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Effect of Individual or Simultaneous Curing on Sealant Bond Strength

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Purpose: The objective of this study was to assess the shear bond strength of resin sealants to saliva-contaminated and noncontaminated enamel, comparing 2 curing protocols: (1) individual light-curing of the intermediate bonding agent layer and the sealant; or (2) simultaneous curing of both materials.

Methods: Seventy-two enamel test surfaces were obtained from 24 third molars and randomly assigned to 2 groups (N=36): (A) saliva-contaminated; (B) noncontaminated. Each group was divided into 3 subgroups, according to the bonding technique: (1) Prime&Bond and Fluroshield were light cured separately; (2) Prime&Bond and Fluroshield were light cured together; (3) Fluroshield was applied alone. Shear bond strength was tested at a crosshead speed of 0.5 mm/minute.

Results: Means (MPa) were: IA-15.61(±4.74); IIA-15.71(±6.18); IIIA-13.83(±1.50); IB-24.73(±4.34); IIB-22.41(±4.16); IIIB-18.20(±3.58). Statistical analysis revealed that overall bond strength to saliva-contaminated enamel was remarkably lower (P<.05) than that recorded under dry conditions. In both contaminated and noncontaminated groups, significantly higher shear bond strength (P<.05) was observed when the bonding agent was applied underneath the sealant. Comparing the curing protocols for contaminated specimens, no statistically significant difference (P>.05) was observed between individual and simultaneous curing. Conversely, for noncontaminated specimens, bond strength was higher and statistically different (P<.05) when the materials were light cured separately.

Conclusions: Individual or simultaneous curing of the intermediate bonding agent layer and the resin sealant does not seem to affect bond strength to saliva-contaminated enamel. When dry, noncontaminated conditions are maintained, however, the intermediary and the sealing materials should preferably be light cured separately.
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Document Type: Research Article

Publication date: January 1, 2005

More about this publication?
  • Acquired after the merger between the American Society of Dentistry for Children and the American Academy of Pediatric Dentistry in 2002, the Journal of Dentistry for Children (JDC) is an internationally renowned journal whose publishing dates back to 1934. Published three times a year, JDC promotes the practice, education and research specifically related to the specialty of pediatric dentistry. It covers a wide range of topics related to the clinical care of children, from clinical techniques of daily importance to the practitioner, to studies on child behavior and growth and development. JDC also provides information on the physical, psychological and emotional conditions of children as they relate to and affect their dental health.
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