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1.
Oral Maxillofac Surg Clin North Am ; 33(2): 197-209, 2021 May.
Artículo en Inglés | MEDLINE | ID: mdl-33750651

RESUMEN

The delineation of excessive gingival display and review of current treatment options. Discussion over periodontal and prosthetic treatments, mucosal stripping procedures, myotomies, Botox therapy, and orthognathic procedures for correction of the "gummy smile."


Asunto(s)
Toxinas Botulínicas Tipo A , Estética Dental , Encía/cirugía , Humanos , Labio , Sonrisa
2.
Evid Based Dent ; 22(1): 30-31, 2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-33772130

RESUMEN

Design Randomised controlled trial.Intervention Undergraduate students aged 18 to 35 years were randomly allocated to either navigate a bespoke Instagram page featuring 'ideal' facial images as judged by five orthodontists (n = 71) or neutral images of nature (n = 61). Participants were allowed to view the Instagram page once and for a duration of five minutes.Outcome measures The primary outcome was facial dissatisfaction which was measured using the Facial Satisfaction Scale (FSS). Secondary outcomes included: body dissatisfaction, which was measured using the Body Satisfaction Scale (BSS), and overall body and facial dissatisfaction, measured as a sum of scores of BSS and FSS.Data analysis Data were analysed using repeated measures analysis of variance (ANOVA) and multivariate regression analyses.Results Exposure to 'ideal' facial images on Instagram resulted in significantly lower facial satisfaction scores (-2.39; 95% confidence interval [CI]: -4.32, -0.46 P <0.016), with no significant difference in BSS (-2.74; CI: -5.66, 0.19) and overall scores (-3.49; CI: -6.10, -0.87) when compared to the control group. Based on the multivariate regression analysis, high baseline self-discrepancy scores negatively affected both FSS and BSS.Conclusions Exposure to 'ideal' facial images on Instagram resulted in an immediate and negative impact on FSS when compared to neutral images of nature. While this study is interesting, further robust research to clarify the effect of various social networking sites on facial and bodily satisfaction remains necessary.


Asunto(s)
Insatisfacción Corporal , Medios de Comunicación Sociales , Adolescente , Adulto , Imagen Corporal , Humanos , Satisfacción Personal , Sonrisa , Adulto Joven
3.
Dental Press J Orthod ; 26(1): e211928, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33759965

RESUMEN

OBJECTIVE: To study the influence of black space between the maxillary central incisors on the aesthetic visual perception of the face, via eye-tracking and visual analogue scale (VAS). METHODS: Black space between the central incisors was created, for both sexes, as follows: control, 1-mm black space, 2-mm black space and 3-mm black space. Ninety raters participated in this study, divided into three groups: 30 laypeople, 30 nonorthodontists, and 30 orthodontists. After the visual calibration of each observer, eight photographs were presented in the Ogama® software concomitant with the use of the hardware The Eye Tribe®. Ogama generated information depending on the eye-tracking of each rater, regarding the time until the first fixation, time of fixation, heatmap, scanpath, and total time of fixation, to evaluate the areas deemed to be of interest according to the raters. Later on, the VAS was used, where each rater evaluated the images in an album on a scale of zero to 10 points. RESULTS: The eyes and mouth were the areas more often noticed by the raters according to the heatmaps, while no significant difference was observed in time until the first fixation between the three groups of raters (p> 0.05). However, regarding the time of fixation on the mouth, a significant difference was observed (p< 0.05) when comparing the three groups. CONCLUSION: Black space has a negative effect on the aesthetic perception of the face. The amount of attention on the mouth is correspondent to the size of the black space.


Asunto(s)
Estética Dental , Incisivo , Afroamericanos , Femenino , Humanos , Incisivo/anatomía & histología , Incisivo/diagnóstico por imagen , Masculino , Sonrisa , Escala Visual Analógica
4.
Gen Dent ; 69(2): 52-55, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33661115

RESUMEN

A "gummy smile," considered to be exposure of more than 3.0 mm of gingival tissue during a forced smile, negatively affects smile esthetics. The present case series describes the clinical indications and technique for applying botulinum neurotoxin type A (BoNTA) to correct a gummy smile and assesses the outcomes and satisfaction levels of 3 patients. The patients were told about the risks and benefits of the procedure and advised that their gummy smile was likely to recur within 6 months posttreatment. After the exposed gingival tissue of the patients was measured with a ruler, photographs were taken, and the patients recorded their pretreatment level of satisfaction with their smile on a visual analog scale (VAS), the patients were treated with BoNTA. The BoNTA was diluted in 1 mL of sterile saline according to the manufacturer's instructions, and an extraoral point of application was marked 1 mm lateral to each of the patient's nasal wings, close to the insertion of the elevator muscles of the upper lip and the nasal wings. At each location, 4 U was injected by tilting the syringe 45° in relation to the skin. Fourteen days after treatment, the gingival tissue exposed during a smile was again measured with a ruler, new photographic records were taken, and the patients' level of satisfaction with the treatment and the esthetic result was determined. Repositioning of the upper lip was observed in all patients. No adverse effects or complaints were reported. All 3 patients reported that they were satisfied with the outcome and wanted to continue therapy with BoNTA as needed. The results of the reported cases suggest that the application of BoNTA constitutes a safe, effective treatment for the correction of gummy smile and is well accepted by patients. However, for the treatment to be successful, it is essential that clinicians master the facial topographic anatomy and the technique to be employed.


Asunto(s)
Estética Dental , Sonrisa , Encía , Gingivectomía , Humanos , Labio
6.
J Esthet Restor Dent ; 33(1): 237-252, 2021 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-33609417

RESUMEN

Vertical positioning of the maxillary incisors is critical in smile design, and orthodontists also have the capability of working in the anterior-posterior plane of space. As a result, the anterior posterior positioning of the maxillary incisors becomes equally important for smile aesthetics. This manuscript presents the concept of smile projection for incorporation into the current concepts of smile design.


Asunto(s)
Actitud del Personal de Salud , Estética Dental , Humanos , Incisivo , Ortodoncistas , Sonrisa
7.
Am J Orthod Dentofacial Orthop ; 159(4): e311-e320, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33568274

RESUMEN

INTRODUCTION: This study aimed to analyze differences in esthetic smile preferences between Thai dentists and the general population and determine factors that affect smile perception. For the analysis, in addition to the frontal smile view, the three-quarter and lateral smile views were considered. METHODS: A computer-based questionnaire was used that comprised a demographic survey and multiple photographs of smiles. In total, 61 orthodontists, 180 general dentists, 378 orthodontic patients, and 421 laypersons were asked to select the most preferred digitally altered smile for each variable in the frontal, three-quarter, and lateral views. Chi-square and Kruskal-Wallis tests with post-hoc tests were used for comparing groups. Multiple linear regression was used to analyze the influence of demographic factors on smile esthetics. Significance was set at P < 0.05. RESULTS: Chi-square tests revealed significant differences in preference between men and women and between the professional and nonprofessional groups for almost all variables. Demographic factors influenced smile esthetics in the nonprofessional group. CONCLUSIONS: Both sex and dental knowledge background affected smile preference. The smile preferences of observers varied based on the view, and therefore, the lateral and three-quarter views should be routinely included in smile analyses. Demographics negligibly affected smile perception in the professional group, whereas they significantly affected perceptions in the nonprofessional group, especially age and education.


Asunto(s)
Estética Dental , Ortodoncistas , Actitud del Personal de Salud , Odontólogos , Femenino , Humanos , Incisivo , Masculino , Sonrisa
8.
Am J Orthod Dentofacial Orthop ; 159(4): e321-e329, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33568275

RESUMEN

INTRODUCTION: Although there is relative consensus about approaches to gingival smile management, there are still discrepancies as to whether a gingival smile is attractive or not. The purpose of this study was to quantify the influence of upper lip curvature shape and the amount of gingival display on the perception of smile attractiveness assessed by Peruvian orthodontists, dentists, and laypersons. METHODS: A frontal photograph was digitally altered to generate 3 types of upper lip curvature shapes (upward, straight, and downward) with 5 different levels of gingival smile exposure (0 mm, 2 mm, 3 mm, 4 mm, and 5 mm). Fifteen images were generated. Three groups of evaluators (50 dentists, 50 orthodontists, and 50 laypersons) assessed the images using a visual analog scale. One-way analysis of variance with Bonferroni post-hoc tests and multiple linear regressions were applied. RESULTS: The downward lip curvature shape had a negative effect on the esthetic evaluation of the smile with gingival exposures of 3 mm or more for all the evaluating groups (approximately 20-30 points less than upward or straight smile curvature shapes, P <0.05). Laypeople gave higher scores of almost 10 points more than dentists and orthodontists when evaluating the upward lip curvature shape with 5 mm of gingival exposure during smile (P = 0.029). CONCLUSIONS: We found that upward or straight upper lip curvature shapes have a positive impact on perceived smile esthetics. In contrast, downward upper lip curvature shapes have a negative effect on perception when evaluating different degrees of gingival smiles.


Asunto(s)
Labio , Salud Bucal , Actitud del Personal de Salud , Actitud Frente a la Salud , Estudios Transversales , Odontólogos , Estética Dental , Humanos , Incisivo , Sonrisa
9.
Artículo en Inglés | MEDLINE | ID: mdl-33528459

RESUMEN

Although it is generally accepted that a prosthetic restoration must take into account the gingiva, smile, and patient's face, it is often difficult to determine precisely what facial references must be considered. The purpose of this study was to determine the correct vertical and horizontal facial reference planes in esthetic prosthetic treatment. Using photographic analysis of 160 individuals, the different facial reference planes (interpupillary, intermeatic, intercommissural, and incisal edge lines; facial midline; and Camper and Frankfort planes) were compared to the ideal prosthetic reconstruction axis. Additional measurements, including the human eye's ability to perceive parallelism, were recorded. Most participants (64%) exhibited facial asymmetry. Asymmetry was horizontal (difference between widths of the right and left sides; 52.4%), vertical (difference between heights of the right and left sides; 6.9%), or mixed (4.7%). The interpupillary line is the main horizontal reference in 88.4% of situations, with the intercommissural line the second most important. In the profile view, the horizontal plane was on average 6.5 degrees above the Camper plane and 9 degrees below the Frankfort plane. The human eye's ability to perceive parallelism between two lines was found to be limited to differences of approximately 1 degree. During anterior tooth reconstruction, it is necessary to take into account the right horizontal and vertical esthetic references. Knowledge of the biometric facial parameters in natural dentition is necessary to define the right reconstruction axes based on the facial symmetry or asymmetry.


Asunto(s)
Estética Dental , Cara , Cefalometría , Cara/anatomía & histología , Asimetría Facial/terapia , Humanos , Sonrisa
10.
11.
Int J Esthet Dent ; 16(1): 10-32, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33502129

RESUMEN

Every human smile is unique and special, reflecting the different shapes, textures, and colors of the teeth as well as their combinations. This uniqueness conveys a direct and specific message when it comes to creating a new smile design. Dentists need to consider the 'unity of the whole' concept in this task, which involves bringing together biology, structure, function, and esthetics to create the fifth dimension of the smile. This approach is quite different from the traditional one. A smile reflects the personality and emotional state of the patient, and the translation of this into a new smile design occurs in various ways. This can be performed either through analog methods or digitally; however, the use of visual language will assist the dentist and dental technician in the creation of a personalized smile design. Nowadays, with the significant digital advances that have occurred in dentistry, there are systems on the market that help the dental team to create a personalized new smile design for each specific patient. The Rebel system is one example of such a system. It is actually a virtual laboratory that creates individualized smile designs in three dimensions. The system, with its very sophisticated artificial intelligence (AI)-based software, immediately creates a digital wax-up (STL file). It is therefore simple to use for dentists and dental technicians at all skill levels because the direct mock-up and wax-up stages are eliminated.


Asunto(s)
Inteligencia Artificial , Diente , Estética Dental , Humanos , Sonrisa , Programas Informáticos
12.
Quintessence Int ; 52(2): 104-110, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33433076

RESUMEN

Objective: To describe how to perform, in a simple manner, a digital wax-up with ?open source software for a clinical application involving direct ?composit?e resin restorations. Report: The clinical technique described presents a simple and highly predictable way of performing direct restorations with the help of a digital wax-up made with ?open source software. ?It uses an open source digital tooth library? to reestablish a more harmonious smile architecture, specifically of teeth that were worn due to parafunction, and restored with direct composite resin restorations.
Conclusions: Thanks to the technology that was used in this case, fast, affordable and accurate results c?ould be obtained. In addition, digital files can be stored, saving material, time, and space, and allowing identical replication of the work either virtually or printed at any time, if needed. (Quintessence Int 2021;52:104-110; doi: 10.3290/j.qi.a45426)

.


Asunto(s)
Resinas Compuestas , Sonrisa , Restauración Dental Permanente , Humanos , Impresión Tridimensional , Programas Informáticos , Flujo de Trabajo
13.
Av. odontoestomatol ; 36(4): 191-199, sept.-dic. 2020. ilus, graf
Artículo en Español | IBECS | ID: ibc-198589

RESUMEN

INTRODUCCIÓN: El análisis de la sonrisa en Odontología es fundamental al efectuar un tratamiento estético dentario. El propósito de este estudio es evaluar la percepción de distintos parámetros estéticos de la sonrisa entre Odontólogos, estudiantes de odontología y pacientes. MATERIALES Y MÉTODOS: Odontólogos, estudiantes de odontología y pacientes evaluaron 5 sets de fotografías de sonrisas a través de encuestas calificadas. Las fotografías fueron agrupadas de acuerdo a modificaciones efectuadas en 3 parámetros estéticos de la sonrisa: contorno gingival, línea labial (subdividida en A y B), y proporción dentaria (subdividida en ancho y largo). Los datos se analizaron mediante Chi-cuadrado. RESULTADOS: Un 80% de los Odontólogos y estudiantes consideran más atractivo un contorno gingival simétrico, un 73% de los pacientes consideran más atractivo hasta 1 mm de discrepancia del contorno gingival. Con respecto a la Línea labial A, tanto Odontólogos (67%) como estudiantes (77%) encontraron más atractiva una sonrisa con 2 mm de exposición gingival, 67% de los pacientes optaron 1 mm de exposición gingival. Para Línea labial B, 1 mm de exposición gingival fue considerado más atractivo por todos los encuestados. La proporción dentaria considerada mas atractiva entre el ancho del incisivo central y lateral fue 71%, y para ancho/largo del incisivo central fue más atractiva una proporción del 75% esto para los tres grupos encuestados. DISCUSIÓN: El contorno gingival fue el parámetro más sensible al momento de evaluar la estética de la sonrisa, para los otros dos parámetros no se encontraron diferencias significativas en las percepciones


INTRODUCTION: Smile analisis in dentistry is essential when performin dental aesthetic treatments. The purpose of this study is to evaluate the perception of different aesthetic parameters of the smile among dentists, dental students and patients. MATERIALS AND METHODS: Dentists, dental students and patients evaluated 5 sets of smile pictures through qualified surveys. The photographs were grouped according to modifications made in 3 smile aesthetic parameters: gingival contour, lip line (subdivided into A and B), and dental proportion (further subdivided in width and length). Data was statistically analyzed using Chi-square test. RESULTS: 80% of dentists and students considered more attractive a symmetrical gingival contour, 73% of patients consider more attractive a gingival contour discrepancy up to 1 mm. Regarding Lip Line A, both Dentists (67%) and students (77%) found more attractive a smile with 2 mm of gingival exposure, 67% of patients prefered 1 mm of gingival exposure. Lip Line B, with 1 mm of gingival exposure, was considered more attractive by all respondents. The dental proportion between the width of the central and lateral incisors considered more attractive was 71%; for the width / length of the central incisors, a proportion of 75% was more attractive for the all the groups surveyed. DISCUSSION: Gingival contour was the most sensitive parameter when evaluating the aesthetics of the smile. No significant diffrences in perception were found for the other two parameters included in this study


Asunto(s)
Humanos , Femenino , Adulto Joven , Adulto , Percepción , Estética Dental , Estudiantes de Odontología/estadística & datos numéricos , Sonrisa/fisiología , Odontólogos/estadística & datos numéricos , Chile
14.
Sensors (Basel) ; 20(24)2020 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-33333873

RESUMEN

Clinical studies have demonstrated that spontaneous and posed smiles have spatiotemporal differences in facial muscle movements, such as laterally asymmetric movements, which use different facial muscles. In this study, a model was developed in which video classification of the two types of smile was performed using a 3D convolutional neural network (CNN) applying a Siamese network, and using a neutral expression as reference input. The proposed model makes the following contributions. First, the developed model solves the problem caused by the differences in appearance between individuals, because it learns the spatiotemporal differences between the neutral expression of an individual and spontaneous and posed smiles. Second, using a neutral expression as an anchor improves the model accuracy, when compared to that of the conventional method using genuine and imposter pairs. Third, by using a neutral expression as an anchor image, it is possible to develop a fully automated classification system for spontaneous and posed smiles. In addition, visualizations were designed for the Siamese architecture-based 3D CNN to analyze the accuracy improvement, and to compare the proposed and conventional methods through feature analysis, using principal component analysis (PCA).


Asunto(s)
Expresión Facial , Sonrisa , Músculos Faciales , Humanos , Redes Neurales de la Computación , Análisis de Componente Principal
15.
Br Dent J ; 229(11): 739, 2020 12.
Artículo en Inglés | MEDLINE | ID: mdl-33311682

Asunto(s)
Sonrisa
16.
Angle Orthod ; 90(3): 405-410, 2020 05 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378442

RESUMEN

OBJECTIVES: To compare the effect of various degrees of decalcification after orthodontic treatment (white spot lesions) on orthodontists', general dentists', and laypersons' ratings of smile esthetics. MATERIALS AND METHODS: Eight photographs representing incrementally altered tooth decalcification lesions of maxillary anterior teeth ranging from mild to severe were shown randomly to the study participants. Photographs were rated by a matched sample of orthodontists (N = 42), general dentists (N = 52), and laypeople (N = 58). A visual analogue scale (VAS) was used to assess perceptions of smile esthetics. RESULTS: The three groups of raters could distinguish between different decalcification levels. Raters gave more negative scores as the decalcification level increased. CONCLUSIONS: The three groups of raters were able to distinguish between various degrees of decalcification lesions. General dentists were the most critical of all groups when rating decalcification lesions.


Asunto(s)
Caries Dental , Ortodoncia , Actitud del Personal de Salud , Actitud Frente a la Salud , Odontólogos , Estética Dental , Humanos , Incisivo , Ortodoncistas , Sonrisa
17.
Beijing Da Xue Xue Bao Yi Xue Ban ; 52(6): 1107-1111, 2020 Dec 18.
Artículo en Chino | MEDLINE | ID: mdl-33331322

RESUMEN

OBJECTIVE: To assess the reproducibility of non-verbal facial expressions (smile lips closed, smile lips open, lip purse, cheek puff) in normal persons using dynamic three-dimensional (3D) imaging and provide reference data for future research. METHODS: In this study, 15 adults (7 males and 8 females) without facial asymmetry and facial nerve dysfunction were recruited. Each participant was seated upright in front of the 3D imaging system in natural head position. The whole face could be captured in all six cameras. The dynamic 3D system captured 60 3D images per second. Four facial expressions were included: smile lips closed, smile lips open, lip purse, and cheek puff. Before starting, we instructed the subjects to make facial expressions to develop muscle memory. During recording, each facial expression took about 3 to 4 seconds. At least 1 week later, the procedure was repeated. The rest position (T0) was considered as the base frame. The first quartile of expressions (T1), just after reaching the maximum state of expressions (T2), just before the end of maximum state of expressions (T3), the third quartile of expressions (T4), and the end of motion (T5) were selected as key frames. Using the stable part of face such as forehead, each key frame (T1-T5) of the different expressions was aligned on the corresponding frame at rest (T0). The root mean square (RMS) between each key frame and its corresponding frame at rest were calculated. The Wilcoxon signed ranks test was applied to assess statistical differences between the corresponding frames of the different facial expressions. RESULTS: Facial expressions like smile lips closed, smile lips open, and cheek puff were reproducible. Lip purse was not reproducible. The statistically significant differences were found on the T2 frame of the repeated lip purse movement. CONCLUSION: The dynamic 3D imaging can be used to evaluate the reproducibility of facial expressions. Compared with the qualitative analysis and two-dimensions analysis, dynamic 3D images can be able to more truly represent the facial expressions which make the research more reliable.


Asunto(s)
Expresión Facial , Fotogrametría , Adulto , Cara/diagnóstico por imagen , Femenino , Humanos , Imagenología Tridimensional , Labio/diagnóstico por imagen , Masculino , Reproducibilidad de los Resultados , Sonrisa
18.
Rev. cuba. estomatol ; 57(4): e3346, Oct.-Dec. 2020. tab, graf
Artículo en Español | LILACS, CUMED | ID: biblio-1144451

RESUMEN

RESUMEN Introducción: El tratamiento ortodóntico tiene como objetivos fundamentales el logro de relaciones oclusales estables y la mejora en la expresión de la sonrisa. Particularmente, la posición de los incisivos centrales superiores presenta un rol importante en esta expresión y se ha sugerido el uso de referencias extracraneales para su correcta posición tridimensional. Conocer las preferencias de los distintos actores sociales respecto a este factor puede ayudar a las decisiones en la planificación de los tratamientos. Objetivo: Evaluar la percepción estética que ortodoncistas, cirujanos dentistas y personas no expertas tienen de la sonrisa con el incisivo central superior en posición anteroposterior respecto a la frente y en norma lateral. Métodos: Se empleó una fotografía en norma lateral en sonrisa de una mujer peruana con perfil normal y posición anteroposterior del incisivo central superior ideal según el elemento II de la armonía orofacial de Andrews. La fotografía fue modificada digitalmente de tal forma que se obtuvieron imágenes con los incisivos retruídos (- 4 mm) y protruidos (+ 4 mm). Las fotografías fueron evaluadas por un panel conformado por ortodoncistas, cirujanos dentistas y personas no expertas. La evaluación se realizó a través de una escala visual análoga. Resultados: La fotografía con la posición normal del incisivo central superior con respecto a la línea GALL fue mejor valorada por los ortodoncistas (67,658 ± 22,094) y por los no expertos (54,038 ± 20,524). Los cirujanos dentistas consideraron más agradable la posición protruida (60,804 ± 3,626). Se encontraron diferencias significativas entre los grupos de evaluadores y las fotografías (p < 0,05). Conclusiones: Los ortodoncistas mostraron una valoración de la estética más cercana a la norma para la posición anteroposterior de los incisivos. La posición anteroposterior de los incisivos juega un rol importante en la percepción de la estética de la sonrisa en norma lateral(AU)


ABSTRACT Introduction: Orthodontic treatment is mainly aimed at achieving stable occlusal relationships and enhancing the smile expression. The position of the upper central incisors plays a particularly important role in such an expression, and extracranial references have been suggested for its proper three-dimensional position. Awareness of the preferences of the various social actors involved may be useful to make appropriate decisions when planning the treatments. Objective: Evaluate the esthetic perception that orthodontists, dental surgeons and laypeople have of the smile with the upper central incisor in anteroposterior position with respect to the forehead and in lateral norm. Methods: A lateral norm photograph was used of a Peruvian woman with a normal profile and ideal anteroposterior position of the upper central incisor according to element II of Andrews' orofacial harmony. The photograph was digitally modified to obtain images with retruding (- 4 mm) and protruding (+ 4 mm) incisors. The photographs were evaluated by a panel composed of orthodontists, dental surgeons and laypeople. The evaluation was based on a visual analog scale. Results: The photograph with normal position of the upper central incisor with respect to the GALL line was ranked higher by orthodontists (67.658 ± 22.094) and laypeople (54.038 ± 20.524). To dental surgeons the protruded position was nicer (60.804 ± 3.626). Significant differences were found between the groups of evaluators and the photographs (p < 0.05). Conclusions: The esthetic appraisal of orthodontists was closer to the norm for anteroposterior position of incisors. The anteroposterior position of incisors plays an important role in the esthetic perception of the smile in the lateral norm(AU)


Asunto(s)
Humanos , Sonrisa , Estética Dental , Incisivo/fisiología
19.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(10): 729-736, 2020 Oct 09.
Artículo en Chino | MEDLINE | ID: mdl-33045783

RESUMEN

Objective: To explore and evaluate a three-dimensional (3D) digital simulated design and implementation technique in esthetic rehabilitation. Methods: Thirty patients with esthetic deficiency, who came to the Department of Prosthodontics, Peking University School and Hospital of Stomatology from December 2017 to July 2019, were recruited and randomly assigned into 2 groups. Four males and 11 females which were (36.0±10.5) years old in the experimental group, 6 males and 9 females which were (32.0±6.7) years old in the control group, were enrolled. In the experimental group, 3D digital simulated design was used to predict the post-treatment effect; and the final restorations were designed duplicating from the pre-treatment digital design confirmed by the patient and milled. In the control group, the final restorations were manufactured by the dental technician according to the design of two-dimensional (2D) digital smile design. The simulation degree of digital design and the similarity between preoperative design and postoperative rehabilitation were scored by the patients with visual analogue scales (VAS) in both groups; and the satisfaction rate to the restorations was evaluated by the patients. The quality of the restorations was accessed by a prosthodontist who did not know the grouping of patients according to the modified criteria of United States Public Health Service (USPHS). Results: Three-dimensional digital simulated design and implementation technique was successfully established. The VAS score on the simulation degree of digital design in the experimental group (8.5±0.5) was higher than that in the control group (7.2±0.7) (P<0.01); the VAS score on the similarity between preoperative design and postoperative rehabilitation in the experimental group (9.6±0.3) was higher than that in the control group (7.0±0.9) (P<0.01). The satisfaction rate of the patients to the restorations was significantly higher in the experimental group than in the control group (P<0.05). There was no significant difference of the quality of the restorations between the two groups on the anatomic form, the marginal adaption and the surface quality (P>0.05). Conclusions: Three-dimensional digital simulated design and implementation technique can help achieving 3D digital simulated design before treatment and duplication to the final restorations, and can improve the patients' satisfaction in esthetic rehabilitation.


Asunto(s)
Estética Dental , Sonrisa , Adulto , Odontólogos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Satisfacción del Paciente , Prostodoncia , Estados Unidos
20.
Annu Int Conf IEEE Eng Med Biol Soc ; 2020: 662-665, 2020 07.
Artículo en Inglés | MEDLINE | ID: mdl-33018074

RESUMEN

Patients suffering from chronic facial palsy are frequently impaired by severe life-long dysfunctions. Thus, the loss of the ability to close eyes rapidly and completely bears the risk of corneal damages. Moreover, the loss of smile and an altered facial expression imply psychological stress and impede a healthy social life. Since surgical and conservative treatments frequently do not solve many problems sufficiently, closed-loop neural prosthesis are considered as feasible approach. For it, amongst others a reliable detection of the currently executed facial movement is necessary. In our proof of concept study, we propose a data-driven feature extraction for classifying eye closures and smile based on intramuscular EMGs from orbicularis oculi and zygomaticus muscles of the patient's palsy side. The data-adaptive nature of the approach enables a flexible applicability to different muscles and subjects without patient-or muscle-specific adaptations.


Asunto(s)
Parálisis de Bell , Parálisis Facial , Cara , Músculos Faciales , Humanos , Sonrisa
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