Abstract
Abstract Aims To determine the effect of varying the transverse cant of the anterior teeth on orthodontists’ and laypeople’s perceptions of smile aesthetics, and the influence that smile height has on this perception. Materials and methods A 20-year-old Chinese female with an aesthetic smile and normal occlusion was chosen and agreed to participate. Digital pictures of her posed smile were taken and manipulated to create three smile height variations: low, medium, or high. Each variation was further manipulated to create varying degrees of transverse anterior tooth cant. Fifty-six laypeople and 40 orthodontists participated as raters of the dental and facial impact of the altered smile images. Results The orthodontists more commonly and precisely identified the transverse cants of the anterior teeth and the detracting influence on smile aesthetics compared with laypersons. The orthodontists accepted a lesser range of anterior transverse cant. Increased smile heights enhanced the capability of all raters to detect a transverse cant and reduced the acceptable cant range. In addition, an increased smile height worsened the detracting effects of the transverse anterior cant in all raters’ perceptions of smile aesthetics. An increased display of teeth and angulation of an anterior cant increased the ability of raters in both groups to detect differences. Conclusion Transverse cants of anterior teeth can affect orthodontists’ and laypeople’s perceptions of smile aesthetics. Smile height and incisor display were significant factors that affected the orthodontist’s and layperson’s perceptions of smile aesthetics, and suggested that a description of the detracting effect of an anterior transverse cant should also consider smile height. Clinical relevance A transverse occlusal cant is an important aesthetic factor used by clinicians during orthodontic diagnosis and review. It is important to appreciate that there is a difference in perception between orthodontic professionals and patients (laypeople). The extent of this perceptual difference and influencing factors could help the clinician set more appropriate treatment goals.
Highlights
Achieving a harmonious soft-to-hard-tissue relationship between the dentofacial complex and improving smile aesthetics are essential goals of orthodontic treatment
A posed smile is a repeatable pattern that may be used to evaluate an improvement in smile aesthetics as a result of treatment.[2,3,4]
The gender or age of raters had no significant effects on the smile aesthetic assessments (p > 0.05)
Summary
Achieving a harmonious soft-to-hard-tissue relationship between the dentofacial complex and improving smile aesthetics are essential goals of orthodontic treatment. There has been a move towards greater awareness of the importance of anterior tooth display in orthodontic diagnosis and treatment.[1,2,3] Clinical examinations of dental arch form, arch width and symmetry may not be sufficient to describe the. A posed smile is a repeatable pattern that may be used to evaluate an improvement in smile aesthetics as a result of treatment.[2,3,4] A posed smile takes into account parameters such as dental arch form, buccal corridor, occlusal cant, midline deviation, incisal. Of the various parameters that affect smile aesthetics, an anterior transverse cant as a detracting aspect a transverse anterior cant is considered overwhelmof smile aesthetics. Previous studies have demonstrated that dental professionals and lay observers can identify smile characteristics that enhance or detract from anterior aesthetics.[18,19] Using a method previously reported to study the perception of an anterior transverse cant,[4] the present study was designed to investigate the influence that a transverse cant of the anterior teeth might have
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