711 Surface chemistry and bonds of Y-TZP after Plasma treatment

Friday, March 23, 2012: 10:45 a.m. - 12:15 p.m.
Presentation Type: Oral Session
G. VALVERDE1, P.G. COELHO2, R. CARVALHO3, M. JANAL4, V. THOMPSON5, F. LORENZONI6, J.A. DELBEN4, and N.R. SILVA7, 1College of Dentistry, New York University, New York, NY, 2Department Biomaterials and Biomimetics, New York University, New York, NY, 3USP, Bauru, SP, Brazil, 4Department of Biomaterials and Biomimetics, New York University, New York, NY, 5Professor and Chairman Department of Biomaterials, New York University College of Dentistry, Executive Management Team PEARL Network, New York, NY, 6University of Sao Paulo, Ponta Poră, Brazil, 7Department of Prosthodontics, New York University, New York, NY

Surface chemistry and bond strength to Y-TZP after Plasma treatment

Valverde GB, Coelho PG, Carvalho RM, Jamal M, Thompson VP, Lorenzoni FC, Delben J, Silva NRFA

       Objective: To chemically characterize and test bond strength (MTBS) of Y-TZP surfaces after Atmospheric Pressure Plasma (APP) application combined with different surface conditioning methods. Methods: Y-TZP discs (13.5 mm X 4mm) 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 discs each), four controls (Non-APP treated) and four experimental (APP treated) groups. All groups received one of the following treatments: sand-blasting (SB group), Clearfil ceramic primer application (MDP group), sand-blasting + MDP application (SBMDP group), or no treatment (B group). The experimental groups were APP treated for 10 s. Surface energy (SE) and X-ray photoelectron spectroscopy (XPS) readings of polished and sandblasted Y-TZP were evaluated. Y-TZP and Z-100 discs were bonded with Rely X Unicem cement and cross-sectioned to form beams. Half of the beams were kept dry and half were aged. Microtensile bond strength (MTBS) test was performed. Statistical analyses comprised of one-way ANOVA and Tukey at 95% for SE and a three way mixed model ANOVA at a 95% for the MTBS. Results: SB and B groups showed high SE levels after APP treatment. An increase in O and decrease in C elements was detected in the APP-treated discs (Figure 1). All APP groups tested dry showed higher bond strength (p<.05) than the untreated counterparts. Bond strength was partially affected by the aging process.

Fig 1: XPS of Y-TZP. a: polished and b: sand-blasted

a ::::private:var:folders:5A:5A34lit5GCmiRTl6y03V1E+++TU:-Tmp-:com.apple.mail.drag-T0x100520080.tmp.MohzO4:XPS B_BP.pdf

b ::::private:var:folders:5A:5A34lit5GCmiRTl6y03V1E+++TU:-Tmp-:com.apple.mail.drag-T0x100520080.tmp.BicP5q:XPS SB_SBP.pdf

Conclusion: APP application greatly increased bond strength (p<.05) when it was applied alone or in combination with treatments designed to improve bond strength to Y-TZP in dry conditions.

Keywords: Adhesion, Atmospheric Plasma, Ceramics, Prosthodontics and Surfaces
<< Previous Abstract | Next Abstract