## 4 Discussion  
The present study was designed to evaluate the effect of try-in-paste contamination on the SBS of dentin treated with IDS versus DDS to lithium disilicate pressable glass-ceramics. The null hypothesis was that there was no difference in terms of SBS between lithium disilicate ceramics and try-in-paste-contaminated dentin treated with IDS or DDS. The results fail to support the null hypothesis with a significant difference being demonstrated between the mean SBS of IDS and DDS. Macro- or micro-test methods could be used for testing bond strength. Micro-tensile test setups have increased in popularity and were preferred by some researchers for offering a more uniform stress distribution at the bonded surface. Despite some advantages, preparing micro-tensile test specimens is a very technique-sensitive process. An interfacial crack can easily be created, which initiates crack propagation and results in an early failure at a lower strength [10]. Alternatively, the preparation of test specimens for macro-SBS testing is easy and fast, and no further specimen preparation is required after the bonding procedure. However, this testing has some disadvantages like uneven stress distribution across the interface. To overcome this problem, a crescent-shaped rod was used in the current study instead of a knife-edged rod. A crescent-shaped rod can dissipate the stress  
Figure 6: Energy dispersive X-ray spectroscopy analyses of intratubular (**A**) and intertubular (**B**) dentin. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & & **Mg** & **Al** & **Si** & \(\mathbf{p}\) & **Ca** & **Zn** \\ \hline \multirow{2}{*}{Weight Conc (\%)} & Intratubular & 0.47 & 4.58 & 5.74 & 26.80 & 57.67 & 4.74 \\ \cline{2-7}  & Intertubular & 1.64 & 1.94 & 2.16 & 33.17 & 55.89 & 5.21 \\ \hline \multirow{2}{*}{Atom Conc (\%)} & Intratubular & 0.69 & 6.12 & 7.38 & 31.24 & 51.95 & 2.62 \\ \cline{2-7}  & Intertubular & 2.45 & 2.60 & 2.78 & 38.78 & 50.50 & 2.89 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Weight percentages of elements from EDS analyses. better to a larger area, thus preventing stress concentrations [10]. Therefore, in the present study, the macro-SBS test was chosen as the testing method. When the shear bond strength test results were examined, the highest bond strength value was found in the IDS-applied group (11.45 MPa) and the lowest value was found in the contamination group (5.84 MPa). However, the difference between the bond values of the IDS-applied Group B and the control group was not statistically significant. (\(p>0.05\)). Similarly, in the study by [PERSON] et al., in which they examined the effect of the IDS procedure on the bond strength of press ceramics, the bond strength values of the IDS-applied groups were found to be between 6.94 and 10.03 MPa. No significant difference was found between the bond values of the IDS-applied groups and the control group [20]. These results are parallel to the current study. [PERSON] compared the bond strengths of IPS Empress crowns in the IDS-applied and non-IDS-applied groups. The average bond strength values of the dentin-coated groups were found to be 4.11 and 11.18 MPa. The average bond strength of the uncoated group was found to be 3.14 MPa [21]. There are also studies reporting that the IDS procedure has no effect on bond strength. [PERSON] et al. examined the effect of resin coating on bonding in indirect restorations. The average bond strength value of the uncoated group was found to be 9.5 MPa, while the values in the coated groups were found to be 9.2 MPa and 12.2 MPa, and no significant difference was found between the groups [22]. Cleaning the dentin surface before cementation is crucial. The temporary cementation of provisional restorations with eugenol-free cement could contaminate exposed dentin and may negatively affect the bond strength. Different methods have been described for cleaning the dentin surface. One study investigated the cleaning efficiency of different cleaning techniques on provisional cement-contaminated dentin [11].