Comparison of Flexural Strength and Surface Hardness of Polymethyl Methacrylate Resin Reinforced with Silanised Aluminium Oxide Nanoparticles- An In-vitro Study
Introduction: In complete denture fabrication, the common denture base material used is heat activated Polymethyl Methacrylate (PMMA). Considering various advantages, still there are some disadvantages like poor flexural strength and poor wear resistance. The flexural strength of any material re...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
JCDR Research and Publications Private Limited
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/94bed49a703e42afb5f5ddc68278e953 |
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| Sumario: | Introduction: In complete denture fabrication, the common denture
base material used is heat activated Polymethyl Methacrylate
(PMMA). Considering various advantages, still there are some
disadvantages like poor flexural strength and poor wear resistance.
The flexural strength of any material reflects its potential to resist
catastrophic fracture under a flexural load. Another property that
influences the surface characteristics of acrylic resins is the surface
hardness, which indicates the ease of finishing a material and its
resistance to in-service scratching during cleaning procedures
and exposure to various oral fluids. Thus an ideal denture base
material should exhibit greater flexural strength and high surface
hardness for the longevity of the dentures.
Aim: To evaluate the effects of adding different percentages of
silanised aluminium oxide (Al2
O3
) nanoparticles on the flexural
strength and surface hardness of a conventional heat-polymerised
acrylic resin.
Materials and Methods: The in-vitro experimental study was
conducted between October 2020 to Janaury 2021 at Drs. Sudha
and Nageswara Rao Siddhartha Institute of Dental Sciences,
Vijayawada, Andhra Pradesh, India. A total of 120 samples were
fabricated and were grouped into four groups coded A to D
(n=30). Group A was the control group (without adding Al2
O3
).
Specimens in the other three groups (B to D) were reinforced with
silanised Al2
O3
at loadings of 1%, 2.5% and 5% w/w. Flexural
strength was assessed with a three-point bending test using a
universal testing machine. Surface hardness test was conducted
using a Vickers Hardness (VH) tester. Data was analysed using
Analysis of Variance (ANOVA) and Tukey’s post-hoc test.
Results: Among all the reinforced groups highest flexural strength
value was seen in Group C- PMMA+2.5% w/w silanised aluminium
oxide nanoparticles reinforced group (88.33 Mpa) and highest
surface hardness value was seen in the Group D- PMMA+5%
w/w silanised Aluminium oxide nanoparticles reinforced group
(29.44 VH).
Conclusion: Reinforcement of the conventional heat cured acrylic
resin with 2.5% w/w silanised Al2
O3
nanoparticles significantly
increased its flexural strength and hardness. |
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