TY - JOUR ID - TI - Effects of Recycling-PEEK Waste from CAD-CAM on Surface Hardness and Roughness of PMMA AU - Aseel Hayder Salim AU - Saja Ali Muhsin PY - 2020 VL - 7 IS - 1 SP - 22 EP - 29 JO - Journal of Oral and Dental Research مجلة طب الفم والاسنان SN - 23106417 AB - Background Being health care professionals, technicians should be aware of regarding safe disposal of biomedical waste and the recycling of dental materials to minimize biohazards to the environment. Objectives The aim of the present study was to assess the PMMA mechanical properties after recycling and reuse of waste Polyetheretherketone (PEEK) material from the CAD-CAM production method as effective filler.Materials and Methods The PEEK fiber was collected from the CAM machine after the milling procedure. Then, standard sieves of ISO standardization no. 40, 60 and 100 were used respectively to achieve a fine particle grit size of 150μm. The PEEK of 1% wt. was added to the PMMA resin base of 99% wt., and PEEK of 2% wt. was added to the PMMA resin base of 98% wt. to achieve a PMMA/PEEK composite of two different filler percentage to compare with the PMMA with no additives. The conventional heat-curing method was applied using a water bath to polymerize the disc specimens for both surface roughness and hardness tests. Study data were analyzed via One-way ANOVA(post-hoc/Tukey test) performed at a significant P-value of (p≤0.05) and confidence level of 95%. Results After comparing the results, a significant difference in the surface hardness and roughness of PMMA/2%PEEK composites was noticed comparing to other tested groups (p≤0.05). Conclusion The recycling of PEEK waste from CAD-CAM production method and reuse it as dental filler at 1% and 2% wt. incorporating PMMA reduced the surface roughness and enhanced the surface hardness of PMMA denturebase material.

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