Mapping the role of oral cavity physiological factors into the viscoelastic model of denture adhesives for numerical implementation.

IF 3.1 4区 医学 Q2 BIOPHYSICS
Anantha Narayanan Ramakrishnan, Oliver Röhrle, Christopher Ludtka, Josephine Koehler, Andreas Kiesow, Stefan Schwan
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Abstract

Physiological parameters of the oral cavity have a profound impact on any restorative solutions designed for edentulous patients including denture adhesives. This study aims to mathematically quantify the influence of three such variables, namely: the temperature, pH, and the swelling of such adhesives under the influence of saliva on its mechanical behavior. The mathematical quantification is further aimed to implement a material model for such adhesives which considers the impact of such physiological factors. The denture adhesive is experimentally investigated by means of rheological steady state frequency sweep tests to obtain the relaxation spectrum of the material. The relaxation behavior is measured for a wide range of oral cavity temperatures and pH. Also, the adhesive is hydrated and upon swelling to different levels again tested to understand the impact of swelling on the mechanical behavior. The experimentally measured continuous relaxation spectrum is modeled as a viscoelastic material using a discrete set of points based on the Prony series discretization technique. The relaxation spectrums for various temperatures are compared and the possibility of a time-temperature superposition is explored for the model. Similarly, the measured values of Storage and loss modulus are investigated to understand the role of pH and swelling. The results in this study clearly indicated a horizontal shift in the relaxation behavior with increase in temperature. And hence, the time-temperature shift factor was calculated for the adhesive. The relaxation spectrum also showed a strong correlation with swelling of the adhesive and the pH. The influence of these two parameters were captured into the model based on the relaxation time parameter in the Prony series approach. Based on this study the impact of these parameters could be appreciated on the performance and mechanical behavior of denture adhesives and implemented into a Prony series based viscoelastic material model which can be used with numerical simulations.

将口腔生理因素的作用映射到义齿粘接剂粘弹性模型中进行数值实现。
口腔的生理参数对包括义齿粘接剂在内的任何为无牙患者设计的修复溶液都有深远的影响。本研究旨在用数学方法量化这三个变量的影响,即:温度、pH值和黏合剂在唾液作用下的膨胀对其力学行为的影响。数学量化进一步旨在实现考虑此类生理因素影响的此类粘合剂的材料模型。采用流变稳态频率扫描试验对该义齿粘接剂进行了实验研究,得到了材料的弛豫谱。在很宽的口腔温度和ph范围内测量了松弛行为。此外,粘合剂被水化并在膨胀到不同水平时再次测试,以了解膨胀对机械行为的影响。实验测量的连续松弛谱采用基于proony级数离散化技术的离散点集建模为粘弹性材料。比较了不同温度下的弛豫谱,探讨了模型存在时间-温度叠加的可能性。同样,研究了存储模量和损失模量的测量值,以了解pH和溶胀的作用。本研究结果清楚地表明,随着温度的升高,弛豫行为呈水平变化。据此,计算了胶粘剂的时温位移系数。弛豫谱也与胶粘剂的溶胀和ph值有很强的相关性。这两个参数的影响被捕获到基于Prony系列方法中的弛豫时间参数的模型中。通过本研究,可以了解这些参数对义齿粘接剂性能和力学行为的影响,并将其实现到基于proony系列的粘弹性材料模型中,该模型可用于数值模拟。
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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来源期刊
Journal of Applied Biomaterials & Functional Materials
Journal of Applied Biomaterials & Functional Materials BIOPHYSICS-ENGINEERING, BIOMEDICAL
CiteScore
4.40
自引率
4.00%
发文量
36
审稿时长
>12 weeks
期刊介绍: The Journal of Applied Biomaterials & Functional Materials (JABFM) is an open access, peer-reviewed, international journal considering the publication of original contributions, reviews and editorials dealing with clinical and laboratory investigations in the fast growing field of biomaterial sciences and functional materials. The areas covered by the journal will include: • Biomaterials / Materials for biomedical applications • Functional materials • Hybrid and composite materials • Soft materials • Hydrogels • Nanomaterials • Gene delivery • Nonodevices • Metamaterials • Active coatings • Surface functionalization • Tissue engineering • Cell delivery/cell encapsulation systems • 3D printing materials • Material characterization • Biomechanics
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