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Measurements of shrinkage stress and reduction of inter-cuspal distance in maxillary premolars resulting from polymerization of composites and compomers


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Measurements of shrinkage stress and reduction of inter-cuspal distance in maxillary premolars resulting from polymerization of composites and compomers

Article information

Restor Dent Endod. 2004;29(4):346-352
Publication date (electronic) : 2004 July 31
doi : https://doi.org/10.5395/JKACD.2004.29.4.346
Soon-Young Lee, Sung-Ho Park
Department of Conservative Dentistry, College of Dentistry, Yonsei University, Korea.
Corresponding author: Sung-Ho Park. Department of Conservative Dentistry, College of Dentistry, Yonsei University, 134 Shinchon-Dong, Seodaemoon Gu, Seoul, Korea, 120-752. Tel: 82-2-361-8709, Fax: 82-2-313-7575, sunghopark@yumc.yonsei.ac.kr

Abstract

The purpose of present study was to evaluate the polymerization shrinkage stress and cuspal deflection in maxillary premolars resulting from polymerization shrinkage of composites and compomers.

Composites and compomers which were used in this study were as follows: Dyract AP, Z100, Surefil, Pyramid, Synergy Compact, Heliomolar, Heliomolar HB, and Compoglass F. For measuring of polymerization shrinkage stress, Stress measuring machine (R&B, Daejon, Korea) was used. One-way ANOVA analysis with Duncan's multiple comparison test were used to determine significant differences between the materials.

For measuring of cuspal deflection of tooth, MOD cavities were prepared in 10 extracted maxillary premolars. And reduction of intercuspal distance was measured by strain measuring machine (R&B, Daejon, Korea) One-way ANOVA analysis with Turkey test were used to determine significant differences between the materials.

Polymerization shrinkage stress is 『Heliomolar, Z100, Pyramid < Synergy Compact Compoglass F < Dyract AP < Heliomolr HB, surefil』 (P < 0.05). And cuspal delfelction is 『Z100, Heliomolar, Heliomolar HB, Synergy Compact Surefil, < Compoglass F < Pyramid, Dyract AP』 (P < 0.05).

Measurements of ploymerization shrinkage stress and those of cuspal deflection of the teeth was different. There is no correlation between polymerization shrinkage stress and cuspal deflection of the teeth (p > 0.05).

Keywords: Polymerization shrinkage stress; Cuspal deflection; Composite resin; Compomer

References

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Article information Continued

Copyright © 2004 Korean Academy of Conservative Dentistry
(open-access) :

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Figure 1

Figure 1

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

Figure 2

Figure 2

Schematic drawing of cavity preparation.

Figure 3

Figure 3

Cuspal deflection measuring machine.

Figure 4

Figure 4

Schematic drawing of the cuspal deflection measuring machine.

Figure 5

Figure 5

Change in the polymerization stress versus time.

Figure 6

Figure 6

Change of cuspal deflection of premolars versus time.

Figure 7

Figure 7

Regression analysis.

Table 1

Restorative materials used in this study.

Table 1

Table 2

Mean value of shrinkage stress at 120s (MPa)

Table 2

Table 3

Mean value of cuspal deflection at 10 min (µm)

Table 3

Table 4

Elastic modulus and filler contents of posterior composites

Table 4

a: Obtained from manufactures' technical manual and home page

b: Data taken from Y. Abe (2001)