Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 3 2019 01 30 166 172 EN Tahereh Ghaffari Gharebagh Department of Prosthodontics, Dental Faculty of Tabriz University of Medical Sciences, Tabriz, Iran Fahimeh Hamedirad Dental Materials Research Center, Health Research Institute, Babol University of Medical Sciences. Babol, Iran Keyvan Miruzadeh Dentist, Dental Faculty of Tabriz University of Medical Sciences, Tabriz, Iran 2018 06 26 2019 01 05 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. https://fid.tums.ac.ir/index.php/fid/article/view/2666 https://fid.tums.ac.ir/index.php/fid/article/download/2666/1754