Perception Of Facial Asymmetry Research Articles

СВЯЗЬ ВОСПРИНИМАЕМОЙ АСИММЕТРИИ ЛИЦА С ПРИПИСЫВАЕМЫМИ ЧЕРТАМИ ЛИЧНОСТИ

Abstract. Although phrenology and physiognomy have been considered a pseudoscience, most people make consistent judgments based on faces. Though their knowledge may not be expressed in words, it involves stereotypes widespread across a given culture. Aim: to determine the relationships between perception of facial asymmetry and personality traits associated with stereotypical judgements. Materials and methods: 151 volunteers were recruited – 71% female (mean age 25.4 years, SD = 6.98) and 29% male (mean age 25.9 years, SD = 8.29). A new assessment method has been proposed: participants in addition to classifying 21 Caucasian male gray-scale facial images and their mirror images into one of three categories (symmetric, right asymmetric or left asymmetric) were asked to rate on a one to seven scale 19 polar opposite personality traits. Chi-squared test, ANOVA, independent t-tests, rank correlations were analyzed with SPSS Statistics Version 27. Results: Statistically significant differences were found among left asymmetry, right asymmetry, and symmetry classifications in the patterns of assessed personality traits; between the personality traits of the unaltered faces and their mirror images; faces judged as asymmetric and faces judged as symmetric; faces judged as asymmetric and symmetric by females; extreme right asymmetric faces and extreme left asymmetric faces. Significantly greater statistical differences were found for attributed personality traits of honest, calm, athletic, sociable, and distinctive. Conclusion: The detection that most of the socially desirable traits were found in the top five faces perceived as extremely right asymmetric rather than the top five extremely left asymmetric is most intriguing and warrants further research.

Factors contributing to the perception of facial asymmetry in dentists and laypersons

Factors contributing to the perception of facial asymmetry in dentists and laypersons

Perception of facial, dental, and smile esthetics by dental students.

To comprehensively assess dental students' perception of facial, dental and smile esthetics and to assess whether such a perception varies by gender, clinical training, and Grade Point Average (GPA). Series of photographs were digitally manipulated involving three facial, two smile, four dental, and one gingival components. Students in preclinical and clinical levels evaluated the original and manipulated images using a visual analogue scale scored from 1 to 5 where 5 is the standard image and 1 is the least pleasant one. The responses were then analyzed using Mann-Whitney test. A P value of < .05 was considered significant. Four hundred and eight dental students participated in this study. With regard to the overall esthetics, males and clinical students scored higher than females and preclinical students, respectively, did. With regard to the individual esthetic components, males had significantly higher scores in buccal corridors, midline shift, clinical crown width, and gingival marginal height, while females had significantly higher score in median diastema (P < .05). Clinical students had a better perception of facial asymmetry, gingival display, buccal corridors, and clinical crown width compared to the preclinical students. Effect of GPA was minimal and even contradictory; students with lower GPA had a better perception of midline deviation and occlusal canting than those with higher GPA scores. Male dental students, and unexpectedly unlike females, have a better perception of facial and dental esthetics. Unlike GPA, whose effect was minimal, clinical training has a substantial positive effect on the assessment of beauty. Appropriate perception of facial, dental and smile esthetics by dental students is of paramount importance for providing adequate dental services and for improving and polishing their professionalism.© 2018 Wiley Periodicals, Inc.

Conscious Perception of Facial Asymmetry in a Unilateral Cleft Lip Model.

Lip asymmetry after a unilateral cleft lip repair can be perceived as an unsatisfactory result. The objective of this study is to determine the degree of upper lip asymmetry and/or nasal alar hooding required for recognition of asymmetry in a simulated model of unilateral cleft lip. A model of unilateral cleft lip was created using digital morphing software to simulate asymmetries in vermilion height and nasal hooding in photographs of children. Volunteers were shown photographs for different time intervals and with varying degrees of asymmetry. Ability to detect facial asymmetry was recorded and analyzed. This study was conducted by surveying layperson volunteers in public community settings. 108 layperson volunteers were randomly surveyed. The primary outcome measure was a reported lip or nose asymmetry by the volunteers. Proportions and corresponding 95% confidence intervals were obtained to estimate the probability of reporting an asymmetry at 3- and 10-second intervals. After 3- and 10-second exposure, labial asymmetry was perceived by ≥50% of subjects at 2 mm (62%, P = .001) and 1 mm (89%, P < .0001), respectively. Nasal asymmetry was detected by <50% of subjects at 3 seconds, but ≥50% perceived a 3-mm alteration at 10 seconds (64%, P < .0001). Photographs with combined nasal and labial modification did not lower the threshold for asymmetry perception compared to either deformity alone. This study is the first to determine a predictable millimeter threshold for perceived asymmetry in cleft lip deformity using a digital model.

Single-Splint Technique for Correction of Severe Facial Asymmetry: Correlation between Intraoperative Maxillomandibular Complex Roll and Restoration of Mouth Symmetry

One of the most difficult problems to treat is the patient presenting with severe facial asymmetry and malocclusion whose chief complaint is the need for facial improvement. A canted intercommissural plane appears to be a major contributor to the patient's perception of facial asymmetry, but little is known about its correction. The authors adjust the intercommissural plane intraoperatively by modifying the maxillomandibular roll. However, a correlation between maxillomandibular roll and intercommissural plane change has not been demonstrated. The purpose of this study was therefore to determine whether such a correlation exists. A retrospective series of 18 patients with severe maxillomandibular asymmetry requiring differential maxillary impaction/extrusion (>2 mm difference in posterior maxillary vertical movement between the right and left sides) was studied. Preoperative and postoperative frontal photographs and lateral cephalometrics were studied to determine the effect of maxillomandibular complex roll on the intercommissural plane. Linear regression and statistical analysis were performed to determine the strength of the association between the two movements. A linear regression could be derived from the scatterplot tracing. A Pearson correlation demonstrated a significant positive relationship between vertical maxillomandibular complex change in roll and intercommissural plane changes (r = 0.8; p = 0.000, one-tailed). A correlation between maxillomandibular complex roll and intercommissural plane change has been demonstrated. This supports the usefulness of intraoperative change in maxillary roll to restore mouth symmetry in patients with severe facial asymmetry. It also identifies a major factor that can be modified to change mouth symmetry in the vertical plane during presurgical planning.