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Evaluation of polymerization shrinkage stress in silorane-based composites


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Evaluation of polymerization shrinkage stress in silorane-based composites

Article information

Restor Dent Endod. 2011;36(3):188-195
Publication date (electronic) : 2011 May 31
doi : https://doi.org/10.5395/JKACD.2011.36.3.188
Seung-Ji Ryu, DDS, Ji-Hoon Cheon, DDS, Jeong-Bum Min, DDS, PhD
Department of Conservative Dentistry, Chosun University School of Dentistry, Gwangju, Korea.
Correspondence to Jeong-Bum Min, DDS, PhD. Professor, Department of Conservative Dentistry, Chosun University School of Dentistry, Gwangju, Korea. TEL, +82-62-220-3840; FAX, +82-62-223-9064; minjb@chosun.ac.kr
Received 2011 March 06; Revised 2011 April 29; Accepted 2011 April 29.

Abstract

Objectives

The purpose of this study was to evaluate the polymerization shrinkage stress among conventional methacrylate-based composite resins and a silorane-based composite resin.

Materials and Methods

The strain gauge method was used for the determination of polymerization shrinkage strain. Specimens were divided by 3 groups according to various composite materials. Filtek Z-250 (3M ESPE) and Filtek P-60 (3M ESPE) were used as a conventional methacrylate-based composites and Filtek P-90 (3M ESPE) was used as a silorane-based composites. Measurements were recorded at each 1 second for the total of 800 seconds including the periods of light application. The results of polymerization shrinkage stress were statistically analyzed using One way ANOVA and Tukey test (p = 0.05).

Results

The polymerization shrinkage stress of a silorane-based composite resin was lower than those of conventional methacrylate-based composite resins (p < 0.05). The shrinkage stress between methacrylate-based composite resin groups did not show significant difference (p > 0.05).

Conclusions

Within the limitation of this study, silorane-based composites showed lower polymerization shrinkage stress than methacrylate-based composites. We need to investigate more into polymerization shrinkage stress with regard to elastic modulus of silorane-based composites for the precise result.

Keywords: Methacrylate composite; Polymerization shrinkage stress; Silorane composite; Strain gauge

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Article information Continued

Copyright © 2011 Korean Academy of Conservative Dentistry

Figure 1

Figure 1

Structure of strain gauge.

Figure 2

Figure 2

Schematic diagram of specimen and preparation.

Figure 3

Figure 3

Analysis of stress in a thick-walled acrylic ring.

Figure 4

Figure 4

Change of shrinkage stress (MPa) in each group for 800 seconds.

Table 1

Composites used in the study

Table 1

Table 2

Values of shrinkage stress in each group at each measuring time (MPa)

Table 2

Mean ± SD, Different letters indicate significant difference between groups (p < 0.05).

SD, Standard deviation.