Shear bond strength of tooth-colored indirect restorations bonded to coronal and cervical enamel

Oper Dent. 2005 Jul-Aug;30(4):468-73.

Abstract

This study evaluated the shear bond strength of resin inlays bonded with resin cement to cervical and mid-coronal enamel. Two regions of enamel, cervical and mid-coronal, were chosen from the buccal surface of extracted molars. Composite "inlays" (Estenia, Kuraray Medical Inc) were fabricated indirectly and cemented with a dual-cured resin cement (Panavia Fluoro Cement II, Kuraray Medical Inc). The resin cement was cured with or without light irradiation for 30 seconds. After 24-hours or one-week's storage in 37 degrees C water, the bonded inlays were subjected to a microshear bond test, whereby a shear force was applied to the inlays at a crosshead speed of 1 mm/minute. The data were statistically analyzed using ANOVA and Fisher's PLSD test, with significance defined as p<0.05. Observations using confocal laser scanning microscopy were also performed after debonding the specimens. The light-cure method showed significantly higher bond strengths to both enamel regions compared with self-cure, especially at 24 hours (p<0.05). However, bond strength of the self-cured resin cement significantly improved after one week's storage (p<0.05; cervical enamel: p=0.022, midcoronal enamel: p=0.0024). The cervical enamel showed significantly lower bonding than midcoronal enamel (p<0.05), except for the self-cured specimens at 24 hours. Light curing of resin cement is a better choice than self-curing for luting of indirect restorations. The bond strength of indirect restorations to cervical enamel was lower than mid-coronal enamel.

Publication types

  • Comparative Study

MeSH terms

  • Composite Resins / chemistry*
  • Dental Bonding*
  • Dental Enamel / ultrastructure*
  • Humans
  • Inlays*
  • Light
  • Materials Testing
  • Methacrylates / chemistry
  • Methacrylates / radiation effects
  • Microscopy, Confocal
  • Polyurethanes / chemistry
  • Polyurethanes / radiation effects
  • Resin Cements / chemistry
  • Resin Cements / radiation effects
  • Shear Strength
  • Stress, Mechanical
  • Temperature
  • Time Factors
  • Tooth Cervix / ultrastructure*
  • Tooth Crown / ultrastructure*

Substances

  • Composite Resins
  • Methacrylates
  • Panavia-Fluoro
  • Polyurethanes
  • Resin Cements
  • urethanetrimethacrylate