首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Evaluation of dental arch width and form changes after orthodontic treatment and retention with a new computerized method.
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Evaluation of dental arch width and form changes after orthodontic treatment and retention with a new computerized method.

机译:用一种新的计算机化方法评估正畸治疗和保留后牙弓的宽度和形状变化。

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摘要

The purpose of this study was to evaluate longitudinal arch width and form changes and to define arch form types with a new computerized method. Maxillary and mandibular models of 21 Class II Division 1 patients were examined before treatment (T(0)), after treatment (T(1)), and an average of 3 years after retention (T(2)). Arch width measurements were made directly on scanned images of maxillary and mandibular models. Arch form changes at T(0)-T(1) and T(1)-T(2) were evaluated by superimposing the computer-generated Bezier arch curves with a computer program. Types of dental arch forms were defined by superimposing them with the pentamorphic arch system, which included 5 different types of arch forms: normal, ovoid, tapered, narrow ovoid, and narrow tapered. Maxillary arch widths were increased during orthodontic treatment. Mandibular posterior arch widths were also increased. The expansion of the mandibular arch forms was less than in the maxillary arch forms. Arch width changes were generally stable,except for reduction in maxillary and mandibular interlateral, inter-first premolar, and mandibular intercanine widths. Pretreatment maxillary arch forms were mostly tapered; mandibular arch forms were tapered and narrow tapered. In maxillary arch forms, 76% of the treatment changes were maintained. Mandibular arch form was maintained in 67% of the sample, both during treatment and after retention. In mandibular arches, 71% of orthodontically induced arch form changes were maintained.
机译:这项研究的目的是评估纵向弓宽度和形状变化,并使用一种新的计算机化方法定义弓的形式类型。在治疗前(T(0)),治疗后(T(1))和保留后平均3年(T(2))检查21例II类1分类患者的上颌和下颌模型。足弓宽度测量直接在上颌和下颌模型的扫描图像上进行。通过将计算机生成的Bezier弓形曲线与计算机程序叠加,可以评估T(0)-T(1)和T(1)-T(2)的弓形变化。牙弓形式的类型是通过将它们与五形弓系统叠加而定义的,该系统包括5种不同类型的牙弓形式:正常,卵形,锥形,窄卵形和窄锥形。在正畸治疗期间,上颌弓宽度增加。下颌后弓宽度也增加了。下颌弓形的扩张小于上颌弓形。牙弓宽度变化总体稳定,除了上颌和下颌外侧,第一前磨牙间和下颌尖牙间的宽度减小。预处理的上颌弓形大多呈锥形;下颌弓呈锥形和窄锥形。在上颌弓形中,保留了76%的治疗改变。在治疗过程中和保留后,下颌弓形保持在67%的样品中。在下颌牙弓中,保持了71%的正畸引起的牙弓形态变化。

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