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

Lümkemann, Nina; Eichberger, Marlis und Stawarczyk, Bogna (2017): Different PEEK qualities irradiated with light of different wavelengths: Impact on Martens hardness. In: Dental Materials, Bd. 33, Nr. 9: S. 968-975

Abstract

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. (C) 2017 The Academy of Dental Materials.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0109-5641
• Sprache: Englisch