A common type of acrylic resin denture failure is the debonding or fracture of teeth. Painting a less viscous mixture of monomer/powder (acrylic gel) on the teeth before processing may improve performance. Objective: The objective of this study was to compare the tensile bond strengths of an acrylic denture tooth to a heat-processed acrylic denture base using acrylic gels containing 100%, 90%, 80%, and 70% monomer before processing and compared to traditional processing with no added gel (Groups A, B, C, D, and E). Methods: Five teeth were processed for each group. The appropriate acrylic gel was applied on the back of each tooth before packing a heat-polymerized acrylic denture base (Lucitone 199; Caulk/ Dentsply Laboratory Division, York, Pa). Specimens were thermocycled, shaped into dumbbells with a 4 mm neck and sectioned into 1 mm wide slabs with an Isomet 1000 Precision saw. Specimens were mounted on a modified Bencor Multi-T fixture and tested in a universal testing machine; crosshead speed = 1mm/min. Up to five slabs were obtained for each specimen and a mean for each specimen calculated. Data was analyzed with analysis of variance and Duncan's multiple range tests (a=0.05). Results: The means (s.d.) in MPa for each group were A: 20.44 (1.31); B: 12.46 (3.82); C: 20.03 (7.73); D: 25.46 (2.01); E: 14.34 (5.75). Conclusion: The use of an acrylic gel containing 70% monomer exhibited higher tensile bond strengths of teeth to an acrylic resin denture base than using no gel prior to processing.

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