Efficacy of Nano Magnesium Hydroxide in Improving Sealing Ability and Adaptation of Bioceramic Sealer An In Vitro Study

Document Type : Original Article

Authors

1 Associate Professor, Endodontics, Faculty of Dentistry, Minia University, Egypt

2 Lecturer of Dental Materials, Biomaterials Department, Faculty of Dentistry, Minia University, Egypt.

Abstract

ABSTRACT:
Aim of study: To evaluate the sealing ability and adaptation of a bioceramic sealer modified by nano-magnesium hydroxide (NMH) with different concentrations.
Materials and methods: Nano magnesium hydroxide was characterized using transmission electron microscope and X-ray diffraction analysis. Then, added to Ceramoseal HBC by 0.025%, 0.05% and 0.1% in weight. A total of 60 extracted upper central incisors were collected and prepared for endodontic treatment. The teeth were decoronated, their root canals were mechanically cleaned and shaped then, grouped randomly into four groups according to the percentages of added nanoparticles. Group Ⅰ: Bioceramic sealer without added nanoparticles as for Group Ⅱ, Group Ⅲ and Group Ⅳ; magnesium hydroxide nanoparticles were added in (0.025%, 0.05%, 0.1%) concentrations respectively. Obturation was performed using gutta percha and the tested materials. Out of each group; ten specimens were tested for sealing ability via dye penetration and five were tested for adaptation via SEM. The statistical analysis employs One-Way ANOVA with post hoc testing
Results: regarding dye penetration test across four different experimental groups, showed that Group I is significantly higher dye penetration from all other groups, Whilst, Group IV displays significantly better sealing ability (lowest measurement) than all other groups. For adaptation evaluation; Group I showed the largest gap width (5±0.4 μm, range 4.6-5.7 μm), followed by Groups II and III (both 3.7 μm), while Group IV demonstrated the smallest gap width (2.7±0.2 μm).
Conclusion: Addition of Nano-magnesium hydroxide (NMH) to bioceramic sealers enhanced their sealing ability and adaptation.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 5
Conservative Dentistry and Endodontics
July 2025
Pages 2711-2724

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