Shear bond strength of resin to acid/pumice-microabraded enamel.
The effect of enamel microabrasion techniques consisting of either 18% hydrochloric acid in pumice or a commercially available abrasive/10% hydrochloric acid mixture, PREMA, on composite/enamel shear bond strengths was investigated. Sixty extracted third molars had the bonding surface flattened and were divided into six treatment groups (n=10) with the enamel treated prior to bonding as follows: Group 1-- untreated; Group 2--37% phosphoric acid etched for 30 seconds; Group 3--18% hydrochloric acid/pumice mixture applied for five 20-second treatments; Group 4--similar to Group 3 with additional 37% phosphoric acid etch; Group 5--treated with PREMA compound applied for five 20-second treatments; Group 6--similar to Group 5 treatment with additional 37% phosphoric acid. Herculite XR composite resin was then bonded to all samples using a VLC unit. Samples were tested in shear, and fractured enamel surfaces were evaluated using light microscopy to determine the enamel-to-resin failures. Resin bond strengths to microabraded and H3PO4-etched enamel were similar to bond strengths of untreated H3PO4-etched enamel and were significantly better than bond strengths to PREMA-treated or unetched enamel.
Royer
M A
MA
National Naval Dental Center, Naval Dental School, Bethesda, MD 20889-5602, USA.
Meiers
J C
JC
D000134:Acid Etching, Dental / Q000379:methods*; D000704:Analysis of Variance; D045424:Complex Mixtures; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D003802:Dentifrices; D006801:Humans; D006851:Hydrochloric Acid; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids; D019279:Resin Cements; D017640:Silicates; D013499:Surface Properties
D045424:Complex Mixtures; D003188:Composite Resins; D003802:Dentifrices; D010756:Phosphoric Acids; C070504:Prema; D019279:Resin Cements; D017640:Silicates; C065770:Herculite XR; C030242:phosphoric acid; C005144:pumice; D006851:Hydrochloric Acid