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http://dx.doi.org/10.5395/JKACD.2008.33.2.115

POLYMERIZATION SHRINKAGE, HYGROSCOPIC EXPANSION AND MICROLEAKAGE OF RESIN-BASED TEMPORARY FILLING MATERIALS  

Cho, Nak-Yeon (Department of Consevative Dentistry, School of Dentistry, Seoul National University)
Lee, In-Bog (Department of Consevative Dentistry, School of Dentistry, Seoul National University)
Publication Information
Restorative Dentistry and Endodontics / v.33, no.2, 2008 , pp. 115-124 More about this Journal
Abstract
The purpose of this study was to measure the polymerization shrinkage and hygroscopic expansion of resin-based temporary filling materials and to evaluate microleakage at the interface between the materials and cavity wall. Five resin-based temporary filing materials were investigated: Fermit (Vivadent), Quicks (Dentkist), Provifil (Promedica), Spacer (Vericom), Clip (Voco). Caviton (GC) was also included for comparison. Polymerization shrinkage of five resin-based temporary filling materials was measured using the bonded disc method. For the measurement of hygroscopic expansion, the discs of six cured temporary filling materials were immersed in saline and a LVDT displacement sensor was used to measure the expansion for 7 days. For estimating of microleakage, Class I cavities were prepared on 120 extracted human molars and randomly assigned to 6 groups of 20 each. The cavities in each group were filled with six temporary filling materials. All specimens were submitted to 1000 thermocycles, with temperature varying from $5^{\circ}C/55^{\circ}C$. Microleakage was determined using a dye penetration test. The results were as follows: 1. Fermit had significantly less polymerization shrinkage than the other resin-based temporary fill ing materials. Fermit (0.22%) < Spacer (0.38%) < Quicks (0.64%), Provifil (0.67%), Clip (0.67%) 2. Resin-based temporary filling materials showed 0.43-1.1% expansion in 7 days. 3. Fermit showed the greatest leakage, while Quicks exhibited the least leakage. 4. There are no correlation between polymerization shrinkage or hygroscopic expansion and microleakage of resin-based temporary filling materials.
Keywords
Resin-based temporary filling material; Polymerization shrinkage; Hygroscopic expansion; Microleakage;
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