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A variety of gutta-percha materials was subjected to dilatometric analysis to measure volume changes which take place with heating and cooling. The volume changes were found to be related directly to the molecular transformation kinetics of the polymer material and to the temperature ranges within which they take place. If the gutta-percha in the apical segment is not elevated above 45° C, molecular transformation is avoided and the ultimate volume changes which accompany temperature cycling are small, predictable, and controllable.
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☆From a thesis submitted by Dr. Goodman in partial fulfillment of the requirements for the degree of Master of Science.
© 1985 Published by Elsevier Inc.