Dental composites reinforced with glass fibers have a low tensile modulus and relatively low fatigue resistance. The aim of the study was to analyze the fatigue properties of a dental composite reinforced with polyaramide fibers under the influence of a cyclic, vertical load. For this purpose, we designed a thermoformable template, corresponding to the construction of adhesive bridges in the side section of the jaw. Fifty-four composite samples were made for the study. They were divided into three groups—control (K) and two experimental groups (R1 and R2). The experimental samples were subjected to cyclic fatigue using 75 N load. The number of cycles was 4690 and 20,100. The study used a three-point bending test. Statistical analysis showed a change in elasticity in groups related to the number of load cycles. The study showed that the samples from the control group required the greatest force to break in relation to those subjected to the work cycles. The maximum force in control (K) group was 738.1 N, R1—487.8 N, and R2—451.4 N. The determined algorithm showed a change in deflection associated with the increase of force value. The study did not show any relationship between the type of sample fracture and the number of load cycles.

中文翻译：

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循环载荷作用下聚芳酰胺纤维增强的微混合牙科复合材料的降解

用玻璃纤维增​​强的牙科复合材料具有低拉伸模量和相对低的抗疲劳性。该研究的目的是分析在周期性垂直载荷的影响下，用聚芳酰胺纤维增强的牙科复合材料的疲劳性能。为此，我们设计了一种可热成型的模板，该模板对应于颚板侧面部分中的粘合桥结构。制作了54个复合样品用于研究。他们分为三组-对照组（K）和两个实验组（R1和R2）。使用75 N负载使实验样品经受循环疲劳。循环数是4690和20,100。该研究使用了三点弯曲测试。统计分析表明，各组的弹性变化与载荷循环次数有关。研究表明，与工作周期相比，对照组的样品需要最大的破坏力。对照组（K）组的最大力量为738.1 N，R1至487.8 N和R2至451.4N。确定的算法显示出挠度随力值的增加而变化。该研究未显示样品断裂的类型与载荷循环次数之间的任何关系。