Yes / The fracture resistance of polymethylmethacrylate (PMMA) as the most popular
denture base material is not satisfactory. Different factors can be involved in denture fracture.
Among them, flexural fatigue and impact are the most common failure mechanisms of an
acrylic denture base. It has been shown that there is a correlation between the static strength
and fatigue life of composite resins. Therefore, the transverse strength of the denture base
materials can be an important indicator of their service life. In order to improve the fracture
resistance of PMMA, extensive studies have been carried out; however, only a few
promising results were achieved, which are limited to some mechanical properties of PMMA
at the cost of other properties. This study aimed at optimizing the packing and processing
condition of heat-cured PMMA as a denture base resin in order to improve its biaxial flexural
strength (BFS). The results showed that the plain type of resin with a powder/monomer ratio
of 2.5:1 or less, packed conventionally and cured in a water bath for 2 h at 95 °C provides
the highest BFS. Also, it was found that the performance of the dry heat processor is
inconsistent with the number of flasks being loaded.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/9480 |
| Date | 04 1900 |
| Creators | Nejatian, T., Sefat, Farshid, Johnson, T. |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Article, published version paper |
| Rights | © 2016 MDPI. This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0 (https://creativecommons.org/licenses/by-nc-sa/4.0/ ). |
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