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.
Highlights
In dentistry, gutta-percha is one of the most popular materials for obturating the root canal space
The lateral condensation technique, which fills the root canal space using one master gutta-percha point and a number of accessory gutta-percha points with side-to-side filling using a dental spreader, has been widely used clinically for many years
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Summary
Gutta-percha is one of the most popular materials for obturating the root canal space. Resistance (tug-back) upon withdrawing the master point inserted up to the apical seat is used to confirm whether the tip of the master point is suitable for the shape of the enlarged root canal. This technique is always used in combination with a root canal sealer. It has been found that warmed gutta-percha techniques are not necessarily superior to the lateral condensation procedure [14,15], and the use of root canal sealer is frequently required in warmed gutta-percha methods [16,17]. As a consequence, warmed gutta-percha techniques have not yet replaced the lateral condensation method
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