RESUMO
A procedure is described for making porcelain laminate veneers by using a preformed acrylic resin matrix to reproduce the original tooth form and surface texture. The procedure can be modified to allow alterations to the original contours by adding wax to, or carving, a preliminary cast. A silicone impression is made of either the teeth preoperatively or the altered cast and is used to construct a translucent heat-cured acrylic resin matrix. The matrix is fitted to the working cast and used to condense the porcelain for veneers. A patient's restorations are used to illustrate the procedure.
Assuntos
Porcelana Dentária , Facetas Dentárias , Modelos Dentários , Tecnologia Odontológica/métodos , Resinas Acrílicas , Adulto , Técnica de Moldagem Odontológica , Feminino , HumanosRESUMO
This study compared shear bond strengths of porcelain laminate veneers, fabricated on refractory dies, which were lengthened incisally by 0.5 mm. Specimens were divided into four separate groups. In group A, the teeth were reduced 0.5 mm and the bonding was to enamel. The teeth of the remaining groups were reduced 1.0 mm and the bonding was to dentin. For two of the groups glass ionomer liners were applied before etching. Bonding to enamel was best, with cohesive fractures in porcelain. In the other groups, failure was adhesive in nature, occurring at the resin-tooth interface.
Assuntos
Colagem Dentária , Forramento da Cavidade Dentária , Porcelana Dentária/química , Facetas Dentárias , Cimentos de Ionômeros de Vidro/química , Resinas Compostas/química , Preparo da Cavidade Dentária , Esmalte Dentário/ultraestrutura , Dentina/ultraestrutura , Planejamento de Dentadura , Humanos , Teste de Materiais , Estresse Mecânico , Propriedades de Superfície , Resistência à TraçãoRESUMO
The aim of this study was to evaluate the level of residual monomer in acrylic denture base materials having different polymerization properties. The investigation included a conventional-type acrylic cured under heat and pressure, as well as a pour-type resin polymerized by an injection-moulding technique at room temperature and under pressure. It was found that the residual monomer content ranged from 0.22-0.54% in pour-type resin, and from 0.23-0.52% in routinely used resins when the specimens were analysed by high performance liquid chromatography. These findings revealed that there were no significant differences between the two types of acrylic in terms of their residual monomer content.
