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De-Deus G, Arashiro FN, Souza EM, Silva EJNL, Guimarães TDM, Maciel ACDC, Oliveira DDS, Belladonna FG, Lopes RT, Versiani MA. The impact of long-term storage conditions on the development of experimental dentinal microcracks. AUST ENDOD J 2024; 50:60-68. [PMID: 37876340 DOI: 10.1111/aej.12806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 07/27/2023] [Accepted: 10/16/2023] [Indexed: 10/26/2023]
Abstract
This study evaluated the impact of long-term storage conditions (medium and time) on the development of experimental dentinal microcracks through micro-computed tomography. Sixty freshly extracted premolars were stored in formalin, water, or dry conditions (n = 20) and scanned after 72 h, 30 days, 6 months and 3 years of extraction. The effect of the storage medium and time on the occurrence of dentinal defects was statistically evaluated. A total of 211 000 images were screened revealing the existence of 11 519 slices with dentinal defects. Dry conditions significantly contributed to the development of new defects in all time points. During the 3-year follow-up period, no new defects were detected in the teeth that were stored in water and, in a single tooth, in the formalin group, after 6 months of storage.
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Affiliation(s)
- Gustavo De-Deus
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Fabio Nakao Arashiro
- Department of Endodontics, School of Dentistry Federal University of Mato Grosso do Sul, Campo Grande, Brazil
| | - Erick Miranda Souza
- Department of Dentistry II, Federal University of Maranhão, São Luís, Maranhão, Brazil
| | - Emmanuel João Nogueira Leal Silva
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
- Department of Endodontics, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil
| | | | | | | | | | - Ricardo Tadeu Lopes
- Nuclear Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marco Aurélio Versiani
- Dental Specialty Center, Brazilian Military Police, Belo Horizonte, Minas Gerais, Brazil
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Alberto APL, Oliveira DDS, Oliveira HE, Maciel ACDC, Belladonna FG, Silva EJNLD. Does sodium thiosulphate avoid the formation of the brown-coloured precipitate as an intermediate irrigant between NaOCl and chlorhexidine? AUST ENDOD J 2021; 48:72-76. [PMID: 34494676 DOI: 10.1111/aej.12562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/26/2021] [Indexed: 11/29/2022]
Abstract
This study evaluated the efficacy of sodium thiosulphate (ST) as an intermediate irrigant between sodium hypochlorite (NaOCl) and chlorhexidine (CHX) to avoid the formation of the brown-coloured precipitate. The in vitro experiment used microtubes to test the mixture of 2.5% NaOCl, 2% CHX and 5% ST solutions, varying their order and time of addition. In the ex vivo experiment, 10 bovine teeth were divided into two groups according to the intermediate irrigant used: distilled water (control) and 5% ST (experimental). Colour change occurred in all microtubes after interaction between solutions. While the precipitate was not observed in the experimental group, it was seen in all specimens of the control group. The 5% ST was able to prevent the formation of the brown-coloured precipitate in the ex vivo experiment, whereas it only prevented its in vitro formation when the waiting time for adding CHX was 10, 15 and 20 min.
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Moreira EJL, Antunes HDS, Vieira VTL, Cavalcante DM, Oliveira HE, Oliveira DDS, DE-Deus G, Silva EJNLD. Effects of clinical use of NiTi reciprocating instruments on cyclic and torsional resistance, and on roughness. Braz Oral Res 2021; 35:e021. [PMID: 33605352 DOI: 10.1590/1807-3107bor-2021.vol35.0021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 10/08/2020] [Indexed: 11/22/2022] Open
Abstract
The aim of the present study was to evaluate the cyclic fatigue, torsional resistance and surface roughness of Reciproc R25 instruments in four different situations, namely as new instruments and as instruments tested after clinical preparation of one, two or three maxillary molars with four root canals. The total time required to perform each root canal preparation was recorded. Cyclic fatigue resistance was determined by the time to fracture using a customized testing device (n = 10 per group). The torsional test evaluated the torque and angle of rotation to failure according to ISO 3630-1 (n = 10 per group). The roughness of the working parts of new and used instruments was evaluated with a profilometer (n = 5 per group). Statistical analysis was performed using one-way ANOVA and Tukey's test. The level of significance was set at 5%. No fractures or deformations were observed after clinical use. Higher preparation time was needed during the third use of the instruments for all root canals (p < 0.05). There were no significant differences among the groups in regard to either cyclic fatigue or torsional resistance (p > 0.05). Regarding the roughness measurements, groove depth was higher on new and one- versus two- or three-maxillary-molar-prepared instruments (p < 0.05). It can be concluded that the clinical use of Reciproc instruments increased preparation time and decreased surface roughness. However, clinical use did not affect the cyclic fatigue or torsional resistance of the Reciproc instruments.
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Affiliation(s)
- Edson Jorge Lima Moreira
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Henrique Dos Santos Antunes
- Universidade do Grande Rio - Unigranrio, School of Dentistry , Department of Endodontics , Rio de Janeiro , RJ , Brazil
| | - Victor Talarico Leal Vieira
- Universidade do Grande Rio - Unigranrio, School of Dentistry , Department of Endodontics , Rio de Janeiro , RJ , Brazil
| | - Daniele Moreira Cavalcante
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Henrique Eduardo Oliveira
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Diogo da Silva Oliveira
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Gustavo DE-Deus
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
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De-Deus G, Cardoso ML, Simões-Carvalho M, Silva EJNL, Belladonna FG, Cavalcante DM, Oliveira DDS, Souza EM, Lopes RT, Versiani MA. Glide Path with Reciprocating Driven Pathfinding Instrument: Performance and Fracture Rate. J Endod 2020; 47:100-104. [PMID: 33045262 DOI: 10.1016/j.joen.2020.09.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 09/04/2020] [Accepted: 09/10/2020] [Indexed: 11/15/2022]
Abstract
INTRODUCTION This study assessed the number of mesial and distal canals of mandibular molars in which the R-Pilot pathfinding reciprocating instrument reached the working length (WL) during macro glide path procedure. Fracture and deformation rates were also evaluated. METHODS One hundred fifty-six root canals of 52 teeth were scouted to the length of the apical foramen. Then the R-Pilot instrument was positioned at the canal orifice and activated. The instrument was moved by using a pecking motion and light apical pressure. This procedure was repeated in an attempt to reach the WL. The type of fracture and/or instrument deformation was assessed by scanning electron microscopy, whereas the roots with fractured instruments were scanned through micro-computed tomography. The percentage frequency distribution of fractures, deformations, and root canals in which the R-Pilot reached the WL were recorded and statistically compared by using the Pearson's χ2 test with α = 5%. RESULTS R-Pilot instruments reached the WL in 139 root canals (89.10%), and χ2 test showed a significant difference between the observed frequencies and the expected frequencies (χ2 = 95.41, P = .000). The observed frequencies of fractures (2.56%) and deformations (1.92%) were also significantly lower than the expected (fracture: χ2 = 140.41, P = .000; deformation: χ2 = 144.23, P = .000). Fractures occurred mostly at the apical and curved parts of the root canals. CONCLUSIONS R-Pilot reached the WL in 89.10% of the root canals of mandibular molars with fracture and deformation rates of 2.56% and 1.92%, respectively.
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Affiliation(s)
- Gustavo De-Deus
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Milla Lessa Cardoso
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Marco Simões-Carvalho
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Emmanuel J N L Silva
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil; Department of Endodontics, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil
| | | | | | | | - Erick Miranda Souza
- Department of Dentistry II, Federal University of Maranhão, São Luís, Maranhão, Brazil
| | - Ricardo Tadeu Lopes
- Nuclear Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marco Aurélio Versiani
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
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Silva EJNL, Ehrhardt IC, Sampaio GC, Cardoso ML, Oliveira DDS, Uzeda MJ, Calasans-Maia MD, Cavalcante DM, Zuolo ML, De-Deus G. Determining the setting of root canal sealers using an in vivo animal experimental model. Clin Oral Investig 2020; 25:1899-1906. [DOI: 10.1007/s00784-020-03496-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 08/03/2020] [Indexed: 10/23/2022]
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De-Deus G, Ferreira CB, Oliveira DDS, de Queiroz TF, Souza EM, de Gouvêa CVD, Silva EJNL. Resistance of Hydraulic Calcium Silicate Cements to Dislodgment in Short- and Long-term Assessment. J Adhes Dent 2016; 18:157-60. [PMID: 27022643 DOI: 10.3290/j.jad.a35840] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE To investigate the resistance to dislodgment produced by Biodentine (Septodont) and White-MTA (Angelus) after immersion in phosphate-buffered saline (PBS) for different durations. MATERIALS AND METHODS Dentin disks 1 ± 0.1 mm thick were obtained from the middle third of the roots of 6 human maxillary canines. On the coronal surface of each dentin disk, four 0.8-mm-diameter holes were drilled. Then the slices were halved using a low-speed saw diamond disk, and the two holes in each half were filled with one of the two tested materials. Each filled half was immersed in PBS solution (pH 7.2) either for 7 days (short term) or 60 days (long term) at 37°C. The push-out test was performed after both time periods. A general linear model (GLM) for repeated measures ANOVA was used to verify the effect of the material and duration of contact with PBS on the push-out strength. The material was considered as the within-subject contrast and the contact duration as the between-subjects effect (p < 0.05). RESULTS Repeated measures GLM indicated a significant impact of material and time on the push-out strength of the samples (p = 0.000 and p = 0.033, respectively). Biodentine significantly improved the push-out strength compared to MTA at both times (p = 0.000). The lack of significance in the interaction between material and time indicates that PBS immersion positively influenced the push-out values of both tested materials. CONCLUSION Long-term PBS immersion positively influenced the resistance to dislodgement from dentin of all cements tested. The Biodentine cement provided greater resistance to push-out force than did the MTA.
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