219(1998)068<0045:DAAICW>2.3.CO;2.
Little is known about asymmetry of children's dental arches. The purposes of this study were to quantify and describe dental arch asymmetry of 151 children with large overjets, and to determine if a spatial relationship exists between dental landmarks in opposing arches. The median palatal plane (MPP) was the reference for transverse measurements. A computer-constructed transverse palatal plane (TPP) was the reference for anteroposterior measurements. More than 30% of the children had transverse asymmetries > or = 2 mm at the maxillary first permanent molar (paired t-test; p = 0.0001). The highest mean transverse asymmetry (1.59 +/- 1.24 mm) and anteroposterior asymmetry (1.51 +/- 1.23 mm) were at the maxillary first permanent molars. A higher proportion of children with large overjets had clinically significant intra-arch asymmetries (> or = 2 mm) at several bilateral landmarks than norms (99% confidence intervals). Only 3% of these children exhibited interarch molar asymmetries > or = 4 mm. The position of the landmarks in one arch varied with the landmarks in the opposing arch (Pearson's correlation; p = 0.0001). Although many children with large overjets have significant intra-arch asymmetries, few exhibit asymmetric interarch asymmetries.
关于儿童牙弓不对称的情况，人们了解甚少。本研究的目的是量化和描述151名深覆盖儿童的牙弓不对称情况，并确定相对牙弓中的牙标志点之间是否存在空间关系。腭中平面（MPP）作为横向测量的参考平面。计算机构建的腭横向平面（TPP）作为前后向测量的参考平面。超过30%的儿童上颌第一恒磨牙处的横向不对称≥2mm（配对t检验；p = 0.0001）。上颌第一恒磨牙处的平均横向不对称最高（1.59±1.24mm），前后向不对称最高（1.51±1.23mm）。与正常标准（99%置信区间）相比，深覆盖儿童中在几个双侧标志点处存在临床上显著的牙弓内不对称（≥2mm）的比例更高。这些儿童中只有3%表现出牙弓间磨牙不对称≥4mm。一个牙弓中标志点的位置随相对牙弓中的标志点而变化（Pearson相关性；p = 0.0001）。虽然许多深覆盖儿童存在显著的牙弓内不对称，但很少有表现出不对称的牙弓间不对称。
