| dc.description.abstract | Poly methyl methacrylate (PMMA), currently the most widely used resin in dentistry, is less than ideal for meeting the mechanical needs of a denture base due to its low impact and flexural strength, which increases the risk of failure during clinical use. In the first 0 to 4 years of use, as many as 49% of PMMA full dentures cracked. Utilizing a cobalt chromium (Co-Cr) metal base is one approach to lower the risk of denture base fracture, however Co-Cr has disadvantages such the potential to lead to hypersensitivity, aesthetic problems, oral galvanism, heavy dentures, and biofilm adhesion. Compared to other polymers, Polyetheretherketone (PEEK) has better physical and mechanical properties, is much more biocompatible, and weighs less than metal alloys, making this material continue to be developed in the field of dentistry. However, there has been no study looking at the effect of aging on the flexural strength and impact of PEEK as a denture base material. The researcher wanted to evaluate the effect of duration of use using the thermocycling method of 2000 and 5000 cycles which describes 2 and 5 years of use in the oral cavity on the flexural strength and impact of PMMA materials and injection molding PEEK. The purpose of this study was to determine the differences in the flexural and impact strengths of PMMA and PEEK denture bases based on duration of use and to see the effect of duration on the flexural strength and impact of PMMA and PEEK materials. According to ADA specifications No.12, the sample size for flexural strength was 65 mm x 10 mm x 2.5 mm + 0.1 while the sample size for impact strength was 50 mm x 6 mm x 4 mm + 0.1 with a notch depth of 1.2 mm in accordance with ISO standard 1567:1999. The research design was a post test only control group design. Each test group had 7 samples of each PMMA and PEEK material. The samples were divided into three groups: control, 2000 and 5000 thermocycling cycles. Flexural strength testing was carried out using the three point bending method with a universal testing machine. While the impact strength test was carried out by the charpy method using a charpy impact testing machine. From the results of the study, it was found that there was a significant difference in flexural strength between PMMA and PEEK based on the length of use with a value of p=0.0001 (p<0.05) while in the impact strength between PMMA and PEEK based on the length of use, there was a significant difference with a value of p=0. 0001 (p<0.05). In the group testing the effect of length of use using the thermocycling method on the flexural strength of PMMA, there is a significant effect with a p value = 0.0001 (p <0.05) and in the group testing the effect of duration of use using the thermocycling method on the impact strength of PMMA, there is a significant effect with a value of p =0.0001 (p<0.05). In the group testing the effect of length of use using the thermocycling method on the flexural strength of PEEK there was no effect with a p = 0.143 (p>0.05) and in the group testing the effect of duration of use using the thermocycling method on the impact strength of PEEK there was no effect with a value of p = 0.070 (p>0.05). According to the study's findings, PEEK can be used as a base material for dentures that aims to increase flexural strength in the required clinical conditions. | en_US |
