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Rajnics Z, Mandel I, Nagy Á, Turzó K, Mühl A, Marada G. Effect of different parameters utilized for image guided endodontic root canal preparation on temperature changes: an in vitro study. BMC Oral Health 2024; 24:76. [PMID: 38218822 PMCID: PMC10787981 DOI: 10.1186/s12903-023-03799-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 12/18/2023] [Indexed: 01/15/2024] Open
Abstract
BACKGROUND Navigated endodontics is a cutting-edge technology becoming increasingly more accessible for dental practitioners. Therefore, it is necessary to clarify the ideal technical parameters of this procedure to prevent collateral damage of the surrounding tissues. There is a limited number of studies available in published scientific literature referencing the possible collateral thermal damage due to high-speed rotary instruments used in guided endodontic drilling. The aim of our study was to investigate the different drilling parameters and their effect upon the temperature elevations measured on the outer surface of teeth during guided endodontic drilling. METHODS In our in vitro study, 72 teeth with presumably narrow root canals were prepared using a guided endodontic approach through a 3D-printed guide. Teeth were randomly allocated into six different test groups consisting of 12 teeth each, of which, four parameters affecting temperature change were investigated: (a) access cavity preparation prior to endodontic drilling, (b) drill speed, (c) cooling, and (d) cooling fluid temperature. Temperature changes were recorded using a contact thermocouple electrode connected to a digital thermometer. RESULTS The highest temperature elevations (14.62 °C ± 0.60 at 800 rpm and 13.76 °C ± 1.24 at 1000 rpm) were recorded in the groups in which drilling was performed without prior access cavity preparation nor without a significant difference between the different drill speeds (p = 0.243). Access cavity preparation significantly decreased temperature elevations (p < 0.01) while drilling at 800 rpm (8.90 °C ± 0.50) produced significantly less heating of the root surface (p < 0.05) than drilling at 1000 rpm (10.09 °C ± 1.32). Cooling significantly decreased (p < 0.01) temperature elevations at a drill speed of 1000 rpm, and cooling liquid temperatures of 4-6 °C proved significantly (p < 0.01) more beneficial in decreasing temperature elevations (1.60 °C ± 1.17) than when compared with room temperature (21 °C) liquids (4.01 °C ± 0.22). CONCLUSIONS Based on the results of our study, guided endodontic drilling at drill speeds not exceeding 1000 rpm following access cavity preparation, with constant cooling using a fluid cooler than room temperature, provides the best results in avoiding collateral thermal damage during navigated endodontic drilling of root canals.
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Affiliation(s)
- Zsolt Rajnics
- Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary
| | - Iván Mandel
- Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary
| | - Ákos Nagy
- Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary
| | - Kinga Turzó
- Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary
| | - Attila Mühl
- Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary.
| | - Gyula Marada
- Dental School, Medical Faculty, University of Pécs, Tüzér u. 1, Pécs, H-7623, Hungary
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Soares CJ, Rodrigues MDP, Faria-e-Silva AL, Santos-Filho PCF, Veríssimo C, Kim HC, Versluis A. How biomechanics can affect the endodontic treated teeth and their restorative procedures? Braz Oral Res 2018; 32:e76. [DOI: 10.1590/1807-3107bor-2018.vol32.0076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 06/13/2018] [Indexed: 11/22/2022] Open
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Yamin PA, Pereira RD, Lopes FC, Queiroz AM, Oliveira HF, Saquy PC, Sousa-Neto MD. Longevity of bond strength of resin cements to root dentine after radiation therapy. Int Endod J 2018; 51:1301-1312. [PMID: 29729026 DOI: 10.1111/iej.12945] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 04/26/2018] [Indexed: 12/13/2022]
Abstract
AIM To evaluate the bond strength and adhesive interface between several resin cements and root dentine immediately and 6 months after radiotherapy. METHODOLOGY Sixty maxillary canines were selected and randomly assigned to two groups (n = 30): one group was not irradiated and the other one was subjected to a cumulative radiation dose of 60 Gy. The teeth were sectioned to obtain roots 16 mm long and the canals were prepared with the Reciproc system (R50) and filled using a lateral condensation technique with an epoxy resin sealer. Each group was divided into three subgroups (n = 10) according to the resin cement used for fibreglass fibre post cementation: RelyX-U200, Panavia-F2.0 and RelyX ARC. The posts were cemented in accordance with the manufacturer's recommendations. Three 1-mm-thick dentine slices were then obtained from each root third. The first two slices in the crown-apex direction of each third were selected for the push-out test. The failure mode after debonding was determined with a stereo microscope. The third slice from each root third was selected for scanning electron microscopy (SEM) analyses to examine the resin cement-dentine interface with 100, 1000, 2000 and 4000× magnification. Bond strength data were analysed by anova and Tukey's test (α = 0.05). RESULTS Significantly lower bond strength (P < 0.0001) was obtained after irradiation compared to nonirradiated teeth. RelyX-U200 cemented fibre posts had the higher bond strength (15.17 ± 5.89) compared with RelyX ARC (P < 0.001) and Panavia-F2.0 (P < 0.001). The evaluation after 6 months revealed lower bond strength values compared to the immediate values (P < 0.001) for irradiated and nonirradiated teeth. Cohesive failures occurred in the irradiated dentine. SEM revealed fractures, microfractures and fewer collagen fibres in irradiated root dentine. RelyX-U200 and Panavia-F2.0 were associated with a juxtaposed interface of the cement with the radicular dentine in irradiated and nonirradiated teeth, and for RelyX ARC, hybrid layer formation and tags were observed in both irradiated and nonirradiated teeth. CONCLUSION Radiation was associated with a decrease in the push-out bond strength and with lower resin cement/root dentine interface adaptation. Self-adhesive resin cement was a better alternative for fibre post cementation in teeth subjected to radiation therapy. The bond strength decreased after 6 months.
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Affiliation(s)
- P A Yamin
- Department of Restorative Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | - R D Pereira
- Department of Restorative Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | - F C Lopes
- Department of Restorative Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | - A M Queiroz
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, Ribeirão Preto, Brazil
| | - H F Oliveira
- Department of Internal Medicine, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - P C Saquy
- Department of Restorative Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | - M D Sousa-Neto
- Department of Restorative Dentistry, University of São Paulo, Ribeirão Preto, Brazil
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Da Silva NR, Aguiar GCR, Rodrigues MDP, Bicalho AA, Soares PBF, Veríssimo C, Soares CJ. Effect of Resin Cement Porosity on Retention of Glass-Fiber Posts to Root Dentin: An Experimental and Finite Element Analysis. Braz Dent J 2017; 26:630-6. [PMID: 26963208 DOI: 10.1590/0103-6440201300589] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 11/01/2015] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to evaluate the effect of porosity of self-adhesive resin on the stress distribution, post retention and failure mode of fiber post cemented to human root dentin. Ten human central upper incisors with circular root canal were selected. They were sectioned with 15 mm and were endodontically filled. The roots were scanned using micro-CT after post space preparation for root filling remaining evaluation. Fiber posts were cemented using self-adhesive resin cement (Rely X U200, 3M-ESPE). Two 1-mm-thick slices from the cervical, medium and apical thirds were scanned for resin cement bubbles volume measurements and submitted to a push-out test (PBS). Three operators using stereomicroscopy and confocal laser microscopy classified the failure mode. Stress distributions during the push-out test were analyzed using 3D finite element analysis. PBS values (MPa) were submitted to one-way ANOVA and Tukey's post hoc tests and the failure modes using the Kappa coefficient to assess inter-operator agreement. Chi-square test was used to determine significant differences between the methods ( = 0.05). Push-out bond strength was significantly affected by the bubbles presence in all root depth (p<0.05). The stress concentration was higher when the bubbles were present. Adhesive dentin/resin cement interface failure was the most frequent type of failure. Confocal microscopy was better than stereomicroscopy for failure analysis. Bubbles generated during resin cement insertion into the root canal negatively affect the stress distribution and the bond strength. The use of confocal microscopy is recommended for failure analysis.
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Affiliation(s)
- Natércia Rezende Da Silva
- Department of Restorative Dentistry and Dental Materials, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
| | - Grazielle Crystine Rodrigues Aguiar
- Department of Restorative Dentistry and Dental Materials, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
| | - Monise de Paula Rodrigues
- Department of Restorative Dentistry and Dental Materials, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
| | - Aline Aredes Bicalho
- Department of Restorative Dentistry and Dental Materials, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
| | - Priscilla Barbosa Ferreira Soares
- Department of Oral and Maxillofacial Surgery and Implantology, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
| | - Crisnicaw Veríssimo
- Department of Restorative Dentistry and Dental Materials, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
| | - Carlos José Soares
- Department of Restorative Dentistry and Dental Materials, BIAOR - Biomechanics Research Group, Dental School, UFU - Universidade Federal de Uberlandia, Uberlandia, MG, Brazil
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Gokturk H, Ozkocak I, Taskan MM, Aytac F, Karaarslan ES. In vitro evaluation of temperature rise during different post space preparations. Eur J Dent 2016; 9:535-541. [PMID: 26929693 PMCID: PMC4745236 DOI: 10.4103/1305-7456.172630] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Objective: The aim of this study was to evaluate temperature alterations on the outer root surface during post space preparation with six different post drills by using an infrared thermometer. Materials and Methods: Sixty extracted single-rooted human mandibular incisor teeth were used. After root canal obturation, the specimens were divided into six groups (n = 10). During post space preparation, the temperature rises were measured in the middle third of the roots using a noncontact infrared thermometer with a sensitivity of 0.1°C. The temperature data were transferred from the thermometer to the computer and were observed graphically. Results: The maximum temperature rise was observed in Snowpost 2 (29.95 ± 10.2°C) (P < 0.001), but there were no significant differences among Snowpost 2 (29.95 ± 10.2°C), Snowpost 1 (24.6 ± 8.0°C), and Relyx 2 (17.68 ± 9.1°C) (P > 0.05). Conclusions: Although water coolant used, the critical temperature rise was observed on the outer root surface in all post drill systems.
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Affiliation(s)
- Hakan Gokturk
- Department of Endodontics, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkiye
| | - Ismail Ozkocak
- Department of Endodontics, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkiye
| | - Mehmet Murat Taskan
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkiye
| | - Fatma Aytac
- Department of Restorative Dentistry, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkiye
| | - Emine Sirin Karaarslan
- Department of Restorative Dentistry, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkiye
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