Micro-computed tomography and bond strength analysis of different root canal filling techniques.
BACKGROUND
The aim of this study was to evaluate the quality and bond strength of three root filling techniques (lateral compaction, continuous wave of condensation and Tagger's Hybrid technique [THT]) using micro-computed tomography (CT) images and push-out tests, respectively.


METHODS
Thirty mandibular incisors were prepared using the same protocol and randomly divided into three groups (n=10): Lateral condensation technique (LCT), continuous wave of condensation technique (CWCT), and THT. All specimens were filled with Gutta-percha (GP) cones and AH Plus sealer. Five specimens of each group were randomly chosen for micro-CT analysis and all of them were sectioned into 1 mm slices and subjected to push-out tests.


RESULTS
Micro-CT analysis revealed less empty spaces when GP was heated within the root canals in CWCT and THT when compared to LCT. Push-out tests showed that LCT and THT had a significantly higher displacement resistance (P<0.05) when compared to the CWCT. Bond strength was lower in apical and middle thirds than in the coronal thirds.


CONCLUSIONS
It can be concluded that LCT and THT were associated with higher bond strengths to intraradicular dentine than CWCT. However, LCT was associated with more empty voids than the other techniques.
Juliane
J
Nhata
Department of Endodontics, Paranaense University - UNIPAR, Francisco Beltrão, Paraná, Brazil.
Ricardo
R
Machado
Luiz Pascoal
LP
Vansan
Antonio
A
Batista
Gilson
G
Sidney
Tiago Pereira
TP
Rosa
Emmanuel João Nogueira
EJ
Leal Silva
D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000000981:diagnostic imaging*; D003799:Dental Stress Analysis; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D066298:In Vitro Techniques; D007180:Incisor / Q000000981:diagnostic imaging; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods*; D055114:X-Ray Microtomography
D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; D006171:Gutta-Percha