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The Effect Of CAD/CAM Waste on Mechanical Properties of Heat Cure Acrylic Resin | ||
| Tikrit Journal for Dental Sciences | ||
| Volume 10, Issue 2, December 2022, Pages 197-204 PDF (543.23 K) | ||
| DOI: 10.25130/tjds.10.2.13 | ||
| Author | ||
| Dalia Abdul Reda Sadiq* | ||
| Department of Prosthetic Dental Technology, College of Health and Medical Techniques, Middle Technical University, Baghdad, Iraq | ||
| Abstract | ||
| Background: Being healthcare professionals, technicians must be aware of the safe disposal of biomedical waste and the recycling of dental materials to reduce biological risks to the environment. Objectives: Aim of the current study to evaluation the PMMA surface roughness and hardness after recycling and reuse of waste zirconia material from the CAD/CAM production method as effective filler. Materials and Methods: The Zirconia fiber was collected from the CAM machine after the milling procedure. Then, standard sieves for ISO standardization no. 40, 60 and 100 were used respectively to reach a fine grain size of 150μm. Zirconia of 1% wt. it was added to the PMMA resin base of 99% wt., Zirconia of 3% wt. it was added to the PMMA resin base of 97% wt and Zirconia at 5% wt. it has been added to PMMA resin base of 95% wt. to reach a PMMA/Zirconia composite of three different filler ratios then compared with Polymethyl methacrylate without additives. The conventional heat-curing method using a water bath was applied to polymerize the disc samples for both surface roughness and hardness tests. The data of this study are analyzed by One-way ANOVA (post-hoc/Tukey test) performed at a significant P-value of (p≤0.05) and a 95%confidence level. Results: After comparing the results, a significant difference was observed in the surface roughness and hardness of PMMA/5% Zirconia composites compared to other tested groups (p≤0.05). Conclusion: The 1%, 3% and 5% wt. of Zirconia -fibers as a filler would be an effective percentage to decrease the surface roughness of the PMMA 5% wt. of Zirconia -fibers as a filler would be an effective percentage to increase the surface hardness of the PMMA. | ||
| Keywords | ||
| surface hardness; surface Roughness; CAD-CAM | ||
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