Estudio descriptivo in vitro de dos agentes blanqueadores de distinta concentración sobre la micromorfología del esmalte bovino

Dental tooth bleaching is a conservative option for the treatment of tooth stains. It is based on the use of hydrogen peroxide as an active agent. Despite its effectiveness to lighten tooth colour, there is concern regarding its use due to the effects it could have over enamel surface. There is scarce evidence on the subject and contradictions exist between different authors. The aim of this study was to compare enamel surface micromorphology after bleaching teeth with different concentrations of hydrogen peroxide solutions. Method: 50 healthy bovine incisors sectioned horizontally at the cemento-enamel junction were prepared. Contents of pulp chamber and tooth surfaces were cleaned. The buccal surface of each tooth was divided vertically, assigning one half to the control group (CG) and the other randomly to: Group 1: 25 samples treated with 15% hydrogen peroxide with nitrogen doped titanium dioxide. Group 2: 25 samples treated with 35% hydrogen peroxide. Square samples (2x2 mm.) were obtained and observed by SEM (magnification of 5.000x and 10.000x). Results: All treated groups showed longitudinal depressions on the surface and increased surface roughness. Conclusions: Tooth bleaching with hydrogen peroxide produces subclinical alterations over bovine enamel surface. 15% hydrogen peroxide bleaching agent produced less micromorphology alteration over bovine enamel surface than the 35% hydrogen peroxide agent.

Concentração de flúor e solubilidade em esmalte de dentes decíduos permanentes jovens após aplicações tópicas de soluções fluoretadas.

The aim of this article was to compare, through the distillation method, the incorporated amount of fluoride and the reduction of solubility in the enamel of both deciduous and young permanent teeth, following topical application of a 2% neutral sodium fluoride solution, according to the Knutson's technique and a 1.23% of acidulated solution, according to the Wellock & Brudevold's technique. The greatest fluoride incorporation was observed in the deciduous teeth after the usage of the 2% neutral solution. The amount of calcium and phosphorus liberation by the acid solution was greatest in the control group, followed by the group of teeth treated in acidulated solution and, finally, by those treated in 2% sodium fluoride solution.

Estudo da penetração de agentes ácidos para o condicionamento do esmalte dental em cimentos à base de hidróxido de cálcio.

It was verified the penetration of phosphoric acid into 3 commercial calcium hydroxide-based cements (Life, Renew and Prisma VLC Dycal). The colorimetric method employed permitted the identidication of phosphorus amount in representative samples of 6 successive layers 0.1 mm thick of each material. The acid etching used were the commercial products Scotchbond Etching Gel--3M at 36.114% by weight and Solução Condicionadora--Johnson & Johnson at 36.054% by weight. The contact time was 60 seconds. The result showed that layers 0.1 mm tick for Life and Prisma VLC Dycal and 0.2 mm thick for Renew were able to block the penetration of phosphoric acid solution whereas layers 0.1 mm thick for the 3 cements were able to block the penetration of phosphoric acid gel.

Estudo da infiltração marginal em restaurações de resinas compostas para dentes posteriores. Efeito do material, preparo cavitário e condicionamento do esmalte a nível cervical.

The purpose of this in vitro study was to investigate the cervical marginal leakage in class II restorations with chemically cured resin (P10) and light-cured resin (P30) in two types of cavities: conventional and adhesive. The effect of acid-etching in this area was also observed. Dentine adhesive Scotchbond was used in all experimental groups. Leakage was evidenced by Rodamina B dye penetration after thermocycling procedure between 10 degrees C and 50 degrees C temperature and analysed by using Zeiss Stereoscopic Magnifying Glass (10 X). According to the results obtained marginal leakage occurred in all experimental groups, with lower percentage for adhesives cavities when enamel acid-etching and light-cured resin P30 was used.

Proteína da matriz do esmalte associada a R.T.G. e vidro bioativo no tratamento de furca grau III em cães

This study investigated, both histologically and histometrically, the efficacy of enamel matrix derived proteins (EMD) associated with bioactive glass (BG) and an absorbable membrane in the treatment of class III furcation defects in mongrel dogs. After surgical defect creation and chronification, the lesions were randomly divided into three groups according to the treatment employed: Test Group 1 - EMD + BG + membrane, Test Group 2 - EMD + membrane and Control Group - BG + membrane. After a 90-day healing period, the dogs were sacrificed. The descriptive analysis and the histometric data showed similar results for the experimental groups in all studied parameters (MANOVA, p > 0.05). The association of Emdogain® with bioglass and GTR, or with GTR only, showed similar results when compared with the ones obtained with bioglass associated with membrane in the treatment of class III furcation defects in dogs. The three modalities of treatment showed partial filling of the furcations, with bone and cementum regeneration limited to the apical portion of the defects.

Estudo radiográfico da espessura do esmalte nas faces proximais de dentes anteriores e posteriores

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação da eficiência de adesão de um cimento resinoso autocondicionante (self-adhesive) sobre esmalte e dentina: efeito termociclagem e condicionamento dental : estudo in vitro

Pós-graduação em Odontologia Restauradora - ICT

Resistência adesiva de bráquetes ortodônticos colados com sistemas adesivos convencionais e auto-condicionantes ao esmalte bovino após ciclos térmicos e termomecânicos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito de agentes clareadores sobre a susceptibilidade do esmalte submetido a desafios erosivos in vitro

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ação do peróxido de hidrogênio 35% sobre a morfologia do esmalte e sua interferência do processo des-remineralização: estudo in situ

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estudo da rugosidade e ultra-estrutura superficial do esmalte dental humano submetido a diferentes métodos profiláticos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo comparativo da influência do condicionamento do esmalte humano e bovino com laser de Er:YAG sobre a resistência de união de um sistema adesivo convencional e de um sistema adesivo autocondicionante

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação dos efeitos causados por diferentes sistemas de clareamento dental sobre a estrutura superficial do esmalte e resina composta restauradora

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Análise da penetração de material resinoso ao esmalte dental em função de agente clareador e tempo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Rugosidade superficial do esmalte e de resinas compostas: avaliação de instrumentos de acabamento pelo microscópio de força atômica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)