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The Journal of Adhesive Dentistry
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J Adhes Dent 16 (2014), No. 4     29. Aug. 2014
J Adhes Dent 16 (2014), No. 4  (29.08.2014)

Page 377-382, doi:10.3290/j.jad.a32444, PubMed:25126623


Effect of Er,Cr:YSGG Laser Treatment on Microshear Bond Strength of Zirconia to Resin Cement Before and After Sintering
Ghasemi, Amir / Kermanshah, Hamid / Ghavam, Maryam / Nateghifard, Afshin / Torabzadeh, Hassan / Nateghifard, Ardalan / Zolfagharnasab, Kaveh / Ahmadi, Hadi
Purpose: To evaluate the effect of Er,Cr:YSGG laser treatment on microshear bond strength of zirconia to resin cement before and after sintering.
Materials and Methods: Ninety pre-sintered yttrium-stabilized tetragonal zirconia specimens (4 × 3 × 2 mm) were divided into 6 groups (n = 15). In group C, sintered zirconia was not treated (control group). In groups AS2 and AS3, sintered zirconia blocks were irradiated by Er,Cr:YSGG using a power of 2 and 3 W, respectively. Groups PS2 and PS3 consisted of pre-sintered blocks conditioned by Er,Cr:YSGG at 2 and 3 W, respectively. In group AA, sintered zirconia was air abraded with 50-μm alumina powder. One block was made using the same preparations as mentioned above and was morphologically assessed by SEM. Microcylinders of Panavia F 2.0 were placed on the treated surface of the groups. Samples were incubated at 37°C and 98% humidity for 48 h and then subjected to microshear bond strength testing. The mode of failure was evaluated. Data were analyzed by one-way ANOVA and Tukey's HSD test (p < 0.05).
Results: There was a statistically significant difference between group AA and the others (p < 0.0001). A significant difference was also noted between groups AS3 and C (p = 0.031). Complete surface roughness was seen in group AA and the bond failure was mostly cohesive, while in laser-treated groups, the surfaces roughness was much lower vs other groups, and the mode of failure was mostly adhesive.
Conclusion: Laser treatment of pre-sintered Y-TZP cannot be recommended for improving the bond. Although sandblasting of sintered Y-TZP yielded better results than the rest of the groups, 3 W power after sintering can also be effective in enhancing the bonding strength of resin cement to zirconia.

Keywords: Er,Cr:YSGG laser, pre- and post-sintered zirconia, microshear bond strength, surface treatment, failure mode analysis, SEM
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