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      An in-vitro comparative micro-computed tomographic evaluation of three obturation systems

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          Abstract

          Adaptation of obturation material to dentine walls is essential for the success of root canal treatment. AIM: To evaluate and compare the adaptation of gutta-percha of three obturation systems, using micro-computed tomography. METHODS: The roots of 90 central incisors were shaped with ProTaper Universal (Dentsply) files, irrigated with 1ml 5.25% sodium hypochlorite and flushed with 5ml 17% EDTA. The roots were randomly divided into: Group 1: GuttaCore obturation, Group 2: ProTaper single-cone obturation, Group 3: Thermafil obturation. All canals were sealed with AH Plus (Dentsply). A v|tome|x 240D micro-CT scanner was used to scan each root at 15μιτι resolution. The size of voids and gaps observed at 1mm, 3mm and 6mm axial sections from the apex were compared, as was the volume of cement around the gutta-percha. RESULTS: Group 2 (Protaper) had statistically significantly greater incidence of voids and of surrounding cement than either Thermafil or GuttaCore carrier based systems (Kruskal-Wallis p<0.001). CONCLUSION: Both carrier-based techniques allowed for better sealing ability in root canals compared with single-cone gutta-percha obturation although none of the materials were gap free, especially at 1mm from apex. CLINICAL SIGNIFICANCE: Both carrier-based techniques show good sealing ability and are appropriate for daily endodontic practice.

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          Most cited references 23

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          Use of nickel-titanium rotary PathFile to create the glide path: comparison with manual preflaring in simulated root canals.

          The study compared changes to canal curvature and incidence of canal aberrations after preflaring with hand K-files or with nickel-titanium rotary PathFile in S-shape Endo Training Blocks. The influence of the operator's expertise was also investigated. One hundred training blocks were colored with ink, and preinstrumentation images were acquired digitally. Preflaring was performed by an endodontist with PathFile (group 1) and hand stainless steel K-files #10-15-20 (group 2); an inexpert clinician performed preflaring with PathFile (group 3) and hand stainless steel K-files (group 4). Preinstrumentation and postinstrumentation images were superimposed to evaluate the outcomes investigated. Differences in canal curvature modification and incidence of canal aberration were analyzed with the Kruskall-Wallis plus post hoc tests and by the Monte Carlo method, respectively, (P .05), whereas the inexpert clinician produced more conservative shaping with Pathfiles than did the expert with manual preflaring (P < .01).
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            Influence of manual preflaring and torque on the failure rate of ProTaper rotary instruments.

            We evaluated the influence of manual preflaring and torque on the failure rate of rotary nickel-titanium ProTaper instruments Shaping 1 (S1), Shaping 2 (S2), Finishing 1 (F1), and Finishing 2 (F2). These factors were evaluated using an in vitro method by calculating the mean number of Endo-Training-Blocks shaped before file breakage under different conditions. Group A (S1 on simulators with no preflaring) shaped 10 blocks before failure, group B (S1 on manually preflared simulators) shaped 59 blocks (p<0.01 versus group A), group C (S2 with low torque) shaped 28 blocks, group D (S2 with high torque) shaped 48 blocks (p<0.01 versus group C), group E (F1 with low torque) shaped eight blocks, group F (F1 with high torque) shaped 23 blocks (p<0.01 versus group E), group G (F2 with low torque) shaped four blocks, and group H (F2 with high torque) shaped 11 blocks (p<0.01 versus group G). Manual preflaring creates a glide path for the instrument tip and is a major determinant in reducing the failure rate of these rotary nickel-titanium files. All instruments worked better at high torque.
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              Evaluation of root canal obturation: a three-dimensional in vitro study.

              The aim of the study was to measure percentage of volume of voids and gaps in root canals obturated with different obturation materials by using micro-computed tomography (micro-CT). Forty-eight single-rooted teeth were collected and decoronated, and root canals were prepared by using rotary files. The roots were randomly allocated into 4 groups, and each group was obturated by using cold lateral compaction with a different material (gutta-percha and TubliSeal sealer, EndoRez points and EndoRez sealer, RealSeal points and RealSeal sealer, and a gutta-percha point and GuttaFlow sealer). Roots were scanned with micro-CT, and volume measurements for voids and gaps in the obturated roots were carried out by using specialized CT software. Percentage of gaps and voids was calculated. Statistical analysis showed that gutta-percha exhibited an overall significantly lower percentage (1.02%) of voids and gaps. The present study showed that none of the root canal filled teeth were gap-free. Roots filled with gutta-percha showed less voids and gaps than roots filled with the remaining filling materials.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                sadj
                South African Dental Journal
                S. Afr. dent. j.
                The South African Dental Association (SADA) (Johannesburg, Gauteng, South Africa )
                0011-8516
                0375-1562
                May 2018
                : 73
                : 4
                : 216-220
                Affiliations
                Cape Town orgnameUniversity of the Western Cape orgdiv1Faculty of Dentistry orgdiv2Department of Restorative Dentistry South Africa
                orgnameSefeko Makgatho Health Science University orgdiv1Faculty of Dentistry orgdiv2Department of Prosthodontics South Africa
                Article
                S0011-85162018000400010

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 25, Pages: 5
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