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Comparison of linear polymerization shrinkage in composites and compomer polymerized by plasma arc or conventional visible light curing
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Original Article Comparison of linear polymerization shrinkage in composites and compomer polymerized by plasma arc or conventional visible light curing
Jae-Ik Lee, Sung-Ho Park
Journal of Korean Academy of Conservative Dentistry 2002;27(5):488-492.
DOI: https://doi.org/10.5395/JKACD.2002.27.5.488
Published online: September 30, 2002

Department of Conservatine Dentistry, School of Dentistry, Yonsei University, Korea.

Copyright © 2002 Korean Academy of Conservative Dentistry

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  • The purpose of this study was to evaluate the effectiveness of plasma arc curing (PAC) unit for composite and compomer curing. To compare its effectiveness with conventional quartz tungsten halogen (QTH) light curing unit, the polymerization shrinkage rates and amounts of three composites (Z100, Z250, Synergy Duo Shade) and one compomer, that had been light cured by PAC unit or QTH unit, was compared using a custome made linometer. The measurement of polymerization shrinkage was performed after polymerization with either QTH unit or PAC unit. In case of curing with the PAC unit, the composite was light cured with Apollo 95E for 6s, the power density of which was recorded as 1350 mW/cm2 by Coltolux Light Meter. For light curing with QTH unit, the composite was light cured for 30s with the XL2500, the power density of which was recorded as 800 mW/cm2 by Coltolux Light Meter. The amount of linear polymerization shrinkage was recorded in the computer every 0.5s for 60s. Ten measurements were made for each material. The amount of linear polymerization shrinkage for each material in 10s and 60s which were cured with PAC or QTH unit were compared with t test. The amount of polymerization shrinkage in the tested materials were compared with 1way ANOVA with Duncan's multiple range test.
    As for the amounts of polymerization shrinkage in 60s, there was no difference between PAC unit and QTH unit in Z250 and Synergy Duo Shade. In Z100 and Dyract AP, it was lower when it was cured with PAC unit than when it was cured with QTH unit (p<0.05).
    As for the amounts of polymerization shrinkage in 10s, there was no difference between PAC unit and QTH unit in Z100 and Dyract AP. The amounts of polymerization shrinkage was significantly higher when it was cured with PAC unit in Z250 and Synergy Duo Shade (p<0.05). The amounts of polymerization shrinkage in the tested materials when they were cured with QTH unit were Z250 (6.6um) < Z100 (9.3um), Dyract AP (9.7um) < Synergy Duo Shade (11.2um) (p<0.05). The amount of polymerization shrinkage when the materials were cured with PAC unit were Dyract AP (5.6um) < Z100 (8.1um), Z250(7.0um) < Synergy Duo Shade (11.2um) (p<0.05).
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Fig. 1
Schematic diagram of custome made linometer
jkacd-27-488-g001.jpg
Fig. 2
Change in the amount of linear polymerization shrinkage versus time in Z100 that was light cured with Apollo 95E or XL2500
jkacd-27-488-g002.jpg
Fig. 3
Change in the amount of linear polymerization shrinkage versus time in Z250 that was light cured with Apollo 95E or XL2500
jkacd-27-488-g003.jpg
Fig. 4
Change in the amount of linear polymerization shrinkage versus time in Synergy Duo shade that was light cured with Apollo 95E or XL2500
jkacd-27-488-g004.jpg
Fig. 5
Change in the amount of linear polymerization shrinkage versus time in Dyract AP that was light cured with Apollo 95E or XL2500
jkacd-27-488-g005.jpg
Table 1
List of composites and compomer which was used un this study
jkacd-27-488-i001.jpg
Table 2
Amounts of linear shrinkage that was measured at 60s (um) (*:p<0.05)
jkacd-27-488-i002.jpg
Table 3
Amounts of linear shrinkage that was measured at 10s (um) (*:p<0.05)
jkacd-27-488-i003.jpg
Table 4
Amounts of linear shrinkage at 10s / Amounts of linear shrinkage at 60s of light curing (%)
jkacd-27-488-i004.jpg

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        Comparison of linear polymerization shrinkage in composites and compomer polymerized by plasma arc or conventional visible light curing
        J Korean Acad Conserv Dent. 2002;27(5):488-492.   Published online September 30, 2002
        DOI: https://doi.org/10.5395/JKACD.2002.27.5.488
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      Comparison of linear polymerization shrinkage in composites and compomer polymerized by plasma arc or conventional visible light curing
      Image Image Image Image Image
      Fig. 1 Schematic diagram of custome made linometer
      Fig. 2 Change in the amount of linear polymerization shrinkage versus time in Z100 that was light cured with Apollo 95E or XL2500
      Fig. 3 Change in the amount of linear polymerization shrinkage versus time in Z250 that was light cured with Apollo 95E or XL2500
      Fig. 4 Change in the amount of linear polymerization shrinkage versus time in Synergy Duo shade that was light cured with Apollo 95E or XL2500
      Fig. 5 Change in the amount of linear polymerization shrinkage versus time in Dyract AP that was light cured with Apollo 95E or XL2500

      Fig. 1

      Fig. 2

      Fig. 3

      Fig. 4

      Fig. 5

      Comparison of linear polymerization shrinkage in composites and compomer polymerized by plasma arc or conventional visible light curing

      List of composites and compomer which was used un this study

      Amounts of linear shrinkage that was measured at 60s (um) (*:p<0.05)

      Amounts of linear shrinkage that was measured at 10s (um) (*:p<0.05)

      Amounts of linear shrinkage at 10s / Amounts of linear shrinkage at 60s of light curing (%)
      Table 1 List of composites and compomer which was used un this study

      Table 2 Amounts of linear shrinkage that was measured at 60s (um) (*:p<0.05)

      Table 3 Amounts of linear shrinkage that was measured at 10s (um) (*:p<0.05)

      Table 4 Amounts of linear shrinkage at 10s / Amounts of linear shrinkage at 60s of light curing (%)

      Table 1

      Table 2

      Table 3

      Table 4

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