The apical seal of root canal sealing cements using a radionuclide detection technique

Abstract

The aim of this study was to evaluate the apical seal obtained with various root canal sealing cements using a new method based on the use of a radionuclide and an external detection technique. A total of 150 maxillary incisors and canines, which had been kept in saline solution, were used. The root canals were instrumented with a stepback technique and circumferential filing. Six experimental groups and two control groups were randomly formed. Each experimental group was obturated by a lateral condensation technique with gutta-percha points and a different sealing cement (two based on zinc oxide-eugenol cement, two based on resins and two on calcium hydroxide); the positive control used gutta-percha without sealing cement, while in the negative control the apex was covered with nail varnish, leaving the root canal empty. The apical leakage was measured using an external detection technique after submerging the root apices in a solution containing the radioisotope metastable 99Tc. No leakage was observed in the negative control group. There was a large difference between the leakage observed in the positive control group and the experimental groups. The best seal was obtained using Sealapex cement, which differed significantly from AH26, Tubli-Seal and Diaket; there was no significant difference between the latter. The poorest results were obtained with Endomethasone and CRCS; there was a significant difference between these and the previous three sealing cements.

The Quantitative Evaluation of Apical Sealing of Four Endodontic Sealers

“…Some studies report the apical seal of resin-based sealers to be superior to that of other sealers (17,18). In contrast, other studies have shown that the calcium hydroxide based sealer, Sealapex, provides a significantly better seal than others, including resin-based sealers (19,20). In our study, AH Plus showed also significantly more leakage when compared to Sealapex but there was no significant difference with Rocanal 2 and RC Sealer based sealers for each period.…”

Evaluation of canal filling after using two warm vertical gutta‐percha compaction techniques in vivo: a preliminary study

“…1967, Nguyen 1987, Ingle & Bakland 1994). Gutta‐percha and endodontic sealers are currently the most common materials used to fill root canals (Nguyen 1987, Canalda‐Sahli et al. 1992).…”

Temperature change within gutta-percha induced by the System-B Heat Source

“…The combination of gutta‐percha with sealer is the most common method of filling the root‐canal system (Canalda‐Sahli et al . 1992).…”