Department of Orthodontics, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Ramat Aviv, Tel Aviv, Israel.
Am J Orthod Dentofacial Orthop. 2011 Mar;139(3):339-44. doi: 10.1016/j.ajodo.2009.03.047.
Identification of the dental arch form of the orthodontic patient is a key aspect for achieving a stable, functional, and esthetic dentition. Failure to customize preformed archwires with the patient's arch form might increase the probability of relapse and lead to an unnatural smile. The primary objective of this study was to identify the arch forms of Israeli subjects with dental normocclusion and malocclusions. The secondary objective was to clarify the morphologic differences between Israeli and North American white subjects with various malocclusions.
The sample included 134 Israeli (40 Class I, 61 Class II, and 33 Class III) and 160 North American (60 Class I, 50 Class II, and 50 Class III) subjects. The most facial portion of 13 proximal contact areas was digitized from photocopied images of the mandibular dental arches. Clinical bracket points were calculated for each tooth based on mandibular tooth thickness data. Four linear and 2 proportional measurements were made. The dental arches were classified as square, ovoid, and tapered forms to determine and compare the frequency distributions between the 2 ethnic groups.
The most frequent mandibular arch form of the Israeli group was found to be ovoid as opposed to tapered in the North American white group. The white population had statistically significant decreased arch widths and increased arch depths compared with the Israeli population. The analysis of the Israeli sample indicated that, as the malocclusion shifts from Class III through Class I to Class II, the weight of the arch form tends to shift from square and ovoid to ovoid and tapered.
Our results suggest that, when treating Israeli patients, one should expect to use the preformed ovoid arch form orthodontic wires in a significant percentage of patients.
确定正畸患者的牙弓形态是实现稳定、功能和美观牙齿的关键方面。如果未能根据患者的牙弓形态定制预成型的弓丝，可能会增加复发的可能性，并导致不自然的笑容。本研究的主要目的是确定具有正常牙合和错牙合的以色列受试者的牙弓形态。次要目的是阐明具有不同错牙合的以色列和北美白种人之间的形态差异。
该样本包括 134 名以色列（40 名 I 类，61 名 II 类，33 名 III 类）和 160 名北美（60 名 I 类，50 名 II 类，50 名 III 类）受试者。从下颌牙弓的影印图像中数字化了 13 个近接触区的最面部部分。根据下颌牙齿厚度数据，为每个牙齿计算临床支架点。进行了 4 个线性和 2 个比例测量。将牙弓分类为方形、卵圆形和锥形，以确定和比较这两个种族群体的频率分布。
与北美白种人相比，以色列组最常见的下颌牙弓形态为卵圆形，而不是锥形。与以色列人相比，白人的牙弓宽度明显减小，牙弓深度增加。对以色列样本的分析表明，随着错牙合从 III 类通过 I 类到 II 类的转变，牙弓形态的权重倾向于从方形和卵圆形转变为卵圆形和锥形。
我们的结果表明，在治疗以色列患者时，预计在很大比例的患者中使用预成型的卵圆形弓丝正畸线。
