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Comparison of Microhardness of a Composite Core in Two Different Placement Techniques - An Invitro Study

Author(s): Faramarz Zakavi | Somayeh Hosseini Tabatabaei | Fatemeh Bahramnejed | Soheila Sadeghian | Kaveh Khalaj | Mahdi Pourmahdi borujeni

Journal: Scientific Medical Journal
ISSN 1026-8960

Volume: 11;
Issue: 1;
Start page: 27;
Date: 2012;
Original page

Keywords: Composite Placement Techniques | Hardness Tests | Composite Resin | Degree of Conversion

Background and Objective: The purpose of this study was laboratory comparison of microhardness values in one kind of composite core at complete building tooth with incremental and Bulk placement techniques. Subjects and Methods: Ten cylindrical samples of clearfil photo core-light cure (Kuraray/Japan), (Translucent, Single Shade) composite were prepared up to 9mm in Insulin syringes. Half of them were built with incremental placement technique by 2 mm increments and the other half were built with bulk placement technique. Light curing was done with output irradiance of 650 mw/cm2 for 40 seconds. Samples were cut in longitudinal position and were mounted in Epoxy resin. Vicker's microhardness was measured from surface of every samples in the 1,2,3,4,5,6,7,8,9 mm depths. Statistical Analyses were done with two-way ANOVA (P
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