J M Powers1, W J Finger, J Xie. 1. Department of Basic Sciences-Oral Biomaterials, University of Texas-Houston Dental Branch 77030-3402, USA.
Abstract
PURPOSE: The purpose of this in vitro study was to evaluate the bond strengths of a bonding agent and composite resin system to human enamel and dentin treated with five contaminants (saliva, plasma, zinc oxide-eugenol cement, noneugenol zinc oxide cement, and handpiece lubricant) using air, moisture, and water as controls. MATERIALS AND METHODS: A commercial bonding agent (Gluma 2000; Bayer AG, Dormagen, Germany) and its composite (Pekafill; Bayer AG) were applied to tooth structure under two conditions (contaminated and re-etched). Samples were debonded in tension after 24 hours using an inverted, truncated cone bond test. RESULTS: Among the controls, the highest bond strengths were obtained to enamel (20 MPa) and dentin (12 MPa) with air drying. Contaminants lowered the bond strength by 20% to 100%. Re-etching without additional mechanical preparation resulted in bond strengths similar to the air control. CONCLUSIONS: Bond strength of Gluma 2000/Pekafill to tooth structure is sensitive to common forms of contamination but can be improved by re-etching after contamination occurs.
PURPOSE: The purpose of this in vitro study was to evaluate the bond strengths of a bonding agent and composite resin system to human enamel and dentin treated with five contaminants (saliva, plasma, zinc oxide-eugenol cement, noneugenol zinc oxide cement, and handpiece lubricant) using air, moisture, and water as controls. MATERIALS AND METHODS: A commercial bonding agent (Gluma 2000; Bayer AG, Dormagen, Germany) and its composite (Pekafill; Bayer AG) were applied to tooth structure under two conditions (contaminated and re-etched). Samples were debonded in tension after 24 hours using an inverted, truncated cone bond test. RESULTS: Among the controls, the highest bond strengths were obtained to enamel (20 MPa) and dentin (12 MPa) with air drying. Contaminants lowered the bond strength by 20% to 100%. Re-etching without additional mechanical preparation resulted in bond strengths similar to the air control. CONCLUSIONS: Bond strength of Gluma 2000/Pekafill to tooth structure is sensitive to common forms of contamination but can be improved by re-etching after contamination occurs.
Authors: Lilliam Marie Pinzon; John M Powers; Kathy L O'Keefe; Vladimir Dusevish; Paulette Spencer; Grayson W Marshall Journal: Odontology Date: 2011-04-23 Impact factor: 2.634
Authors: Ellen Cristina de Carvalho Mendonça; Samuel Nilo Vieira; Fernando Aparecido Kawaguchi; John Powers; Adriana Bona Matos Journal: Eur J Dent Date: 2010-07