Neutralizing phosphoric acid in the acid etch resin technique.
The use of an alkaline wetting agent, used to neutralize phosphoric acid in the acid etch technique, was investigated with respect to improving the bond strength and microleakage behaviour of composite resin. The alkaline wetting agent has been shown to prevent the accumulation of calcium biphosphates, as a result of secondary recrystallization of hydroxyapatite, within the depths of etched enamel. To examine the influence of the alkaline wetting agent on bond strength, composite cylinders were prepared on enamel surfaces of extracted third molar teeth and tested for shear bond strength. Microleakage behaviour was observed on class V oval preparations in the cervical thirds of extracted third molars using a dye penetration technique. No significant improvement in shear bond strength was demonstrated with the alkaline wetting agent over conventional acid etching. In addition, the microleakage observed following the use of the alkaline wetting was characteristic of that for conventional acid etching.
Kellar
M
M
Department of General Dentistry, Wilford Hall USAF Medical Center, Texas.
Duke
E S
ES
D000134:Acid Etching, Dental / Q000379:methods*; D000180:Acrylic Resins; D000468:Alkalies / Q000494:pharmacology*; D004396:Coloring Agents; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure*; D003763:Dental Leakage / Q000175:diagnosis*; D006801:Humans; D010756:Phosphoric Acids / Q000037:antagonists & inhibitors*; D013314:Stress, Mechanical; D013501:Surface-Active Agents / Q000494:pharmacology
D000180:Acrylic Resins; D000468:Alkalies; D004396:Coloring Agents; D003188:Composite Resins; D010756:Phosphoric Acids; D013501:Surface-Active Agents