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

作者：Luemkemann Nina; Eichberger Marlis; Stawarczyk Bogna^*

来源：Dental Materials, 2017, 33(9): 968-975.

DOI：10.1016/j.dental.2017.06.005

• PEEK
• Surface properties
• Martens hardness
• Wavelengths

Objectives. To 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%.
Methods. For Martens hardness (HM) measurements, 40 specimens of each PEEK quality were fabricated and air-abraded with 50 mu m 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 540 s using light units with different wavelength: Elipar S10 (430-480 nm), Eye Volution MAX (385-390 nm + 465-470 nm), Translux CL (380-500 nm) and bre.Lux Power Unit (370-500 nm). HM parameters of 10 human teeth were measured initially on enamel and dentin. Data was analysed using 3-way ANOVA with partial eta-squared (eta p(2)) and post-hoc Tuckey-HSD-test (p < 0.05).
Results. PEEK qualities followed by the wavelength showed the highest effect on Martens hardness (p < 0.013). PEEK/>30% (197.35 +/- 19.9 N/mm(2)), followed by PEEK/20% (191.45 +/- 15.49 N/mm(2)) showed significantly higher values for HM than PEEK/0% (189.55 +/- 16.89 N/mm(2)). PEEK/>30% (5.49 +/- 0.4 kN/mm) and PEEK/20% (5.38 +/- 0.26 kN/mm(2)) presented higher indentation modulus (Err) than PEEK/0% (4.77 +/- 0.36 kN/mm(2)). Irradiated with wavelength of 430-480 nm (PEEK/0%: 193.28 N/mm(2), PEEK20%: 198.83 N/mm(2), PEEK/>30%: 200.5 N/mm(2)) indicated higher HM compared to specimens irradiated with 380-500 nm (PEEK/0%: 186.63 N/mm(2), PEEK20%: 191.05 N/mm(2), PEEK/>30%: 196.13 N/mm(2)). Irradiation using 430-480 nm (PEEK/0%: 4.95 kN/mm(2), PEEK20%: 5.52 kN/mm(2), PEEK/>30%: 5.59 kN/mm(2)) and 370-500 nm (PEEK/0%: 4.92 kN/mm(2), PEEK20%: 5.43 kN/mm(2), PEEK/>30%: 5.53 kN/mm(2)) indicated higher En. values compared to specimens irradiated with 380-500 nm (PEEK/0%: 4.72 kN/mm(2), PEEK20%: 5.34 kN/mm(2), PEEK/>30%: 5.47 kN/mm(2)). Duration of irradiation presented no impact on results. Enamel (HM: 2263.6 +/- 405.16,E-IT: 63.16 +/- 19.24) and dentin (HM: 468.2 +/- 30.77 N/mm(2), E-IT: 14.14 +/- 4.59 kN/mm(2)) presented significantly higher HM and E-IT than the tested PEEK qualities (p < 0.001).
Significance. Irradiation 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.

• 出版日期2017-9