ABSTRACT
OBJECTIVE: To evaluate the influence of various light sources on the microhardness of human dental enamel following treatment with an in-office vital bleaching agent (35% hydrogen peroxide). METHODS AND MATERIALS: One-hundred and sixty dental enamel slabs (-2.5 x 2.5 x 1.0 mm) were obtained from 32 recently extracted human third molars, polished and subjected to hardness testing (KHN, 50g-load, 5 seconds) after four time periods (baseline and after 1, 7 and 14 days). The specimens were placed in intraoral appliances and delivered to eight volunteers after being equally divided into five groups each according to the light source treatment to be performed extraorally (n=32): Group LA (35% hydrogen peroxide + argon laser unit); Group HA (35% hydrogen peroxide + halogen light-curing unit); Group LED (35% hydrogen peroxide + LED-laser unit); Group OX (35% hydrogen peroxide + no light source unit); or Group CO (control: saliva only). Microhardness values were analyzed by ANOVA and Tukey's post-hoc test (alpha = 0.05). RESULTS: Significant decreases in KHN were found in enamel for the HA group one day and seven days after treatment (5.81% and 2.35%, respectively) (p < 0.0001). However, no significant differences were found between the baseline and final microhardness values for all groups submitted to bleaching. CONCLUSION: The different tested light sources did not significantly influence the microhardness of human enamel following treatment with 35% hydrogen peroxide.
Subject(s)
Curing Lights, Dental , Dental Enamel/radiation effects , Hardness/radiation effects , Tooth Bleaching , Adult , Analysis of Variance , Dental Enamel/drug effects , Halogens , Hardness/drug effects , Humans , Hydrogen Peroxide/pharmacology , Lasers, Gas , Lasers, Semiconductor , Light , Middle Aged , Molar, Third , Oxidants/pharmacology , Statistics, Nonparametric , Young AdultABSTRACT
Atualmente são verificadas, com grande incidência, alterações na superfície do esmalte dentário. A crescente demanda dos pacientes por tratamentos que melhorem a aparência dos dentes, devido à preocupação estética, tem desafiado os cirurgiões-dentistas a buscarem tratamentos conservadores, que resultem em um sorriso harmonioso. O objetivo deste artigo é demonstrar, através do relato de um caso clínico, a remoção de manchas brancas no esmalte por fluorose nos dentes anteriores superiores, pelas técnicas de clareação dentária e microabrasão do esmalte.
Subject(s)
Humans , Female , Adult , Tooth Bleaching/methods , Enamel Microabrasion , Hydrogen Peroxide , Esthetics, Dental , Fluorosis, Dental/therapy , Tooth CalcificationABSTRACT
OBJECTIVE: The objective of this in vitro study was to evaluate the influence of resin composite shade and location of the gingival margin (enamel or dentin) on the microleakage of proximal restorations on posterior teeth. METHODS AND MATERIALS: Sixty freshly extracted human third molars were prepared with standardized Class II box-shaped cavities with proportional size and shape, with distal gingival margins located on the enamel and mesial gingival margins on dentin. The teeth were randomly divided into 6 groups according to resin shade (n=10): G1-Incisal; G2-A1; G3-A2; G4-A3; G5-A3.5; G6-A4. The cavities were restored with a total-etch 1-bottle adhesive system and microhybrid resin composites inserted in 4 increments, light cured for 20 seconds through the occlusal surface, then an additional 60 seconds for each surface. After 1 week of immersion in distilled water, the specimens were thermocycled (500 cycles, 5 degrees -55 degrees C, 30 seconds dwell time), sealed with nail polish and immersed in 0.5% basic fuschin solution for 24 hours. The restorations were sectioned longitudinally, and microleakage was evaluated using a 0-3 score scale. RESULTS: Data were subjected to Kruskal-Wallis and Wilcoxon tests at p<0.05. No statistically significant differences between groups were observed regarding the shade of resin composite (p=0.8570). When margins (enamel or dentin) were considered separately, statistically significant differences were observed between groups (p<0.0001), with enamel margins exhibiting lower degrees of microleakage. CONCLUSION: The variation of resin composite shades utilized in this study did not influence the microleakage of Class II restorations. However, the location of the gingival margin influenced the microleakage.
Subject(s)
Composite Resins/chemistry , Dental Enamel/ultrastructure , Dental Leakage/classification , Dental Restoration, Permanent/methods , Dentin/ultrastructure , Acid Etching, Dental , Bisphenol A-Glycidyl Methacrylate/chemistry , Color , Coloring Agents , Dental Bonding , Dental Cavity Preparation/classification , Dental Restoration, Permanent/classification , Dentin-Bonding Agents/chemistry , Humans , Materials Testing , Molar, Third , Rosaniline Dyes , Surface PropertiesABSTRACT
O clareamento dentário é um dos tratamentos odontológicos mais solicitados para obtenção de um sorriso mais estético. Ele pode ser classificado em caseiro ou de consultório. A técnica mais utilizada atualmente é a caseira, que consiste basicamente na moldagem das arcadas dentárias para obtenção de modelos em gesso, confecção da moldeira de silicone e aplicação da solução clareadora sobre os dentes indicados por um determinado período. Já o clareamento dentário no consultório é uma alternativa para o paciente que não foi capaz de realizar o regime caseiro ou requer resultados mais rápidos, podendo estar associado à utilização de unidades ativadoras. O objetivo deste artigo foi explanar as características das duas técnicas e comparar suas vantagens e limitações.
Subject(s)
Humans , Female , Adult , Tooth Bleaching/methods , Hydrogen Peroxide , Peroxides , Esthetics, Dental , Smiling/psychologyABSTRACT
O clareamento dental é um dos procedimentos clínicos mais utilizados nos consultórios odontológicos. Este tratamento difundiu-se rapidamente entre os pacientes pela melhora da aparência estética dos dentes sem promover desgastes na estrutura dental. Devido à grande procura por tratamentos clareadores, muitos trabalhos foram realizados em nível laboratorial, in situ e in vitro, a fim de avaliar seus efeitos sobre a estrutura dental. Porém, existem poucos trabalhos clínicos disponíveis na literatura. Este trabalho teve como objetivo avaliar clinicamente a alteração de cor, a sensibilidade dental e a irritação gengival em pacientes submetidos ao clareamento dental através da técnica caseira.
