J Korean Acad Conserv Dent.  2008 Mar;33(2):115-124. 10.5395/JKACD.2008.33.2.115.

Polymerization shrinkage, hygroscopic expansion and microleakage of resin-based temporary filling materials

• Cho NY
• Lee IB

• KMID: 1986756
• DOI: http://doi.org/10.5395/JKACD.2008.33.2.115

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 thermo-cycles, with temperature varying from 5degrees C/55degrees 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 filling 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.

Keyword

Resin-based temporary filling material; Polymerization shrinkage; Hygroscopic expansion; Microleakage

MeSH Terms

Calcium Sulfate
Dental Cements
Displacement (Psychology)
Humans
Molar
Polymerization
Polymers
Polymethacrylic Acids
Root Canal Filling Materials
Vinyl Compounds
Zinc Oxide
Calcium Sulfate
Dental Cements
Polymers
Polymethacrylic Acids
Root Canal Filling Materials
Vinyl Compounds
Zinc Oxide

Figure

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  Figure 1 Structure of an instrument to measure axial polymerization shrinkage.

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  Figure 2 Representative curves of axial polymerization shrinkage of temporary filling materials as a function of time.

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  Figure 3-a Hygroscopic expansion of Caviton as a function of time.

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  Figure 3-b Initial hygroscopic expansion of temporary resin materials as a function of time.

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  Figure 4 The representative pictures for different microleakage patterns. (a) Score 0: no leakage (b) Score 1: leakage up to half of the cavity depth (c) Score 2: leakage in the entire cavity depth without reaching the pulpal wall (d) Score 3: leakage in the entire cavity depth even reaching the pulpal wall

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  Figure 5 Boxplot display of mean and median leakage score for each group. The plot illustrates a summary of the microleakage scores based on the median, quartiles, and extreme values. The box represents the interquartile range which contains the 50% of values, the whiskers represent the highest and lowest microleakage values and the bold black line across the box indicates the median microleakage scores. The mark ◇ represents the mean microleakge scores.

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