## 4 Discussion
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Element** & **Element** & **Element Name** & \
\begin{tabular}{c} **Atomic** \\ **Concentration** \\ \end{tabular} &
\begin{tabular}{c} **Weight** \\ **Concentration** \\ \end{tabular} \\ \hline
11 & Na & Sodium & 0.40 & 0.49 \\ \hline
14 & Si & Silicon & 0.26 & 0.39 \\ \hline
17 & Cl & Chlorine & 0.20 & 0.38 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: _Cont._is due to the ceramic bracket having zirconia particles coating the base of the bracket, which provides an undercut that strengthens the micromechanical bond. In addition, the translucent nature of ceramic brackets facilitates polymerization by light curing, and their high hardness prevents the peeling effect during the debonding procedure, resulting in high shear bond strength [26]. Other research by [PERSON] et al., also showed that home bleaching with 20% carbamide peroxide did not affect the shear strength of ceramic brackets [27]. Shear bond strength rises as a result of remineralization in both fluoride and non-fluoride groups. Remineralization can strengthen the bond and enhance the enamel's microscopic structure, but it has no effect on how etching creates microporous surfaces. These findings are consistent with those of [PERSON] et al., who found that applying a fluoride-containing desensitizing agent before bracket bonding with composite resin produced stronger bracket bonds than the control group (etching application only) [28]. According to research by [PERSON] et al., non-fluoride desensitization boosted shear bond strength. On the enamel surface, non-fluoride desensitization serves as a buffer by supplying calcium and phosphate ions, preventing demineralization and enabling remineralization [29]. Research by [PERSON] et al., showed that the shear strength of the metal bracket after home bleaching increased after the application of non-fluoride desensitization. This study used an artificial salivary buffer solution. Saliva can increase the effectiveness of non-fluoride desensitization so that maximum remineralization occurs after the administration of non-fluoride desensitization [30]. Different results were reported by [PERSON] et al., who stated that fluoride desensitization can reduce shear bond strength. Fluoride can generate fluorapatite crystals on the enamel, which are tougher than hydroxyapatite, so teeth with higher fluoride content should be more resistant to etching and can interfere with the bracket-bonding process and decrease shear bond strength [31]. Research conducted by [PERSON] et al., also showed that non-fluoride desensitization in the form of 26% potassium oxalate reduced shear bond strength. Oxalate is able to form calcium oxalate crystals that interfere with adhesion between resin and enamel [32]. The shear bond strength of the fluoride and non-fluoride groups was not significantly different. This shows that the two desensitizing materials have the same ability to increase the post-bleaching shear bond strength of the ceramic bracket with composite resin cementation. In both groups, there was remineralization caused by the desensitizing agent. Based on the SEM images, both groups showed remineralization, although the fluoride group showed a higher probability of remineralization because the pores were shallower and fewer and surrounded by a regular white structure, compared to the porous structure in the non-fluoride group, which was still surrounded by an irregular structure. These two images are different from the SEM image of the control group, which shows large numbers of deep pores surrounded by irregular structures. According to [PERSON] et al., samples that received fluoride desensitization experienced remineralization at a higher average rate than the control group. The depth of lesions that previously received demineralization treatment was measured using a stereomicroscope.