Title: 0880 - Surface Treatment and Sintered Status Effect on Zirconia Bond Strength
Abeer Tashkandi (Presenter)
Henry M. Goldman School of Dental Medicine, Boston University
Yuwei Fan, Henry M. Goldman School of Dental Medicine, Boston University
Dan Nathanson, Henry M. Goldman School of Dental Medicine, Boston University
Objectives: The aim of this study is to compare the effect of airborne particle abrasion (APA) on surface treatment of partially and fully sintered zirconia, cemented to titanium abutments with resin cement.
Methods: Thirty Y-TZP zirconia rings with tapered hole were uniaxial dry pressed from powder (TZ-3YSB-E Tosoh zirconia) with a steel die set, and divided to 3 groups (10/group). Thirty titanium tapered pin-shaped abutments were machined with 4.8 mm diameter and 7.3° tapering angle and sandblasted with 125 µm alumina particle at 2.8 bar for 20s. After full sintering at 1530°C, all zirconia rings had 6.8 mm height, 9.8 mm outer diameter, 3.7 mm inner diameter at bottom, and 7.3° tapered hole. Group A: fully-sintered zirconia rings without surface treatment were cemented to titanium pin abutments (Control). Group B: inner surfaces of fully-sintered zirconia rings was APA treated with 50 µm alumina at 2.8 bar for 10s (APA-FS). In Group C: the inner surfaces of 1100°C partially-sintered zirconia rings were APA treated with 50 µm alumina particle, then fully-sintered at 1530°C (APA-PS). TheraCem resin cement (Bisco) was used to cement all the zirconia rings to titanium pins following manufacturer’s instruction under 14 N load for 5 mins. All cemented specimens were kept in 37°C water for 24 hours before testing. Instron machine (Model 5566A) with a pull-out fixture was used to test the ultimate retention of the zirconia ring on titanium abutments under tensile. One-way ANOVA post hoc Tukey HSD (JMP Pro 13.0.) was used for data analysis (α=0.05).
Results: The comparison of cement retention of tested groups are shown in Figure 1. Significant different retention loads were found among tested groups.
Conclusions: APA surface treatment of zirconia in partially sintered stage then fully sintered can significant increase the cement retention level by 145% vs. control, and increase 98% compared to APA treatment after fully sintered.
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The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE