Publications by authors named "Livia M Freitas"
Objective: To evaluate the degree of perception of laypersons, dental professionals, and students with regard to the esthetics of the smile in cases of mandibular incisor extractions with the presence of black spaces between them.
Materials And Methods: Changes were made to a front-view intraoral photograph of occlusion treated by means of a mandibular incisor extraction, simulating various configurations of black spaces between mandibular incisors. For this purpose, a specific image manipulation program was used (Photoshop CS3).
Objective: To evaluate the degree of perception of laypersons, dental professionals, and dental students regarding dental esthetics in cases with mandibular central incisor extraction.
Materials And Methods: Using a smile photograph of a person with normal occlusion and all teeth, modifications were made to reflect the extraction of a mandibular incisor of various compositions and sizes. For this purpose a program specifically for image manipulation (Adobe Photoshop CS3, Adobe Systems Inc) was used.
Objective: To test the null hypothesis that enamel deproteinization with 10% papain gel does not increase the shear bond strength of orthodontic brackets bonded with resin-modified glass ionomer cement (RMGIC).
Materials And Methods: One hundred and twenty bovine incisors were used and divided into eight groups: 1) Transbond XT according to the manufacturer's recommendations, 2) Transbond XT deproteinized with 10% papain gel, 3) RMGIC without enamel deproteinization and without etching, 4) RMGIC without enamel etching and with deproteinization with 10% papain gel, 5) RMGIC deproteinized with 10% papain gel and etched with polyacrylic acid, 6) RMGIC deproteinized with 10% papain gel and etched with phosphoric acid, 7) RMGIC deproteinized with 2.5% sodium hypochlorite, and 8) RMGIC etched with polyacrylic acid.
An alternative method of magnification for microvascular anastomosis was analyzed using an ordinary video camera and compared with the traditional method under microscope. For this study 20 rats were divided in two groups of 10 each: control group (microscope-assisted [M]) and experimental group (video-assisted [V]). Magnification was accomplished by a surgical microscope in group M, whereas a video system composed of low-cost camera, audiovisual cable, and analogue television in group V.
View Article and Find Full Text PDFObjective: This study aimed to compare skeletal, dentoalveolar and soft tissue characteristics in white and black Brazilian subjects presenting normal occlusions.
Material And Methods: The sample comprised the lateral cephalograms of 106 untreated Brazilian subjects with normal occlusion, divided into two groups: Group 1- 50 white subjects (25 of each gender), at a mean age of 13.17 years (standard deviation 1.
Article Synopsis
- The study aimed to assess sexual dimorphism in Bolton ratios among four ethnic groups: black, white, Afro-Mediterranean, and Japanese, and compare these ratios to established Bolton standards.
- The sample included 140 dental casts from subjects with normal occlusion, and various statistical tests (Kolmogorov-Smirnov, t test, one-way ANOVA) were employed to analyze the data.
- Results indicated that there was no significant sexual dimorphism in tooth-size ratios within any of the groups, although the Japanese anterior ratio was significantly lower than the Bolton standard.
Introduction: In this study, we aimed to cephalometrically compare anterior and posterior facial heights in young white and black Brazilian subjects with normal occlusion and to verify sexual dimorphism.
Methods: The sample comprised the lateral cephalograms of untreated normal Brazilians, divided into 2 groups. Group 1 included 74 white subjects (37 of each sex), with a mean age of 13.
Introduction: The purpose of this study was to compare the postretention stability of the correction of mandibular anterior-tooth irregularity in patients with Class II malocclusions whose orthodontic treatments included extraction of 2 or 4 premolars.
Methods: A total of 66 patients were selected who initially had at least one-half-cusp Class II malocclusions. Nineteen patients (9 male, 10 female) with an initial mean age of 14.