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VOLUME 13 , ISSUE 2 ( April-June, 2023 ) > List of Articles

ORIGINAL RESEARCH

Fracture Resistance of Functionally Graded Three-unit Fixed Partial Denture with Titanium Dioxide and Silica Nanoparticles: An In Vitro Study

Aditi A Kanitkar, Paresh V Gandhi, Ajay V Sabane, Vijaysingh More, Aneesh S Kanitkar, Rajashree Jadhav

Keywords : Aging, Nanotechnology, Reliability, Silica nanoparticle, Three-unit monolithic zirconia prostheses, Titanium dioxide nanoparticle

Citation Information : Kanitkar AA, Gandhi PV, Sabane AV, More V, Kanitkar AS, Jadhav R. Fracture Resistance of Functionally Graded Three-unit Fixed Partial Denture with Titanium Dioxide and Silica Nanoparticles: An In Vitro Study. Int J Prosthodont Restor Dent 2023; 13 (2):94-103.

DOI: 10.5005/jp-journals-10019-1413

License: CC BY-NC 4.0

Published Online: 28-06-2023

Copyright Statement:  Copyright © 2023; The Author(s).


Abstract

Purpose: The objective of this study was to assess the fracture resistance of functionally graded monolithic zirconia with different nanoparticles in three-unit fixed dental prostheses (FDPs) after undergoing thermal and mechanical aging. Materials and methods: A total of 32 three-unit monolithic zirconia prostheses were machined and randomly assigned to four groups (n = 8 each) as Group A—control group (without any nanoparticle), Group B—titania sol group, Group C—silica sol group, and Group D—silica and titania nano-sol group. Grading with nanoparticles was carried out on presintered monolithic zirconia and then was sintered. Fixed prostheses were exposed to thermocycling for 5–55°C for 10,000 cycles. The long-term clinical performance of monolithic zirconia was assessed by quasi-static fracture strength of 0–300 N for 1,00,000 cycles. After following loading conditions, prostheses were loaded until fracture. Fracture mode and evaluation of nanoparticles were seen under a field-emission scanning electron microscope (FE-SEM). Energy dispersive spectroscopy (EDS) was done to find an elemental composition of nanoparticles in zirconia. Weibull's modulus implies the reliability of material for each of the four materials. Kruskal–Wallis analysis of variance (ANOVA) followed by a post hoc test done for the between-group differences in the maximum load-bearing capacity of the four groups. Results: Significant variance (p = 0.001) in the fracture resistance of three-unit FDPs after mechanical and thermal cycling was observed. The fracture resistance of the control group A (703.60 N) was significantly lesser than that of the titania sol group B (1031.35 N) and silica and titania nano-sol group D (1094.74 N). Weibull moduli values of all four groups are as follows in descending order groups D > A > B > C. Conclusion: Functional grading of monolithic zirconia with silica and titanium dioxide nanoparticles can increase the fracture resistance of three-unit FDPs after aging. The addition of titanium to zirconia has been shown to increase the Weibull modulus, which corresponds to a higher level of homogeneity of the material and more excellent reliability as a structural material.

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