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

• Published in: Brazilian oral research Vol. 26; no. 3; pp. 249 - 255
• Main Authors: Borges, Boniek Castillo Dutra, Pereira, Fabrício Lopes da Rocha, Alonso, Roberta Caroline Bruschi, Braz, Rodivan, Montes, Marcos Antônio Japiassú Resende, Pinheiro, Isauremi Vieira de Assunção, Santos, Alex José Souza dos
• Format: Journal Article
• Language: English
• Published: Brazil Sociedade Brasileira de Pesquisa Odontológica - SBPqO 01-05-2012; Sociedade Brasileira de Pesquisa Odontológica
• Subjects: Analysis of Variance; Animals; Cattle; Composite Resins - chemistry; Composite Resins - radiation effects; Dental Enamel - chemistry; Dental Marginal Adaptation; Dentin-Bonding Agents - chemistry; Dentin-Bonding Agents - radiation effects; Dentistry; DENTISTRY, ORAL SURGERY & MEDICINE; Hardness Tests; Hydrophobic and Hydrophilic Interactions; Light-Curing of Dental Adhesives; Materials Testing; Pit and Fissure Sealants - chemistry; Pit and Fissure Sealants - radiation effects; Polymerization; Statistics, Nonparametric; Surface Properties; Time Factors; Polymerization; Hardness Tests; Dental Marginal Adaptation
• ISSN: 1806-8324; 1807-3107; 1807-3107; 1806-8324
• DOI: 10.1590/S1806-83242012000300011

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.