仿生珍珠层状陶瓷/聚合物复合材料的制备及其在椅旁 CAD/CAM 牙科修复中的机械性能。

Fabrication and mechanical properties of biomimetic nacre-like ceramic/polymer composites for chairside CAD/CAM dental restorations.

机构信息

Biomaterials Engineering Group (bioMEG), Bristol Dental School, University of Bristol, UK; Prosthodontics Department, Faculty of Dentistry, Jordan University of Science and Technology, Jordan.

Biomaterials Engineering Group (bioMEG), Bristol Dental School, University of Bristol, UK.

出版信息

Dent Mater. 2022 Jan;38(1):121-132. doi: 10.1016/j.dental.2021.10.016. Epub 2021 Nov 24.

DOI:10.1016/j.dental.2021.10.016

PMID:34836698

Abstract

OBJECTIVE

To fabricate and characterise a novel chairside CAD/CAM composite dental materials. These composites have a nacre-like anisotropic microstructure, consisting of highly aligned ceramic scaffolds infiltrated with polymer.

METHOD

Bi-directional freeze casting of alumina ceramic suspension was used to fabricate highly aligned ceramic scaffolds that were subsequently uniaxially pressed to control the ceramic volume fraction and then infiltrated with UDMA/TEGDMA polymer. The produced composites were subjected to mechanical testing, namely three-point bending, hardness and fracture toughness tests.

RESULTS

Novel biomimetic ceramic/polymer composites (BCPCs) were fabricated with nacre-like brick and mortar anisotropic microstructure. The mechanical properties were dependent on the ceramic volume fraction. The 70 vol% BCPC had sufficient flexural strength (135.08-145.77 MPa), stiffness (57.75-61.22 GPa) and hardness (3.07-3.36 GPa) and showed remarkable fracture resistance with K value of (2.54 MPa m).

SIGNIFICANT

Novel biomimetic ceramic/polymer composites show great potential as the next generation of CAD/CAM dental materials, as they closely resemble the combined mechanical properties of dentine and enamel.

摘要

目的

制备和表征一种新型的椅旁 CAD/CAM 复合牙科材料。这些复合材料具有类似珍珠母的各向异性微观结构，由高度取向的陶瓷支架组成，其中填充有聚合物。

方法

采用双向冷冻铸造氧化铝陶瓷悬浮液制备高度取向的陶瓷支架，然后对其进行单轴压制以控制陶瓷体积分数，随后用 UDMA/TEGDMA 聚合物进行渗透。对所制备的复合材料进行力学性能测试，包括三点弯曲、硬度和断裂韧性测试。

结果

制备出了具有类似珍珠母的砖和砂浆各向异性微观结构的新型仿生陶瓷/聚合物复合材料（BCPC）。其力学性能取决于陶瓷体积分数。70 vol% BCPC 具有足够的抗弯强度（135.08-145.77 MPa）、刚度（57.75-61.22 GPa）和硬度（3.07-3.36 GPa），并具有显著的断裂阻力，K 值为（2.54 MPa·m）。