Influence Of Etching Time And Bonding Strategies On The Microshear Bond Strength Of Self- And Light-cured Pit-and-fissure Sealants

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.235477483Martignon, S., Ekstrand, K.R., Gomez, J., Lara, J.S., Cortes, A., Infiltrating/sealing proximal caries lesions: A 3-year randomized clinical trial (2012) J Dent Res, 91, pp. 288-292McComb, D., Conservative operative management strategies (2005) Dent Clin N Am, 49, pp. 847-865Kantovitz, K.R., Pascon, F.M., Correr, G.M., Alonso, R.C., Rodrigues, L.K., Alves, M.C., Puppin-Rontani, R.M., Influence of environmental conditions on properties of ionomeric and resin sealant materials (2009) J Appl Oral Sci, 17, pp. 294-300Papacchini, F., Cury, A.H., Goracci, C., Chieffi, N., Tay, F.R., Polimeni, A., Noninvasive pit and fissure sealing: Microtensile bond strength to intact bovine enamel of different pit and fissure sealants in a simplified fissure model (2006) J Adhes Dent, 8, pp. 375-380Tianviwat, S., Chongsuvivatwong, V., Sirisakulveroj, B., Loss of sealant retention and subsequent caries development (2008) Community Dent Health, 25, pp. 216-220Borges, B.C., Campos, G.B., Silveira, A.D., Lima, K.C., Pinheiro, I.V., Efficacy of a pit and fissure sealant on arresting dentin non-cavitated caries: A 1-year follow-up, randomized, controlled clinical trial (2010) Am J Dent, 23, pp. 311-316Borsatto, M.C., Thomaz, M.Y., Contente, M.M., Gomes-Silva, J.M., Mellara, T.S., Galo, R., Bonding agent underneath sealant: Shear bond strength to oil-contaminated enamel (2010) Braz Dent J, 21, pp. 50-54de Munck, J., van Landuyt, K., Peumans, M., Poitevin, A., Lambrechts, P., Braem, M., A critical review of the durability of adhesion to tooth tissue: Methods and results (2005) Dent Res, 84, pp. 118-132Pivetta, M.R., Moura, S.K., Barroso, L.P., Lascala, A.C., Reis, A., Loguercio, A.D., Bond strength and etching pattern of adhesive systems to enamel: Effects of conditioning time and enamel preparation (2008) J Esthet Restor Dent, 20, pp. 322-335Barkmeter, W.W., Erickson, R.L., Kimmes, N.S., Latta, M.A., Wilwerding, T.M., Effect of enamel etching time on roughness and bond strength (2009) Oper Dent, 34, pp. 217-222Jain, P., Stewart, G.P., Effect of dentin primer on shear bond strength of composite resin to moist and dry enamel (2000) Oper Dent, 25, pp. 51-58Woronko Jr., G.A., St Germain Jr., H.A., Meiers, J.C., Effect of dentin primer on the shear bond strength between composite resin and enamel (1996) Oper Dent, 21, pp. 116-121Papacchini, F., Goracci, C., Sadek, F.T., Monticelli, F., Garcia-Godoy, F., Ferrari, M., Microtensile bond strength to ground enamel by glass-ionomers, resin-modified glass-ionomers, and resin composites used as pit and fissure sealants (2005) J Dent, 33, pp. 459-467Borges, B.C., Bezerra, G.V., Mesquita, J.A., Pereira, M.R., Aguiar, F.H., Santos, A.J., Effect of irradiation times on the polymerization depth of contemporary fissure sealants with different opacities (2011) Braz Oral Res, 25, pp. 135-142Marcushamer, M., Neuman, E., García-Godoy, F., Fluoridated and nonfluoridated unfilled sealants show similar shear strength (1997) Pediat Dent, 19, pp. 289-290Attar, N., Tam, L.E., McComb, D., Flow, strength, stiffness and radiopacity of flowable resin composites (2003) J Can Dent Assoc, 69, pp. 516-521Corona, S.A., Borsatto, M.C., Garcia, L., Ramos, R.P., Palma-Dibb, R.G., Randomized, controlled trial comparing the retention of a flowable restorative system with a conventional resin sealant: One-year follow up (2005) Int J Paediatr Dent, 15, pp. 44-50Borges, B.C., Silva, P.R., Catelan, A., Aguiar, F.H., Influence of the light curing tip distance and material opacity on selected physical properties of a pit and fissure sealant (2011) Pediatr Dent, 33, pp. 505-509Gomes-Silva, J.M., Torres, C.P., Contente, M.M., Oliveira, M.A., Palma-Dibb, R.G., Borsatto, M.C., Bond strength of a pit-and-fissure sealant associated to etch-and-rinse and self-etching adhesive systems to saliva-contaminated enamel: Individual vs. simultaneous light curing (2008) Braz Dent J, 19, pp. 341-347Perdigão, J., Fundingsland, J.W., Duarte, S., Lopes, M.M., Microtensile adhesion of sealants to intact enamel (2005) Int J Paediatr Dent, 15, pp. 342-348Sabatoski, M.A., Maruo, I.T., Camargo, E.S., Guariza-Filho, O., Tanaka, O.M., Maruo, H., Influence of natural bovine enamel roughness on bond strength after etching (2010) Angle Orthod, 80, pp. 562-569Shimada, Y., Tagami, J., Effects of regional enamel and prism orientation on resin bonding (2003) Oper Dent, 28, pp. 20-2