Different PEEK qualities irradiated with light of different wavelengths: Impact on Martens hardness

Publication date: Available online 27 June 2017
Source:Dental Materials
Author(s): Nina Lümkemann, Marlis Eichberger, Bogna Stawarczyk
ObjectivesTo assess the impact of irradiation on Martens hardness parameters of different PEEK qualities filled with titanium dioxide (TiO2), namely PEEK/0%, PEEK/20%, and PEEK/>30%.MethodsFor Martens hardness (HM) measurements, 40 specimens of each PEEK quality were fabricated and air-abraded with 50μm Al2O3. HM parameters of PEEK specimens were measured initially and stepwise after irradiating for 5, 10, 20, 30, 40, 60, 80, 100, 180, 360 and 540s using light units with different wavelength: Elipar S10 (430–480nm), EyeVolutionMAX (385–390nm+465–470nm), Translux CL (380–500nm) and bre.Lux Power Unit (370–500nm). HM parameters of 10 human teeth were measured initially on enamel and dentin. Data was analysed using 3-way ANOVA with partial eta-squared (ηP²) and post-hoc Tuckey-HSD-test (p<0.05).ResultsPEEK qualities followed by the wavelength showed the highest effect on Martens hardness (p<0.013). PEEK/>30% (197.35±19.9N/mm²), followed by PEEK/20% (191.45±15.49 N/mm²) showed significantly higher values for HM than PEEK/0% (189.55±16.89N/mm²). PEEK/>30% (5.49±0.4kN/mm) and PEEK/20% (5.38±0.26kN/mm²) presented higher indentation modulus (EIT) than PEEK/0% (4.77±0.36kN/mm²). Irradiated with wavelength of 430–480nm (PEEK/0%: 193.28N/mm², PEEK20%: 198.83N/mm², PEEK/>30%: 200.5N/mm²) indicated higher HM compared to specimens irradiated with 380–500nm (PEEK/0%: 186.63N/mm², PEEK20%: 191.05N/mm², PEEK/>30%: 196.13N/mm²). Irradiation using 430–480nm (PEEK/0%: 4.95kN/mm², PEEK20%: 5.52kN/mm², PEEK/>30%: 5.59kN/mm²) and 370–500nm (PEEK/0%: 4.92kN/mm², PEEK20%: 5.43kN/mm², PEEK/>30%: 5.53kN/mm²) indicated higher EIT values compared to specimens irradiated with 380–500nm (PEEK/0%: 4.72kN/mm², PEEK20%: 5.34kN/mm², PEEK/>30%: 5.47kN/mm²). Duration of irradiation presented no impact on results. Enamel (HM: 2263.6±405.16, EIT: 63.16±19.24) and dentin (HM: 468.2±30.77N/mm², EIT: 14.14±4.59kN/mm²) presented significantly higher HM and EIT than the tested PEEK qualities (p<0.001).SignificanceIrradiation with different wavelength impacted HM parameter. The increase of TiO2 percentage in PEEK matrix improved the HM parameter. However, PEEK showed significantly lower HM parameter than human teeth.



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