Restor Dent Endod.  2017 Feb;42(1):27-33. 10.5395/rde.2017.42.1.27.

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

Affiliations
  • 1Department of Dental Science, Graduate School, Kyungpook National University, Daegu, Korea.
  • 2Department of Conservative Dentistry, Kyungpook National University, Daegu, Korea.
  • 3Department of Dental Biomaterials, School of Dentistry, Kyungpook National University, Daegu, Korea. tykwon@knu.ac.kr
  • 4Institute for Biomaterials Research and Development, Kyungpook National University, Daegu, Korea.

Abstract


OBJECTIVES
To determine the optimal timing for post space preparation of root canals sealed with epoxy resin-based AH Plus sealer in terms of its polymerization and influence on apical leakage.
MATERIALS AND METHODS
The epoxy polymerization of AH Plus (Dentsply DeTrey) as a function of time after mixing (8, 24, and 72 hours, and 1 week) was evaluated using Fourier transform infrared (FTIR) spectroscopy and microhardness measurements. The change in the glass transition temperature (Tg ) of the material with time was also investigated using differential scanning calorimetry (DSC). Fifty extracted human single-rooted premolars were filled with gutta-percha and AH Plus, and randomly separated into five groups (n = 10) based on post space preparation timing (immediately after root canal obturation and 8, 24, and 72 hours, and 1 week after root canal obturation). The extent of apical leakage (mm) of the five groups was compared using a dye leakage test. Each dataset was statistically analyzed by one-way analysis of variance and Tukey's post hoc test (α = 0.05).
RESULTS
Continuous epoxy polymerization of the material with time was observed. Although the T(g) values of the material gradually increased with time, the specimens presented no clear T(g) value at 1 week after mixing. When the post space was prepared 1 week after root canal obturation, the leakage was significantly higher than in the other groups (p < 0.05), among which there was no significant difference in leakage.
CONCLUSIONS
Poor apical seal was detected when post space preparation was delayed until 1 week after root canal obturation.

Keyword

AH Plus; Polymerization; Post and core technique; Root canal preparation

MeSH Terms

Bicuspid
Calorimetry, Differential Scanning
Dataset
Dental Pulp Cavity*
Fourier Analysis
Glass
Gutta-Percha
Humans
Polymerization
Polymers
Post and Core Technique
Root Canal Obturation
Root Canal Preparation
Spectrum Analysis
Transition Temperature
Gutta-Percha
Polymers

Figure

  • Figure 1 Polymerization of AH Plus as a function of time after mixing, monitored by Fourier transform infrared (FTIR) spectroscopy. The extent of epoxy polymerization was determined by the peak at 916 cm-1 in reference to the peak at 1,183 cm-1. The dashed line denotes the FTIR spectrum of the freshly mixed AH Plus. G8H, G24H, G72H, and G1W: 8, 24, and 72 hours, and 1 week after mixing, respectively.

  • Figure 2 Representative DSC scans of AH Plus after mixing resin specimens at 8 (G8H), 24 (G8H), and 72 (G8H) hours, and 1 week (G1W) after root canal obturation. For each group, a single glass transition temperature (marked by asterisks on the curves) was determined at the midpoint of the temperature range, bounded by the tangents to the two flat regions of the heat flow curve. DSC, differential scanning calorimetry.

  • Figure 3 Individual data plot of the apical leakage values for each group (n = 10). Only G1w showed significantly greater apical leakage than the other groups (p < 0.05), which presented no significant differences in value from one another (p > 0.05).


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