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HOME > Restor Dent Endod > Volume 27(5); 2002 > Article
Original Article The effect of sandwich technique using flowable composite resin base on the microleakagein class II cavities of molar
Kang Lee, Chan-Ui Hong
2002;27(5):-514.
DOI: https://doi.org/10.5395/JKACD.2002.27.5.502
Published online: September 30, 2002

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Copyright © 2002 Korean Academy of Conservative Dentistry

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  • The aim of this study was to evaluate the marginal adaptation of direct class II sandwich restoration with packable composites(P-60), resin modified glass ionomer cement(Fuji-II LC), flowable compomer(Dyract Flow), flowable composites(Filtek Flow) in comparison with total bond restorations. In addition, for sandwich restorations, influence of different sandwich techniques was also evaluated.
    Large butt-joint box typed class II cavites with cervical margins 1mm below the cemento-enamel junction were cut into 70 extracted human molars. The cavities(7 groups, n=10) were filled using a closed/open sandwich restoration or total bond restoration technique with materials according to the manufacturer's recommandation using the single-component bonding agent for each system. Teeth were thermocycled 500 times between 5℃ and 55℃ with 30-second dwell time. The teeth were then coated with nail polish 1mm short of the restoration, placed in a 2% methylene blue for 24 hours, and sectioned with diamond wheel. Sections were examined with a stereoscope to determine the extent of microleakage. Dentine/Cementum margins were analyzed for microleakage on scale of 0(no leakage) to 4(entire axial wall) and interface between materials, on scale of 0(no leakage) to 3(axial wall). Results were evaluated with Kruskal Wallis Test, corrected for ties, to determine whether there were statistically significant differences among the seven groups. Pairs of groups were analyzed using the Student-Newman-Keuls Method and Dunn s Method.
    The results were as follows:
    1. All groups showed some micoleakage in cervical portion. But there were no microleakage in interface between materials.
    2. Closed sandwich restorations with Fuji-II LC and Filtek Flow had significantly lower leakage rating than total restorations with only P-60. However, open sandwich restorations with Dyract Flow showed significantly higher (P<0.05).
    3. Closed sandwich restorations had significantly lower leakage rating than total restorations. However open sandwich restoration s showed significantly higher (P<0.05).
    4. Sandwich restorations with Fuji-II LC were lower leakage than only P-60, Filtek Flow, Dyract Flow. But there were no statistically differences among the materials.
    From the results above, it could be concluded, closed sandwich restorations was effective in reducing microleakage of class II restorations. The best results showing the least microleakage were for the closed sandwich technique with Fuji-II LC and Filtek Flow.
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Table 1jkacd-27-502-i001.jpg
Table 2
(Mean Rank)

p>0.05

jkacd-27-502-i002.jpg
Table 3
Open sandwich vs Closed sandwich
jkacd-27-502-i003.jpg
Table 4
(Mean Rank) Kruskal-Wallis Test
jkacd-27-502-i004.jpg
Table 5
(Student-Newman-Keul method)

Significant difference at p<0.05

jkacd-27-502-i005.jpg
Table 6
(Mean rank)(Kruskal-Wallis Test)
jkacd-27-502-i006.jpg
Table 7
(Dunn's method)

Significant difference at p<0.05

jkacd-27-502-i007.jpg

Tables & Figures

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        The effect of sandwich technique using flowable composite resin base on the microleakagein class II cavities of molar
        J Korean Acad Conserv Dent. 2002;27(5):502-514.   Published online September 30, 2002
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      The effect of sandwich technique using flowable composite resin base on the microleakagein class II cavities of molar
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      The effect of sandwich technique using flowable composite resin base on the microleakagein class II cavities of molar

      (Mean Rank)

      p>0.05

      Open sandwich vs Closed sandwich

      (Mean Rank) Kruskal-Wallis Test

      (Student-Newman-Keul method)

      Significant difference at p<0.05

      (Mean rank)(Kruskal-Wallis Test)

      (Dunn's method)

      Significant difference at p<0.05

      Table 1

      Table 2 (Mean Rank)

      p>0.05

      Table 3 Open sandwich vs Closed sandwich

      Table 4 (Mean Rank) Kruskal-Wallis Test

      Table 5 (Student-Newman-Keul method)

      Significant difference at p<0.05

      Table 6 (Mean rank)(Kruskal-Wallis Test)

      Table 7 (Dunn's method)

      Significant difference at p<0.05


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