Polishing performance of dental milled polyetheretherketone: An in vitro study

doi:10.3877/cma.j.issn.1674-1366.2021.05.004

Abstract

Abstract:

Objective

In this in vitro study, the effect of polishing protocols on the surface morphology and roughness of the dental-milled polyetheretherketone (PEEK) was evaluated, compared with the clinical-milled polymethylmethacrylate (PMMA) for crowns and bridges, so as to confirm whether the dental-milled PEEK can meet clinical requirements.

Methods

Two kinds of milled specimens were included in this study: dental milled PEEK (PT group) as the test group and clinical-milled PMMA for crowns and bridges (R group) as the control group. A total of seven specimens of each material were milled as cylinders with the diameter of 10 mm and the height of 2 mm. All specimens were ground using SiC paper and polished with the same polishing protocol. Among the seven specimens, two were randomly chosen. A scanning electron microscope (SEM) was used to observe the surface morphology of the specimens before and after polishing. The left five specimens were subjected to atomic force microscope (AFM) to measure the surface roughness (Ra) before and after polishing. Paired t-test was used to compare the mean values of Ra before and after polishing in each group. Independent sample t-test was used for comparison between the two groups.

Results

After polishing, each group showed a more regular surface. The Ra value of PT group decreased from (0.047 ± 0.016) μm to (0.022 ± 0.003) μm (t_before = 1.075, P_before = 0.309; t_after = 3.562, P_after = 0.070) . The Ra value of R group decreased from (0.036 ± 0.011) μm to (0.018 ± 0.008) μm (t_{PT group} = 5.851, P_{PT group}<0.001; t_{R group} = 5.166, P_{R group}<0.001) . No statistical difference in Ra value was found between groups after polishing. There was statistical difference in Ra value for each group. The Ra value of each group decreased after polishing.

Conclusions

Dental-milled PEEK could get lower surface roughness after polishing. No statistical difference in Ra values was observed between the dental-milled PEEK and the clinical-milled PMMA for crown and bridge after polishing. Dental-milled PEEK can meet the clinical requirements.

Key words: Polymers, Dental polishing, CAD-CAM, Surface properties

Ruijin Wang, Jiaqi Zhang, Yingjie Yi, Guofeng Wu. Polishing performance of dental milled polyetheretherketone: An in vitro study[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2021, 15(05): 278-283.

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References 25

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