Efficacy of different solvents in removing gutta-percha from curved root canals: A micro-computed tomography study

The present study aimed to evaluate adaptation of the single gutta-percha cone on root canal walls prepared with the two systems, the XP-endo Shaper (XPS; FKG Dentaire, La Chaux-de-Fonds, Switzerland) and ProTaper Next systems (PTN; Dentsply Sirona, Ballaigues, Switzerland) by using micro-computed tomography (micro-CT) technology. Twenty long oval-shaped canals in mandibular incisors were scanned by micro-CT (Skyscan 1172; Bruker microCT, Kontich, Belgium). Two groups were divided into (n = 10) according to the canal preparation protocol: XPS group with an extra 45 s of instrumentation and PTN group. A gutta percha cone, with respect to the protocol used for each group (size 40, .04 taper, XPS and size 40, .06 taper, PTN) was adapted to the canal at the working length of all the samples, and all root canals were filled, using the single-cone technique. The mean values for volume of voids and percentage relative to the mentioned space were correspondingly higher in XPS group than they were PTN group, mean values for volume of voids (3.61 mm3 - 1.92 mm3) and for percentage of voids (39.25% - 23.28%), respectively, significant differences were recorded (p < 0.05) between the two groups (XPS and PTN, Student’s-t test for homogenous variances and Mann–Whitney test). The canals prepared with XPS, in the procedure performed with an extra 45 s of instrumentation, showed a higher volume of voids than those prepared with the PTN system, in obturation of the root canal with the single cone technique.

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Retracted: Micro-computed tomography evaluation of apical transportation and centring ability of Reciproc and WaveOne systems in severely curved root canals

International Endodontic Journal ◽

10.1111/iej.12436 ◽

2015 ◽

Vol 48 (8) ◽

pp. 814-814

Author(s):

D. A. de Meireles ◽

T. C. C. A. de Brito ◽

A. A. F. Marques ◽

A. D. B. Garrido ◽

L. F. R. Garcia ◽

...

Keyword(s):

Computed Tomography ◽

Micro Computed Tomography ◽

Root Canals ◽

Apical Transportation ◽

Curved Root Canals

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Comparison of Two Techniques for Selection of Master Gutta-Percha Cone Using Micro-Computed Tomography

Brazilian Dental Journal ◽

10.1590/0103-6440201302330 ◽

2013 ◽

Vol 24 (4) ◽

pp. 367-370 ◽

Cited By ~ 2

Author(s):

Joao Manoel Silva-Filho ◽

Aline Evangelista Souza-Gabriel ◽

Graziela Bianchi Leoni ◽

Samuel Henrique Camara De-Bem ◽

Edson Alfredo ◽

...

Keyword(s):

Computed Tomography ◽

Conventional Technique ◽

Filling Material ◽

Micro Ct ◽

Micro Computed Tomography ◽

Root Canals ◽

Gutta Percha ◽

Working Length ◽

Significant Difference ◽

Material Volume

This study used micro-computed tomography (micro-CT) to evaluate the fit of the master gutta-percha cone at time of cone fit, gutta-percha volume in the filling material, and the filling material volume in relation to the canal at the apical limit of the working length. Root canals of 20 maxillary central incisors were prepared with rotary instruments and distributed into two groups (n=10). The gutta-percha cone tip was either plasticized (apical thermal impression technique - ATI) or not (conventional technique - CT), and its apical fit was checked. The apical 1 mm of working length was examined with a micro-CT, canals were filled with gutta-percha and sealer, and new micro-CT scans were obtained. In CT, gutta-percha filled 35.83 ± 15.05% of the canal at cone selection and 38.72 ± 11.64% after filling. In ATI, these values were 23.14 ± 7.74% and 26.98 ± 20.40%, respectively. Gutta-percha volume in the filling material, and filling material volume in relation to the canal were, respectively, 61.28 ± 11.64% and 87.76 ± 9.98% for CT, and 73.00 ± 20.41% and 89.96 ± 9.08% for ATI. No significant difference was found between cone selection and after canal filling, for either CT (p=0.593) or ATI (p=0.4975). The techniques did not differ significantly with respect to gutta-percha volume in the filling material (p=0.132) and filling material volume in relation to the canal (p=0.612). An ideal fit of the master gutta-percha cone at working length was not achieved regardless of the cone selection technique, and the material-filled area was similar for both techniques.

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