Estudo de propriedades físico-químicas de um novo cimento obturador endodôntico

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Avaliação da resistência à fratura e tensões em diferentes implantes e conexões protéticas: Análise in vitro e MEF-3D

Pós-graduação em Odontologia - FOA

Influência da configuração e do bisel em esmalte bovino, nos preparos cavitários de classe v, para restaurações de resina composta compactável: estudo in vitro da infiltração marginal

Pós-graduação em Odontologia Restauradora - ICT

A poluição no rio Cocó, sub-bacia B-2, margem direita, e a expansão urbana de Fortaleza-CE

Pós-graduação em Geografia - IGCE

Resistência á fratura de diferentes selamentos de orifício de acesso ao parafuso de fiação e da porcela de cobertura de restaurações metalo-cerâmicas parafusadas implantossuportadas

Pós-graduação em Reabilitação Oral - FOAR

Análise de custo-efetividade de métodos preventivos para superfície oclusal de acordo com o risco de cárie: resultados de um ensaio clínico controlado

This study presents the results of a cost-effectiveness analysis in a controlled clinical trial on the effectiveness of a modified glass ionomer resin sealant ( Vitremer, 3M ESPE) and the application of fluoride varnish (Duraphat, Colgate) on occlusal surfaces of first permanent molars in children 6-8 years of age (N = 268), according to caries risk (high versus low). Children were examined semiannually by the same calibrated dentist for 24 months after allocation in six groups: high and low risk controls (oral health education every three months); high and low risk with varnish (oral health education every three months + varnish biannually); and high and low risk with sealant (oral health education every three months + a single application of sealant). Economic analysis showed that sealing permanent first molars of high-risk schoolchildren showed a C/E ratio of US$ 119.80 per saved occlusal surface and an incremental C/E ratio of US$ 108.36 per additional saved occlusal surface. The study concluded that sealing permanent first molars of high-risk schoolchildren was the most cost-effective intervention.

Interface of dentine to root canal sealers

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

Dentin Bond Strength: Influence of Er:YAG and Nd:YAG Lasers

The aim of this study was to investigate the effects of Er:YAG and Nd:YAG lasers on the shear bond strength of composite resin to dentin. The coronal portion of 56 human molars was divided into three parts, and the dentin thickness was standardized at 2 mm. A 3-mm hole was marked in the center of each tooth with sealing tape paper. The specimens (n = 14) were then divided into four groups: (1) acid etching + Single Bond (SB) (control), (2) acid etching + SB + Nd: YAG laser irradiation (before adhesive curing), (3) thermal etching with the Er: YAG laser + SB, and (4) thermal etching with the Er: YAG laser + SB + Nd: YAG laser irradiation (before adhesive curing). A composite resin cylinder was built into the delimited area for conducting the shear bond strength test on the universal testing machine. The means +/- standard deviations were: group 1, 17.05 +/- 4.15 MPa; group 2, 16.90 +/- 3.36 MPa; group 3, 12.12 +/- 3.85 MPa; and group 4, 12.92 +/- 2.73 MPa. Groups 1 and 2 presented significantly higher values than groups 3 and 4. It was concluded that conventional etching with 37% phosphoric acid yielded significantly higher bond strength values compared to thermal etching with the Er:YAG laser. The Nd:YAG laser did not significantly influence the bond strength.

Effects of laser beam energy on the pulsed Nd:YAG laser welding of thin sheet corrosion resistant materials

The aim of this study was to value the possibility to join, for pulsed Nd:YAG laser welding, thin foils lap joints for sealing components in corrosive environment. Experimental investigations were carried out using a pulsed neodymium: yttrium aluminum garnet laser weld to examine the influence of the pulse energy in the characteristics of the weld fillet. The pulse energy was varied from 1.0 to 2.5 J at increments of 0.25 J with a 4 ms pulse duration. The base materials used for this study were AISI 316L stainless steel and Ni-based alloys foils with 100 mu m thickness. The welds were analyzed by electronic and optical microscopy, tensile shear tests and micro hardness. The results indicate that pulse energy control is of considerable importance to thin foil weld quality because it can generate good mechanical properties and reduce discontinuities in weld joints. The ultimate tensile strength of the welded joints increased at first and then decreased as the pulse energy increased. In all the specimens, fracture occurred in the top foil heat-affected zone next to the fusion line. The microhardness was almost uniform across the parent metal, HAZ and weld metal. A slight increase in the fusion zone and heat-affected zone compared to those measured in the base metal was observed. This is related to the microstructural refinement in the fusion zone, induced by rapid cooling of the laser welding. The process appeared to be very sensitive to the gap between couples.

Análise isotópica (Delta15N) e química do capim-marandu adubado com ureia e cama de frango e diferido

Pós-graduação em Zootecnia - FMVZ

Comparação da infiltração marginal de restaurações adesivas empregando instrumento rotativo ou um sistema químico-mecânico na remoção do tecido cariado

Pós-graduação em Odontologia Restauradora - ICT

Avaliação da microinfiltração marginal em restaurações de classe V em resina composta em dentes bovinos: efeito de diferentes equipamentos para preparos cavitários e sistemas adesivos

Pós-graduação em Odontologia Restauradora - ICT

Estudo da viabilidade do tratamento de pacientes portadores de carcinoma epidermóide de lábio(T1nomo) por meio da radiação laser de dióxido de carbono (CO2)

Pós-graduação em Odontologia - ICT

Efeito do laser Nd:Yag no pré-tratamento dentinário e selamento marginal, em restaurações de cimento de ionômero de vidro resina modificado

Pós-graduação em Odontologia Restauradora - ICT

Alteração volumétrica por análise microtomográfica, solubilidade e capacidade seladora bacteriana de diferentes materiais retro-obturadores

Pós-graduação em Odontologia - FOAR