Background. The new gutta−perchas well−known as “alpha type”, compared with the traditional ones in cones, have a fusion interval close to the body temperature. They are fluid and adhesive and get cold more rapidly. They have a high rigidity value at room temperature. Objectives. The aim of this work is to study the thermal profile of the samples of traditional and preheated gutta− perchas. Material and Methods. We chose the following gutta−percha products to complete our work: a synthetic gutta− percha (Aldrich), an alpha type Thermafil gutta−percha, an alpha type Microseal gutta−percha, a Microseal gutta− percha in cones (beta), a VDW gutta−percha in cones (beta). The samples have been submitted to the TMA analy− sis (Thermo Mechanical Analysis). Results. The study of the curves led us to examine the three dimensional volumetric variations in the gutta−percha mass registered in different times. 10 thermal cycles for each sample from 5°C to 45 °C recorded the thermal stress of the commercial dental preparations. Gutta-perchas in cones registered a smaller mass variation compared to the one disclosed with the preheated gutta-perchas. Conclusions. Preheated gutta−perchas proved to have more thermal sensitivity and experience a mass loss during every cycle of temperature variation compared with the other gutta−perchas.
File in questo prodotto:
Non ci sono file associati a questo prodotto.