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Polymers 2015, 7(11), 2259-2275; doi:10.3390/polym7111512

Intraoral Temperature Triggered Shape-Memory Effect and Sealing Capability of A Transpolyisoprene-Based Polymer

1
Department of Restorative Dentistry and Endodontology, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan
2
Department of Information Science and Biomedical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Wei Min Huang
Received: 20 September 2015 / Revised: 23 October 2015 / Accepted: 29 October 2015 / Published: 9 November 2015
(This article belongs to the Special Issue Shape-Memory Polymers)
View Full-Text   |   Download PDF [8482 KB, uploaded 9 November 2015]   |  

Abstract

In dentistry, pure gutta-percha (trans-1,4-polyisoprene (TPI)) is widely used as a main component of root canal filling materials. TPI has an interesting shape memory formed through cross-linking, and this characteristic is expected to be very effective for development of novel dental treatments; in particular, modification of the shape recovery temperature to the intraoral temperature (37 °C) will enhance the applicability of the shape-memory effect of TPI in root canal filling. In this study, trial test specimens consisting of varying proportions of TPI, cis-polyisoprene, zinc oxide, stearic acid, sulfur and dicumyl peroxide were prepared and the temperature dependence of their shape recovery, recovery stress and relaxation modulus were measured. Additionally, their sealing abilities were tested using glass tubing and a bovine incisor. As the ratio of cross-linking agent in the specimens increased, a decrease in recovery temperature and an increase in recovery stress and recovery speed were observed. In addition, the test specimen containing the highest concentration of cross-linking agent showed superior sealing ability under a thermal stimulus of 37 °C in both sealing ability tests. View Full-Text
Keywords: shape-memory polymer; gutta-percha; trans-1,4-polyisoprene; root canal filling material; thermal property; crystallinity; sealing ability; cis-polyisoprene shape-memory polymer; gutta-percha; trans-1,4-polyisoprene; root canal filling material; thermal property; crystallinity; sealing ability; cis-polyisoprene
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tsukada, G.; Kato, R.; Tokuda, M.; Nishitani, Y. Intraoral Temperature Triggered Shape-Memory Effect and Sealing Capability of A Transpolyisoprene-Based Polymer. Polymers 2015, 7, 2259-2275.

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