J Korean Acad Conserv Dent.  2005 Nov;30(6):442-449. 10.5395/JKACD.2005.30.6.442.

Correlation between Linear polymerization shrinkage & tooth cuspal deflection

• Lee SY
• Park SH

• KMID: 2175747
• DOI: http://doi.org/10.5395/JKACD.2005.30.6.442

Abstract

The purpose of the present study was to evaluate the relationship between the amount of cuspal deflection and linear polymerization shrinkage in resin composite and polyacid modified resin composite. For cuspal defelction and shrinkage measurement, Dyract AP, Compoglass F, Z100, Surefil, Pyramid, Synergy Compact, Heliomolar and Heliomolar HB were used. For measuring polymerization shrinkage, a custom made linometer (R&B, Daejon, Korea) was used. The amount of shrinkage among materials was compared using One-way ANOVA analysis and Tukey's test at the 95% of confidence level. For measuring cuspal deflection of teeth, standardized MOD cavities were prepared in extracted maxillary premolars. After a self-etching adhesive was applied, cavities were bulk filled with one of the filling materials.Fifteen teeth were used for each material. Cuspal deflection was measured by a custom made cuspal-deflection measuring device. One-way ANOVA analysis and Tukey's test were used to determine differences between the materials at the 95% of confidence level. Correlation of polymerization shrinkage and cuspal deflection were analyzed by regression analysis. The amount of polymerization shrinkage from least to greatest was Heliomolar, Surefil < Heliomolar HB < Z100, Synergy Compact < Dyract AP < Pyramid, Compoglass F (p < 0.05). The amount of cuspal deflection from least to greatest was Z100, Heliomolar, Heliomolar HB, Synergy Compact Surefil < Compoglass F < Pyramid, Dyract AP (p < 0.05). The amount of polymerization shrinkage and cuspal deflection showed a correlation (p < 0.001).

Keyword

Cuspal deflection; Polymerization shrinkage; Composite; Dentin adhesive

MeSH Terms

Adhesives
Bicuspid
Daejeon
Polymerization*
Polymers*
Tooth*
Adhesives
Polymers

Figure

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  Figure 1 Cavity preparation. Upper view (a), Side view (b)

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  Figure 2 Schematic drawing of cuspal deflection measuring machine.

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  Figure 3 Role of flexible lever.

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  Figure 4 Linear polymerization shrinkage versus time.

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  Figure 5 Amount of cuspal deflection versus time in MOD upper premolar.

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  Figure 6 Scatter plot of the relationship between amount of polymerization shrinkage (PS) amount and cuapal deflection (CD).

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