A short- and long-term shear bond strength study using acids of varying dilutions on bovine dentine.
OBJECTIVE
The purpose of this study was to evaluate the short-(24 h) and long-(180 day) term shear bond strengths of resin to bovine dentine etched with varying dilutions of aqueous solutions of phosphoric and maleic acids.


METHODS
Bovine dentine surfaces were prepared using water irrigated #600 grit SiC paper. The dentine surfaces were etched in groups of 10 teeth using various dilutions of phosphoric or maleic acid. Using the Scotchbond Multipurpose System (SBMP; 3M Co., MN, USA) and a wet technique the etched surfaces were primed and unfilled bonding resin (UBR) was applied to the dentine surface within the confines of a gelatin cylinder. A cylinder of filled resin (Z 100; 3M Co., MN, USA) was then photocured and the specimens were then stored in water for 24 h or 180 days prior to shear bond testing to failure.


RESULTS
The results showed that high bond strengths were recorded using acids which were more dilute than those commercially available. There were also indications that phosphoric acid is not the etching acid of choice for the SBMP system.


CONCLUSIONS
The results of this study showed that high bond strengths can be achieved in dentine using etching acids which are more dilute than those commercially available. Maleic acid appears to be the etchant of choice for the SBMP system.
Chan
A R
AR
Department of Paediatric Dentistry, University of Toronto, Ontario, Canada.
Titley
K C
KC
Chernecky
R
R
Smith
D C
DC
D000134:Acid Etching, Dental; D000818:Animals; D002244:Carbon; D017554:Carbon Compounds, Inorganic; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008298:Maleates / Q000008:administration & dosage* / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000008:administration & dosage* / Q000737:chemistry; D019279:Resin Cements; D017655:Silicon Compounds; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry
D017554:Carbon Compounds, Inorganic; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008298:Maleates; D008768:Methylmethacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D017655:Silicon Compounds; C083568:Z100 composite resin; D002244:Carbon; D012822:Silicon Dioxide; C030272:maleic acid; D015040:Zirconium; C022088:silicon carbide