title: Influence of etching time and bonding strategies on the microshear bond strength of self- and light-cured pit-and-fissure sealants.
abstract: This study evaluated the impact of extended etching and bonding strategies on the microshear bond strength of three sealant materials. Two pit-and-fissure sealants [FluroShield, Dentsply (light-cured) and AlphaSeal, DFL (self-cured)] and one light-cured flowable composite resin (Permaflo, Ultradent) were evaluated according to different enamel etching times (15 s or 30 s) and bonding procedures (no adhesive application, application of primer/hydrophobic resin or hydrophobic resin only). Intact enamel blocks were obtained from bovine teeth and sealed via the tested protocols. After 24 h, the microshear bond strength test was performed in a universal testing machine at a crosshead speed of 0.5 mm/min. Failure modes were classified by stereomicroscopy. Data were submitted to a three-way ANOVA and to Tukey's test (α=0.05). There was no statistically significant difference (p>0.05) among the materials. Permaflo showed higher bond strength when etched for 30 s alone. Enamel overetching decreased the bond strength of the light-cured sealant. Primer/bond previous treatment improved bond performance for AlphaSeal. In conclusion, from the tested conditions, all sealant materials presented similar bond strength values in relation to bonding protocol and etching time. The flowable composite can be used as a pit-and-fissure sealant. The use of a three-step adhesive system was essential for the self-cured sealant application.
authors.affiliation: Departament of Restorative Dentistry, Piracicaba Dental School, University of Campinas, SP, Brazil. edujcsj@gmail.com
authors.forename: Eduardo José
authors.initials: EJ
authors.lastname: Souza-Junior
authors.forename: Boniek Castillo Dutra
authors.initials: BC
authors.lastname: Borges
authors.forename: Marcos Antônio Japiassú Resende
authors.initials: MA
authors.lastname: Montes
authors.forename: Roberta Caroline Bruschi
authors.initials: RC
authors.lastname: Alonso
authors.forename: Glaucia Maria Bovi
authors.initials: GM
authors.lastname: Ambrosano
authors.forename: Mário Alexandre Coelho
authors.initials: MA
authors.lastname: Sinhoreti
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000737:chemistry*; D045662:Dental Etching / Q000379:methods*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D019544:Equipment Failure Analysis / Q000379:methods; D055115:Light-Curing of Dental Adhesives; D010895:Pit and Fissure Sealants / Q000737:chemistry*; D033081:Shear Strength
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D010895:Pit and Fissure Sealants