Comparison of shear bond strength of light-cured resin-modified glass ionomer and moist insensitive primer on contaminated enamel

Abstract

Despite rapid developments in adhesive technology, contamination of bonding surfaces remains a major problem. The aim of this study was to evaluate the influence of contamination on shear bond strength of two adhesive systems: resin-modified glass ionomer cement (Fuji Ortho LC; GC America Corp) and Moist Insensitive Primer (Transbond MIP, 3M Unitek) combination with Transbond XT (light-activated), under different enamel conditions. Metal brackets were bonded to the buccal surfaces of 42 human premolars. The total sample was divided into 6 groups (n = 7 teeth) and brackets were bonded with one of the 2 adhesives under 3 enamel surface conditions: (1) dry (2) saliva-contaminated (3) saliva and blood-contaminated. The shear bond strength was tested using Universal Strength Tester Autograph Shimadzu Corp. There was no significant difference in the shear bond strength between dry, saliva, and saliva-blood contamination bonded with MIP combined Transbond XT. There were significant differences in the shear bond strengths between dry and saliva -blood contaminated enamel bonded with Fuji Ortho LC. In conclusion, Fuji Ortho LC is not recommended for clinical bonding application under saliva-blood contaminated enamel conditions.

Effects of Curing Mode on the Bond Strength of Resin-Modified Glass Ionomer Cements

“…After biting for 5 minutes, cementation of the restoration is complete. Te process of light curing could shorten the occlusion time for patients and allow easy removal of the excess RMGIC, but there are few reports describing whether it can improve the bond strength [9][10][11]. Our previous studies have shown that the curing mode of dual-cured RMGIC can directly afect the fexural strength because the fexural strength in the lightcuring mode is higher than that in the chemical-curing mode and also could improve the mechanical chimerism of RMGIC [12].…”