Objectives: Bond between different denture teeth and denture base resins was determined by a modified fracture test.
Methods: 192 cylindrical specimens (height 30mm, diameter 25mm) of the heat-cured denture base resin SR Ivocap Plus (Ivoclar-Vivadent), the cold-cured denture base resin Probase Cold (Ivoclar-Vivadent) and the light curing material Eclipse® (Dentsply) combined with 2 different acrylic denture teeth (Vita Lingoform, VITA, G and SR Orthotyp DCL, Ivoclar-Vivadent, FL), were divided in four groups with different surface–conditioning methods of the base surface of the teeth (C = control, no surface conditioning, SB = sand blasting, SBB = sand blasting+bonding agent, SP = 50-grit sandpaper). After 14 days of storage in distilled water (37°C) all specimens were loaded using a universal testing machine (Zwick 1446, v=2mm/min) until failure occurred. Statistical analysis was performed using the Mann-Whitney U- and Kruskal Wallis-Test (p = 0.05).
Results:
Fracture force median [N]: SR Ivocap Plus/Probase Cold/Eclipse | C | SB | SBB | SP |
Vita Lingoform (VITA) | 933/496/23 | 1211/842/427 | 1061/837/393 | 937/749/255 |
SR Orthotyp DCL (Ivoclar-Vivadent) | 703/229/333 | 573/708/464 | 692/717/437 | 757/551/358 |
Conclusions: All specimens showed a mixed adhesive/cohesive failure mode. The significantly highest shear bond strength was found for the denture base material SR Ivocap Plus. Lowest shear bond strength was found for Eclipse®. Tooth bond is significantly affected by the surface-conditioning method, the applied denture base resin and the applied acrylic tooth. Conditioning of the base surface of the teeth prior to denture base processing is highly recommended.