| INTRODUCTION: This study evaluated the effect of denture base acrylic, denture tooth composition, and ridge lap surface treatment on the microtensile bond strength (microTBS) of three different commercially available denture teeth and two injection denture processing systems.;MATERIALS and METHODS: Sixteen experimental groups were formed (n=3), according to denture tooth surface treatment (no treatment or surface treatment recommended by the manufacturer), denture base processing technique and acrylic (SRIvocap- Ivocap Plus or Success-Lucitone 199), and tooth type-composition at bonding interface (BlueLine DCL-PMMA, Portrait IPN-PMMA, Phonares II-PMMA, Phonares II-NHC). Rectangular bar specimens with a cross sectional area of 1mm2 were fabricated and subsequently thermocycled at 10,000 cycles between 5°C and 55°C with 15 sec dwell time. Select specimens underwent microTBS testing in a Universal Testing Machine (Instron) with a 1 kN load cell at 0.5 mm/min crosshead speed. Data were analyzed statistically by two and three-way ANOVAs and Tukey post hoc test (alpha=0.05).;RESULTS: Mean microTBS ranged between 56.2 +/- 5.6 to 60.8 +/- 5.0 (N/mm2) for the Ivocap Plus specimens and 13.3 +/- 5.12 to 60.1 +/- 6.0 (N/mm2) for the Lucitone 199 specimens. Among the Ivocap specimens, BlueLine DCL and Phonares II NHC had significantly higher microTBS than Portrait IPN to Ivocap Plus acrylic. There were no statistically significant differences among Blueline, Phonares PMMA and Phonares NHC, or between Phonares PMMA and Portrait IPN. Within the Luctione 199 specimens, there was a significantly higher microTBS for BlueLine DCL and Phonares II NHC denture teeth with the manufacturer recommended surface treatment when compared to control surface. BlueLine, Portrait, and Phonares PMMA groups achieved significantly higher mean microTBS than the Phonares NHC group. There were no statistically significant differences among BlueLine, Portrait and Phonares PMMA groups.;CONCLUSION: Within the limitations of this experimental study, the results suggest that the type of denture base material, denture tooth composition, and surface treatment have an influence upon the microtensile bond strength between certain types of highly crosslinked denture teeth and high-impact denture base acrylics. |
