الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
The aim of this study was the examination of surface roughness and microhardness of several glass ionomers based restorative materials under the influence of exposure to variable pH solutions.
Objectives:
1- Compare surface roughness and microhardness of zinc containing glass ionomer to metal modified glass ionomer and the conventional glass ionomer cements.
2- Determine the influence of different pH on these parameters.
3- Identify the effect of difference storage periods on the previous variables.