Department of Orthodontics, School of Dentistry & Dental Research Institute, Seoul National University, Seoul, Korea.
Orthod Craniofac Res. 2013 May;16(2):65-74. doi: 10.1111/ocr.12006. Epub 2012 Sep 12.
To evaluate the possible soft tissue changes after debonding of labial brackets using three-dimensional (3D) images acquired by a laser scanner.
On the same day, 3D facial scans were taken immediately before debonding (T1) and immediately after debonding (T2) from 53 patients, and follow-up scans were taken 3 months after debonding (T3) from 31 patients. To compare the scans, superimpositions were performed and shell-to-shell deviations were used for quantitative analysis.
Shell-to-shell deviation map showing warm colors in lip and perioral tissue represented the retrusion of soft tissue after bracket removal. Soft tissue retrusion was significant for all landmarks immediately after debonding (T1-T2) and 3 months after debonding (T1-T3). Gender, bracket type, and the lip thickness variables did not show a clinically significant influence on the amount of soft tissue retrusion at the T1-T3 period. Lip corners and vermilion borders were significantly retruded at the T1-T3 period more than other perioral areas. A negative linear relationship was found in the amount of soft tissue retrusion immediately after debonding (T1-T2) and from debonding to 3 months after debonding (T2-T3).
Three-dimensional imaging showed significant changes in lip and perioral soft tissue after debonding of labial brackets. Clinically significant changes, approximately 2 mm of retrusion, occurred in the mouth corners bilaterally. Vermilion border landmarks also demonstrated significant changes in more than 1 mm. However, it was not possible to predict the soft tissue changes. A wide range of individual variability in the response to treatment and soft tissue adaptation was noted.
使用激光扫描仪获取的三维（3D）图像评估唇侧托槽去带后软组织可能发生的变化。
在同一天，从 53 名患者中在去带前（T1）和去带后即刻（T2）立即进行 3D 面部扫描，并从 31 名患者中在去带后 3 个月（T3）进行随访扫描。为了比较扫描结果，进行了叠加，并使用壳到壳偏差进行定量分析。
显示唇和口周组织暖色的壳到壳偏差图表示托槽去除后软组织的退缩。所有标志点在去带即刻（T1-T2）和去带后 3 个月（T1-T3）时的软组织退缩均具有统计学意义。性别、托槽类型和唇厚度变量在 T1-T3 期间对软组织退缩量没有显示出临床显著影响。唇角和唇红缘在 T1-T3 期间比其他口周区域退缩更为显著。在去带即刻（T1-T2）和从去带到去带后 3 个月（T2-T3）期间，发现软组织退缩量呈负线性关系。
三维成像显示唇侧托槽去带后口周软组织发生明显变化。双侧口角出现约 2 毫米的临床显著退缩，唇红缘标志点也出现超过 1 毫米的显著变化。然而，无法预测软组织变化。治疗和软组织适应性的个体差异范围广泛。
