• M.Rithanya
• Dr.Sanyukta Singh
• Dr.Subash Sharma

Introduction: Tooth bleaching is the lightening of the colour of a tooth through the application of a chemical agent to oxidise the organic pigmentation in the tooth. The bleaching process is based on the REDOX reaction. Before the bleaching process, the tooth is the reducing agent and the bleaching agent is the oxidising agent. After bleaching , the tooth is oxidised and bleaching material is reduced. Application of neutraliser post bleaching enhances the bonding strength of enamel. Aim: The aim of this study is to evaluate the bond strength of enamel with and without neutraliser after bleaching using Pola office. Materials and methods: Two groups of six natural anterior teeth were selected and bleached with the Pola office. In one group, sodium ascorbate was applied as a neutraliser while the other group did not have a neutraliser. Both the groups were then etched, bonded and restored with composite. Both groups were then subjected for shear bond strength evaluation using Instron. Results and discussion: Based on the results analysed it has been observed that bond strength has been increased significantly after application of neutraliser sodium ascorbate. Better bleaching is achieved by the action of free radicals like nascent oxygen and perhydroxyl which reduces the bond strength of enamel. Application of neutraliser like sodium ascorbate counteracts the activity of free radical improving bond strength. Conclusion: The data obtained and graphical analysis showed that the samples with neutraliser had better shear bond strength and required higher amounts of force and compressive strength to debond the composite from enamel.

Tooth bleaching, compressive strength, shear bond strength, Pola office, sodium ascorbate

"COMPARATIVE EVALUATION OF BOND STRENGTH OF ENAMEL WITH AND WITHOUT NEUTRALIZER AFTER BLEACHING USING POLA OFFICE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 1, page no.g594-g601, January-2024, Available :http://www.jetir.org/papers/JETIR2401671.pdf

"COMPARATIVE EVALUATION OF BOND STRENGTH OF ENAMEL WITH AND WITHOUT NEUTRALIZER AFTER BLEACHING USING POLA OFFICE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 1, page no. ppg594-g601, January-2024, Available at : http://www.jetir.org/papers/JETIR2401671.pdf