Impact of adhesive and photoactivation method on sealant integrity and polymer network formation.
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.
Department of Dentistry, School of Dentistry, Potiguar University, Natal, RN, Brazil. boniek.castillo@gmail.com
Boniek Castillo Dutra
BC
Borges
Fabrício Lopes da Rocha
FL
Pereira
Roberta Caroline Bruschi
RC
Alonso
Rodivan
R
Braz
Marcos Antônio Japiassú Resende
MA
Montes
Isauremi Vieira de Assunção
IV
Pinheiro
Alex José Souza dos
AJ
Santos
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D003743:Dental Enamel / Q000737:chemistry; D018772:Dental Marginal Adaptation; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000528:radiation effects; D006245:Hardness Tests; D057927:Hydrophobic and Hydrophilic Interactions; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D010895:Pit and Fissure Sealants / Q000737:chemistry* / Q000528:radiation effects; D058105:Polymerization; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013997:Time Factors
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D010895:Pit and Fissure Sealants