Universidade Federal de Pelotas, Pelotas, RS, Brazil; Radboud University Medical Center, Radboud Institute for Health Sciences, Department of Dentistry, Nijmegen, The Netherlands.
Universidade Federal de Pelotas, Pelotas, RS, Brazil.
Dent Mater. 2022 Jan;38(1):214-229. doi: 10.1016/j.dental.2021.12.006. Epub 2021 Dec 20.
This study reviewed the literature to identify in vitro approaches that have been used to simulate the mechanical degradation and fatigue of resin composite restorations.
A search for articles was carried out in 4 databases and included studies in which composite restorations were bonded to teeth and subject to cyclic loading. Articles were assessed for eligibility, and the following items were the extracted from the included studies: authors, country, year, materials tested, simulation device and details including load magnitude and frequency, number of cycles, type of antagonist, test medium, and temperature. Data were analyzed descriptively.
The 49 studies included showed a high level of heterogeneity in methods, devices, and test parameters. Nineteen different simulation devices were used, applying loads varying between 30 and 2900 N, and frequencies varying between 0.4 and 12 Hz. The load and frequency used most often were ~ 50 N (63.3%) and 1.5-1.7 Hz (32.7%). The number of cycles varied between 10 K and 2.4 M, 1.2 M was the most prevalent (40.8%). The majority of studies combined cyclic loading with at least one additional aging method: static liquid storage, thermo-mechanical cycling applied simultaneously, and thermal cycling as a discrete aging step were the three most frequent methods. The overall evidence indicated reporting problems, and suggested a lack of clinical validation of the research methods used.
Validation studies, underlying clinical supporting data, and better reporting practices are needed for further improving research on the topic. Specific suggestions for future studies are provided.
本研究综述了文献，以确定已用于模拟树脂复合材料修复体机械降解和疲劳的体外方法。
在 4 个数据库中进行了文献检索，包括将复合修复体粘结到牙齿上并进行循环加载的研究。评估文章的合格性，并从纳入的研究中提取以下项目：作者、国家、年份、测试材料、模拟设备以及包括载荷大小和频率、循环次数、对颌材料、测试介质和温度在内的详细信息。数据进行描述性分析。
纳入的 49 项研究在方法、设备和测试参数方面表现出高度异质性。使用了 19 种不同的模拟设备，施加的载荷在 30 至 2900 N 之间，频率在 0.4 至 12 Hz 之间。最常使用的载荷和频率分别为~50 N（63.3%）和 1.5-1.7 Hz（32.7%）。循环次数在 10 K 和 2.4 M 之间变化，1.2 M 最常见（40.8%）。大多数研究将循环加载与至少一种额外的老化方法结合使用：静态液体储存、同时施加热机械循环和作为离散老化步骤的热循环是三种最常见的方法。总体证据表明报告存在问题，并表明所使用的研究方法缺乏临床验证。
需要进行验证研究、提供潜在的临床支持数据，并改善报告实践，以进一步改进该主题的研究。为未来的研究提供了具体建议。
