Evaluation and comparison of transverse and impact strength of different high strength denture base resins.
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Date
2016-01
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Abstract
Aim: The present study was undertaken to evaluate and compare the impact strength and
transverse strength of the high‑impact denture base materials. A conventional heat polymerized
acrylic resin was used as a control.
Materials and Methods: The entire experiment was divided into four main groups with twenty
specimens each according to denture base material selected Trevalon, Trevalon Hi, DPI Tuff and
Metrocryl Hi. These groups were further subgrouped into the two parameters selected, impact
strength and flexural strength with ten specimens each. These specimens were then subjected
to transverse bend tests with the help of Lloyds instrument using a three point bend principle.
Impact tests were undertaken using an Izod–Charpy digital impact tester.
Results: This study was analyzed with one‑way analysis of variance using Fisher f‑test and
Bonferroni t‑test. There was a significant improvement in the impact strength of high‑impact
denture base resins as compared to control (Trevalon). However, in terms of transverse bend
tests, only DPI Tuff showed higher transverse strength in comparison to control. Trevalon Hi
and Metrocryl Hi showed a decrease in transverse strength.
Conclusions: Within the limits of this in vitro study, (1) There is a definite increase in impact
strength due to the incorporation of butadiene styrene rubber in this high strength denture base
materials as compared to Trevalon used as a control. (2) Further investigations are required to
prevent the unduly decrease of transverse strength. (3) It was the limitation of the study that
the exact composition of the high‑impact resins was not disclosed by the manufacturer that
would have helped in better understanding of their behavior.
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Keywords
High‑impact denture base resin, impact strength, transverse strength
Citation
Gupta Abhinav, Tewari R K. Evaluation and comparison of transverse and impact strength of different high strength denture base resins. Indian Journal of Dental Research. 2016 Jan-Feb; 27(1): 61-65.