Post space preparation timing of root canals sealed with AH Plus sealer
Restorative Dentistry & Endodontics
; : 27-33, 2017.
Article
in En
| WPRIM
| ID: wpr-67754
Responsible library:
WPRO
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.
Key words
Full text:
1
Index:
WPRIM
Main subject:
Polymers
/
Root Canal Obturation
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Spectrum Analysis
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Bicuspid
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Calorimetry, Differential Scanning
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Post and Core Technique
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Root Canal Preparation
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Dental Pulp Cavity
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Transition Temperature
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Polymerization
Limits:
Humans
Language:
En
Journal:
Restorative Dentistry & Endodontics
Year:
2017
Type:
Article