Comparative evaluation of bond strength of resin cements with and without 10-methacryloyloxydecyl dihydrogen phosphate (mdp) to zirconia and effect of thermocycling on bond strength – An in vitro study

Abstract

Background To compare bond strength of resin cements with and without 10-Methacryloyloxydecyl Dihydrogen Phosphate (MDP) to zirconia and evaluate effect of thermocycling on bond strength. Material and Methods Standardised test specimens were fabricated as per ADA specification 131. Each Zirconia specimen was mounted in autopolymerzing acrylic resin material. The specimens were divided into 2 groups: Group 1 – specimens bonded with resin cement containing 10-MDP and Group II - specimens bonded with resin cement without 10-MDP. Forty samples of resin cement cylinders were prepared with dimensions of 6mm height and 4mm diameter in line with ADA specification 27 were cured onto the zirconia surface of 10mm x10mm x5mm using customised moulds. Specimens from each cement group were further divided into 2 subgroups: Subgroup A – Specimens that were not thermocycled and Subgroup B – Specimens that were thermocycled. Specimens were then subjected to tensile bond testing by using a Universal testing machine, the data were analysed using independent sample t test for bond strength and paired t test for effect of thermocycling. Statistical analysis used: Data was subjected to normalcy test (Shapiro-wilk test). Data showed normal distribution. Hence parametric test paired t test were applied. Results Paired t test revealed that the thermocycling affected the bond strength to zirconia. The highest bond strength was achieved for the resin cement with 10-MDP before thermocycling, whereas the lowest bond strength values were recorded for resin cement without 10-MDP after thermocycling. Conclusions Resin cement with 10-MDP showed superior bond strength to Zirconia than resin cement without 10-MDP. Adhesive failure was predominant at Zirconia and resin cement interface. Thermocycling had a significant effect on the bond strength of resin cements to zirconia, showing decreased bond strength. Key words: 10-MDP, Tensile Strength, Zirconia.

Analysis of the effect of thermocycling on bonding cements to zirconia

“…Therefore, the null hypothesis that states that thermocycling has no effect on shear bond strength between the self-adhesive resin cements used and the zirconia substrates was rejected. This finding was in line with previous studies ( Abhishek et al, 2022 , Lee et al, 2015 , Lüthy et al, 2006 , Malysa et al, 2022 , Ruales-Carrera et al, 2019 , Serra-Prat et al, 2014 ). According to Ozcan et al, this could be explained by the fact that the high heat in alternating cycles weakens the physicochemical properties of resin material and reduces the number of unreacted double bonds on the surface and within the resin structure ( Ozcan et al, 2007 ).…”

Shear Bond Strength of Different Zirconia Generations Bonded with Self Adhesive Resin Containing MDP

“…Since then, there has been a notable agreement in literature, including many systematic reviews, that the use of MDP-based primers on sandblasted zirconia surfaces significantly improves their bond strength to resin composites. (26)(27)(28)(29)(30)(31) Hereby, the long-standing battle between the misconceptions of clinicians versus evidence-based researchers regarding the bond ability of zirconia sounds remains unresolved.…”