التفاصيل البيبلوغرافية
| العنوان: |
Mechanical properties of denture base resin materials: CAD/CAM versus traditional heat-cure. |
| المؤلفون: |
van Vuuren W.-A., Jansen, van Vuuren L., Jansen, J., Aarts, S., Hanlin, J. N., Waddell |
| المصدر: |
New Zealand Dental Journal; Sep2020, Vol. 116 Issue 3, p81-89, 9p |
| مصطلحات موضوعية: |
FLEXURAL strength testing, FRACTURE toughness testing, THERMOCYCLING, MATERIALS testing, MECHANICAL behavior of materials |
| مستخلص: |
Statement of Problem Rapid development in computer assisted design and computer assisted manufacturing (CAD/CAM) technologies are driving material development. This has led to the evolution of pre-polymerized poly-methyl-methacrylate (PMMA) denture base CAD/CAM milling blocks, which are used to manufacture complete dentures digitally. Researchers have investigated the mechanical properties of these materials, and to date, no data are available on the effect of simulated aging on the mechanical properties of these materials. Purpose The aim of this study was to investigate and compare the mechanical properties of two commercially available CAD/CAM denture base materials and two traditional heat-cured denture base materials, before and after thermal cycling. Material and Methods ISO 20795-1:2013 standard testing methods were used to determine the flexural strength, elastic modulus and fracture toughness of two CAD/CAM denture base materials and two heat-cured denture base materials before and after thermal cycling. For flexural strength testing and determination of elastic modulus, both with and without thermal cycling, 30 specimens were prepared for each material group. For fracture toughness testing, both with and without thermal cycling, 15 specimens were prepared for each material group. The flexural strength data were used to calculate the Weibull modulus and characteristic strength for all test groups. One-way ANOVA and Student's t-test were used (P< 0.05) to determine statistical significance between material type, within group comparisons as well as comparing cycled versus non-cycled groups. Results Flexural strength measurements for most test groups were statistically similar before and after thermal cycling, apart from the Ivocap product, which produced significantly lower results after thermal cycling. Elastic modulus measurements for most test groups were statistically different after thermal cycling, apart from the Ivocap product, which produced statistically similar results before and after thermal cycling. Fracture toughness measurements for most test groups were statistically similar before and after thermal cycling, apart from the Vertex product, which produced significantly higher results after thermal cycling. Weibull statistics indicated better reliability for most test groups after thermal cycling. The Ivocap product produced a 30% drop in reliability after thermal cycling, although this is still 3x higher than the Vertex material. Conclusions All materials tested have sufficient flexural strength to resist fracture under normal wearing conditions, both before and after thermal cycling. Denture base materials that rely on a strict manufacturing protocol, such as mass produced pre-polymerized blocks or pre-dispensed and automated processing regimes, are more reliable and would eliminate operator error. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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