Int J Oral Maxillofac Implants. 2024 Oct 16;39(5):745-754. doi: 10.11607/jomi.10749.
To investigate the influence of a single infrapositioned ankylosed tooth or implant-supported restoration on smile esthetics.
A series of 48 digitally modified images that simulated varying degrees of infraposition (from 0.25 to 2.0 mm, with a step of 0.25 mm) were created for each maxillary anterior tooth by altering the full-portrait image of a smiling man, adjusted to show medium and high smile lines. For the model with the high smile line, a series of 24 digitally modified images were created that simulated the infraposition of a single anterior tooth with a restored incisal edge. Smile esthetics for each of the images were evaluated by 160 participants (80 dentists and 80 laypersons), and a visual analog scale (VAS) was implemented.
For the images with the high smile line, an infraposition of ≥ 0.25 mm in the central incisor region and ≥ 0.5 mm in the region of the lateral incisor or the canine had a negative effect on the perceived smile esthetics for both the dentists and the laypersons. Regarding the medium smile line, an infraposition of ≥ 0.5 mm in the central and lateral incisor region had a negative effect on the perceived smile esthetics for both groups of observers. In the canine area, an infraposition of ≥ 0.5 mm for the dentists and ≥ 0.75 mm for the laypersons also had a negative impact on the smile esthetics.
Even a minor infraposition of a single maxillary anterior ankylosed tooth or implant-supported restoration can reduce the perceived attractiveness of the smile. Infraposition in the canine site can be better tolerated in a medium smile line compared to a high smile line. In patients with a high smile line, prosthetic intervention is needed to restore the incisal edge of an infrapositioned tooth without harmonizing the gingival contour; this can be beneficial for the lateral incisor but ineffective for the central incisor and unfavorable for the canine.
研究单个低位黏结牙或种植体支持修复体对上颌前牙微笑美学的影响。
通过改变一个微笑男性的全口像，调整以显示中高微笑线，为每个上颌前牙创建了一系列 48 个数字修改图像，模拟不同程度的低位（从 0.25 毫米到 2.0 毫米，步长为 0.25 毫米）。对于高微笑线模型，创建了一系列 24 个数字修改图像，模拟单个前牙的低位和修复切缘。160 名参与者（80 名牙医和 80 名非专业人士）对每个图像的微笑美学进行了评估，并采用视觉模拟量表（VAS）。
对于高微笑线的图像，在中切牙区域的低位≥0.25 毫米和侧切牙或尖牙区域的低位≥0.5 毫米对牙医和非专业人士的感知微笑美学都有负面影响。对于中微笑线，在中切牙和侧切牙区域的低位≥0.5 毫米对两组观察者的感知微笑美学都有负面影响。在尖牙区域，牙医的低位≥0.5 毫米和非专业人士的低位≥0.75 毫米对微笑美学也有负面影响。
即使是单个上颌前牙的轻微低位黏结或种植体支持修复体也会降低微笑的吸引力。在中微笑线中，低位在前磨牙部位比高位更容易被接受。对于高微笑线的患者，需要进行修复治疗来恢复低位牙齿的切缘，而不调整牙龈轮廓；这对侧切牙有益，但对中切牙无效，对尖牙不利。
