Assessing Tensile and Shear Bond Strength between Artificial Acrylic Teeth and Nano-silica Reinforced PMMA Denture Base Material

Document Type : Research Paper


1 Department of Prosthetic Dental Technology, College of Health and Medical Technology, Middle Technical University

2 Department of Prosthodontics Technologies, Institute of Health and Medical Technologies, Middle Technical University, Baghdad, Iraq.


Background: Detachment of artificial teeth from the denture base presents a common clinical issue. To manipulate this problem, silica nanoparticles (SiO2NPS) strengthening was suggested, containing (0, 2.5, 5, 7 wt. %) SiO2NPS to form nanocomposite materials.
Objective: To evaluate the tensile and shear bond strength between acrylic teeth and denture base (PMMA) reinforced with SiO2NPS.
MATERIALS AND METHODS: 60 maxillary central incisors & 60 mandibular molars were selected to be bonded to cylindrical shape specimens (diameter of 5mm and length of 20 mm) fabricated from heat-cured Poly (methyl methacrylate) (PMMA) reinforced with SiO2NPS
RESULTS: Tensile and shear bond strength tended to increase significantly (P ˂ 0.001) in all groups reinforced with SiO2NPS compared with the control group. Among the reinforced groups, the tensile bond strength increased significantly (P ˂ 0.001) at 2.5% followed by 5.0 %, 7.0 %, and least in the control group. Moreover, the shear bond strength values of the 2.5 wt.% and 5 wt.% modified samples were significantly higher than those of the control (P ˂ 0.001), while the 7wt.% group was lower compared to the control group.
CONCLUSION: Incorporation of SiO2NPS into the acrylic resin significantly increased the tensile bond strength for all tested groups (2.5 %, 5 %, and 7%) compared with the control group, this increase was concentration-dependent.