Department of Orthodontics, School of Dentistry, University of Alabama at Birmingham, Birmingham, Ala.
School of Health Professions, University of Alabama at Birmingham, Birmingham, Ala.
Am J Orthod Dentofacial Orthop. 2020 Mar;157(3):357-364. doi: 10.1016/j.ajodo.2019.03.030.
The purpose of this study was to evaluate and compare smile treatment outcomes between patients treated with Invisalign clear aligners (Align Technology, Santa Clara, Calif) and those treated with traditional fixed appliances by integrating variables such as lip symmetry, smile index, smile cant, buccal corridors, and gingival display into smile outcome evaluation.
Records from 58 patients, 29 of whom received Invisalign treatment (mean age 19.03 years) and 29 of whom received traditional fixed-appliance treatment (mean age 13.83 years), were compared for their smile outcome. Pretreatment scores, posttreatment scores, and differences between within-group smile score before and after treatment were determined for each group. Fifteen variables comprised the smile outcome, and the data were analyzed with the Mann-Whitney U test and the Wilcoxon t test for 2 dependent samples.
Six variables within the fixed-appliance group presented with better smile scores than those within the Invisalign group; buccal corridors (%) (mean difference = 8.42%), buccal corridors (mm) (5.35 mm), smile cant (0.42°), maxillary dental midline (0.21 mm), gingival display (0.56 mm), and smile index (1.09%) for P <0.05. Invisalign performed better on 2 variables that determined maxillary incisor position (1.26 mm) and inclination (2.09°). No significant difference (for P = 0.05) was shown between pretreatment and posttreatment scores for either of the 2 groups.
Using the 15 variables in this study, the results suggested that for patients with Class I nonextraction, treatment with traditional fixed appliances changes the patient's smile more than Invisalign treatment, and fixed appliances appear to be more effective in improving the variables that quantify posttreatment smile outcome.
本研究的目的是通过将唇对称性、微笑指数、微笑凸度、颊廊、牙龈显露等变量纳入微笑结果评估中，评估并比较使用 Invisalign 隐形矫正器（Align Technology，圣克拉拉，加利福尼亚州）和传统固定矫治器治疗的患者的微笑治疗结果。
比较 58 名患者（其中 29 名接受 Invisalign 治疗，平均年龄 19.03 岁，29 名接受传统固定矫治器治疗，平均年龄 13.83 岁）的微笑治疗结果。确定每组的治疗前评分、治疗后评分以及治疗前后组内微笑评分的差异。微笑结果包括 15 个变量，采用 Mann-Whitney U 检验和 Wilcoxon t 检验对 2 个独立样本进行分析。
固定矫治组的 6 个变量的微笑评分优于 Invisalign 组，分别为颊廊（%）（平均差异=8.42%）、颊廊（mm）（5.35mm）、微笑凸度（0.42°）、上颌牙中线（0.21mm）、牙龈显露（0.56mm）和微笑指数（1.09%），P<0.05。Invisalign 在确定上颌切牙位置（1.26mm）和倾斜度（2.09°）的 2 个变量上表现更好。两组治疗前后评分均无统计学差异（P=0.05）。
使用本研究中的 15 个变量，结果表明对于 I 类不拔牙患者，传统固定矫治器治疗比 Invisalign 治疗更能改变患者的微笑，固定矫治器在改善可量化的治疗后微笑结果变量方面似乎更有效。
