Professor, Department of Restorative Dentistry and Oral Function, Faculty of Dentistry, Universidad de los Andes, Santiago, Chile.
Instructor, Department of Restorative Dentistry and Oral Function, Faculty of Dentistry, Universidad de los Andes, Santiago, Chile.
J Prosthet Dent. 2018 Oct;120(4):513-519. doi: 10.1016/j.prosdent.2017.11.017. Epub 2018 Apr 5.
Therapeutic procedures that increase occlusal vertical dimension (OVD) may have different responses in patients with different craniofacial vertical patterns. The effect on these patients of increasing their OVD is not well understood.
The purpose of this clinical study was to compare measurements of vertical jaw separation (VJS) in patients with brachyfacial and dolichofacial craniofacial patterns in 2 vertical dimensions: the clinical rest/postural vertical dimension (CR/PVD) and electromyographic rest vertical dimension (EMGRVD).
Sixty healthy dental students were selected at random after a lateral skull radiograph was made. The Ricketts (VERT index) analysis was used to determine 30 brachyfacial (G1) and 30 dolichofacial (G2) types. The VJS was measured for G1 and G2 types in the 2 rest vertical dimensions specified. CR/PVD was recorded using 2 methods: swallowing (CR/PVD-P1) and the phonetic breathing method (CR/PVD-P2). The Shapiro-Wilk test was used for data distribution, and the Mann-Whitney U test was used to accept or reject the null hypothesis (α=.05).
Mean VJS in CR/PVD-P1 was 1.92 ±1.14 mm for the brachyfacial and 1.36 ±0.58 mm for the dolichofacial facial group (P=.05). The mean VJS in CR/PVD-P2 was 1.89 ±1.17 mm for the brachyfacial and 1.31 ±0.58 mm for the dolichofacial group (P=.03). The mean VJS in EMGRVD was 8.23 ±2.21 mm for the brachyfacial and 16.55 ±4.29 mm the dolichofacial group (P<.001).
CR/PVD measurements in dolichofacial individuals were lower than those in brachyfacial individuals. EMGRVD measurements were higher in dolichofacial individuals than those in brachyfacial individuals. Biomechanical, physiological, and behavioral reasons might explain such diversity.
增加咬合垂直距离（OVD）的治疗程序在具有不同颅面垂直模式的患者中可能会有不同的反应。对于这些患者来说，增加他们的 OVD 的效果尚不清楚。
本临床研究的目的是比较颌面短缩和长面型患者在两种垂直尺寸（临床休息/姿势垂直距离（CR/PVD）和肌电图休息垂直距离（EMGRVD））的垂直颌间分离（VJS）测量值。
随机选择 60 名健康牙科学员进行侧颅 X 光检查。使用 Ricketts（VERT 指数）分析来确定 30 例颌面短缩型（G1）和 30 例长面型（G2）。在指定的 2 种休息垂直距离下测量 G1 和 G2 类型的 VJS。使用两种方法记录 CR/PVD：吞咽（CR/PVD-P1）和语音呼吸法（CR/PVD-P2）。使用 Shapiro-Wilk 检验进行数据分布，使用 Mann-Whitney U 检验接受或拒绝零假设（α=.05）。
在 CR/PVD-P1 中，颌面短缩型的平均 VJS 为 1.92 ±1.14mm，长面型的平均 VJS 为 1.36 ±0.58mm（P=.05）。在 CR/PVD-P2 中，颌面短缩型的平均 VJS 为 1.89 ±1.17mm，长面型的平均 VJS 为 1.31 ±0.58mm（P=.03）。在 EMGRVD 中，颌面短缩型的平均 VJS 为 8.23 ±2.21mm，长面型的平均 VJS 为 16.55 ±4.29mm（P<.001）。
长面型个体的 CR/PVD 测量值低于颌面短缩型个体。长面型个体的 EMGRVD 测量值高于颌面短缩型个体。生物力学、生理和行为原因可能解释这种差异。
