Evaluation of repair bond strength with different methods for zirconia restorations

Abstract

Abstract Background The aim of the study is to assess the bonding of two repair methods for zirconia. Null hypothesis Repair of zirconia with Cojet (3M Cojet sand, 68,411) and clearfil (clearfil REPAIR Kuraray Japan) has the same effect on the bond strength of zirconia restorations. Zirconia blocks were sliced before sintering into 28 samples (inCorisZI mono L), surface treated with two repair methods (Cojet and clearfil) then bonded to composite. Storage and thermocycling was done then loaded under shear until failure. Shear bond strength was collected and statistically analyzed. Graph pad Instat (Graph Pad, Inc.) software for windows was used for analyzing results. Results It was found that COJ surface treatment recorded statistically non-significant higher shear bond strength mean value (8.45 ± 0.70 Mpa) than CLE surface treatment (7.67 ± 2.55 Mpa) as indicated by paired t-test. Conclusion It was concluded that bond strength between composite resin and inCoris ZI mono L is the same in resistance to shear stresses after Cojet surface treatment and after Clearfil surface treatment.