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AuthorMusa, Mazen
AuthorAwad, Riham
AuthorMohammed, Abdalla
AuthorAbdallah, Hibatalrahman
AuthorElhoumed, Mohamed
AuthorAl-waraf, Leena
AuthorQu, Wanting
AuthorAlhashimi, Najah
AuthorChen, Xi
AuthorWang, Shuang
Available date2023-05-15T06:13:54Z
Publication Date2023
Publication NameBMC Oral Health
ResourceScopus
ISSN1472-6831
URIhttp://dx.doi.org/10.1186/s12903-023-02893-4
URIhttp://hdl.handle.net/10576/42694
AbstractThe purpose of this study was to compare the perception of upper dental midline deviation on the attractiveness of a smile among raters from different ethnicities, professions, genders, and ages and measure to what extent the presence or absence of the associated smiling structures influence the raters' evaluations. Methods A male subject (26 years of age) with adequate smile characteristics was selected by 3 experienced orthodontists, and 561 raters from 2 different ethnic groups (281 Chinese raters and 280 Black raters) rated the subject's smile after the subject's upper dental midline was digitally altered from 0 to 5 mm using a 5-point Likert scale on 12 smile photographs divided into two groups: group 1, in the presence of smile related structures, two-thirds of the nose, lips, and chin (NLC), and group 2, in the absence of smile related structures, the lips only (L). Results There were statistically significant differences (p < 0.05) between the two ethnicities, in 2 mm and 4 mm in-group NLC and 5 mm in-group L, as well as the raters' profession to each midline shift of both groups (NLC) and (L) for both ethnicities except for 0 mm. Regarding the role of associated smile structures, the smile photos were observed in the presence of smile-associated structures, and in its absence (NLC × L), statistically significant differences (p < 0.05) were found when the deviation was 5 mm among the Chinese raters; in 1 mm, and 4 mm among the Black raters. Among different genders, statistical differences were only reported (p < 0.05) for Chinese raters for 5 mm in NLC, while statistical differences were observed for 2 mm and 3 mm in NLC for Black raters. For age categories, differences were observed (p < 0.05) for 4 mm, 5 mm in NLC and 4 mm, and 5 mm in L for Chinese raters, while 5 mm in NLC and 1 mm in L for Black raters. Conclusion Perception of the upper dental midline deviations was influenced by the factors of ethnicity, profession, presence or absence of smile-associated structures, as well as the gender and age of the raters.
SponsorThis work was supported by the Shaanxi program on key research and development projects (2018SF-031); Key Research and Development Program Project of the Science and Technology Department of Shaanxi Province (2019SF-176); and Xi'an Sciences and Technology Plan Project (XA2020-YXYJ-0389).
Languageen
PublisherBioMed Central Ltd
SubjectLayperson; Likert scale; Midline coincidence; Orthodontist; Smile
TitleEffect of the ethnic, profession, gender, and social background on the perception of upper dental midline deviations in smile esthetics by Chinese and Black raters
TypeArticle
Issue Number1
Volume Number23
dc.accessType Open Access


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