comparison of bond strength of acrylic, composite, and nanocomposite artificial teeth to heat-cure acrylic denture base resin

Objectives: the present study aimed to evaluate the bond strength of heat-cure denture base resin to newly designed iranian artificial acrylic teeth. materials and methods: in this in-vitro experimental study, shear bond strengths of ivoclar acrylic, apple composite, and b-star nanocomposite teeth to heat-cure acrylic denture base resin were compared. a total of 18 samples were selected from each group of teeth. the samples were attached to heat-cure resin according to iso 10477 standard. for the assessment of bond strength, the samples were placed in a universal testing machine and were subjected to shear forces at a speed of 1 mm/minute to record the fracture load. descriptive statistics, including frequency, mean, and standard deviation, were calculated using spss 20 software. two-way analysis of variance was used to compare the shear bond strength of the groups with and without monomers and the studied artificial teeth. results: the mean shear bond strengths of ivoclar acrylic teeth were 392.22±23.76 mpa and 337.11±32.18 mpa with and without adding monomers to the tooth surface, respectively. the mean shear bond strengths were 250.44±29.84 mpa and 238.33±27.28 mpa (without monomers) and 438.33±24.16 mpa and 311.56±32.78 mpa (with monomers) for apple composite and b-star nanocomposite artificial teeth, respectively. conclusion: the greatest shear bond strength was attributed to ivoclar acrylic teeth followed by apple composite and b-star nanocomposite artificial teeth. addition of monomers to the tooth surface significantly strengthened the shear bonding of acrylic base resin to the teeth.