Post space preparation timing of root canals sealed with AH Plus sealer.
- Author:
Hae Ri KIM
1
;
Young Kyung KIM
;
Tae Yub KWON
Author Information
- Publication Type:Original Article
- Keywords: AH Plus; Polymerization; Post and core technique; Root canal preparation
- MeSH: 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
- From:Restorative Dentistry & Endodontics 2017;42(1):27-33
- CountryRepublic of Korea
- Language:English
- 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.
