T.R. MENG, Jr., Creighton University, Omaha, NE, USA, and M.A. LATTA, Creighton University, Omaha, NE, USA The abrasion resistance of denture teeth is important for maintaining vertical dimension. Objective: The purpose of this in vitro study was to compare the localized wear of three different types of denture teeth. Materials and Methods: New Hue Plastic, Portrait IPN (Dentsply/Trubyte) and Blue Line DCL (Ivoclar) molar denture teeth were mounted in custom fixtures and polished using silicon carbide papers to a 4000 grit finish. The fixtures were mounted in a Leinfelder wear machine equipped with a conical stylus tip to simulate localized wear. A slurry of unplasticized polymer beads (44 micron average particle size) was used as food bolus analog. Specimens were subjected to 250,000 wear cycles. Pre and post wear surface profiles were generated using an MTS 3-D profilometer. The total volume loss and maximum depth were calculated using ANSUR software and statistical analysis was accomplished using ANOVA and Fisher's LSD post-hoc test. Results: | Posterior Tooth | Volume Loss (mm3) | Maximum depth (microns) | | IPN | 0.059 ± 0.016 * | 146.3 ± 24.4 * | | DCL | 0.064 ± 0.018 * | 161.3 ± 19.5 *+ | | New Hue | 0.081 ± 0.018 | 177.7 ± 15.1+ |
Groups with a common symbol were statistically similar (p>0.05). IPN and DCL exhibited statistically similar volume loss (p>0.05) but less than New Hue (p<0.05). Conclusion: There were differences in the in-vitro localized wear of the denture teeth tested. Supported by Ivoclar, Dentsply and the Health Future Foundation. |