The effect of ageing in simulated mouth conditions on bond strength between acrylic teeth and denture base resins was evaluated. Bonding was tested in tension according to ADA specification No. 15. The data was analysed using two-way analysis of variance and Tukey test at P < 0.05. The ageing effect on bond strength became significant after six months of exposure when bonding of acrylic teeth to heat-cured and autopolymerised resins was significantly reduced, P = 0.001 and P = 0.03 respectively. The bond strength value of the autopolymerised resin to acrylic tooth after one year in test environment was half the acceptable value of 31.0 MPa suggested by the ADA specification No. 15, whereas tooth bond strength to heat-cured resin was acceptable even after one year of exposure.
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