Shear bond strength of pit-and-fissure sealants to saliva-contaminated and noncontaminated enamel.
OBJECTIVE
The purpose of this study was to investigate the shear bond strength of 2 resin-based pit-and-fissure sealants--Clinpro and Fluroshield--to saliva-contaminated and noncontaminated enamel.


METHODS
Forty buccal halves of permanent molar crowns were individually embedded in polyester resin and ground with wet silicone carbide papers to obtain flat enamel surfaces. The specimens were randomly assigned to 2 groups: (A) without contamination; and (B) contaminated with 0.01 ml of fresh human saliva. Each group was divided into 2 subgroups (N=10), according to the sealant applied: (1) Clinpro; and (2) Fluroshield. Shear bond strength was tested at a crosshead speed of 0.5 mm/min. Failure mode was assessed.


RESULTS
Means (MPa) were: (1) A1=7.66 +/- 3.12; A2=12.39 +/- 4.34; (2) B1=5.05 +/- 1.44; B2=10.44 +/- 2.35. Data were submitted to analysis of variance and Scheffé's statistical test (P<.05). There was a statistically significant difference (P<.05) between both the sealants and the experimental conditions analyzed. Fluroshield provided higher bond strength and was different from Clinpro (P<.05) in the absence of contamination. Within the saliva-contaminated group, however, no statistically significant difference (P>.05) was observed between the tested materials.


CONCLUSIONS
It may be concluded that, under dry conditions, the filled pit-and-fissure sealant (Fluroshield) yielded better bonding performance. Salivary contamination undermined the adhesion of both materials to enamel and resulted in lower bond strengths.
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil. borsatto@forp.usp.br
Juliana Machado
JM
Barroso
Carolina Paes
CP
Torres
Fernanda Campos Rosetti
FC
Lessa
Jesus Djalma
JD
Pécora
Regina Guenka
RG
Palma-Dibb
Maria Cristina
MC
Borsatto
D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D008963:Molar; D010895:Pit and Fissure Sealants; D011140:Polyurethanes; D012463:Saliva; D033081:Shear Strength
C500418:Clinpro Sealant; D003188:Composite Resins; D010895:Pit and Fissure Sealants; D011140:Polyurethanes; C086661:Fluoroshield; D017438:Bisphenol A-Glycidyl Methacrylate