Impact of the Physiological Parameters of the Oral Cavity on the Mechanical Properties of Zinc-stabilized and Zinc-free Adhesive Creams: A Comparative In Vitro Study.

Josephine Reymann, Anantha Narayanan Ramakrishnan, Christopher Ludtka, Jeremias Hey, Andreas Kiesow, Stefan Schwan
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Abstract

Purpose: The current trend in denture adhesives is shifting toward zinc-free formulations due to the significant health concerns associated with zinc. Studies have focused on the retention of these zinc-free denture adhesives; however, there is a dearth of literature regarding their damping performance. This study analyzes the impact of oral cavity physiological parameters: temperature, pH, and swelling ratio on the mechanical properties of zinc-stabilized and zinc-free denture adhesives and examines the role zinc plays in influencing the adhesive behavior. This study investigates how underlying mechanical properties of adhesive cream change for zinc-stabilized and zinc-free denture adhesives. The relative damping and its variation from exposure to physiological conditions in the oral cavity can significantly assist in the design of dentures to reduce the discomfort experienced by denture wearers.

Materials and methods: The relative damping of the zinc-stabilized and zinc-free denture adhesives was investigated with the loss modulus values, which were evaluated using rheological frequency sweep tests. The tests were performed by maintaining the denture adhesives at specified values of temperature, pH, and swelling ratio, and over a frequency range of 0.01 Hz to 10 Hz, which included the average frequencies of human chewing / bite forces reported in existing literature.

Results: Zinc-stabilized denture adhesive showed a larger fluctuation of loss modulus values compared to the zinc-free formulation with respect to pH, temperature, and swelling ratios. The zinc-free denture adhesive showed higher damping behavior at frequencies below 0.7 Hz, whereas the zinc-stabilized denture adhesive showed higher damping behavior above loading frequencies of 0.7-1 Hz. Both the adhesives showed varying behavior on either side of the bite force spectrum in terms of relative damping of the applied bite.

Conclusions: The damping or cushioning effect provided by denture adhesives can reduce pain experienced and assist dental practitioners in better supporting denture wearers.

口腔生理参数对锌稳定膏和无锌膏力学性能影响的体外比较研究
目的:由于与锌相关的重大健康问题,目前义齿粘接剂的趋势正在转向无锌配方。研究主要集中在这些无锌义齿粘接剂的固位;然而,关于其阻尼性能的文献缺乏。本研究分析口腔生理参数:温度、pH、溶胀率对锌稳定和无锌义齿粘接剂力学性能的影响,探讨锌对粘接剂粘附行为的影响。本研究探讨了锌稳定型和无锌型义齿粘接剂胶膏的力学性能变化。相对阻尼及其在口腔内暴露于生理条件下的变化可以显著地帮助义齿的设计,以减少义齿佩戴者的不适。材料与方法:采用流变频扫法测定损失模量,研究了锌稳定和无锌义齿粘接剂的相对阻尼。测试将义齿黏合剂维持在特定的温度、pH值和溶胀率下,频率范围为0.01 Hz至10 Hz,其中包括现有文献中报道的人类咀嚼/咬合力的平均频率。结果:与无锌配方相比,锌稳定义齿粘接剂在pH、温度和溶胀率方面的损失模值波动更大。无锌义齿粘接剂在0.7 Hz以下表现出较高的阻尼特性,而稳定锌义齿粘接剂在0.7 ~ 1 Hz以上表现出较高的阻尼特性。两种胶粘剂在咬合力谱的两侧表现出不同的相对阻尼行为。结论:义齿粘接剂的减震或缓冲作用可以减轻义齿患者的疼痛,帮助牙科医生更好地支持义齿佩戴者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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