Surface characterisation and bonding of Y-TZP following non-thermal plasma treatment |
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Authors: | Guilherme B Valverde Paulo G Coelho Malvin N Janal Fábio Cesar Lorenzoni Ricardo M Carvalho Van P Thompson Klaus-Dieter Weltemann Nelson RFA Silva |
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Institution: | 1. Piracicaba School of Dentistry-UNICAMP-Brazil, Department of Prosthodontics and Operative Dentistry, Tufts University, School of Dental Medicine, Boston, MA, USA;2. Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA;3. Department of Epidemiology and Health Promotion, New York University College of Dentistry, New York, USA;4. Department of Oral Biological and Medical Science, Division of Biomaterials, University of British Columbia, Faculty of Dentistry, Vancouver, BC, Canada;5. Leibniz Institute for Plasma Science and Technology, Greifswald, Germany;6. Department of Restorative Dentistry, Federal University of Minas Gerais-UFMG, Belo Horizonte, MG, Brazil |
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Abstract: | Objectives(1) To chemically characterise Y-TZP surface via X-ray photoelectron spectroscopy (XPS) and evaluate the surface energy levels (SE) after non-thermal plasma (NTP). (2) To test the microtensile bond strength (MTBS) of Y-TZP bonded to cured composite disks, after a combination of different surface conditioning methods.MethodsTwenty-four Y-TZP discs (13.5 mm × 4 mm) were obtained from the manufacturer and composite resin (Z-100) discs with similar dimensions were prepared. All discs were polished to 600 grit and divided into 8 groups (n = 3 disks each), four control (non-NTP treated) and four experimental (NTP treated for 10 s) groups. All groups received one of the four following treatments prior to cementation with Rely × Unicem cement: sand-blasting (SB), a Clearfil ceramic primer (MDP), sand-blasting + MDP (SBMDP), or baseline (B), no treatment. SE readings and surface roughness parameters were statistically analysed (ANOVA, Tukey's, p < 0.05). Mixed model and paired samples t-tests were used to compare groups on MTBS.ResultsXPS showed increase in O and decrease in C elements after NTP. The polar component increased for BP (42.20 mN/m) and SBP (43.77 mN/m). MTBS values for groups BP (21.3 MPa), SBP (31 MPa), MDPP (30.1 MPa) and SBMDPP (32.3 MPa) were significantly higher in specimens treated with NTP than their untreated counterparts B (9.1 MPa), SB (14.4 MPa), MDP (17.8 MPa) and SBMDP (24.1 MPa).Conclusions(1) Increase of O and decrease of C led to higher surface energy levels dictated by the polar component after NTP; (2) NTP application increased MTBS values of Y-TZP surfaces. |
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