Efeito do protocolo de cimentação e uso de protetor bucal no desempenho biomecânico de laminados cerâmicos e facetas diretas em resina composta

Abstract

Ceramic laminate veneers and direct composite veneers became more popular nowadays, therefore clarifying some topics about the light curing protocol and the interaction between light curing units and luting agents is very important, as well as clarifying aspects about protection of these restorations using mouthguards with and without modifications. The first objective was to evaluate the effect of moving the mono or multiwave light curing units and different exposure times on the degree of conversion and Knoop microhardness of light-cured resin cements with different photoinitiators. The results showed that localized exposure for 40 s resulted in better mechanical properties of the resin cements, unlike the moving LCU protocol and different photoinitiators were not affected by mono or multiwave LCU. The second objective evaluate the presence and thickness of ceramic laminate veneer and the protection with mouthguards with and without antagonist tooth contact by finite element analysis. It was concluded that 4 mm mouthguard generated similar behavior in 0.3 and 1 mm similar to healthy teeth, and the contact with antagonist tooth improved the stress distribution. The third objective evaluated the modification of a mouthguard with hard insert and air-space on the protection of direct composite veneers. Results showed that with the use of mouthguard the strain decreased and the conventional mouthguard presented higher shock absorption, similar to the air-space, on the other side, mouthguard with hard insert presented the lowest shock absorption. The fourth objective was to condense the results of the first three papers and to disclose with a clinical focus for publication in a national journal. The paper resulted on the condensation of the results and generated some guidelines to facilitate clinical application by dentists.