Torres Érica Miranda de, Valladares-Neto José, Bernades Karina de Oliveira, Naldi Luis Fernando, Torres Hianne Miranda de, Carvalho Alexandre Leite, Estrela Carlos
Divisão de Reabilitação Oral, Faculdade de Odontologia, Universidade Federal de Goiás, Goiânia, GO, Brazil.
Divisão de Ortodontia, Faculdade de Odontologia, Universidade Federal de Goiás, Goiânia, GO, Brazil.
Dental Press J Orthod. 2020 Mar;25(2):44-51. doi: 10.1590/2177-6709.25.2.044-051.oar. Epub 2020 May 29.
To evaluate facial profile changes promoted by polymethyl methacrylate (PMMA) cement graft to reduce excessive gingival display due to hyperactivity of the elevator muscles of the upper lip during smiling.
Eleven patients (all females, age range: 20 to 43 years) presenting gingival smile that were treated with PMMA cement grafts in a private clinic were selected for this retrospective study. Three angular and ten linear cephalometric facial profile measurements were performed preoperatively (baseline, T1) and at least 6 months postoperatively (T2). Differences between T1 and T2 were verified by Wilcoxon test, and the correlation between the thickness of the graft and facial profile changes was statistically evaluated by Spearman's Coefficient test. The significance level was set at p< 0.05.
The nasolabial angle (p= 0.03) and the labial component of the nasolabial angle showed statistically significant differences (p= 0.04), with higher values in T2. No correlations were found between the graft thickness and the statistically significant facial profile changes (p> 0.05).
The PMMA bone cement graft projected the upper lip forward, thereby increasing the nasolabial angle without affecting the nasal component. No correlations between the graft thickness and the facial profile changes were detected.
评估聚甲基丙烯酸甲酯（PMMA）骨水泥移植促进面部轮廓变化，以减少微笑时上唇提肌过度活动导致的牙龈过度外露。
选取11例（均为女性，年龄范围：20至43岁）在一家私人诊所接受PMMA骨水泥移植治疗牙龈微笑的患者进行这项回顾性研究。术前（基线，T1）和术后至少6个月（T2）进行了三项角度和十项线性头影测量面部轮廓。T1和T2之间的差异通过Wilcoxon检验进行验证，移植厚度与面部轮廓变化之间的相关性通过Spearman系数检验进行统计学评估。显著性水平设定为p < 0.05。
鼻唇角（p = 0.03）和鼻唇角的唇部成分显示出统计学上的显著差异（p = 0.04），T2时的值更高。在移植厚度与具有统计学意义的面部轮廓变化之间未发现相关性（p > 0.05）。
PMMA骨水泥移植使上唇向前突出，从而增加鼻唇角，而不影响鼻部成分。未检测到移植厚度与面部轮廓变化之间的相关性。
