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1.
BMC Oral Health ; 21(1): 179, 2021 04 07.
Artigo em Inglês | MEDLINE | ID: mdl-33827530

RESUMO

BACKGROUND: The aim of this study was to compare the influence of two novel reciprocating movements on the cyclic fatigue resistance of endodontic reciprocating files. METHODS: 30 Procodile® (Komet Medical, Lemgo, Germany) files were selected in this study and distributed according to the following study groups depending on the movements to be performed: ReFlex Dynamic (n = 10), ReFlex Smart (n = 10) and Reciproc (n = 10) reciprocating movement. These files were fixed to a specific dynamic cyclic fatigue device designed and manufactured by 3D impression to simulate the pecking motion performed by the operator. The time to failure and the number of cycles of in-and-out of the endodontic files was registered. The results were analyzed by ANOVA and Weibull statistics. RESULTS: Statistically significant differences were found when the number of cycles of in-and-out movement and the time to failure of ReFlex Dynamic and Reciproc reciprocating movement (p < 0.001) and between ReFlex Smart and Reciproc reciprocating movement (p < 0.001) were compared in pairs. However, no statistically significant differences were observed between time to failure and number of cycles of in-and-out movement of ReFlex Dynamic and ReFlex Smart reciprocating movement (p = 0.253). CONCLUSIONS: The ReFlex Smart reciprocating movement increased the cyclic fatigue resistance of endodontic reciprocating files compared with traditional reciprocating movement.


Assuntos
Preparo de Canal Radicular , Titânio , Desenho de Equipamento , Falha de Equipamento , Alemanha , Humanos , Teste de Materiais
2.
BMC Oral Health ; 21(1): 177, 2021 04 07.
Artigo em Inglês | MEDLINE | ID: mdl-33827540

RESUMO

BACKGROUND: We established an in vivo intraradicular biofilm model of apical periodontitis in pigs in which we compared the efficacy of different irrigant activation techniques for biofilm removal. METHODS: Twenty roots from the deciduous mandibular second premolar of 5 male pigs were used. After pulpectomy, canals were left open for 2 weeks and then sealed for 4 weeks to enable the development of an intracanal biofilm. The intraradicular biofilms was evaluated using SEM and bacterial 16S rRNA gene-sequencing. To investigate the efficacy of biofilm removal, root canal irrigations were performed using conventional needle, passive ultrasonic, subsonic, or laser-activated irrigation. Real-time PCR was conducted to quantitate the remaining biofilm components. Statistical analysis was performed using ANOVA followed by a Tukey kramer post-hoc test with α = 0.05. RESULTS: The pulp exposure model was effective in inducing apical periodontitis and SEM analysis revealed a multi-layer biofilm formation inside the root canal. 16S rRNA sequence analysis identified Firmicutes, Bacteroidetes, and Fusobacteria as the predominant bacterial phyla components, which is similar to the microbiome profile seen in humans. None of the tested irrigation techniques completely eradicated the biofilm components from the root canal, but the subsonic and laser-activated irrigation methods produced the lowest bacterial counts (p < 0.05). CONCLUSIONS: An experimental intraradicular biofilm model has been successfully established in pigs. Within the limitations of the study, subsonic or laser-activated irrigation demonstrated the best biofilm removal results in the pig system.


Assuntos
Cavidade Pulpar , Irrigantes do Canal Radicular , Animais , Biofilmes , Masculino , RNA Ribossômico 16S/genética , Preparo de Canal Radicular , Hipoclorito de Sódio , Suínos , Irrigação Terapêutica
3.
J Indian Soc Pedod Prev Dent ; 39(1): 74-78, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33885391

RESUMO

Background: In the last few decades, the availability of synchrotron sources has initiated revolutionary advances in X-ray imaging. Aims: The study aimed to evaluate the incidence of apical transportation after root canal preparation with ProTaper Gold (PTG), Hyflex electro discharge machining (HEDM), Reciproc (RPC), and WaveOne Gold (WOG) using synchrotron radiation-based micro-computed tomographic (SR-µCT) analysis. Materials and Methods: Forty mandibular molars were assigned to four experimental groups (n = 10) according to the file system used for the root canal preparation: Group 1: PTG (25/0.08), Group 2: HEDM (25/0.08), Group 3: RPC (25/0.08), and Group 4: WOG (25/0.07). The specimens were scanned on SR-µCT system before and after the root canal preparation. Apical transportation was assessed at 1, 2, 3, 4, and 5 mm section. Statistical Analysis: Two-way analysis of variance and Wilcoxon Mann-Whitney test was used. Results: No significant difference was found between the groups. Transportation in the mesial direction was of greater magnitude than distal transportation for all the files systems. Conclusion: SR-µCT can be used as a reliable diagnostic tool for further implications.


Assuntos
Níquel , Titânio , Cavidade Pulpar/diagnóstico por imagem , Humanos , Preparo de Canal Radicular , Síncrotrons , Microtomografia por Raio-X
4.
Chin J Dent Res ; 24(1): 49-54, 2021 Apr 23.
Artigo em Inglês | MEDLINE | ID: mdl-33890455

RESUMO

OBJECTIVE: To compare the accuracy of electronic apex locators in the presence of blood and CBCT images obtained with two different voxel sizes (0.125 mm and 0.25 mm) in determining root canal length up to the perforation area. METHODS: Forty extracted, single-rooted human teeth were selected and an artificial root perforation (0.4 ± 0.1 or 1.0 ± 0.2 mm diameter) was created in the middle third of the root. The actual root canal length up to the perforation area was determined under a stereomicroscope. CBCT images were obtained with a voxel size of 0.125 mm and 0.25 mm. The root canal length up to the perforation area was measured on CBCT images and recorded as the radiographic length. The teeth were embedded in alginate and root canal length up to the perforation area was measured using two different EALs (DentaPort ZX [Morita, Tokyo, Japan] and Gold Reciproc motor [VDW, Munich, Germany]) and recorded as the electronic length. RESULTS: In teeth with an artificial root perforation 0.4 mm in diameter, the measurements obtained with DentaPort ZX were more accurate than with the Gold Reciproc motor (P ˂ 0.05), and on CBCT images, more accurate measurements were obtained with a voxel size of 0.125 mm compared to 0.25 mm (P ˂ 0.05). In teeth with an artificial root perforation 1.0 mm in diameter, the radiographic length was closer to actual length than the electronic length (P ˂ 0.05). CONCLUSION: In artificial root perforations with a diameter of 0.4 mm, CBCT gives more reliable results than EALs. Both EAL and CBCT measurements were closer to actual length in artificial perforations that were 1.0 mm in diameter.


Assuntos
Tomografia Computadorizada de Feixe Cônico Espiral , Ápice Dentário , Cavidade Pulpar/diagnóstico por imagem , Eletrônica , Alemanha , Humanos , Odontometria , Preparo de Canal Radicular , Ápice Dentário/diagnóstico por imagem
5.
Rev. Odontol. Araçatuba (Impr.) ; 42(1): 9-13, jan.-abr. 2021. tab
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-1148159

RESUMO

O objetivo do presente estudo foi mensurar o pH externo radicular de dentes bovinos que foram desinfetados em solução de cloramina por 7 dias. Neste estudo foram utilizadas soluções irrigadoras, hipoclorito de sódio 1%, clorexidina 0,12% e hipoclorito de sódio 2,5% associadas ao edta e as medicações intracanais, hidróxido de cálcio, hidróxido de cálcio com PMCC e clorexidina gel 2%. O preparo químico mecânico foi realizado com as limas easy logic e as soluções foram agitadas com ultrassom durante 3 minutos e após os dentes foram imersos em água deionizada em eppendorfs estéreis e mantidos em estufa a 37°C. O pH externo foi analisado utilizando as fitas medidoras de pH no período de 24 horas, 48 horas, 7 dias, 10 dias e 15 dias. A normalidade dos valores obtidos de cada ensaio foi testada através do teste Kolmogorof- Smirnov, e o teste estatístico foi ANOVA de uma via e comparações múltiplas de Tukey. Os resultados mostraram que houve diferença estatística nos valores de pH nos grupos avaliados dentro dos tempos (p< 0,05). Concluiu-se que mesmo com as variações de pH nos períodos avaliados, as medicações e as soluções irrigantes podem ser utilizadas de forma associadas na endodontia, com o intuito de eliminar o maior número de microrganismos dos canais radiculares(AU)


The objective of the present study was to measure the external root pH of bovine teeth that were disinfected in chloramine solution for 7 days. Irrigating solutions, 1% sodium hypochlorite, 0.12% chlorhexidine and 2.5% sodium hypochlorite associated with edta and intracanal medications, calcium hydroxide, calcium hydroxide with PMCC and chlorhexidine gel 2%. The mechanical chemical preparation was performed with the easy logic files and the solutions were shaken with ultrasound for 3 minutes and after the teeth were immersed in deionized water in eppendorfs and kept in an oven at 37 ° C. The external pH was analyzed using the pH measuring tapes in the period of 24 hours, 48 hours, 7 days, 10 days and 15 days. The normal values obtained from each test were tested using the Kolmogorof-Smirnov test, and the statistical test was one-way ANOVA and Tukey's multiple comparisons. The results showed that there was a statistical difference in pH values in the groups evaluated within the times (p< 0.05). It was concluded that even with pH variations in the evaluated periods, medications and irrigating solutions can be used in an associated way in endodontics, in order to eliminate the largest number of microorganisms in the root canals(AU)


Assuntos
Irrigantes do Canal Radicular , Preparo de Canal Radicular , Hipoclorito de Sódio , Hidróxido de Cálcio , Cloraminas , Clorexidina , Análise de Variância , Ácido Edético , Endodontia
6.
J Adhes Dent ; 23(2): 167-175, 2021 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-33825430

RESUMO

PURPOSE: To investigate the effects of root canal irrigants, dentin surface treatment, and timing of the restoration on the microtensile bond strength (µTBS) of a universal adhesive to deep coronal dentin. MATERIALS AND METHODS: Ninety (90) intact molars were grouped according to the irrigation protocol: group 0 (saline, control group); group 1: 5.25% sodium hypochlorite (NaOCl), 17% ethylenediaminetetraacetic acid (EDTA) followed by 5.25% NaOCl; group 2: 18% etidronic acid (HEDP) + 5.25% NaOCl in a single mixture. Groups 1 and 2 were divided into 2 subgroups (n = = 10) according to the time of restoration: immediate (subgroup A) and after 7 days (subgroup B). Four other groups (n = 10) were created according to the dentin surface pretreatment and received an immediate restoration: group 3: 5.25% NaOCl - 17% EDTA and AH Plus Cleaner; group 4: 5.25% NaOCl - 17% EDTA and 100% ethanol; group 5: 5.25% NaOCl + 18% HEDP and AH Plus Cleaner; group 6: 5.25% NaOCl + 18% HEDP and 100% ethanol. µTBS testing was carried out for each subgroup and interfaces were analyzed through SEM. The µTBS was analyzed with Welch statistics and the post-hoc Games-Howell test for multiple comparisons (p < 0.05). RESULTS: Statistically significant differences were observed between test groups and control groups (p < 0.001), except for group 3 (p = 0.349). No significant differences were recorded between groups 1A (27.5 ± 8.7 MPa), 2A (32.6 ± 14.5 MPa) and 3 (27.3 ± 14.3 MPa). Group 6 (48.6 ± 11.6 MPa) exhibited the highest µTBS among all tested groups. For groups 1 and 2, significantly higher values were recorded for subgroups 1B (39.3 ± 7.6 MPa) and 2B (43.8 ± 8.3 MPa) compared to subgroups 1A (27.5 ± 8.7 MPa) and 2A (32.6 ± 14.5 MPa). CONCLUSION: When using NaOCl as root canal irrigant, it is advisable to delay the placement of a post-endodontic-treatment restoration.


Assuntos
Colagem Dentária , Cimentos Dentários , Cavidade Pulpar , Análise do Estresse Dentário , Dentina , Ácido Edético , Teste de Materiais , Irrigantes do Canal Radicular , Preparo de Canal Radicular , Hipoclorito de Sódio
7.
Braz Dent J ; 32(1): 104-110, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33913996

RESUMO

These case reports aimed to describe the management of lateral perforation in the middle cervical third of the root in two maxillary incisors with pulp canal calcification using Bio-C Repair, with safe and viable clinical treatment strategies. Digital radiographic exams were obtained with different angles and analyzed using different filters. Cone-beam computed tomography (CBCT) images were requested to show the actual position of the canal, location of the perforation, and guide the strategic planning of the case. Subsequently, cavity access was prepared with the aid of dental operating microscopy. After perforation was identified, granulation tissue was removed and the original canal was identified and then dressed with calcium hydroxide. In the second visit, the perforation was filled with Bio-C Repair and the canal system filled with gutta-percha points and a root canal sealer (Bio-C Sealer). The teeth were restored with glass fiber post, 4 mm beyond the perforation level, and provisory crowns. Both teeth treated as described above were functional and asymptomatic with a 1-year clinical and radiographic assessment. The Bio-C Repair is suggested as a new cement option for the management of lateral canal perforations, with effective results as observed after a one-year follow-up.


Assuntos
Materiais Restauradores do Canal Radicular , Preparo de Canal Radicular , Hidróxido de Cálcio , Cavidade Pulpar , Guta-Percha , Humanos , Obturação do Canal Radicular
8.
Eur J Paediatr Dent ; 22(1): 10-14, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33719476

RESUMO

AIM: In vitro evaluation of cleanliness of root canal walls of primary molars after preparation with the Self-Adjusting-File and Mtwo-instruments and final irrigation with citric acid and sodium hypochlorite. MATERIALS AND METHODS: s Study Design: In 23 matched pairs, teeth were prepared either with SAF or with Mtwo NiTi-instruments, and final irrigation was performed with 2 mL citric acid and 4 mL NaOCl. Roots were split longitudinally, SEM-images were taken, and smear layer was evaluated by two blinded observers using a four-grade score. Statistical evaluation was performed with Mann-Whitney-U-Test and Wilcoxon Signed Rank Test (P<0.05). RESULTS: No significant difference between SAF and Mtwo (P=0.9454) was observed. Overall removal of the smear layer was significantly better in the coronal part of the root canal than in the apical one (P=0.0004393). Mtwo showed no significant difference in cleanliness when comparing the coronal and apical part of the root canal (P=0.1089), whereas SAF cleaned the coronal part of the root canal significantly better than the apical part (P=0.00108). CONCLUSION: None of the two instruments was superior concerning cleanliness in root canals of primary molars. Both show good cleaning ability when using an irrigation protocol with citric acid and sodium hypochlorite.


Assuntos
Cavidade Pulpar , Camada de Esfregaço , Humanos , Microscopia Eletrônica de Varredura , Dente Molar/cirurgia , Irrigantes do Canal Radicular , Preparo de Canal Radicular , Hipoclorito de Sódio
9.
Niger J Clin Pract ; 24(3): 418-424, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33723118

RESUMO

Objectives: The aim of this study was to compare the formation of dentinal crack after root canal preparation performed with different heat treated single-file systems. Materials and Methods: Forty mandibular premolar teeth were randomly divided into four groups according to the file system to be used during the preparation (n = 10): Group 1: Reciproc Blue; group 2: One Curve; group 3: HyFlex EDM; group 4: (control group) hand files. During the cleaning and shaping, irrigation was performed with a total of 10 ml of 5.25% sodium hypochlorite and 2 mL of distilled water. Then sections were taken from the roots (3, 6 and 9 mm). Sections were examined on a stereomicroscope to determine the presence of cracks. Chi-square test was used for data analysis. Results: There was a significant difference between the groups in dentinal crack frequency (P <.05). HyFlex EDM (13.3%) caused less dentinal crack than One Curve (26.7%) and Reciproc Blue (30%). No cracks were observed in the control group. When 3, 6, and 9 mm were evaluated within themselves, dentinal crack formation did not differ according to the groups (P > 0.05). A statistically higher mean value was obtained in the control group compared to the other groups in terms of working time (P < 0.001). Conclusions: All the files used during root canal preparation formed dentin crack. Hy-Flex EDM caused less dentinal cracks than other file systems. The flexibility of nickel-titanium instruments because of heat treatment seems to have a significant influence on dentinal crack formation.


Assuntos
Dentina , Temperatura Alta , Mãos , Humanos , Preparo de Canal Radicular , Hipoclorito de Sódio
10.
BMC Oral Health ; 21(1): 150, 2021 03 23.
Artigo em Inglês | MEDLINE | ID: mdl-33757499

RESUMO

BACKGROUND: This randomized clinical trial aimed to compare the preparation time and severity of postoperative pain between HyFlex Electric Discharge Machine (EDM) glide path file (GPF) and PathFile. METHODS: Eighty patients whose molar teeth had at least one severely curved canal were treated by the same specialist. After access cavity preparation, the patients were randomly assigned to receive glide path enlargement with either HyFlex EDM GPF or PathFile. ProTaper Next X1 and X2 files were used to prepare the canals. The time of preparation was assessed and the severity of postoperative pain over the next 7 days was recorded. The preparation time and the postoperative pain scores were compared using the Linear Mixed Models (P ≤ 0.05). RESULTS: Glide path enlargement time was significantly shorter with HyFlex EDM GPF (27.828 ± 2.345 s) than with PathFile (48.942 ± 2.864 s) (P < 0.001). The highest postoperative pain score was recorded on the first day and the pain decreased over time in both groups. HyFlex EDM GPF group patients reported significantly less postoperative pain than PathFile group patients overall (P < 0.001). CONCLUSIONS: Postoperative pain and glide path preparation time could be reduced by using HyFlex EDM GPF system. Trial registration PKUSSNCT, PKUSSNCT-17B12, Registered 24 October 2017.


Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Desenho de Equipamento , Humanos , Dente Molar/cirurgia , Dor Pós-Operatória , Titânio
11.
BMC Oral Health ; 21(1): 90, 2021 03 02.
Artigo em Inglês | MEDLINE | ID: mdl-33653318

RESUMO

BACKGROUND: Radiographic analysis of tooth morphology is mandatory for accurate calibration of the degree of canal curvature angle and radiographic working length to its real dimensions in case difficulty assessment protocols. This study aimed to determine the impact of the degree of root canal curvature angle on maintaining the real working length and the original canal axis of prepared root canals using a reciprocating rotary instrumentation technique. METHODS: Radiographic image analysis was performed on 60 extracted single-rooted human premolar teeth with a moderate canal curvature (10°-25°) and severe canal curvature (26°-70°). Working length and longitudinal canal axis were determined using cone-beam computed tomography (CBCT) and digital periapical radiography. The real canal length was determined by subtracting 0.5 mm from the actual canal length. Root canals were prepared using the WaveOne Gold reciprocating file (Dentsply Maillefer, Ballaigues, Switzerland). RESULTS: There was no significant relation of the degree of canal curvature angle to the accuracy of radiographic working length estimated on CBCT and digital periapical radiographic techniques (P > 0.05). Postinstrumentation changes in the original canal axis between moderate and severe canal curvature angles, assessed on CBCT and periapical digital radiographic images were statistically non-significant (P > 0.05). CONCLUSIONS: A standardized digital periapical radiographic method performed similarly to the CBCT technique near to its true working length. No significant interaction exists between the diagnostic working length estimation, postoperative root canal axis modification, and the degree of canal curvature angle, using reciprocating rotary instrumentation technique.


Assuntos
Cavidade Pulpar , Ápice Dentário , Tomografia Computadorizada de Feixe Cônico , Cavidade Pulpar/diagnóstico por imagem , Cavidade Pulpar/cirurgia , Humanos , Dente Molar , Prognóstico , Preparo de Canal Radicular , Suíça , Ápice Dentário/diagnóstico por imagem , Ápice Dentário/cirurgia
12.
Eur J Oral Sci ; 129(2): e12769, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33667031

RESUMO

This study evaluated the effects of 9% etidronic acid (HEBP) and 17% ethylenediaminetetraacetic acid (EDTA) used either with conventional syringe irrigation (CSI) or passive ultrasonic irrigation (PUI) on the fracture resistance of roots with different dentine thickness. The root canals of 120 extracted teeth were widened, leaving dentinal walls with different thicknesses of either 0.75 mm, 1.50 mm, or 2.25 mm with 40 teeth in each group. Within each of these groups, four subgroups (n = 10) were formed according to the final irrigation regimens applied: 2.5% NaOCl-17% EDTA with CSI; 2.5% NaOCl-17% EDTA with PUI; 2.5% NaOCl + 9% HEBP with CSI; 2.5% NaOCl + 9% HEBP with PUI. The irrigated root canals were obturated with AH Plus sealer and gutta-percha cones. A compressive vertical loading was applied to the samples and the force at fracture was recorded. Data were statistically analysed using a multiple linear regression analysis. The most influencing factor for the fracture strength of roots was the remaining dentine thickness, followed by the irrigation method, and then the irrigation solution. The samples irrigated using PUI were statistically significantly more resistant to fracture than those using CSI (mean difference = 116.3 N; 95% CI = [53.9, 178.6] N). The application of HEBP was associated with higher resistance to fracture than the application of EDTA (mean difference = 71.0 N; 95% CI = [8.6, 133.3] N).


Assuntos
Irrigantes do Canal Radicular , Hipoclorito de Sódio , Cavidade Pulpar , Dentina , Ácido Edético , Preparo de Canal Radicular , Irrigação Terapêutica
13.
Dent Mater ; 37(5): 796-804, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33653597

RESUMO

OBJECTIVE: To develop a new method to test the fracture strength of endodontically-treated root dentin. METHOD: Bovine tooth roots were transversely cut into 2-mm thick sections and the root canals were enlarged with a taper of 0.06. An outer layer of resin composite was bonded to each section to make the root canal-to-outer radius ratio smaller than 1/3. The resulting discs were treated with irrigants at the inner surface and then fractured by inserting through the center a steel rod of the same taper attached to a universal test system. Fracture strength was calculated by using Lame's equations for thick-walled cylinders. Micro-indentation was performed to evaluate the depth of dentin affected by irrigation. Finite element analysis (FEA) was performed to verify the reasonableness of using resin composite to surround the dentin section as well as the analytical solution. RESULTS: The fracture strength of endodontically-treated root dentin based on the analytical solution for a homogeneous section was 139.69 ± 32.59 MPa. However, FEA that took into account root canal softening caused by the irrigants showed that this was overestimated by about 33.5%. The corrected fracture strength of treated dentin was 114.58 ± 26.74 MPa. By incorporating the layer of affected dentin into the analytical solution, the difference in the fracture-causing stress between the analytical and numerical solutions dropped to around 9.5%. SIGNIFICANCE: A relatively simple but clinically relevant method has been developed for measuring the fracture strength of endodontically-treated root dentin. The method could be applied to root dentin that is treated by conventional canal opening and irrigation.


Assuntos
Colagem Dentária , Dente não Vital , Animais , Bovinos , Resinas Compostas , Cavidade Pulpar , Dentina , Resistência à Flexão , Cimentos de Resina , Preparo de Canal Radicular
14.
Gen Dent ; 69(2): 64-68, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33661118

RESUMO

Taurodontism, usually associated with genetic disorders, is an anomaly in dental development in which the tooth presents with a vertically elongated pulp chamber due to an invagination failure of the Hertwig epithelial sheath. This article presents 2 case reports describing the endodontic treatment of permanent taurodontic molars in systemically healthy patients. In case 1, a maxillary left first molar presented with hypertaurodontism and 5 root canals. In case 2, a mandibular left second molar presented with hypertaurodontism and a C-shaped canal. Treatment of both teeth was based on careful radiographic evaluation with magnification, which allowed the root canal orifices to be identified and the endodontic treatment to be performed. Chemical-mechanical preparation was performed with mechanized instruments and a 2.5% sodium hypochlorite solution. As an auxiliary protocol to finish cleaning, passive ultrasonic irrigation was performed, and a thermoplastic filling technique was used. When complex internal anatomy and accessory root canals are present, endodontic treatment of a tooth presenting with hypertaurodontism can be challenging. Given the complexities of the present cases, the positive outcomes can be attributed to the use of magnification during endodontic procedures and meticulous attention to tooth preparation and obturation techniques.


Assuntos
Cavidade Pulpar , Anormalidades Dentárias , Cavidade Pulpar/diagnóstico por imagem , Humanos , Dente Molar/diagnóstico por imagem , Preparo de Canal Radicular , Tratamento do Canal Radicular , Anormalidades Dentárias/diagnóstico por imagem , Anormalidades Dentárias/terapia
15.
J Oral Sci ; 63(2): 167-169, 2021 Mar 31.
Artigo em Inglês | MEDLINE | ID: mdl-33731504

RESUMO

PURPOSE: This study evaluated the precision of electronic working length by microcomputed tomography using two electronic apex locators (EALs). METHODS: Twenty single-rooted permanent teeth without caries or restorations were selected as the subject teeth. The positions of the minor apical constriction (AC) and major apical foramen (AF) were measured by electronic root canal length, and microcomputed tomography was performed with the file inserted and fixed in the root canal. All teeth were measured individually and independently by two operators. The Mann-Whitney U-test was used to statistically test the AC and AF values using two EALs; P < 0.05 was defined as statistically significant. RESULTS: This was 65.0% within 1.5 mm in the case of two EALs on AC. This was more than 90.0% within 1.0 mm in the case of two EALs on AF. Comparison of the differences between the respective AC and AF of the measurements obtained using the two EALs revealed no significant difference. CONCLUSION: The two EALs are devices that can greatly improve the accuracy of WL control.


Assuntos
Tratamento do Canal Radicular , Ápice Dentário , Cavidade Pulpar/diagnóstico por imagem , Eletrônica , Odontometria , Preparo de Canal Radicular , Ápice Dentário/diagnóstico por imagem , Microtomografia por Raio-X
16.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 56(2): 210-215, 2021 Feb 09.
Artigo em Chinês | MEDLINE | ID: mdl-33557509

RESUMO

Root canal obturation is conducted by using filling materials to tightly seal the root canal system after the procedure of preparation in order to control infection and promote periapical healing. The quality of root canal obturation is one of the essential factors affecting the prognosis of root canal treatment. Qualified root canal filling is defined as a homogeneous radiographic apical filling within the cemento-dentine junction with neither overfilling nor underfilling. This review elucidates the long-term outcome of root canal overfilling and its causes, the influence of apical overfilling on adjacent structures and the prevention and management of overfilling, so as to help the clinicians achieving a better outcome of root canal treatment and obtaining an optimal long-term prognosis.


Assuntos
Materiais Restauradores do Canal Radicular , Prognóstico , Obturação do Canal Radicular , Preparo de Canal Radicular , Tratamento do Canal Radicular
17.
Int Endod J ; 54(6): 966-974, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33527413

RESUMO

AIM: To evaluate the correlation between the volume of dental hard tissues removed and the fracture resistance of mandibular molar teeth with ultraconservative (UltraAC) or traditional (TradAC) access cavity preparations. METHODOLOGY: Sixty recently extracted and intact mandibular first molars were scanned in a microcomputed tomographic (micro-CT) device, anatomically matched and assigned at random to 2 groups (n = 30), according to the access cavity type: UltraAC or TradAC. After access preparation, mesial and distal canals were prepared using Reciproc instruments and a new scan was taken. The volumes of pulp chamber and dental hard tissues in each specimen were measured before and after the experimental procedures, and the percentage volume reduction of hard tissues calculated for the entire tooth and for the crown separately. Teeth were then root filled, restored and subjected to fracture resistance tests in an universal testing machine. The force required to fracture was recorded in Newtons (N). The adherence of the variables to a Gaussian curve was verified using a Shapiro-Wilk test. Skewed data were analysed with nonparametric Wilcoxon signed rank or Spearman correlation tests, whilst the normally distributed data were analysed with a dependent samples Student t-test. Level of significance was set at 5%. RESULTS: Pre-operatively, no difference was observed between groups regarding the volume of pulp canal space or dental hard tissues (P > 0.05). After access preparation, volumes of the removed hard tissues from the entire tooth and from the crown were significantly greater in teeth prepared with TradAC than with UltraAC (P < 0.05). No significant difference was observed in the fracture resistance values between TradAC (902.9 ± 347.8 N) and UltraAC (948.7 ± 405.7 N) groups (P = 0.975). The Spearman test was unable to identify a correlation between fracture resistance and percentage volume of removed dental hard tissues in the entire root (P = 0.525, r = -0.084) or only in the crown (P = 0.152, r = -0.187). CONCLUSION: The volume of hard dental tissues removed, although greater in teeth with TradAC compared to UltraAC, did not correlate with the fracture resistance results, indicating that a minimally invasive access cavity did not increase the resistance of restored mandibular first molars to fracture.


Assuntos
Dente Molar , Preparo de Canal Radicular , Cavidade Pulpar , Dentina , Humanos , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Microtomografia por Raio-X
18.
J Endod ; 47(5): 812-819, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33549630

RESUMO

INTRODUCTION: This research studies and compares the shaping ability of WaveOne Gold (WG; Dentsply Tulsa Dental Specialties, Tulsa, OK), the Reciproc Blue (RB; VDW, Munich, Germany), TRUShape (TS, Dentsply Tulsa Dental Specialties), XP-endo Shaper (XP; FKG, La Chaux-de-Fonds, Switzerland), iRace (IR, FKG), and TruNatomy (TN; Dentsply Sirona, Ballaigues, Switzerland) in the preparation of moderately curved canals and using micro-computed tomographic technology. METHODS: Sixty lower molars with 2 mesial canals were randomly distributed into 6 groups of 10 molars and 20 canals per group (n = 20). Specimens were scanned before and after preparation using the SkyScan 1275 (Bruker microCT, Kontich, Belgium). Group 1 was treated with WG, group 2 with RB, group 3 with TS, group 4 with XP, group 5 with IR, and group 6 with TN. After instrumentation, researchers quantified the changes produced in the canal geometry in terms of surface, volume, structure thickness, surface convexity index, structure model index, percentage of surface touched, and centroids. Wilcoxon and analysis of variance tests were performed to compare the values before and after preparation and the differences between groups. The significance level was established at 5%. RESULTS: There were no significant differences between WG and RB (P > .05) and between TN and XP (P > .05). TN had significant differences with WG, RB, TS, and IR (P < .05). All the files produced similar apical transportation (P > .05). CONCLUSIONS: WG and RB and TN and XP had similar shaping effectivity. TS and WG touched the highest percentages of canal surfaces (81% and 73%, respectively) but produced the biggest changes in the canal anatomy. TN and XP better kept the canal anatomy, but TN touched the lowest percentage of canal surface (50%). All the files used were able to clean and to shape moderately curved canals with minimal apical transportation.


Assuntos
Níquel , Preparo de Canal Radicular , Bélgica , Cavidade Pulpar/diagnóstico por imagem , Desenho de Equipamento , Titânio , Microtomografia por Raio-X
19.
J Endod ; 47(5): 787-792, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33556423

RESUMO

INTRODUCTION: The butterfly effect is an optical phenomenon and is related to the presence of sclerotic dentin in the roots. The unique pattern of sclerotic dentin formation produces a characteristic butterfly shape in transverse sections of the roots. The objective of this study was to evaluate the direction of the fracture line in roots that exhibit the butterfly effect. METHODS: Thirty single-rooted premolars with oval-shaped roots were decoronated and embedded in acrylic blocks and subjected to vertical force under a universal testing machine (HPBSD; Tec-Sol India, Chennai, India). Fractured roots were examined under a stereomicroscope (Model no. 080772; Lawrence and Mayo, Mumbai, India) at ×10 magnification to determine the location and direction of the fracture line. To evaluate the correlation between the direction of sclerotic dentin and the direction of the fracture line, teeth were sectioned and observed under a stereomicroscope at ×20 and ×40 magnification. The correlation was analyzed using the Fisher exact test (P < .05 for the coronal and apical thirds and P > .05 for the middle third). RESULTS: Sclerotic dentin was observed more in the apical area and less in the coronal third of the root. The correlation between the direction of sclerotic dentin and the direction of the fracture line was statistically significant in the coronal and apical thirds of the root. CONCLUSIONS: The vertical root fracture that runs buccolingually is correlated to the harder sclerotic dentin present in the mesiodistal direction.


Assuntos
Fraturas dos Dentes , Raiz Dentária , Dente Pré-Molar , Dentina , Humanos , Índia , Preparo de Canal Radicular
20.
J Endod ; 47(5): 721-731, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33587997

RESUMO

INTRODUCTION: A comparison between root canal transportation studies is nearly impossible because of nonstandardized transportation evaluation methods. The aim of the present review was to search, compare, and critically discuss transportation evaluation methods. METHODS: A search of PubMed, Web of Science, Scopus, ScienceDirect, and reference lists of articles was conducted up to March 2020 using appropriate key words to identify transportation evaluation methods. The methods in the included articles were extracted, compared, and categorized. RESULTS: Seventy-four articles using original methods were selected. All studies share 3 main steps: image acquisition, image measurements, and calculation of parameters. Images were acquired by photography, radiography, and computed tomographic imaging. Two types of measurements were used: the amount of removed material and the canal center point distance. The parameters were calculated and reported as distance or ratio. Relationships between the different transportation parameters were found and confirmed with mathematical simulation. CONCLUSIONS: Although methods were proposed as being novel, similarities between them were found, enabling the classification of the methods and identifying correlations. The canal center point distance is the most suitable for the description of canal transportation because it is comprehensible and it relates to the mathematical concept of translation. Removed material-based measurements are double the value of the canal center point distance. Ratio parameters are not suitable for reporting transportation.


Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Desenho de Equipamento , Fotografação , Tratamento do Canal Radicular
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