Restor Dent Endod.  2016 May;41(2):114-120. 10.5395/rde.2016.41.2.114.

Push-out bond strength and dentinal tubule penetration of different root canal sealers used with coated core materials

• Deniz Sungur D
• Purali N
• CoÅŸgun E
• Calt S

• KMID: 2163293
• DOI: http://doi.org/10.5395/rde.2016.41.2.114

Abstract

OBJECTIVES
The aim of this study was to compare the push-out bond strength and dentinal tubule penetration of root canal sealers used with coated core materials and conventional gutta-percha.
MATERIALS AND METHODS
A total of 72 single-rooted human mandibular incisors were instrumented with NiTi rotary files with irrigation of 2.5% NaOCl. The smear layer was removed with 17% ethylenediaminetetraacetic acid (EDTA). Specimens were assigned into four groups according to the obturation system: Group 1, EndoRez (Ultradent Product Inc.); Group 2, Activ GP (Brasseler); Group 3, SmartSeal (DFRP Ltd. Villa Farm); Group 4, AH 26 (Dentsply de Trey)/gutta-percha (GP). For push-out bond strength measurement, two horizontal slices were obtained from each specimen (n = 20). To compare dentinal tubule penetration, remaining 32 roots assigned to 4 groups as above were obturated with 0.1% Rhodamine B labeled sealers. One horizontal slice was obtained from the middle third of each specimen (n = 8) and scanned under confocal laser scanning electron microscope. Tubule penetration area, depth, and percentage were measured. Kruskall-Wallis test was used for statistical analysis.
RESULTS
EndoRez showed significantly lower push-out bond strength than the others (p < 0.05). No significant difference was found amongst the groups in terms of percentage of sealer penetration. SmartSeal showed the least penetration than the others (p < 0.05).
CONCLUSIONS
The bond strength and sealer penetration of resin-and glass ionomer-based sealers used with coated core was not superior to resin-based sealer used with conventional GP. Dentinal tubule penetration has limited effect on bond strength. The use of conventional GP with sealer seems to be sufficient in terms of push-out bond strength.

Keyword

Adhesion; Coated core; Monoblock; Root canal sealer; Tubule penetration

MeSH Terms

Dental Pulp Cavity*
Dentin*
Edetic Acid
Glass
Gutta-Percha
Humans
Incisor
Rhodamines
Smear Layer
Edetic Acid
Gutta-Percha
Rhodamines

Figure

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  Figure 1 Measurement of sealer penetration area using LSM Image Examiner Software (Carl Zeiss).

• 

  Figure 2 Measurement of percentage and maximum depth of sealer penetration using LSM Image Examiner Software (Carl Zeiss).

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