Polymerization shrinkage kinetics of silorane-based composites

Youngchul Kwon; In-Bog Lee

doi:10.5395/JKACD.2010.35.1.051

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Kwon and Lee: Polymerization shrinkage kinetics of silorane-based composites

Basic Research

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2010; 35(1): 51-58.

Published online: 31 January 2010

DOI: https://doi.org/10.5395/JKACD.2010.35.1.051

Polymerization shrinkage kinetics of silorane-based composites

Youngchul Kwon, In-Bog Lee

Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

Corresponding Author: In-Bog Lee. Department of Conservative Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, 275-1 Yoengeon-Dong, Jongno-Gu, Seoul 110-786, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr

Received 10 January 2010 Revised 13 January 2010 Accepted 14 January 2010

Abstract

Dental composites have improved significantly in physical properties over the past few decades. However, polymerization shrinkage and stress is still the major drawback of composites, limiting its use to selected cases. Much effort has been made to make low shrinking composites to overcome this issue and silorane-based composites have recently been introduced into the market.

The aim of this study was to measure the volumetric polymerization shrinkage kinetics of a silorane-based composite and compare it with conventional methacrylate-based composites in order to evaluate its effectiveness in reducing polymerization shrinkage.

Five commercial methacrylate-based (Beautifil, Z100, Z250, Z350 and Gradia X) and a silorane-based (P90) composites were investigated. The volumetric change of the composites during light polymerization was detected continuously as buoyancy change in distilled water by means of Archemedes'principle, using a newly made volume shrinkage measurement instrument. The null hypothesis was that there were no differences in polymerization shrinkage, peak polymerization shrinkage rate and peak shrinkage time between the silorane-based composite and methacrylate-based composites. The results were as follows:

The shrinkage of silorane-based (P90) composites was the lowest (1.48%), and that of Beautifil composite was the highest (2.80%). There were also significant differences between brands among the methacrylate-based composites.
Peak polymerization shrinkage rate was the lowest in P90 (0.13%/s) and the highest in Z100 (0.34%/s).
The time to reach peak shrinkage rate of the silorane-based composite (P90) was longer (6.7 s) than those of the methacrylate-based composites (2.4-3.1 s).
Peak shrinkage rate showed a strong positive correlation with the product of polymerization shrinkage and the inverse of peak shrinkage time (R = 0.95).

Keywords: Silorane, Composites, Polymerization shrinkage, Peak polymerization shrinkage rate, Peak shrinkage time, Archemede'principle, Buoyancy

Figures and Tables

Figure 1

Schematic diagram of the instrument for measuring polymerization shrinkage.

Figure 2

(a) Representative curves of polymerization shrinkage (%) and (b) Polymerization shrinkage rate (%/s) of composites as a function of time.

Figure 3

(a) Polymerization shrinkage (%), (b) Peak shrinkage rate (%/s), and (c) Peak shrinkage time (s) of composites.

Table 1

Composites used in this study

Table 2

Polymerization shrinkage (%) at 10 min, peak shrinkage rate (%/s), peak shrinkage time (s), and the inverse of peak shrinkage time (1/s) of composites

Mean values with the same superscripts are not significantly different (p > 0.05).

Number in parenthesis is standard deviation.

Table 3

Correlation analysis among polymerization shrinkage (%), peak shrinkage rate (%/s), peak shrinkage time (s), the inverse of peak time (1/s), and the product of polymerization shrinkage and the inverse of peak time of the composites

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