Santi Marina Rodrigues, Lins Rodrigo Barros Esteves, Sahadi Beatriz Ometto, Denucci Giovanna Corrêa, Soffner Gabriela, Martins Luís Roberto Marcondes
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Department of Cariology, Operative Dentistry and Dental Public Health, Indiana University School of Dentistry, Indianapolis, IN, USA.
Restor Dent Endod. 2022 Jul 14;47(3):e32. doi: 10.5395/rde.2022.47.e32. eCollection 2022 Aug.
This study aimed to evaluate the influence of inorganic composition and filler particle morphology on the mechanical properties of different self-adhesive resin cements (SARCs).
Three SARCs including RelyX Unicem-2 (RUN), Maxcem Elite (MAX), and Calibra Universal (CAL) were tested. Rectangular bar-shaped specimens were prepared for flexural strength (FS) and flexural modulus (FM) and determined by a 3-point bending test. The Knoop microhardness (KHN) and top/bottom microhardness ratio (%KHN) were conducted on the top and bottom faces of disc-shaped samples. Sorption (Wsp) and solubility (Wsl) were evaluated after 24 hours of water immersion. Filler morphology was analyzed by scanning electron microscopy and X-ray energy dispersive spectroscopy (EDS). FS, FM, %KHN, Wsp, Wsl, and EDS results were submitted to 1-way analysis of variance and Tukey's test, and KHN also to paired -test (α = 0.05).
SARC-CAL presented the highest FS value, and SARC-RUN presented the highest FM. SARC-MAX and RUN showed the lowest Wsp and Wsl values. KHN values decreased from top to bottom and the SARCs did not differ statistically. Also, all resin cements presented carbon, aluminum, and silica in their composition. SARC-MAX and RUN showed irregular and splintered particles while CAL presented small and regular size particles.
A higher mechanical strength can be achieved by a reduced spread in grit size and the filler morphology can influence the KHN, as well as photoinitiators in the composition. Wsp and Wsl can be correlated with ions diffusion of inorganic particles.
本研究旨在评估无机成分和填料颗粒形态对不同自粘树脂水门汀（SARC）力学性能的影响。
测试了三种SARC，包括RelyX Unicem-2（RUN）、Maxcem Elite（MAX）和Calibra Universal（CAL）。制备矩形棒状试样以测试弯曲强度（FS）和弯曲模量（FM），并通过三点弯曲试验测定。在圆盘状样品的顶面和底面进行努氏显微硬度（KHN）和顶/底显微硬度比（%KHN）测试。水浸泡24小时后评估吸附率（Wsp）和溶解度（Wsl）。通过扫描电子显微镜和X射线能量色散光谱（EDS）分析填料形态。将FS、FM、%KHN、Wsp、Wsl和EDS结果进行单因素方差分析和Tukey检验，KHN也进行配对检验（α = 0.05）。
SARC-CAL的FS值最高，SARC-RUN的FM最高。SARC-MAX和RUN的Wsp和Wsl值最低。KHN值从顶部到底部降低，且SARC之间无统计学差异。此外，所有树脂水门汀的成分中均含有碳、铝和硅。SARC-MAX和RUN显示出不规则和破碎的颗粒，而CAL呈现小而规则尺寸的颗粒。
通过减小粒度分布可获得更高的机械强度，填料形态可影响KHN以及成分中的光引发剂。Wsp和Wsl可能与无机颗粒的离子扩散相关。
