Comparison of the residual stress of the nanofilled composites

Jeong-won Park

doi:10.5395/JKACD.2008.33.5.457

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Park: Comparison of the residual stress of the nanofilled composites

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2008; 33(5): 457-462.

Published online: 30 September 2008

DOI: https://doi.org/10.5395/JKACD.2008.33.5.457

Comparison of the residual stress of the nanofilled composites

Jeong-won Park

Department of Conservative Dentistry, College of Dentistry, Yonsei University, Yongdong Severance Hospital, Korea.

Corresponding Author: Jeong Won Park. Department of Conservative Dentistry, College of Dentistry, Yonsei University Youngdong Severance Hospital, (Former position Department of Conservative Dentistry, School of Dentistry, Kyungpook National University), 146-92 Dogok-dong Gangnam-gu, Seoul, 135-720, S. Korea. Tel: 82-2-2019-1350, Fax: 82-2-3463-4052, pjw@yuhs.ac

Received 22 July 2008 Revised 12 August 2008 Accepted 25 August 2008

(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.

Abstract

"Residual stress" can be developed during polymerization of the dental composite and it can be remained after this process was completed. The total amount of the force which applied to the composite restoration can be calculated by the sum of external and internal force. For the complete understanding of the restoration failure behavior, these two factors should be considered. In this experiment, I compared the residual stress of the recently developed nanofilled dental composite by ring slitting methods.

The composites used in this study can be categorized in two groups, one is microhybrid type-Z250, as control group, and nanofilled type-Grandio, Filtek Supreme, Ceram-X, as experimental ones. Composite ring was made and marked two reference points on the surface. Then measure the change of the distance between these two points before and after ring slitting. From the distance change, average circumferential residual stress (σθ) was calculated. In 10 minutes and 1 hour measurement groups, Filtek Supreme showed higher residual stress than Z250 and Ceram-X. In 24 hour group, Filtek showed higher stress than the other groups.

Following the result of this experiment, nanofilled composite showed similar or higher residual stress than Z250, and when comparing the Z250 and Filtek Supreme, which have quite similar matrix components, Filtek Supreme groups showed higher residual stress.

Keywords: Residual stress, Dental composite, Nanofilled composite, Ring slitting method

Figures and Tables

Figure 1

Geometry of the expermental ring before and after slitting.

Table 1

Characterization of the resin composites tested

bis-GMA, bisphenol glycidyl methacrylate; bis-EMA, bisphenol A polyethylene glycol diether dimethacrylate; UDMA, urethane dimethacrytate, TEGDMA, tetraethyleneglycol dimethacrylate.

Table 2

Measured circumferential residual stress (σθ_ave) value and elastic modulus of test materials

σθ_ave means average circumferential residual stress of composite ring.

Same superscript in the same row means statistically not different (p < 0.05).

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