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- Original Article Polymerization shrinkage, hygroscopic expansion and microleakage of resin-based temporary filling materials
- Nak Yeon Cho, In-Bog Lee
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Journal of Korean Academy of Conservative Dentistry 2008;33(2):115-124.
DOI: https://doi.org/10.5395/JKACD.2008.33.2.115
Published online: March 31, 2008
Department of Consevative Dentistry, School of Dentistry, Seoul National University, Korea.
- Corresponding Author: In-Bog Lee. Department of Conservative Dentistry, School of Dentistry, Seoul National University, 275-1 Yeongeon-Dong, Jongno-Gu, Seoul 110-768, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr
• Received: January 28, 2008 • Revised: March 5, 2008 • Accepted: March 6, 2008
Copyright © 2008 Korean Academy of Conservative Dentistry
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Abstract
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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.
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REFERENCES
Figure 2
Representative curves of axial polymerization shrinkage of temporary filling materials as a function of time.
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
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.
Table 2
Calculated linear polymerization shrinkage (%) of temporary filling materials
The numbers in parenthesis are S.D.
Same superscript letters mean that there is no statistical difference.
Calculated linear shrinkage = measured axial shrinkage ×(1/3)
Tables & Figures
REFERENCES
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Figure 1
Structure of an instrument to measure axial polymerization shrinkage.
Figure 2
Representative curves of axial polymerization shrinkage of temporary filling materials as a function of time.
Figure 3-a
Hygroscopic expansion of Caviton as a function of time.
Figure 3-b
Initial hygroscopic expansion of temporary resin materials as a function of time.
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
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.
Figure 1
Figure 2
Figure 3-a
Figure 3-b
Figure 4
Figure 5
Polymerization shrinkage, hygroscopic expansion and microleakage of resin-based temporary filling materials
Materials used in this study
Calculated linear polymerization shrinkage (%) of temporary filling materials
The numbers in parenthesis are S.D.
Same superscript letters mean that there is no statistical difference.
Calculated linear shrinkage = measured axial shrinkage ×(1/3)
Hygroscopic expansion (%) of temporary filling materials at 24 hr and 7 days
The numbers in parenthesis are S.D.
Same superscript letters mean that there is no statistical difference.
Number of specimens in each score and mean microleakage score
Table 1
Materials used in this study
Table 2
Calculated linear polymerization shrinkage (%) of temporary filling materials
The numbers in parenthesis are S.D. Same superscript letters mean that there is no statistical difference. Calculated linear shrinkage = measured axial shrinkage ×(1/3)
Table 3
Hygroscopic expansion (%) of temporary filling materials at 24 hr and 7 days
The numbers in parenthesis are S.D. Same superscript letters mean that there is no statistical difference.
Table 4
Number of specimens in each score and mean microleakage score
