Impact of adhesive and photoactivation method on sealant integrity and polymer network formation

• Main Author: Borges, Boniek Castillo Dutra
• Publication Date: 2012
• Other Authors: Pereira, Fabrício Lopes da Rocha, Alonso, Roberta Caroline Bruschi, Braz, Rodivan, Montes, Marcos Antônio Japiassú Resende, Pinheiro, I. V. A., Santos, Alex Jose Souza dos
• Format: Article
• Language: eng
• Source: Repositório Institucional da UFRN
• dARK ID: ark:/41046/0013000003nnq
• Download full: https://repositorio.ufrn.br/jspui/handle/123456789/22991; http://dx.doi.org/10.1590/S1806-83242012000300011
• topic: Hardness tests; Dental marginal adaptation; Polymerization

We evaluated the influence of photoactivation method and hydrophobic resin (HR) application on the marginal and internal adaptation, hardness (KHN), and crosslink density (CLD) of a resin-based fissure sealant. Model fissures were created in bovine enamel fragments (n = 10) and sealed using one of the following protocols: no adhesive system + photoactivation of the sealant using continuous light (CL), no adhesive system + photoactivation of the sealant using the soft-start method (SS), HR + CL, or HR + SS. Marginal and internal gaps and KHN were assessed after storage in water for 24 h. The CLD was indirectly assessed by repeating the KHN measurement after 24 h of immersion in 100% ethanol. There was no difference among the samples with regard to marginal or internal adaptation. The KHN and CLD were similar for samples cured using either photoactivation method. Use of a hydrophobic resin prior to placement of fissure sealants and curing the sealant using the soft-start method may not provide any positive influence on integrity or crosslink density.