Aims: Lateral channels may represent a clinical problem
frequently related with the inability to be sealed. Secondary and refractary
lesions are consequences of the permanence of bacteria in lateral channels. The
aim of this study was to evaluate the ability of a warm gutta-percha sealing
system, Thermafil (Dentsply, USA), to seal the lateral channels, in presence or absence of smear layer.
Material & Methods: Different irrigations were used in two
different groups of extracted human incisors: 1) NaOCl 5% and H2O2
3% (Ogna, Italy) (n= 19); 2) NaOCl 5% and EDTA 17% (n = 19). A conventional coronal
preparation with Gates-Glidden burs and manual crown-down technique was used.
Only K-files (FKG, Swiss) were used to obtain an apical gauge of # 30 or #
35 depending from the teeth anatomy. After channel filling with AH plus (DentSply, USA) and Thermafil (Dentsply, Maillefer,
Swiss) all teeth were immersed in 85% formic acid solution for 14 days to
obtain the clearing of the roots. An optical stereomicroscope was used to
detect the number, the diameter, the lenght of lateral channels. Results: (mean length,
micron, of lateral channels and dispersion)
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NaOCl and H202 middle third
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NaOCl and H202 apical third
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NaOCl and EDTA middle third
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NaOCl and EDTA apical third
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N. observations
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19
|
32
|
27
|
44
|
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Mean Length
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757.37
|
161.72
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373.89
|
253.86
|
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Dispersion
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1519.67
|
228.11
|
540.42
|
336.47
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