Department of Prosthetic Dentistry, Faculty of Medicine and Dentistry, Pomeranian Medical University, 1 Rybacka, Szczecin 70-204, Poland.
Department of Prosthetic Dentistry, Faculty of Medicine and Dentistry, Wroclaw Medical University, 1 Ludwika Pasteura, Wrocław 50-367, Poland.
Pain Res Manag. 2020 Oct 7;2020:6032832. doi: 10.1155/2020/6032832. eCollection 2020.
Experimental and model tests were conducted on ten fresh porcine temporomandibular joint discs. The average thickness of disc tissue was, accordingly, 2.77 mm for the anterior zone, 3.98 mm for the posterior, and 1.54 mm for the intermediate. The selection of research material in the form of porcine discs was due to the similarity to human discs.
Discs were loaded in cycles, a temporary course with the amplitude 3 N and frequency 0.07 Hz, and growth in the load was 1 N/s. The selection of load frequency was due to real conditions of temporomandibular joint functioning during mastication. The necessary experimental research was conducted on a testing machine with a measurement range of 2.5 kN.
The obtained numeric calculation results indicate that the number of load cycles has a decisive impact on the limitation of energy dispersion capacity through disc tissue. This phenomenon was observed in all the studies on the disc areas. Along with the growth in load cycles, discs are stiffened, and the most significant stiffness was observed in the intermediate area.
Based on the conducted research, it should be concluded that excessive load affecting temporomandibular joints caused by the act of mastication and occlusal forces generated during parafunction and in people with defined long-term bruxism has crucial importance on biomechanical disc properties and hence the course of temporomandibular joint conditions.
对十个新鲜猪颞下颌关节盘进行了实验和模型测试。相应地，前区关节盘组织的平均厚度为 2.77mm，后区为 3.98mm，中区为 1.54mm。选择猪盘作为研究材料是因为其与人盘相似。
关节盘在循环加载下工作，临时过程的幅度为 3N，频率为 0.07Hz，负载增长速度为 1N/s。选择负载频率是因为咀嚼过程中颞下颌关节的实际工作条件。必要的实验研究是在测量范围为 2.5kN 的试验机上进行的。
所得数值计算结果表明，负载循环次数对通过盘组织分散能量能力的限制有决定性影响。在所有关于盘区的研究中都观察到了这种现象。随着负载循环次数的增加，盘变硬，在中区观察到最大的刚度。
基于所进行的研究，可以得出结论，咀嚼行为和副功能期间产生的咬合力对颞下颌关节的过度负荷对生物力学盘特性以及颞下颌关节状况的发展具有重要意义。
