J Korean Acad Prosthodont.  2010 Jan;48(1):55-60. 10.4047/jkap.2010.48.1.55.

In vitro study of Polymerization shrinkage-strain kinetics of dental resin cements

• Kim TH
• Yang JH
• Lee JB
• Han JS
• Kim SH

• KMID: 2000321
• DOI: http://doi.org/10.4047/jkap.2010.48.1.55

Abstract

PURPOSE
The shrinkage of dental resin cement may cause several clinical problems such as distortion that may jeopardize the accurate fit to the prepared tooth and internal stress within the restorations. It is important to know the polymerization shrinkage-strain of dental resin cement to reduce clinical complications. The purpose of this study was to investigate the polymerization shrinkage-strain kinetics of six commercially available dental resin cements. MATERIAL AND METHODS: Three self-cure resin cements (Fujicem, Superbond, M-bond) and three dual-cure resin cements (Maxcem, Panavia-F, Variolink II) were investigated. Time dependent polymerization shrinkage-strain kinetics of the materials were measured by the Bonded-disk method as a function of time at 23degrees C with values particularly noted at 1, 5, 10, 30, 60, 120 min after mixing. Five recordings were taken for each materials. The data were analyzed with one-way ANOVA and Scheffe post hoc test at the significance level of 0.05.
RESULTS
Polymerization shrinkage-strain values were 3.72%, 4.19%, 4.13%, 2.44%, 7.57%, 2.90% for Fujicem, Maxcem, M bond, Panavia F, Superbond, Variolink II, respectively at 120 minutes after the start of mixing. Panavia F exhibited maximum polymerization shrinkage-strain values, but Superbond showed minimum polymerization shrinkage-strain values among the investigated materials (P < .05). There was no significant differences of shrinkage-strain value between Maxcem and M bond at 120 minutes after the start of mixing (P > .05). Most shrinkage of the resin cement materials investigated occurred in the first 30 minutes after the start of mixing.
CONCLUSION
The onset of polymerization shrinkage of self-cure resin cements was slower than that of dual-cure resin cements after mixing, but the net shrinkage strain values of self-cure resin cements was higher than that of dual-cure resin cements at 120 minutes after mixing. Most shrinkage of the dental resin cements occurred in the first 30 minutes after mixing.

Keyword

Polymerization shrinkage; Resin cement; Bonded disk method

MeSH Terms

Glass Ionomer Cements
Kinetics
Polymerization
Polymers
Resin Cements
Resins, Synthetic
Sprains and Strains
Tooth
Glass Ionomer Cements
Polymers
Resin Cements
Resins, Synthetic

Figure

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  Fig. 1. Bonded-disk apparatus.

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  Fig. 2. Polymerization shrinakge-strain kinetic curve of Fujicem.

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  Fig. 3. Polymerization shrinakge-strain kinetic curve of Maxcem.

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  Fig. 4. Polymerization shrinakge-strain kinetic curve of M bond.

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  Fig. 5. Polymerization shrinakge-strain kinetic curve of Panavia F.

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  Fig. 6. Polymerization shrinakge-strain kinetic curve of Superbond.

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  Fig. 7. Polymerization shrinakge-strain kinetic curve of Variolink II.

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