温度对根管封闭剂流变学特性的影响。

The effect of temperature on rheological properties of endodontic sealers.

作者信息

Rai Roshni U, Singbal Kiran P, Parekh Vaishali

机构信息

Department of Conservative Dentistry and Endodontics, KM Shah Dental College and Hospital, Vadodara, Gujarat, India.

出版信息

J Conserv Dent. 2016 Mar-Apr;19(2):116-9. doi: 10.4103/0972-0707.178683.

DOI:10.4103/0972-0707.178683

PMID:27099414

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4815536/

Abstract

AIM

The purpose of this study was to investigate temperature-dependent rheological properties of three endodontic sealers MTA Fillapex (Angelus, Brazil), AH Plus (Dentsply, Germany), and EndoREZ (Ultradent, USA).

MATERIALS AND METHODS

Five samples of each group of endodontic sealers (n = 30) were freshly mixed and placed on the plate of a rheometer (MCR 301, AntonPaar, Physica) and examined at 25°C and 37°C temperature, respectively. Rheological properties of the sealers were calculated according to the loss modulus (G″), storage modulus (G'), loss factor (Tan δ), and complex viscosity (η*) using dynamic oscillatory shear tests.

RESULTS

Statistical analysis (Wilcoxon signed-rank test) demonstrated that MTA Fillapex exhibited higher loss modulus (G″ > G') and a crossover region. AH Plus and EndoREZ had a higher storage modulus (G' > G″) at both temperatures. Loss factor (Tan δ) of MTA Fillapex was the highest compared to AH Plus, followed by EndoREZ. With a temperature change from 25°C to 37°C, MTA Fillapex exhibited a decrease while AH Plus exhibited an increase and, EndoREZ exhibited the least change, in complex viscosity (η*).

CONCLUSIONS

EndoREZ exhibited better rheological properties compared to the other two test sealers.

摘要

目的

本研究旨在调查三种根管封闭剂MTA Fillapex（巴西安热卢斯公司）、AH Plus（德国登士柏公司）和EndoREZ（美国Ultradent公司）的温度依赖性流变学特性。

材料与方法

每组根管封闭剂取五个样本（n = 30），新鲜混合后置于流变仪（MCR 301，安东帕公司，Physica）的平板上，分别在25°C和37°C温度下进行检测。使用动态振荡剪切试验，根据损耗模量（G″）、储能模量（G'）、损耗因子（Tan δ）和复数粘度（η*）计算封闭剂的流变学特性。

结果

统计分析（Wilcoxon符号秩检验）表明，MTA Fillapex表现出更高的损耗模量（G″ > G'）和一个交叉区域。AH Plus和EndoREZ在两个温度下均具有更高的储能模量（G' > G″）。与AH Plus相比，MTA Fillapex的损耗因子（Tan δ）最高，其次是EndoREZ。随着温度从25°C变化到37°C，MTA Fillapex的复数粘度（η*）降低，AH Plus的复数粘度增加，而EndoREZ的复数粘度变化最小。