Citation Information :
Nawasrah A, Gad MM, Zayat ME. Effect of Henna Addition on the Surface Roughness and Hardness of Polymethylmethacrylate Denture Base Material: An in vitro Study. J Contemp Dent Pract 2018; 19 (6):732-738.
Aim: This study aimed to evaluate the effect of the addition of various henna—which can have antifungal properties—on the surface roughness and hardness of polymethylmethacrylate (PMMA) denture base material.
Materials and methods: A total of 99 rectangular-shaped (10 × 20 × 3 mm3) specimens were prepared from heat-cured acrylic resin and divided into one control group without the addition of henna and five test groups, which were prepared by adding Yamani henna powder to polymer at concentrations of 1, 2.5, 5, 7.5, and 10 wt%. The polymer was added to the monomer, mixed, packed, and processed using the conventional water bath method. After processing, specimens were finished and polished, then kept in distilled water for 48 ± 2 hours. A profilometer and Vickers hardness tester were used to measure surface roughness and hardness respectively. Statistical data analysis was conducted via Statistical Package for the Social Sciences (SPSS) version 20.0 (IBM, USA). The independent sample t-test was used and p ≤0.05 was considered statistically significant.
Results: The addition of henna at varying concentrations significantly increased the surface roughness values (p ≤ 0.01) while decreasing hardness (p ≤ 0.0001). The most favorable addition value was 1% henna between all henna groups.
Conclusion: The addition of henna to the acrylic resin may negatively affect the surface properties of PMMA acrylic denture base.
Clinical significance: Antimicrobial denture with minimum deterioration effects on its physical properties could be achieved with henna addition to denture base material in low concentration. However, 1% henna showed the best results between the henna groups as regards roughness and hardness values.
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