Browsing by Author "Krajangta N."

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    Effect of Repeated Autoclave on Hardness and Tensile Strength of Polypropylene/Natural Rubber Developed for Rubber Dam Clamp
    (2025-01-01) Nonthiphalang T.; Phumpatrakom P.; Rangsantham P.; Wongwitthayakool P.; Sirisinha C.; Krajangta N.; Nonthiphalang T.; Mahidol University
    In this study, we aimed to explore the feasibility of utilizing polypropylene (PP) and natural rubber (NR) blends as alternative materials for rubber dam clamps in dentistry. The hardness of various PP/NR blend ratios was compared to the commercial product SoftClampTM. Selected blend ratios exhibiting hardness values resembling rigid plastic were further evaluated for hardness and tensile strength after undergoing 1, 5, and 10 autoclave cycles. One-way ANOVA test results found that the PP/NR blends exhibited significantly lower hardness (p < 0.001) than the commercial SoftClampTM. PP/NR ratios of 100/0, 90/10, and 80/20 exhibited hardness levels equivalent to 82%, 80%, and 75% of SoftClampTM, respectively. Two-way ANOVA revealed significant reductions in hardness (p < 0.001) and tensile strength (p < 0.001) with increasing NR content across all autoclave cycles. However, post-autoclave assessments at 1, 5, and 10 cycles demonstrated no statistically significant differences in tensile strength (p = 0.058) and hardness (p = 0.52) for PP/NR ratios of 100/0, 90/10, and 80/20 compared to their pre-autoclave states. The NR content within the PP/NR blends decreased hardness and tensile strength, while autoclaving did not significantly affect the hardness and tensile strength of the PP/NR blends.
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    The Flexural Strength and the Effect of the Autoclave Sterilization of Polypropylene/Natural Rubber Blended Materials
    (2024-11-01) Rangsantham P.; Nonthiphalang T.; Wongwitthayakool P.; Sirisinha C.; Krajangta N.; Phumpatrakom P.; Rangsantham P.; Mahidol University
    Background: Rubber dam clamps are used extensively in dentistry, especially during root canal treatment. However, existing rubber dam clamps have several drawbacks, including discomfort and potential damage to vital tissue in the oral cavity. To address these existing issues, a new rubber dam clamp should be developed. The aim of this study was to identify the optimum ratios of polypropylene and natural rubber (PP/NR) for a customized rubber dam clamp in dentistry. This study was focused on the flexural strength of PP/NR in various ratios. Moreover, the impact of autoclave sterilization was also considered. Methods: Six proportions of PP/NR blends (100/0, 90/10, 80/20, 70/30, 60/40 and 50/50) were prepared and assessed for flexural strength using a three-point bending test. After this test, the PP/NR blends with 100/0, 90/10 and 80/20 ratios were selected and underwent autoclave sterilization for 1, 5 and 10 cycles. Eventually, the flexural strength testing was repeated and investigated. An analysis of variance and Tukey’s test were used to evaluate the flexural strength of various PP/NR blends before autoclave sterilization at p < 0.05. An analysis of variance and Dunnett’s T3 test were used to evaluate the flexural strength of selected PP/NR blends before and after autoclave sterilization at p < 0.05. Results: The results revealed that the flexural strength of PP/NR blended materials showed a statistically significant difference in every group of this study. The autoclave sterilization test revealed that the flexural strength of the PP/NR 90/10 and 80/20 ratios was significantly increased after sterilization for 1, 5 and 10 cycles. In addition, the PP/NR 90/10 ratio was also comparable to the 100/0 ratio. The lower NR content in PP/NR blends resulted in significantly higher flexural strength, and autoclave sterilization had an effect on this property. Conclusions: This study suggested that the PP/NR blend with a 90/10 ratio might be considered as an alternative material for developing rubber dam clamps.