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 5℃/55℃. Microleakage was determined using a dye penetration test.
The results were as follows:
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 %)
Resin-based temporary filling materials showed 0.43 - 1.1 % expansion in 7 days.
Fermit showed the greatest leakage, while Quicks exhibited the least leakage.
There are no correlation between polymerization shrinkage or hygroscopic expansion and microleakage of resin-based temporary filling materials.
Figures and Tables
Figure 2
Representative curves of axial polymerization shrinkage of temporary filling materials as a function of time.
![jkacd-33-115-g002](/upload/SynapseData/ArticleImage/0185jkacd/jkacd-33-115-g002.jpg)
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
![jkacd-33-115-g005](/upload/SynapseData/ArticleImage/0185jkacd/jkacd-33-115-g005.jpg)
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.
![jkacd-33-115-g006](/upload/SynapseData/ArticleImage/0185jkacd/jkacd-33-115-g006.jpg)
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