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1.
Niger J Clin Pract ; 23(6): 811-816, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32525116

RESUMO

Background: An optimum bonding between the sealer and dentin is important for impermeable root canal filling and many procedures were applied to improve root canal dentin and in turn the bond strength between the sealer and dentine. There is lack of sufficient data on the effect of nonthermal plasma application on the bond strength of sealers to the root canal dentin. Aim: The purpose of this study was to evaluate the effect of NAP on the push-out bond strength (PBS) of a bioceramic and resin-based root canal sealer (RCS) to root canal dentin. Materials and Methods: Forty single-rooted mandibular premolars were decoronated. After preparation and final irrigation, the specimens were divided into four groups (n = 10). Group AH: Root canals were filled with gutta-percha (GP) and AH Plus RCS, Group P-AH: Root canals were filled with GP and AH Plus RCS following the NAP application, Group BC: Root canals were filled with GP and Endosequence BC RCS, and Group P-BC: Root canals were filled with GP and Endosequence BC RCS following the NAP application. Then roots were sectioned horizontally to obtain ~1 mm thick dentin disks. PBS test was performed to the second (coronal) and fourth (middle) slices. Data were analyzed with the Kruskal-Wallis and t-test. Results: There was a statistically significant difference among the groups for both coronal and middle regions (P < 0.05). P-BC group showed higher PBS than AH and P-AH groups in the coronal region. P-BC group showed higher PBS than the other groups in the middle region. Conclusions: The use of NAP did not influence the push-out bond strength of AH-Plus sealer to the root canal dentin. The Endosequence-BC sealer showed a better bond strength than the AH-Plus sealer after NAP application.


Assuntos
Cavidade Pulpar , Materiais Restauradores do Canal Radicular/química , Obturação do Canal Radicular/métodos , Cimento de Óxido de Zinco e Eugenol , Dente Pré-Molar , Colagem Dentária , Dentina , Resinas Epóxi/química , Guta-Percha/química , Humanos , Teste de Materiais , Pressão , Preparo de Canal Radicular/métodos , Temperatura
2.
Clin Oral Investig ; 24(3): 1333-1338, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31309344

RESUMO

OBJECTIVE: The aim of this study was to evaluate the fracture resistance of simulated immature roots using Biodentine (BD) and fiber post (FP) compared with different root canal-filling materials under aging conditions. MATERIALS AND METHODS: One hundred and forty maxillary central anterior teeth were randomly divided into seven groups (n = 20/group). Negative control received no treatment. In the other groups, the root canals were prepared to simulate immature teeth. The root canals were filled with a 4-mm apical plug of BD and restored intraradicular with BD, BD + FP, composite resin (CR), CR + FP, and gutta-percha (GP). Positive controls were instrumented but without restoration. Teeth were subjected to thermocycling and received cyclic loading before fracture resistance test. Fracture resistance was conducted using a universal testing machine with a crosshead speed of 0.5 mm/min until fracture. Load to fracture was recorded in newtons (N). Data were statistically analyzed using one-way analysis of variance and Tukey's test at P < 0.05. RESULTS: Root canals restored intraradicular with BD + FP and CR + FP showed the highest fracture resistance compared with the other experimental groups (P < 0.001). There was no significant difference in the fracture resistance between CR and BD groups (P = 0.998). GP and positive control groups were significantly lower resistance to fracture than the other groups (P < 0.001). CONCLUSIONS: Intraradicular reinforcement with BD + FP and CR + FP enhanced the fracture resistance of simulated immature teeth than the other experimental groups. CLINICAL RELEVANCE: Biodentine or composite resin combined with fiber post could be used to reinforce immature teeth with an apical Biodentine plug.


Assuntos
Compostos de Cálcio/química , Análise do Estresse Dentário , Teste de Materiais , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Fraturas dos Dentes/prevenção & controle , Resinas Compostas/química , Guta-Percha/química , Humanos , Técnicas In Vitro , Distribuição Aleatória , Fatores de Tempo
3.
Biomed Res Int ; 2019: 3512606, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31815132

RESUMO

Objective: The aim of the present study was to characterize a novel resin-based monoblock endodontic obturation system consisting of a polymeric cone and a resin-based endodontic sealer. Methods: The preliminary tests performed for the experimental cone were as follows: cohesive strength, dimensional stability, standardization of the diameter and taper, calcium ion release, and radiopacity, for the characterization of the experimental sealer, film thickness and flow tests were performed. Tests were performed according to the American National Standards Institute/American Dental Association (ANSI/ADA) Standards Nos. 57 and 78. The experimental cone was compared to gutta-percha, whereas the experimental sealer was compared to AH Plus. Data were analyzed by Student's t-test (α = 0.05). Results: The experimental cone had superior values for cohesive strength and dimensional stability compared to gutta-percha. Regarding calcium ion release, the experimental system continued to release calcium ions after 30 days. Film thickness was similar for both endodontic sealers; conversely, the experimental resin-based sealer achieved higher values for flow compared to AH Plus. Conclusion: The experimental resin-based monoblock obturation system fully met the requirements of the ANSI/ADA Standard No. 78 and the ANSI/ADA Standard No. 57, except for radiopacity. Considering this, further studies are still needed to evaluate other radiopacifiers and the effect of their incorporation on the physicochemical properties of this novel resin-based monoblock endodontic obturation system.


Assuntos
Resinas Epóxi/química , Teste de Materiais , Materiais Restauradores do Canal Radicular/química , Obturação do Canal Radicular , Cálcio/química , Compostos de Cálcio/química , Guta-Percha/química , Humanos , Reologia , Propriedades de Superfície , Resistência à Tração
4.
J Appl Oral Sci ; 27: e20180556, 2019 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-31508791

RESUMO

OBJECTIVE: To evaluate the effect of ultrasonic and sonic activation on physicochemical properties of AH Plus, MTA Fillapex, ADSeal, GuttaFlow Bioseal, and GuttaFlow 2 sealers. METHODOLOGY: Three experimental groups were formed: no activation (NA), ultrasonic activation (UA), and sonic activation (SA). The sealers were manipulated according to the manufacturers' instructions. A 3-mL syringe was adapted to receive 1 mL of sealer. Activation was performed with a 20/.01 ultrasonic insert (20 s/1W) in the UA group. A size 35.04 sonic tip was used (20 s/10,000 cycles/min-1) in the SA group. The molds for physicochemical analysis were filled and evaluated according to ANSI/ADA specification no. 57: setting time (ST), flow (FL), dimensional change (DC), solubility (SB), and radiopacity (RD). Statistical analysis was performed by Kruskal-Wallis, one-way ANOVA, and Tukey's tests (P<0.05). RESULTS: Regarding ST, only AH Plus and GuttaFlow 2 in the NA group met the ANSI/ADA standards. All FL values were greater than 20 mm in diameter, as determined by ANSI/ADA. The tested sealers and protocols did not comply with the ANSI/ADA standards for DC. As for SB, only MTA Fillapex, regardless of the activation protocol, did not follow the ANSI/ADA standards. All of the investigated sealers, regardless of the activation protocol, presented radiographic density higher than 3 mm Al, as proposed by ANSI/ADA. CONCLUSIONS: UA and SA promoted changes in the physicochemical properties of the evaluated root canal sealers, mainly in ST and F. Thus, it is important to evaluate the physicochemical properties of endodontic sealers associated with activation techniques prior to clinical application in order to determine whether the properties follow the parameters set by ANSI/ADA, ensuring safety and quality of root canal filling.


Assuntos
Compostos de Alumínio/química , Compostos de Cálcio/química , Dimetilpolisiloxanos/química , Resinas Epóxi/química , Guta-Percha/química , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Ondas Ultrassônicas , Análise de Variância , Combinação de Medicamentos , Teste de Materiais , Valores de Referência , Reprodutibilidade dos Testes , Solubilidade , Estatísticas não Paramétricas , Propriedades de Superfície , Fatores de Tempo
5.
J Dent ; 89: 103181, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31430509

RESUMO

OBJECTIVES: The aim of this study was to develop a new method of obturation by warm sealer in conjunction to single cone gutta-percha and evaluate the suitability of this technique to obturate complex root canal systems. METHODOLOGY: Three root canal sealers namely, AH Plus, BioRoot RCS, GuttaFlow and a prototype sealer composed of tricalcium silicate and 30% zirconium oxide mixed with water and water-soluble polymer were investigated. The sealers were tested for flow, film thickness, setting time and radiopacity following ISO 6876 (2012) recommendations at room temperature and following heat application at 100°C to change the sealer properties. All the test sealers were characterized by scanning electron microscopy and energy dispersive spectroscopy. The volume of voids when used with a single cone obturation technique both unmodified and modified by heat was evaluated using microcomputed tomography. RESULTS: Although the prototype sealer was designed to be similar to the BioRoot, its physical properties were found to be different. All sealers tested were affected by the heat and exhibited a change in the physical properties mainly the setting time, flow, film thickness and void volume. CONCLUSIONS: The application of heat affected the sealer properties and void volume. The single cone obturation technique may not be suitable for complex canal anatomy and furthermore, AH Plus should not be subjected to high temperatures as its properties deteriorate and void volume increases.


Assuntos
Guta-Percha/química , Teste de Materiais/métodos , Materiais Restauradores do Canal Radicular/química , Obturação do Canal Radicular/métodos , Compostos de Cálcio/química , Resinas Epóxi/química , Temperatura Alta , Humanos , Silicatos/química , Microtomografia por Raio-X
6.
Niger J Clin Pract ; 22(7): 926-931, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31293256

RESUMO

Background: This study was performed to evaluate the amount of apically extruded debris removed from a root canal filled with cold lateral condensation (CLC), and warm vertical compaction (WVC) techniques, using b or a phase gutta-percha with AH-Plus (Dentsply DeTrey, Konstanz, Germany) or Resilon (Resilon Research LLC, Madison, WI) with RealSeal SE (SybronEndo, Amersfoort, The Netherlands). Materials and Methods: About 100 human incisor teeth were prepared with a #25.06 NiTi rotary system and divided into five groups according to the filling material used: Group 1: CLC (gutta-percha, AH-Plus); Group 2: WVC (b phase gutta-percha, AH-Plus); Group 3: WVC (a phase gutta-percha, AH-Plus); Group 4: CLC (Resilon, RealSeal SE); and Group 5: WVC (Resilon, RealSeal SE). Extruded debris during the retreatment procedure was collected in preweighed Eppendorf tubes. The times required for retreatment were recorded. Results: The amount of debris extrusion was significantly greater with WVC than CLC in the gutta-percha and Resilon groups (P < 0.001). Using a phase gutta-percha resulted in significantly more debris extrusion than b phase gutta-percha (P < 0.001). In the WVC groups, Resilon caused significantly more debris extrusion than gutta-percha (P < 0.05). Retreatment was faster for CLC than WVC (P < 0.05). Conclusions: In the retreatment procedure, the amount of apically extruded debris and retreatment duration were dependent on the type of obturation material and technique used.


Assuntos
Cavidade Pulpar/cirurgia , Guta-Percha/química , Materiais Restauradores do Canal Radicular/química , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/métodos , Tratamento do Canal Radicular/instrumentação , Ligas Dentárias/química , Humanos , Níquel , Retratamento , Materiais Restauradores do Canal Radicular/efeitos adversos , Obturação do Canal Radicular/métodos , Titânio/química , Ápice Dentário/patologia
7.
Clin Oral Investig ; 23(1): 337-343, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29675760

RESUMO

INTRODUCTION: To compare, by Micro-CT and confocal laser scanning microscopy (CLSM), the ability of the Wave One Gold and Wave One systems to remove filling material from mesial canals of mandibular molars, effective time spent; quantity of extruded material, and percentage of sealer in the dentinal tubules after retreatment and re-obturation procedures. MATERIALS AND METHODS: Ten first mandibular molars (n = 20 mesial canals) were prepared and filled with gutta-percha and Endofill sealer mixed with Rhodamine B dye using the single cone technique. After 7 days, the canals were scanned using a high-definition micro-computer tomography with 19-mm voxel size and divided into two groups (n = 10) according to the system used in retreatment: group 1, Wave One (WO), and group 2, Wave One Gold (WG). After removing filling material with the primary file of each system, the WO 40/.08 and WG 35/.06 files were used. After using each file, a new scanning was performed and the residual filling material and extruded filling material were measured. The effective time spent to remove the canal filling was measured after each instrument. After retreatment, the teeth were re-obturated with gutta-percha and AH Plus sealer mixed with fluorescein dye using the single-cone technique. The roots were sectioned at 2, 4 and 6 mm and analysed by CLSM to measure the percentage of remaining sealer and the sealer of the new root canal filling. The data were statistically compared (P < 0.05). RESULTS: Both systems presented a similar volume of filling material remaining in the canals after the use of the two instruments, similar residual and new material in the dentinal tubules, and similar extrusion of material (P > 0.05). When using WO 25, the operator spent significantly less effective time than when using WG 25 (P < 0.05); however, use of WG 35 and WO 40 required a similar time to remove filling material from the canals (P > 0.05). CONCLUSIONS: Neither of the two systems removed all the filling material. The WG system presented similar ability in removing filling and extruded material in comparison with WO system. The effective time spent was shorter for WO 25 than for WG 25. CLINICAL RELEVANCE: Wave One Gold can be an alternative to perform retreatment considering that in comparison with Wave One, there was no difference in filling material removal capacity and extruded materials. There was only difference in the effective time spent, in which the operator spent more time with WG 25 than with WO 25.


Assuntos
Microscopia Confocal , Dente Molar/diagnóstico por imagem , Dente Molar/cirurgia , Obturação do Canal Radicular/métodos , Microtomografia por Raio-X , Instrumentos Odontológicos , Guta-Percha/química , Humanos , Técnicas In Vitro , Mandíbula , Retratamento , Materiais Restauradores do Canal Radicular/química
8.
J Int Med Res ; 47(1): 470-480, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30514145

RESUMO

OBJECTIVE: The purpose of this study was to evaluate the effect of immediate and delayed post space preparation on the sealing ability of two root canal obturation techniques by using micro-computed tomography imaging and a push-out test. METHODS: The root canals of 40 human maxillary premolar teeth were instrumented and divided into four groups: (A) single cone (SC) followed by immediate post space preparation, (B) continuous wave of condensation (CWC) followed by immediate post space preparation, (C) SC followed by delayed post space preparation, and (D) CWC followed by delayed post space preparation. Micro-CT scans were performed for volumetric analysis of voids and filling materials in the apical 4-mm portion. A push-out test was performed, and failure modes (adhesive, cohesive, or mixed) were assessed. Data were analyzed using the Kruskal-Wallis test and one-way analysis of variance. RESULTS: No significant differences were observed among the four groups in terms of the percentage volume of voids of the apical 4 mm or the bond strength of apical gutta-percha. CONCLUSIONS: The percentage volume of voids and bond strength of apical gutta-percha were similar and were not significantly influenced by the timing of post space preparation or the obturation technique.


Assuntos
Dente Pré-Molar/cirurgia , Cavidade Pulpar/cirurgia , Guta-Percha/química , Obturação do Canal Radicular/métodos , Análise de Variância , Dente Pré-Molar/patologia , Cavidade Pulpar/diagnóstico por imagem , Cavidade Pulpar/patologia , Análise de Falha de Equipamento/métodos , Humanos , Maxila/diagnóstico por imagem , Maxila/cirurgia , Obturação do Canal Radicular/instrumentação , Fatores de Tempo , Extração Dentária , Microtomografia por Raio-X
9.
Int Endod J ; 52(2): 250-257, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30091141

RESUMO

AIM: To compare the efficiency of M-Wire Reciproc and Reciproc Blue instruments in the removal of root filling material and in their ability to regain apical patency through micro-computed tomographic (micro-CT) analysis. METHODOLOGY: Ten anatomically matched pairs of teeth, with a single oval-shaped straight canal, were selected and scanned in a micro-CT device. The root canals were prepared with M-Wire Reciproc R25 instruments and filled with gutta-percha and AH Plus sealer. The root canals were then randomly allocated into two groups (n = 10), according to the instrument used: M-Wire Reciproc and Reciproc Blue. The canals were retreated up to instrument sizes 25 and then 40 in both groups. The surface area and volume of residual filling material were assessed using micro-CT imaging after the retreatment procedures. The time required to remove the root fillings was recorded. Data were analysed statistically using t-test with a significance level of 5%. RESULTS: No significant difference (P > 0.05) was observed between the instruments in terms of the volume of residual root filling material. Apical enlargement from size 25 to 40 significantly improved the removal of filling materials (P < 0.05). It was possible to regain apical patency in all specimens from both M-Wire Reciproc and Reciproc Blue groups. No difference was observed in the time required to perform the retreatment between the instruments. CONCLUSIONS: Both M-Wire Reciproc and Reciproc Blue instruments were effective in removing filling materials from oval-shaped straight canals. Apical patency was reestablished in all specimens.


Assuntos
Instrumentos Odontológicos , Materiais Restauradores do Canal Radicular/química , Obturação do Canal Radicular/instrumentação , Obturação do Canal Radicular/métodos , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/métodos , Anatomia Transversal , Ligas Dentárias/química , Cavidade Pulpar/diagnóstico por imagem , Desenho de Equipamento , Guta-Percha/química , Humanos , Incisivo/anatomia & histologia , Incisivo/diagnóstico por imagem , Incisivo/cirurgia , Mandíbula , Teste de Materiais , Níquel/química , Retratamento , Irrigantes do Canal Radicular , Hipoclorito de Sódio/química , Propriedades de Superfície , Titânio , Ápice Dentário/anatomia & histologia , Microtomografia por Raio-X/métodos
10.
J. appl. oral sci ; 27: e20180556, 2019. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1019971

RESUMO

Abstract Objective: To evaluate the effect of ultrasonic and sonic activation on physicochemical properties of AH Plus, MTA Fillapex, ADSeal, GuttaFlow Bioseal, and GuttaFlow 2 sealers. Methodology: Three experimental groups were formed: no activation (NA), ultrasonic activation (UA), and sonic activation (SA). The sealers were manipulated according to the manufacturers' instructions. A 3-mL syringe was adapted to receive 1 mL of sealer. Activation was performed with a 20/.01 ultrasonic insert (20 s/1W) in the UA group. A size 35.04 sonic tip was used (20 s/10,000 cycles/min-1) in the SA group. The molds for physicochemical analysis were filled and evaluated according to ANSI/ADA specification no. 57: setting time (ST), flow (FL), dimensional change (DC), solubility (SB), and radiopacity (RD). Statistical analysis was performed by Kruskal-Wallis, one-way ANOVA, and Tukey's tests (P<0.05). Results: Regarding ST, only AH Plus and GuttaFlow 2 in the NA group met the ANSI/ADA standards. All FL values were greater than 20 mm in diameter, as determined by ANSI/ADA. The tested sealers and protocols did not comply with the ANSI/ADA standards for DC. As for SB, only MTA Fillapex, regardless of the activation protocol, did not follow the ANSI/ADA standards. All of the investigated sealers, regardless of the activation protocol, presented radiographic density higher than 3 mm Al, as proposed by ANSI/ADA. Conclusions: UA and SA promoted changes in the physicochemical properties of the evaluated root canal sealers, mainly in ST and F. Thus, it is important to evaluate the physicochemical properties of endodontic sealers associated with activation techniques prior to clinical application in order to determine whether the properties follow the parameters set by ANSI/ADA, ensuring safety and quality of root canal filling.


Assuntos
Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Compostos de Cálcio/química , Compostos de Alumínio/química , Dimetilpolisiloxanos/química , Resinas Epóxi/química , Ondas Ultrassônicas , Guta-Percha/química , Valores de Referência , Solubilidade , Propriedades de Superfície , Fatores de Tempo , Teste de Materiais , Reprodutibilidade dos Testes , Análise de Variância , Estatísticas não Paramétricas , Combinação de Medicamentos
11.
Molecules ; 23(8)2018 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-30061494

RESUMO

Eucommia ulmoides Oliv. is widely regarded in China as a precious medicinal and commercial endemic tree. Due to cross-breeding or natural variation of E. ulmoides, the metabolite composition may vary significantly, making control of the medical quality difficult. In order to improve the rational development and utilization, the quality of seven varieties of E. ulmoides were evaluated based on metabolite profiles (total phenolic, total flavonoid, gutta-percha, aucubin, geniposidic acid, chlorogenic acid, geniposide, pinoresinol diglucoside, rutin, hyperoside, and astragalin), bioactivities (in vitro, in vivo antioxidant activities, and antibacterial activities) and HPLC fingerprint combined with chemometrics analysis. On this basis, the differences of medicinal parts (leaf and bark) were further carried out. For the traditional use of bark, Purple-leaf E. ulmoides was the most suitable. For the use of leaf, Qinzhong 1 and Purple-leaf E. ulmoides were appropriate. HPLC fingerprint analysis showed that significant differences in metabolite profiles exist among seven varieties of E. ulmoides. Combined with chemometrics analysis, seven varieties of E. ulmoides were divided into three groups from the use of leaf and bark. The analysis not only evaluated quality of seven varieties of E. ulmoides, but also could distinguish different varieties and different regions of origin. The results can provide theoretical basis for E. ulmoides resources utilization and cultivation of fine varieties.


Assuntos
Antibacterianos/isolamento & purificação , Antioxidantes/isolamento & purificação , Eucommiaceae/química , Metaboloma , Casca de Planta/química , Folhas de Planta/química , Antibacterianos/química , Antibacterianos/farmacologia , Antioxidantes/química , Antioxidantes/farmacologia , Bactérias/efeitos dos fármacos , Bactérias/crescimento & desenvolvimento , China , Ácido Clorogênico/química , Ácido Clorogênico/isolamento & purificação , Cromatografia Líquida de Alta Pressão , Eucommiaceae/classificação , Eucommiaceae/metabolismo , Flavonoides/química , Flavonoides/isolamento & purificação , Fungos/efeitos dos fármacos , Fungos/crescimento & desenvolvimento , Guta-Percha/química , Guta-Percha/isolamento & purificação , Glucosídeos Iridoides/química , Glucosídeos Iridoides/isolamento & purificação , Iridoides/química , Iridoides/isolamento & purificação , Quempferóis/química , Quempferóis/isolamento & purificação , Lignanas/química , Lignanas/isolamento & purificação , Fenóis/química , Fenóis/isolamento & purificação , Casca de Planta/metabolismo , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Folhas de Planta/metabolismo , Plantas Medicinais , Quercetina/análogos & derivados , Quercetina/química , Quercetina/isolamento & purificação , Rutina/química , Rutina/isolamento & purificação
12.
Dent Mater J ; 37(6): 988-994, 2018 Nov 30.
Artigo em Inglês | MEDLINE | ID: mdl-30158347

RESUMO

Aim of the study was to evaluate apatite forming ability and ion dissolution of bioactive glass-ceramic (BGC) particles from novel polydimethylsiloxane (PDMS) based endodontic sealer Guttaflow Bioseal. Firstly, water sorption and solubility were determined for Guttaflow 2 and Guttaflow Bioseal (GB), the latter containing BGC filler particles. Mineral precipitations in simulated body fluid (SBF) were observed with SEM/EDX. Ion-release from the sealer was determined with inductively coupled plasma optical emission spectrometry (ICP-OES) in Tris-buffer solution. Change in pH was also measured. The obtained data was statistically analyzed with Tukey's HSD test (p<0.05). GB exhibited significantly higher water sorption and solubility in comparison with Guttaflow 2. Surface structure exposed particles of BGC in the PDMS matrix. The BGC particles (size of 20-40 µm) indicated to consist of CaO-SiO2-Na2O-ZrO2-P2O5. Morphologically spherical Ca/P precipitation formed after 3 days in the SBF on the sealer surface. Ca/P ratio of the precipitation ranged in 1.20-1.65 indicating transformation to hydroxyapatite (HA). The pH of the immersion solution rose gradually.


Assuntos
Cerâmica/química , Dimetilpolisiloxanos/química , Guta-Percha/química , Materiais Restauradores do Canal Radicular/química , Adsorção , Materiais Biocompatíveis , Líquidos Corporais , Combinação de Medicamentos , Concentração de Íons de Hidrogênio , Microscopia Eletrônica de Varredura , Solubilidade , Propriedades de Superfície
13.
Head Face Med ; 14(1): 13, 2018 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-30126425

RESUMO

BACKGROUND: The aim was to compare the dislodgement resistance of calcium silicate-based sealers (Total Fill BC Sealer, Endo CPM Sealer, BioRoot RCS) with an epoxy resin-based sealer (AH Plus). METHODS: The root canals of 80 single-rooted human teeth were instrumented with F360 up to size 45.04. All canals were obturated using matching gutta-percha cones according to the single-cone technique in combination with one of the mentioned sealers (n = 20 per group). After eight weeks of incubation (37 °C, 100% humidity), the roots were embedded in resin. Starting with a distance of 7 mm from the apex, four slices of 1 mm thickness were cut. Dislodgement resistance was measured using a universal testing machine and the push-out bond strength was calculated. Specimens were examined under 4×-magnification to determine the mode of bond failure. Statistical analysis was performed using ANOVA and Student-Newman-Keuls-test. RESULTS: Regarding the pooled data of all sections, the push-out bond strength of AH Plus was significantly higher than the push-out bond strength of all calcium silicate-containing sealers (P < 0.05). Out of all calcium silicate-based sealers, Total Fill BC Sealer showed the highest push-out bond strength (P < 0.05). BioRoot RCS had significant higher push-out bond strength than Endo CPM Sealer (P < 0.05). Nearly the same results were found for all four sections. BioRoot RCS only differed significantly from Endo CPM Sealer in the third section (P < 0.05). CONCLUSIONS: The push-out bond strength of the investigated calcium silicate-based sealers was lower than of AH Plus. Total Fill BC showed the highest push-out bond strength of the calcium silicate-based sealers.


Assuntos
Colagem Dentária/métodos , Análise do Estresse Dentário/métodos , Teste de Materiais/métodos , Materiais Restauradores do Canal Radicular/química , Dente Pré-Molar , Compostos de Cálcio/química , Resinas Epóxi/química , Feminino , Guta-Percha/química , Humanos , Masculino , Sensibilidade e Especificidade , Silicatos/química , Estresse Mecânico
14.
Niger J Clin Pract ; 21(4): 496-501, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29607864

RESUMO

Background: The aim of this study was to compare the retreatment time and the removal efficiency of different root canal sealers using WaveOne Gold reciproc file system by measuring required time. Materials and Methods: Forty-five mandibular premolars were prepared and randomly divided into three groups (n = 15). In Groups 1-3, the canals were filled with gutta-percha and mineral trioxide aggregate (MTA) Fillapex, EndoREZ, and AH26, respectively. After 7 days, root canal filling materials (RCFM) were removed with WaveOne Gold reciproc files by measuring time. Teeth were grooved and sectioned longitudinally, then remaining RCFM was evaluated using digital camera. The images were transferred to image analysis software to measure the areas of remaining RCFM. Data were analyzed using one-way analysis of variance and Tukey's test (α = 0.05). Results: There was a statistically significant difference between groups according to time required for removing RCFM (P < 0.05). The time required for removing RCFM was significantly shorter in Group 1 and longer in Group 3 than the other groups (P < 0.05). In Group 1, the remaining RCFM was more than other groups at middle third (P < 0.05), but there was no statistically significant difference between groups at coronal and apical thirds (P > 0.05). Conclusions: None of the sealers evaluated in this study could completely be removed from the root canals. MTA-based sealer was removed faster than resin-based sealers.


Assuntos
Cimentos Dentários , Cavidade Pulpar/diagnóstico por imagem , Guta-Percha/química , Óxidos/química , Retratamento , Materiais Restauradores do Canal Radicular/química , Obturação do Canal Radicular/métodos , Preparo de Canal Radicular/métodos , Compostos de Alumínio , Compostos de Cálcio , Combinação de Medicamentos , Humanos , Teste de Materiais , Silicatos , Propriedades de Superfície , Fatores de Tempo , Cimento de Óxido de Zinco e Eugenol
15.
Quintessence Int ; 49(7): 535-542, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29662971

RESUMO

Many endodontically treated teeth require a post to improve the retention of the coronal restoration, which necessitates removal of the coronal part of the gutta-percha from the canal by thermal method, among other techniques. However, this technique carries the risk of heat conduction to the attachment unit of the periodontium and infliction of permanent damage especially in cases where the remaining root's dentin walls are thin. The overall objective of this article is to report on the clinical manifestations, histologic description, and periodontal management of three cases of heat-induced damage following thermal removal of gutta-percha.


Assuntos
Guta-Percha/química , Temperatura Alta , Osteonecrose/etiologia , Osteonecrose/terapia , Retratamento/métodos , Materiais Restauradores do Canal Radicular/química , Dente não Vital/terapia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Técnica para Retentor Intrarradicular , Propriedades de Superfície
16.
Braz Oral Res ; 32: e18, 2018 Mar 08.
Artigo em Inglês | MEDLINE | ID: mdl-29538480

RESUMO

The aim of this study was to evaluate the bond strength of different triccalcium silicate cements to retrograde cavity using a push out test. Thirty maxillary central incisors were shaped using #80 hand files and sectioned transversally. Root slices were obtained from the apical 4 mm after eliminating the apical extremity. The specimens were embedded in acrylic resin and positioned at 45° to the horizontal plane for preparation of root-end cavities with a diamond ultrasonic retrotip. The samples were divided into three groups according to the root-end filling material (n = 10): MTA Angelus, ProRoot MTA and Biodentine. A gutta-percha cone (#80) was tugged-back at the limit between the canal and the root-end cavity. The root-end cavity was filled and the gutta-percha cone was removed after complete setting of the materials. The specimens were placed in an Instron machine with the root-end filling turned downwards. The push-out shaft was inserted in the space previously occupied by the gutta-percha cone and push out testing was performed at a crosshead speed of 1.0 mm/min. There was no statistically significant difference in resistance to push out by the materials tested (p > 0.01). MTA Angelus and ProRoot MTA showed predominantly mixed failure while Biodentine exhibited mixed and cohesive failures. The tricalcium silicate-based root-end filling materials showed similar bond strength retrograde cavity.


Assuntos
Bismuto/química , Compostos de Cálcio/química , Colagem Dentária/métodos , Cavidade Pulpar/efeitos dos fármacos , Dentina/efeitos dos fármacos , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Análise de Variância , Falha de Restauração Dentária , Guta-Percha/química , Humanos , Teste de Materiais , Reprodutibilidade dos Testes , Propriedades de Superfície/efeitos dos fármacos , Raiz Dentária/efeitos dos fármacos
17.
Clin Oral Investig ; 22(6): 2353-2361, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29344806

RESUMO

OBJECTIVES: To compare the accuracy of confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) during the analysis of the adhesive interface integrity and intratubular penetration of root canal sealers to radicular dentine. MATERIALS AND METHODS: Twenty roots of human maxillary incisors were prepared and distributed into two groups (n = 10), followed by filling with gutta-percha and Endofill (G1) or AH Plus (G2). After 7 days, roots were sectioned and analyzed under CLSM and SEM. Score systems were used to evaluate the adhesive interface integrity (0-4) and sealer intratubular penetration (0-3). Data were submitted to Wilcoxon-Mann-Whitney and Kendall correlation statistical tests (α = 5%). RESULTS: In the adhesive interface analysis, CLSM was similar (P = 0.157) to SEM for Endofill; however, the results were different for AH Plus (P = 0.029). Intratubular penetration had significant difference between observational methods for both sealers (P < 0.0001). Correlation analysis between SEM and CLSM for adhesive interface was moderate for Endofill and low for AH Plus. Intratubular penetration was low for both sealers. CONCLUSION: SEM and CLSM analysis had similar results when sealers were compared, with a more homogeneous adhesive interface, and greater intratubular penetration for AH Plus. Comparison between observational methods demonstrated low positive correlation for adhesive interface and intratubular penetration analysis. CLINICAL RELEVANCE: A proper interface formed between sealer and dentine is very important for final quality of root canal filling. Observational methods which allow an accurate analysis of this interface must be selected to assess such features.


Assuntos
Resinas Epóxi/química , Guta-Percha/química , Incisivo/ultraestrutura , Microscopia Confocal , Microscopia Eletrônica de Varredura , Materiais Restauradores do Canal Radicular/química , Adesividade , Humanos , Técnicas In Vitro , Teste de Materiais , Propriedades de Superfície
18.
Clin Oral Investig ; 22(4): 1631-1639, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29080076

RESUMO

OBJECTIVES: The aim of the present study was to evaluate the adaptation of a calcium silicate bioceramic (BC) sealer with either BC or conventional gutta-percha compared with that of AH Plus sealer in different root canal sections. MATERIALS AND METHODS: Seventy-two extracted mandibular premolars were divided randomly into six groups. After standardised chemomechanical preparation, four groups were obturated with the BC sealer and BC gutta-percha or conventional gutta-percha, and the other two groups were obturated with AH Plus sealer and conventional gutta-percha either in lateral compaction or in a single cone technique. Each root was sectioned into three sections. An impression was made from each section, and replicas were then made for scanning electron microscopy (SEM) analysis. Areas and interfacial gaps were identified using image analysis software. In addition to descriptive and explorative data analyses, linear regression analysis was performed. RESULTS: All specimens had measurable interfacial gaps. Significantly fewer gaps were found between conventional gutta-percha and sealer compared to those observed when using the BC gutta-percha (p < 0.001). However, minor interfacial gaps between sealer and dentin were observed with the BC sealer (p = 0.04). The technique of obturation in different root canal sections did not significantly affect the sealer adaptability. CONCLUSION: The type of gutta-percha as well as the sealer had a noticeable impact on the adaptability. CLINICAL RELEVANCE: Different obturation techniques will result in similar outcomes. However, within the limitations of the study, there seems to be no advantage in using the BC gutta-percha.


Assuntos
Compostos de Cálcio/química , Resinas Epóxi/química , Guta-Percha/química , Microscopia Eletrônica de Varredura , Materiais Restauradores do Canal Radicular/química , Obturação do Canal Radicular/métodos , Silicatos/química , Dente Pré-Molar , Humanos , Processamento de Imagem Assistida por Computador , Técnicas In Vitro , Teste de Materiais , Distribuição Aleatória , Propriedades de Superfície
19.
Braz. oral res. (Online) ; 32: e18, 2018. tab, graf
Artigo em Inglês | LILACS | ID: biblio-889488

RESUMO

Abstract: The aim of this study was to evaluate the bond strength of different triccalcium silicate cements to retrograde cavity using a push out test. Thirty maxillary central incisors were shaped using #80 hand files and sectioned transversally. Root slices were obtained from the apical 4 mm after eliminating the apical extremity. The specimens were embedded in acrylic resin and positioned at 45° to the horizontal plane for preparation of root-end cavities with a diamond ultrasonic retrotip. The samples were divided into three groups according to the root-end filling material (n = 10): MTA Angelus, ProRoot MTA and Biodentine. A gutta-percha cone (#80) was tugged-back at the limit between the canal and the root-end cavity. The root-end cavity was filled and the gutta-percha cone was removed after complete setting of the materials. The specimens were placed in an Instron machine with the root-end filling turned downwards. The push-out shaft was inserted in the space previously occupied by the gutta-percha cone and push out testing was performed at a crosshead speed of 1.0 mm/min. There was no statistically significant difference in resistance to push out by the materials tested (p > 0.01). MTA Angelus and ProRoot MTA showed predominantly mixed failure while Biodentine exhibited mixed and cohesive failures. The tricalcium silicate-based root-end filling materials showed similar bond strength retrograde cavity.


Assuntos
Humanos , Bismuto/química , Compostos de Cálcio/química , Colagem Dentária/métodos , Cavidade Pulpar/efeitos dos fármacos , Dentina/efeitos dos fármacos , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Análise de Variância , Falha de Restauração Dentária , Guta-Percha/química , Teste de Materiais , Reprodutibilidade dos Testes , Propriedades de Superfície/efeitos dos fármacos , Raiz Dentária/efeitos dos fármacos
20.
J Endod ; 43(12): 2097-2101, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29032816

RESUMO

INTRODUCTION: This study evaluated setting time (ST), radiopacity, pH, flow, solubility, and volumetric change (VC) of a silicone, gutta-percha, and bioactive glass-based sealer, GuttaFlow Bioseal (GFB), and a calcium silicate-based sealer, TotalFill BC Sealer (TFBC), in comparison with AH Plus. METHODS: ST and flow were evaluated in accordance with the ISO 6876 Standard. pH was evaluated after different time intervals (1, 3, 7, 14, 21, and 28 days). Radiopacity was evaluated by radiographic analysis in millimeters of aluminum. Solubility was evaluated by means of mass loss (%) after 7 and 30 days of immersion in distilled water. VC was evaluated by micro-computed tomography, by using cavities 3 mm deep and 1 mm in diameter in acrylic resin, filled with the materials. The materials were evaluated after setting and after 7 and 30 days of immersion in distilled water. The data were submitted to analysis of variance and Tukey statistical tests (P < .05). RESULTS: TFBC demonstrated the highest pH and solubility. GFB had the shortest ST, and lowest radiopacity and flow values. VC was similar for the sealers in both time intervals. CONCLUSIONS: TFBC presented the highest pH and solubility, but showed similar VC to GFB and AH Plus. GFB showed proper physicochemical properties. Micro-computed tomography complements the physicochemical analysis of endodontic sealers.


Assuntos
Dimetilpolisiloxanos/química , Resinas Epóxi/química , Guta-Percha/química , Materiais Restauradores do Canal Radicular/química , Compostos de Cálcio/química , Fenômenos Químicos , Combinação de Medicamentos , Vidro/química , Teste de Materiais , Silicatos/química , Silicones/química
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