Langberg B J, Peck S
Department of Growth and Development, Program in Orthodontics and Dentofacial Orthopedics, Harvard School of Dental Medicine, Boston, MA 02115, USA.
Am J Orthod Dentofacial Orthop. 2000 Aug;118(2):220-3. doi: 10.1067/mod.2000.104819.
This study investigates maxillary dental arch width in subjects with palatally displaced canines. Pretreatment dental casts of orthodontic patients with one or both maxillary canines palatally displaced (n = 31; male, 10; female, 21) were collected. This sample was matched according to sex and age with pretreatment dental casts from unaffected orthodontic patients. Arch widths were recorded between the maxillary first premolars and between the maxillary first molars. Interpremolar arch width and intermolar arch width comparisons between the sample with palatally displaced canines and the reference sample showed no statistically significant differences in their means, thus indicating that there was no statistically significant difference in the anterior and posterior arch width between the affected subjects and the control subjects. Thus, affected patients exhibit adequacy of maxillary dental arch width. This evidence refutes earlier conclusions that deficiency in maxillary transverse arch width is an associated contributing factor in the genesis of the anomaly of palatally displaced canines. Clinically, adequacy of dental arch width helps explain the "nonextraction" diagnostic appearance of most of these patients when they present for treatment.
本研究调查了患有腭向错位尖牙患者的上颌牙弓宽度。收集了上颌一侧或双侧尖牙腭向错位的正畸患者（n = 31；男性10例，女性21例）的治疗前牙模。根据性别和年龄，将该样本与未受影响的正畸患者的治疗前牙模进行匹配。记录上颌第一前磨牙之间以及上颌第一磨牙之间的牙弓宽度。腭向错位尖牙样本与参照样本之间的前磨牙间牙弓宽度和磨牙间牙弓宽度比较显示，其均值无统计学显著差异，因此表明患牙患者与对照患者在牙弓前后宽度上无统计学显著差异。因此，患牙患者的上颌牙弓宽度足够。这一证据驳斥了早期的结论，即上颌横向牙弓宽度不足是腭向错位尖牙畸形发生的一个相关促成因素。临床上，牙弓宽度足够有助于解释这些患者在就诊时多数呈现的“不拔牙”诊断表现。
