Thomas Mayuri, Reddy Rajesh, Reddy B Jayabharath
Department of Orthodontics and Dentofacial Orthopedics, Sri Sai College of Dental Surgery, Vikarabad, Andhra Pradesh, India.
Indian J Dent Res. 2011 Mar-Apr;22(2):242-7. doi: 10.4103/0970-9290.84295.
When we smile, our smile could often become the target of close scrutiny by the person you are smiling at. A trained eye readily detects any asymmetricity or any aspect of that smile which may be out of balance, or disharmonious with its environment. The purpose of this study was to determine whether any such asymmetric or symmetric dental discrepancies were detectable by various groups of evaluators.
The aim was to determine whether asymmetric and symmetric anterior dental discrepancies were detectable by orthodontists, general dentists, and laypersons, and to establish threshold levels for several specific aesthetic criteria that could be used by orthodontists and general dentists as an aid in the treatment planning.
Three images of smiles were intentionally altered with a software-imaging program. The alterations involved the crown length, crown width, midline diastema, and the papillary height of the maxillary anterior teeth. These altered images were then rated by groups of general dentists, orthodontists, and laypersons using a visual analog scale. Statistical analysis of their responses resulted in the establishment of threshold levels of attractiveness for each group.
The orthodontists were more critical than the general dentists and laypersons when evaluating asymmetric crown length discrepancies. All three groups could identify a unilateral crown width discrepancy of 2.0 mm. A small midline diastema was not rated as unattractive by any group. Reduction of papillary height was generally rated as less attractive.
Asymmetric alterations make teeth more unattractive not only to the dental professionals, but also to laypersons.
当我们微笑时，我们的笑容往往会成为我们微笑对象仔细审视的目标。训练有素的眼睛能轻易察觉到任何不对称性，或者笑容中任何可能失衡、与周围环境不协调的方面。本研究的目的是确定不同评估群体是否能检测到任何此类不对称或对称的牙齿差异。
目的是确定正畸医生、普通牙医和外行人是否能检测到不对称和对称的前牙差异，并为正畸医生和普通牙医在治疗计划中可作为辅助依据的几个特定美学标准确定阈值水平。
使用软件成像程序有意改变三张微笑图像。改变涉及冠长、冠宽、中线间隙以及上颌前牙的龈乳头高度。然后由普通牙医、正畸医生和外行人小组使用视觉模拟量表对这些改变后的图像进行评分。对他们的回答进行统计分析后确定了每组的吸引力阈值水平。
在评估不对称冠长差异时，正畸医生比普通牙医和外行人更严格。所有三组都能识别出2.0毫米的单侧冠宽差异。任何一组都未将小的中线间隙评为缺乏吸引力。龈乳头高度降低通常被评为吸引力较低。
不对称改变不仅会使牙齿对牙科专业人员，而且对外行人来说也更缺乏吸引力。
