Kosewski Przemysław, De Angelis Francesco, Sorrentino Edoardo, Mielczarek Agnieszka, Buonvivere Matteo, D'Arcangelo Camillo
Private Practice, 01650 Warsaw, Poland.
Unit of Restorative Dentistry and Endodontics, Department of Medical, Oral and Biotechnological Science, School of Dentistry, "G. D'Annunzio" University of Chieti, 66100 Chieti, Italy.
J Funct Biomater. 2023 Jul 25;14(8):395. doi: 10.3390/jfb14080395.
Lithium disilicate (LDS) glass ceramics are among the most common biomaterials in conservative dentistry and prosthodontics, and their wear behavior is of paramount clinical interest. An innovative in vitro model is presented, which employs CAD/CAM technology to simulate the periodontal ligament and alveolar bone. The model aims to evaluate the effect of the abutment rigidity on the wear resistance of the LDS glass ceramic. Two experimental groups (LDS restorations supported by dental implants, named LDS-on-Implant, or by hybrid ceramic tooth replicas with artificial periodontal ligament, named LDS-on-Tooth-Replica) and a control group (LDS-Cylinders) were compared. Fifteen samples ( = 15) were fabricated for each group and subjected to testing, with LDS antagonistic cusps opposing them over 120,000 cycles using a dual axis chewing simulator. Wear resistance was analyzed by measuring the vertical wear depth (mm) and the volume loss (mm) on each LDS sample, as well as the linear antagonist wear (mm) on LDS cusps. Mean values were calculated for LDS-Cylinders (0.186 mm, 0.322 mm, 0.220 mm, respectively), LDS-on-Implant (0.128 mm, 0.166 mm, 0.199 mm, respectively), and LDS-on-Tooth-Replica (0.098 mm, 0.107 mm, 0.172 mm, respectively) and compared using one-way-ANOVA and Tukey's tests. The level of significance was set at 0.05 in all tests. Wear facets were inspected under a scanning electron microscope. Data analysis revealed that abutment rigidity was able to significantly affect the wear pattern of LDS, which seems to be more intense on rigid implant-abutment supports compared to resilient teeth replicas with artificial periodontal ligament.
二硅酸锂（LDS）玻璃陶瓷是保守牙科和口腔修复学中最常见的生物材料之一，其磨损行为具有至关重要的临床意义。本文提出了一种创新的体外模型，该模型采用CAD/CAM技术来模拟牙周膜和牙槽骨。该模型旨在评估基台刚度对LDS玻璃陶瓷耐磨性的影响。比较了两个实验组（由牙科种植体支持的LDS修复体，称为种植体上的LDS，或由带有人工牙周膜的混合陶瓷牙齿复制品支持的，称为牙齿复制品上的LDS）和一个对照组（LDS圆柱体）。每组制作15个样本（n = 15）并进行测试，使用双轴咀嚼模拟器使LDS对抗牙尖与它们相对运动120,000次循环。通过测量每个LDS样本的垂直磨损深度（mm）和体积损失（mm）以及LDS牙尖上的线性对抗磨损（mm）来分析耐磨性。计算了LDS圆柱体（分别为0.186 mm、0.322 mm、0.220 mm）、种植体上的LDS（分别为0.128 mm、0.166 mm、0.199 mm）和牙齿复制品上的LDS（分别为0.098 mm、0.107 mm、0.172 mm）的平均值，并使用单因素方差分析和Tukey检验进行比较。所有测试的显著性水平均设定为0.05。在扫描电子显微镜下检查磨损面。数据分析表明，基台刚度能够显著影响LDS的磨损模式，与带有人工牙周膜的弹性牙齿复制品相比，在刚性种植体基台支持上的磨损似乎更严重。
