EFFECT OF IMMERSION AND INCORPORATION OF POLYVINYL CHLORIDE ON THE FLEXURE STRENGTH AND MICRO HARDNESS OF POLY METHYLACRYLATE DENTURE BASE RESIN

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Published: Sep 30, 2022
DOI: https://doi.org/10.35845/kmuj.2022.22178
Keywords:
Flexural Strength Acrylic Resins Acrylic denture Heat cure polymethylmethacrylate Polymethyl Methacrylate Polyvinyl Chloride Hardness Hardness Tests Dental Bases

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Shahid Ilyas
Department of Dental Material, Khyber Medical University Institute of Dental Sciences, Kohat, Pakistan and MPhil Scholar at Department of Dental Materials, Peshawar Dental College, Peshawar, Pakistan
Amjad Hanif
Department of Dental Materials, Peshawar Dental College, Peshawar, Pakistan

Abstract

OBJECTIVE:  To find the effect of artificial saliva, water and different percentages of polyvinyl chloride (PVC) on the flexural strength and microhardness of heat cure polymethylmethacrylate (HC-PMMA) denture base resin.


METHODS:  An in-vitro study conducted, from April-December, 2020, at the MRL University of Peshawar and Interdisciplinary Research Centre in Biomedical Materials  (COMSATS) Lahore. Total of 100 specimens for five groups (n=20) denoted by A, B, C, D and E containing 0%, 5%, 10%, 15% and 20% PVC in HC-PMMA respectively were fabricated to test flexural strength. Each group was divided into two subgroups depending on immersion medium containing ten specimens each. Three-point bending test was used to determine flexural strength. Microhardness was determined using thirty (n=30) specimens through Vickers hardness tester. Statistical analysis was performed by using one way ANOVA and post hoc Tukey test. P-value <0.05 was considered as significant.


RESULTS:  After immersion in water, one way ANOVA showed significant effect on flexural strength and Post-hoc Tukey’s test showed significant difference between group C and E (p<0.001) and, D and E (p< 0.001). Microhardness of A was significantly different from E after immersion in water (p<.05). Similarly, after immersion in artificial saliva, one way ANOVA showed statistically significant effect on microhardness (p< 0 .01) and Post-hoc Tukey’s test showed significant difference between group C and E (p<0.01) and, A and C (p<0.01).


CONCLUSION: Flexural strength of HC-PMMA impregnated with 20% PVC increased after immersion in water, similarly, HC-PMMA containing 10% PVC shows increased microhardness after immersion in artificial saliva.

Article Details

How to Cite
Ilyas, S., and A. Hanif. “EFFECT OF IMMERSION AND INCORPORATION OF POLYVINYL CHLORIDE ON THE FLEXURE STRENGTH AND MICRO HARDNESS OF POLY METHYLACRYLATE DENTURE BASE RESIN”. KHYBER MEDICAL UNIVERSITY JOURNAL, vol. 14, no. 3, Sept. 2022, pp. 184-9, doi:10.35845/kmuj.2022.22178.
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Vol. 14 No. 3 (2022): KMUJ 2022; VOL 14; ISSUE 3 - JUL - SEP
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Original Articles
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