Influence of pH of different adhesive systems on the polymerization of a chemically cured composite resin
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Data
2005
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The purpose of this study was to investigate the effect of pH of different adhesive systems on the polymerization of a chemically cured
composite resin (Adaptic - AD), by means of tensile bond strength testing. The adhesive systems tested were: ARM, Prime & Bond 2.1
(PB), Scotchbond Multi Purpose (SMP) and Single Bond (SB). Bond strength at the resin/adhesive system/resin interface was assessed.
Five groups (n=5) were formed, according to following configuration: G1: AD/ARM/AD; G2: AD/PB/AD; G3: AD/SMP/AD; G4:
AD/SB/AD; G5: AD/AD (no adhesive). A two-mold stainless steel matrix with a cone-shaped opening (1-mm-thick; 4 mm in diameter)
was used to obtain resin discs. AD resin was inserted into the first mold, left-self curing and an adhesive layer was applied onto resin
surface and light-cured. The second mold was assembled over the first and was filled with the resin. After 10 min, this setting was loaded
in tension in a universal testing machine running at a crosshead speed of 0.5 mm/min. Data were submitted to one-way ANOVA and
Tukey’s test (p<0.05). Bond strength means (kgf) were: G1: 15.23 ± 4.1; G2: 0.00 ± 0.0; G3: 16.96 ± 2.4; G4: 10.08 ± 2.7; G5: 15.44
± 0.9. There were statistically significant differences (p<0.05) between G2-G1; G2-G3; G2-G4; G4-G1; G4-G3. The systems with the
lowest pHs (PB and SB) yielded the lowest bond strength. The findings of this in vitro study demostrates that the pH of adhesive
systems influences the polymerization and bond strength of chemically cured resin materials. The low pH simplified adhesive systems
showed distinct degrees of incompatibility with the chemically cured resin, when compared to the conventional adhesive systems.
Descrição
Palavras-chave
Adhesive systems, pH, Chemically cured resin, Tensile bond strength
Citação
FRANCO, Eduardo Batista et al. Influence of pH of different adhesive systems on the polymerization of a chemically cured composite resin. Brazilian Dental Journal, Bauru, v. 16, n. 2, p. 107-111, 2005.