Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Bern, Switzerland.
Orthod Craniofac Res. 2021 Aug;24(3):351-359. doi: 10.1111/ocr.12441. Epub 2020 Dec 1.
To investigate the anteroposterior and vertical changes of the median rugae area, which is commonly used as dental model superimposition reference, relevant to its underlying skeletal structures.
Retrospectively collected pre- and post-treatment cephalometric radiographs and 3D digital dental models of 24 orthodontic patients (age at treatment start: 12.26 ± 0.83 years; assessment period: 2.13 ± 0.68 years) were analysed. All had mild to moderate malocclusions that were treated non-extraction with full fixed appliances.
The incisive papilla and rugae points were placed on the dental models that were then registered to the cephalometric radiographs. Afterwards, the radiographs were superimposed on Sella, ANS-PNS, and through a maxillary structural method. The vertical and horizontal movements of the papilla and the rugae points, as well as of a central incisor, were measured (Viewbox 4 software).
The incisive papilla and the three rugae points remained stable anteroposteriorly, but moved downwards in the vertical dimension (approximately 1-2 mm), in a similar manner (P > .05). However, the anteroposterior position of the papilla and the first rugae points were affected by changes in anterior tooth position and inclination (P < .05).
Both the second and third rugae can be used as superimposition references for tooth movement assessment. The use of the papilla and the first rugae area is not recommended, because they are affected by tooth movement. The outcomes of a palatal superimposition are comparable to those of a maxillary skeletal superimposition in the anteroposterior, but not in the vertical dimension.
研究中切牙嵴区域的前后和垂直变化，该区域通常用作牙模叠加参考，与潜在的骨骼结构相关。
回顾性收集 24 名正畸患者的治疗前后头颅侧位片和 3D 数字牙模（治疗开始时的年龄：12.26±0.83 岁；评估期：2.13±0.68 年）。所有患者均有轻度至中度错颌畸形，采用全固定矫治器非拔牙治疗。
将切牙乳头和嵴点放置在牙模上，然后将牙模注册到头颅侧位片上。之后，将头颅侧位片通过 Sella、ANS-PNS 和上颌结构方法进行叠加。测量乳头和嵴点以及中切牙的垂直和水平运动（Viewbox 4 软件）。
切牙乳头和三个嵴点在前后方向保持稳定，但在垂直方向上向下移动（约 1-2 毫米），方式相似（P>.05）。然而，乳头和第一嵴点的前后位置受前牙位置和倾斜度变化的影响（P<.05）。
第二和第三嵴都可以用作牙齿移动评估的叠加参考。不建议使用乳头和第一嵴区域，因为它们受牙齿移动的影响。腭部叠加的结果在前后方向上与上颌骨骼叠加的结果相当，但在垂直方向上则不同。
