Alonso de la Peña Víctor, Darriba Iria L, Caserío Valea Martín, Guitián Rivera Francisco
Department of Surgery and Medical and Surgical Specialties, Faculty of Medicine and Dentistry, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
Instituto de Cerámica, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
J Adv Prosthodont. 2016 Dec;8(6):433-438. doi: 10.4047/jap.2016.8.6.433. Epub 2016 Dec 15.
The aim of this study was to evaluate the mechanical properties (bending strength and hardness) of seven different fiber reinforced composite posts, in relation to their microstructural characteristics.
Two hundred eighty posts were divided into seven groups of 40, one group for each type of post analyzed. Within each group, 15 posts were subjected to three-point bending strength test, 15 to a microhardess meter for the Knoop hardness, and 10 to Scanning Electron Microscope in order to determine the diameter of the fibers and the percentage of fibers embedded in the matrix. To compare the flexural strength in relation to the type of fiber, matrix, and the hardness of the posts, a Kruskal-Wallis H test was used. The Jonckheere-Terpstra test was used to determine if the volume percent of fibers in the post influenced the bending strength.
The flexural strength and the hardness depended on the type of fibers that formed the post. The lower flexural strength of a post could be due to deficient bonding between the fiber and the resin matrix.
According to the results, other factors, besides the microstructural characteristics, may also influence the mechanical properties of the post. The feature that has more influence on the mechanical properties of the posts is the type of fiber.
本研究旨在评估七种不同纤维增强复合桩的力学性能（弯曲强度和硬度）及其微观结构特征。
280根桩被分为七组，每组40根，每组对应一种被分析的桩类型。在每组中，15根桩进行三点弯曲强度测试，15根用努氏硬度计测量硬度，10根用扫描电子显微镜来确定纤维直径和嵌入基体的纤维百分比。为比较不同纤维类型、基体及桩硬度对弯曲强度的影响，采用Kruskal-Wallis H检验。用Jonckheere-Terpstra检验来确定桩中纤维的体积百分比是否影响弯曲强度。
弯曲强度和硬度取决于构成桩的纤维类型。桩的弯曲强度较低可能是由于纤维与树脂基体之间的粘结不足。
根据结果，除微观结构特征外，其他因素也可能影响桩的力学性能。对桩的力学性能影响最大的因素是纤维类型。
