Intracanal temperature rise evaluation during the usage of the System B: replication of intracanal anatomy

Abstract

Positioning the plugger close to WL and a temperature rise of 6 degrees C were necessary to obtain replication of intracanal anatomy. A mean temperature rise of 4 degrees C at 2 mm from WL (group B) resulted in no replication of intracanal anatomy. Further studies simulating clinical conditions are necessary.

An ex vivo comparison of three different gutta‐percha cones when compacted at different temperatures: rheological considerations in relation to the filling of lateral canals

“…Despite this small resistance, only at temperatures exceeding 60°C did the gutta-percha penetrate more than 1.2 mm into the lateral canals, and only then in three cases: with Mynol cones at levels C and A, and with Hygenic cones at level C. At 52°C the penetration was always <1 mm. In addition, other studies (Venturi et al 2002, Villegas et al 2005) recorded inconsistent apical temperature increases when a heated tip was pushed to within 0.5-4 mm of the apex. Therefore, the available data indicates that gutta-percha might become plasticized by the Schilder technique and flow to fill irregular spaces only in the coronal and middle thirds, where Marlin & Schilder (1973) recorded temperatures up to 80°C, whilst a more crystalline state is maintained in the apical third.…”

Effect of Heat Application on Adhesion of Epoxy Resin Sealer

“…The Schilder warm vertical technique has been shown to induce temperatures ranging from 45°C-80°C within the root canal (13), whereas the Obtura II heated gutta-percha system produces intracanal temperatures of 40°C-57°C (14). Use of System B at 200°C with tip insertion, 2 or 4 mm from the apical foramen, results in temperature increases of 14°C and 6°C, respectively (15). Finally, the mean intracanal temperature induced during warm lateral condensation with a Touch 'n Heat (SybronEndo) unit ranges from 8°C-65°C above room temperature (16).…”

“…The thermocouple wires were connected to a data logger (TC-08 Thermocouple Data Logger; Pico Technology, Cambridgeshire, UK), and the data were monitored and transferred in real time to a personal computer. The temperature induced in the sealer, ϳ80°C, was equivalent to the average maximum reported temperature induced during warm gutta-percha obturation techniques (13)(14)(15)(16)(17). After sealer placement, the entire assembly (plate, dentin specimen, and bonded sealer) was transferred to an incubator (37°C, 100% relative humidity) for 1 week.…”

Thermoplastic Properties of Endodontic Gutta-percha: A Thermographic In Vitro Study

“…However, our results showed that only the apical 1 to outmost 2.1 mm of the gutta-percha cone apically from the ''binding point'' are prone to plastically deform, thus compromising the apical adaptation and sealing quality of the gutta-percha (17).…”

“…The method allows establishing the temperature of any determined pixel in the resulting images at any time. Thus, the reproducibility of the method is given, and the temperature determination accuracy is more reliable in comparison with methods in which thermocouples are used (11,(16)(17)(18)(19). The precision of the thermocouple methodology can be increased by using a higher a number of thermocouples (20); yet, as a result of the space restrictions inherent in the root or root canal wall and the fact that thermocouples provide only point data, this methodology has considerable limitations.…”