<i>In Vitro</i> Evaluation of the Shear Bond Strength of Different Luting Cements on Zirconium Oxide Specimens in Primary Teeth

Objective:Nowadays in pediatric dentistry clinics, zirconia crowns have become widespread restoration choice of primary teeth with extensive decay. Aim of this study was to evaluate shear bond strength of different luting cements on zirconium oxide (zirconia) specimens in primary teeth.Methods:Eighty extracted primary molar teeth were selected for the study and teeth were randomly divided into four groups. Eighty zirconium oxide specimen were fabricated using CAD/CAM technology. Samples were cemented with zinc polycarboxylate cement (PK), conventional glass ionomer cement (GCIS), resin modified GCIS (RMCIS) and self adhesive resin cement (RS). After cementation, samples were kept in distilled water for three days at room temperature. Then speciemens were subjected to 1000 cycles thermal cycle process. Shear bond strength was determined using universal testing machine, debonded surfaces were examined using stereomicroscope. Tamhane’s test was used for pairwise comparisons of the mean bonding forces of the groups. Pearson chi-square test was used to compare the debonded surfaces. Significance level (p) was accepted as 0.05 in the application of the tests.Results:Mean bond strength of RMCIS group was statistically lower than RS, GCIS and PK cements (p<0.05). There wasn't statistically significant difference between mean bonding strength of RS, GCIS and PK cement group (p>0.05). There wasn't statistically significant difference between debonded surfaces of zirconia specimen after cementation with different bonding cements (p>0.05).Conclusion:We think that it may be more advantageous to adhere zirconia crowns with self adhesive RS in pediatric patients whom are difficult to provide moisture control.