Yoon Sarah S, Chung Chun-Hsi
Private practice, San Francisco, Calif.
Chauncey M. F. Egel Endowed Chair and associate professor, Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pa.
Am J Orthod Dentofacial Orthop. 2015 Feb;147(2):190-6. doi: 10.1016/j.ajodo.2014.10.023.
The purposes of this study were to examine and compare the craniofacial growth in girls with Class I or Class II occlusion from the ages of 9 to 18.
Twenty-five Class I (ANB, 1°-4°) and 21 Class II (ANB, >4°) untreated Caucasian girls were selected from the Burlington Growth Centre in Toronto, Ontario, Canada. Cephalograms of each subject at ages 9, 14, and 18 years were traced, and 29 parameters were measured. The growth changes in each parameter from ages 9 to 14, 14 to 18, and 9 to 18 were calculated, and comparisons of each parameter were made between the 2 groups.
From ages 9 to 14, the Class I and Class II groups had similar skeletal growth patterns (increases of SNA and SNB angles, decreases of ANB, MP-SN, and gonial angles). Dentally, the Class II group showed less maxillary incisal proclination and more overbite than did the Class I group. From ages 14 to 18, the 2 groups also showed similar growth patterns, with little sagittal but continued vertical growth, and the MP-SN angle continued to decrease. From ages 9 to 18 (combined periods of 9-14 and 14-18), the 2 groups showed similar skeletal growth, with the exception of a slightly higher ANS-ME/N-Me in the Class I group. Dental changes were similar in the 2 groups, except that overbite increased slightly more in the Class II group.
Overall, the craniofacial growth patterns of Class I and Class II girls were similar. With growth, the face became more flattened with a decrease of the ANB angle, and the mandible demonstrated forward rotation with decreases of the MP-SN and gonial angles, and an increase of PFH:AFH.
本研究的目的是检查和比较9至18岁I类或II类咬合关系的女孩的颅面生长情况。
从加拿大安大略省多伦多市的伯灵顿生长中心选取25名未经治疗的I类（ANB，1°-4°）和21名II类（ANB，>4°）白种女孩。对每个受试者在9岁、14岁和18岁时的头影测量片进行描图，并测量29个参数。计算每个参数在9至14岁、14至18岁以及9至18岁之间的生长变化，并对两组之间的每个参数进行比较。
从9至14岁，I类和II类组具有相似的骨骼生长模式（SNA和SNB角增加，ANB、MP-SN和下颌角减小）。在牙齿方面，II类组比I类组显示出更小的上颌切牙前倾和更大的覆合。从14至18岁，两组也显示出相似的生长模式，矢状向生长很少但垂直生长持续，并且MP-SN角继续减小。从9至18岁（9至14岁和14至18岁的合并期），两组显示出相似的骨骼生长，I类组的ANS-ME/N-Me略高除外。两组的牙齿变化相似，只是II类组的覆合增加略多。
总体而言，I类和II类女孩的颅面生长模式相似。随着生长，面部变得更加扁平，ANB角减小，下颌骨向前旋转，MP-SN和下颌角减小，PFH:AFH增加。
