Comparative Evaluation of the Effect of 5% Sodium Hypochlorite on the Microhardness of Posterior Bulkfill and Nanohybrid Composite Resin

Authors

  • Dr. Jayeeta Verma MDS, Reader, Dept. of conservative dentistry and Endodontics, MGM dental college and hospital, Kamothe, Navi Mumbai.
  • Dr. Neha Patil Fellow, Dept. of conservative dentistry and Endodontics, MGM dental college and hospital, Kamothe, Navi Mumbai.
  • Dr. Antara Ghosh MDS, Lecturer, Dept. of conservative dentistry and Endodontics, MGM dental college and hospital, Kamothe, Navi Mumbai.
  • Dr. Sumanthini MV MDS, Prof and HOD, Dept. of conservative dentistry and Endodontics, MGM dental college and hospital, Kamothe, Navi Mumbai.
  • Dr. Anuradha Patil MDS, Prof, Dept. of conservative dentistry and Endodontics, MGM dental college and hospital, Kamothe, Navi Mumbai.
  • Dr. Tanvi Satpute MDS, Lecturer, Dept. of conservative dentistry and Endodontics, MGM dental college and hospital, Kamothe, Navi Mumbai.

DOI:

https://doi.org/10.63278/mme.vi.1623

Keywords:

hardness, immersion, nanocomposites, resin, sodium hypochlorite.

Abstract

Aim : The aim of this study was to evaluate the effect of 5% Sodium hypochlorite (NaOCl) on the microhardness of Posterior Bulkfill and Nanohybrid composite resin.

Methods: 34 disc-shaped composite samples were prepared using Teflon moulds of 10 mm diameter and 2 mm depth and divided into Group 1 and Group 2, with 17 samples each of Bulkfill composite and Nanohybrid composite, respectively. The samples were immersed in 5ml of 5% NaOCl for 40 minutes and the solution was replenished after every 5 minutes. Pre and post immersion Vickers hardness testing was performed for each group using a 100-gram load and dwell time of 10 seconds on top surface. Statistical analysis was done.

Results: Mean initial microhardness was 68.09±5.73 and 61.05±5.13 for Bulkfill and nanohybrid composite discs, respectively. After immersion, the microhardness reduced to 63.14±4.68 for Bulkfill and 57.05±4.92 for Nanohybrid composite, respectively. This difference was statistically significant. (p<0.05)

Conclusion: Bulkfill and Nanohybrid composite resins showed decrease in microhardness on exposure to 5% NaOCl used as endodontic irrigant thus necessitating replacement of pre-endodontic build-up before final post endodontic restoration.

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How to Cite

Verma, Dr. Jayeeta, Dr. Neha Patil, Dr. Antara Ghosh, Dr. Sumanthini MV, Dr. Anuradha Patil, and Dr. Tanvi Satpute. 2025. “Comparative Evaluation of the Effect of 5% Sodium Hypochlorite on the Microhardness of Posterior Bulkfill and Nanohybrid Composite Resin”. Metallurgical and Materials Engineering, May, 692-99. https://doi.org/10.63278/mme.vi.1623.

Issue

Vol. 31 No. 5 (2025)

Section

Research

License

Copyright (c) 2025 Dr. Jayeeta Verma, Dr. Neha Patil, Dr. Antara Ghosh, Dr. Sumanthini MV, Dr. Anuradha Patil, Dr. Tanvi Satpute

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