Bruno Pereira Silva1, Emilio Jiménez-Castellanos2, Kyle Stanley3, Eduardo Mahn4, Christian Coachman5, Sivan Finkel6. 1. Clinical Professor Department of Periodontology School of Dentistry, University of Seville, Sevilla, Spain. 2. Professor of Prosthodontics, School of Dentistry, University of Seville, Sevilla, Spain. 3. Division of Restorative Sciences, Adjunct Faculty, Hermann Ostrow School of Dentistry of USC, Los Angeles, California. 4. Research Department, Faculty of Dentistry, Universidad de los Andes, Santiago, Chile. 5. Private Practice, Sao Paulo, Brazil. 6. Adjunct Clinical Instructor, Department of Cariology and Comprehensive Care, New York University College of Dentistry, New York, NY.
Abstract
OBJECTIVE: Asymmetric facial features such as a deviated nose and chin are common and known to affect smile esthetics. When presented with these asymmetries, the clinician must consider the impact they will have on the smile design parameters-especially the placement and angulation of the dental midline, which is a common starting point for a case involving smile design. The purpose of this article is to determine if the nose and chin deviations affect the perception of dental midline angulation. MATERIALS AND METHODS: An asymmetric facial model (AFM) was created from a digital symmetric facial model, used in a previous study by digitally deviating the nose and chin to the same side. Eight different pictures of this AFM were created, each with different degrees of maxillary midline angulation (both in and against the direction of the deviated nose and chin). Using a visual Likert scaled delivered via Websurvey in the private practice setting, one hundred and ninety-six randomly selected laypersons were asked to evaluate each image according to their own notions of beauty. RESULTS: A minor axial dental midline angulation of 3.5° can be perceived independently of the direction of the cant. All pictures where the midline was canted pointing in the opposite direction of nose and chin deviations presented lower rating mean values. CONCLUSIONS: Off-center noses and chins can influence the perceived attractiveness of a smile with a canted dental midline. The degree and direction of a canted midline can influence the harmony between the smile and overall face, with canting in the same direction of the asymmetric features being rated as more attractive. CLINICAL SIGNIFICANCE: The dental midline should be as vertically straight as possible. If a midline cant is present, however, it is more favorable to have a dental midline angulation which points in the same direction as nose and chin deviations, rather than in the opposite direction.
OBJECTIVE: Asymmetric facial features such as a deviated nose and chin are common and known to affect smile esthetics. When presented with these asymmetries, the clinician must consider the impact they will have on the smile design parameters-especially the placement and angulation of the dental midline, which is a common starting point for a case involving smile design. The purpose of this article is to determine if the nose and chin deviations affect the perception of dental midline angulation. MATERIALS AND METHODS: An asymmetric facial model (AFM) was created from a digital symmetric facial model, used in a previous study by digitally deviating the nose and chin to the same side. Eight different pictures of this AFM were created, each with different degrees of maxillary midline angulation (both in and against the direction of the deviated nose and chin). Using a visual Likert scaled delivered via Websurvey in the private practice setting, one hundred and ninety-six randomly selected laypersons were asked to evaluate each image according to their own notions of beauty. RESULTS: A minor axial dental midline angulation of 3.5° can be perceived independently of the direction of the cant. All pictures where the midline was canted pointing in the opposite direction of nose and chin deviations presented lower rating mean values. CONCLUSIONS: Off-center noses and chins can influence the perceived attractiveness of a smile with a canted dental midline. The degree and direction of a canted midline can influence the harmony between the smile and overall face, with canting in the same direction of the asymmetric features being rated as more attractive. CLINICAL SIGNIFICANCE: The dental midline should be as vertically straight as possible. If a midline cant is present, however, it is more favorable to have a dental midline angulation which points in the same direction as nose and chin deviations, rather than in the opposite direction.
Authors: Abolfazl Farahani; Karim Jafari; Ali Hemmati; Abbas Naghizadeh; Rahman Nemati; Mohammad Hossein Farahani Journal: Turk J Orthod Date: 2019-12-01
Authors: Joana Meneses Martins; Liliana Gavinha Costa; Ana Lidia Carvalho; Maria Conceição Manso; Sandra Gavinha; Mariano Herrero-Climent; Blanca Ríos-Carrasco; Carlos Falcão; Paulo Ribeiro Journal: Int J Environ Res Public Health Date: 2021-12-07 Impact factor: 3.390