The effect of immediate and delayed post-space preparation using extended working time root canal sealers on apical leakage

Abstract

KEYWORDS apical seal; extended working time root canal sealers; post-space preparation; zinc oxideeeugenol sealerAbstract Background/purpose: The purpose of this study was to compare the effect of different post-space preparation time intervals on the apical sealing ability of filling material using two different extended setting time root canal sealers. Materials and methods: A total of 100 single-canal teeth were incrementally cleaned with crown-down instrumentation using K3 rotary nickeletitanium instruments and randomly divided into four groups. There were 30 teeth in the experimental groups (Groups 1e3) and 10 teeth in the control group (Group 4). We obturated the teeth using a warm gutta-percha vertical compaction technique with pulp canal sealer (Group 1), Tubli-Seal EWT (Group 2), and pulp canal sealer EWT (Group 3). We then stored all the specimens in 100% humidity at 37 C for 1 week. We used heated pluggers to create post space at three different intervals postobturation (i.e., immediately after obturation, on Day 3, and on Day 7), leaving 5-mm gutta-percha filling at the apices. We then immersed the teeth in 2% methylene blue solution for 72 hours, and finally sectioned them longitudinally into two halves. The amount of apical dye leakage was measured under a stereomicroscope. Results:The results showed no significant difference (P > 0.05) in dye leakage between the standard and extended working time root canal sealers. Apical leakage tended to increase more severely in Group 1 at the three different intervals was considered. Conclusion: Extended working time root canal sealers do not affect microleakage results using a warm gutta-percha vertical compaction technique. The sealing ability of extended working

The Effect of Time of Post Space Preparation on the Seal and Adaptation of Resilon-Epiphany Se & Gutta-percha-Ah Plus Sealer- An –Sem Study

“…Immediate post space preparation by the same operator, who has just finished obturating the canal, can be done under rubber dam, using the same aseptic conditions and additional advantage of this protocol is that the condensation of the remaining gutta-percha can be assessed and improved if necessary. Finally the familiarity of the operator with the root canal system minimizes the risk of perforation or stripping [7,9].…”

“…They also found that leakage could occur at the interface between the sealer and dentin, sealer and gutta-percha, through the sealer itself, or by dissolution of the sealer [6]. In addition, One of the study compared two commonly used root canal sealers to evaluate whether post placement before or after the sealer setting shows a difference in post stability, and concluded that there is no significant difference [7]. Another study done with fiber post with 5-8 mm of gutta-percha & resin bonding sealer, there was 50 % improvement in prevention of leakage [8].…”

Comparative study of the effect on apical sealability with different levels of remaining gutta-percha in teeth prepared to receive posts: An in vitro study

“…It is possible that the residual filling may be dislodged, twisted or vibrated during postspace preparation which might create a pathway for bacterial invasion and reinfection of the root canal system. [ 1 2 ]…”

“…Authors of the most previous studies agree that keeping 4–5 mm of the obturating material in the apical region constitutes a safe margin. [ 2 7 ]…”

Post space preparation timing of root canals sealed with AH Plus sealer

“…The objectives of endodontic therapy are to eliminate microorganisms from the root canal system, and to establish an effective barrier to prevent further passage of microorganisms or their byproducts to periapical tissues. 1 2 3 4 Thus, complete obturation of the root canal system and creation of an ‘apical’ seal are important for successful endodontic treatment. 5 6 7 8…”