Amount of polymerization shrinkage and shrinkage stress in composites and compomers for posterior restoration

Sung-Ho Park; Soon-Young Lee; Yong-Sik Cho; Su-Sun Kim; Chang-Jae Lee; Young-Joo Kim; Bong-Hee Lee; Kouang-Sung Lee; Byung-Duk Noh

doi:10.5395/JKACD.2003.28.4.348

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Original Article Amount of polymerization shrinkage and shrinkage stress in composites and compomers for posterior restoration: Sung-Ho Park, Soon-Young Lee, Yong-Sik Cho, Su-Sun Kim, Chang-Jae Lee^#, Young-Joo Kim^#, Bong-Hee Lee^#, Kouang-Sung Lee^#, Byung-Duk Noh; 2003;28(4):-353.
DOI: https://doi.org/10.5395/JKACD.2003.28.4.348
Published online: July 31, 2003

Department of Conservative Dentistry, Yonsei University, Korea.

^#College of Dentistry, Yonsei University, Korea.

Corresponding author (sunghopark@yumc.yonsei.ac.kr)

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Abstract
REFERENCES

Abstract

The purpose of present study was to evaluate the polymerization shrinkage stress and amount of linear shrinkage of composites and compomers for posterior restoration.

For this purpose, linear polymerization shrinkage and polymerization stress were measured.

For linear polymerization shrinklage and polymerization stress measurement, custom made Linometer (R&B, Daejon, Korea) and Stress measuring machine was used (R&B, Daejon, Korea). Compositers and compomers were evaluated; Dyract AP (Dentsply Detrey, Gumbh. German) Z100 (3M Dental Products, St. Paul, USA) Surefil (Dentsply Caulk, Milford, USA) Pyramid(Bisco, Schaumburg, USA) Synergy Compact (Coltene, Altstatten, Switzerland), Heliomolar (Vivadent/Ivoclar, Liechtenstein), and Compoglass (Vivadent Ivoclar/Liechtenstein) were used. 15 measurements were made for each material. Linear polymerization shrinkage or polymerization stress for each material was compared with one way ANOVA with Tukey at 95% levels of confidence.

For linear shrinkage; Heliomolar, Surefil<Synergy Compact, Z100<Dyract AP<Pyramid, Compoglass F (p<0.05)

For Shrinkage stress; Heliomolar<Z100, Pyramid<Synergy Compact, Compoglass F<Dyract AP<Heliomolar HB, Surefil (p<0.05)
Keywords: Polymerization shrinkage stress; Polymerization shrinkage amount; Composite resin; Linometer; Tensiometer; Packable composite

Fig. 1

Schematic diagram of custom made linometer with a sample in place

Fig. 2

Schematic drawing of the custom made polymerization shrinkage stress measuring machine with a sample in place

Fig. 3

Change of the amount of linear polymerization shrinkage versus time in tested materials.

Fig. 4

Change in the polymerization stress versus time.

Table 1

Restorative materials used in this study.

Table 2

Shrinkage stress (kg/mm²)

Table 3

Polymerization shrinkage & Flexural modulus of posterior composites

a: Technical documentation, Coltene, Switzerland

b: Kerr Technical manual

c: Surefil technical update (4-9-99)

d: 3M Technical manual

e: Bisco home page

f: Ivoclar-Vivadent Report

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