Abstract
Objective: This study aimed to evaluate the wear resistance of acrylic denture teeth containing silicon dioxide (nano-SiO2) and aluminum dioxide (nano-Al2O3) nanoparticles. Material and Methods: Poly methyl methacrylate (PMMA) denture tooth material was used to denture tooth material was used to fabricate 84 specimens (n=10) containing nano-SiO2 and nano-Al2O3 in concentrations 0.1wt%, 0.3wt%, and 0.5wt% of acrylic powder. A two-body wear testing machine and digital microscope were used to measure the changes in weight loss and surface roughness respectively. One-way ANOVA and pair-wise Tukey’s post-hoc tests were used for data analysis (? = 0.05). Results: Nano-SiO2 modified teeth material demonstrated a significant increase in weight loss in comparison conventional artificial acrylic teeth material (p ? 0.05) while nano- Al2O3 modified teeth material demonstrated non-significant increase in weight loss except for 0.5% subgroup (p ? 0.05). There is no significant differences regarding roughness change after wear simulation among all tested groups (p > 0.05). Conclusion: Nano-Al2O3 nanoparticles exhibit less negative effect than nano-SiO2 so; it could be used with caution if necessary.KeywordsAcrylic denture teeth; Al2O3 nanoparticles; SiO2 nanoparticles; wear resistance; surface roughness.
Highlights
T o fabricate removable complete and partial dentures, artificial teeth with superior surface properties are often necessary for prosthodontics rehabilitation
The results showed that Al2O3 nanoparticles with concentration 1% and 2% increased the transverse strength of Poly methyl methacrylate (PMMA), while nano-Al2O3 with different concentrations did not have significant effect on the surface roughness of PMMA [17]
Mean values and standard deviations (SD) of weight loss for nano-SiO2-modified group were summarized in table III
Summary
T o fabricate removable complete and partial dentures, artificial teeth with superior surface properties are often necessary for prosthodontics rehabilitation. Porcelain teeth have greater hardness, better color stability, exhibit superior resistance to wear than acrylic teeth, they possess some disadvantages such as insufficient bonding to denture base, brittleness, clicking and opposing natural teeth abrasion [3,4]. Acrylic resin teeth were introduced in the early 1930s and are widely used for dentures fabrication because the process is simple and low cost compared to porcelain teeth. Acrylic teeth solved some of porcelain denture teeth’s problems, including better bonding to denture base, less brittleness, reduction of chewing noises, ease of being re-contoured and being re-polished and more natural appearance [5], low wear resistance was still a major concern, since acrylic denture teeth can go through rapid change in occlusal morphology in a short period of time [3]
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