Mechanical Properties Enhancement of Conventional Glass Ionomer Cement by Adding Zirconium Oxide Micro and Nanoparticles

Ali N. Alobiedy,Ahmed R. Al-Hamaoy,Ali H. Alhille

doi:10.31026/j.eng.2019.02.05

Abstract

The aim of this work is to enhance the mechanical properties of the glass ionomer cement GIC (dental materials) by adding Zirconium Oxide ZrO2 in both micro and nano particles. GIC were mixed with (3, 5 and 7) wt% of both ZrO2 micro and nanoparticles separately. Compressive strength (CS), biaxial flexural strength (BFS), Vickers Microhardness (VH) and wear rate losses (WR) were investigated. The maximum compression strength was 122.31 MPa with 5 wt. % ZrO2 micro particle, while 3wt% nanoparticles give highest Microhardness and biaxial flexural strength of 88.8 VHN and 35.79 MPa respectively. The minimum wear rate losses were 3.776µg/m with 7 wt. % ZrO2 nanoparticle. GIC-containing ZrO2 micro and nanoparticles is a promising restorative material with improved mechanical properties expect wear rate losses.

Highlights

IntroductionThe glass ionomer cement (GIC) were invented from silicon cement material in the early years of this century where the first was introduced to the dental profession in 1972 by Wilson, 1972, This substance is composed of acid in addition to the powder, where they are mixed according to the manufacturer's instructions to form a mixture similar to the paste (cement) as it hardens within 2-10 minutes after the preparation process paste, Nicholson, 1998 and Wilson, 1972
The glass ionomer cement (GIC) were invented from silicon cement material in the early years of this century where the first was introduced to the dental profession in 1972 by Wilson, 1972, This substance is composed of acid in addition to the powder, where they are mixed according to the manufacturer's instructions to form a mixture similar to the paste as it hardens within 2-10 minutes after the preparation process paste, Nicholson, 1998 and Wilson, 1972
The addition of ZrO2 particles enhance the mechanical properties of the GIC, except the wear rate losses

Summary

Introduction

The glass ionomer cement (GIC) were invented from silicon cement material in the early years of this century where the first was introduced to the dental profession in 1972 by Wilson, 1972, This substance is composed of acid in addition to the powder, where they are mixed according to the manufacturer's instructions to form a mixture similar to the paste (cement) as it hardens within 2-10 minutes after the preparation process paste, Nicholson, 1998 and Wilson, 1972 This material is characterized by excellent adhesion properties with the basic teeth structure and low fluoride release rate in addition to the coefficient of thermal expansion similar to the structure of the teeth with a decrease in toxicity and they are considered biocompatible led to their widespread use as luting materials, cavity liners and bases, and restorative materials, Wilson, 1972. The purpose of the present study was to evaluate the effects of adding (3, 5, 7) wt. % of ZrO2 (micro and nanoparticles size) into conventional GIC and study its effect on the mechanical properties

Objectives

Results

Conclusion