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1.
Chemosphere ; 262: 127924, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-32805661

RESUMO

Cr(VI) compounds at high temperature usually tend to decompose and reduce into Cr(III) due to thermodynamically instability for Cr(VI). This study found Cr(VI) could be reduced into Cr(V) instead of Cr(III) in the presence of CaO during heating solid waste containing Cr(VI). CaCrO4 is prepared and mixed with CaO as simulated solid waste containing Cr(VI). It was found that CaCrO4 reacted with CaO and formed a new product Ca5(CrO4)3O0.5 at temperature range of 800 and 1000 °C. The valence state of Cr in Ca5(CrO4)3O0.5 is determined to be +5 b y XPS analysis, and the color for new formed Cr(V) is observed in green, similar to Cr(III) compounds. The temperature and CaO are two keys to arouse the reduction reaction of Cr(VI) into Cr(V). In particular, the reduction of Cr(VI) into Cr(V) is strongly depended on temperature (800-1000 °C), this reaction can be balanced within 10 min, while prolonging sintering time has little help for promoting the reduction of Cr(VI) to Cr(V). Additionally, it was found Cr(V) can keep stable and not be re-oxidized into Cr(VI) at 800-1000 °C. Above results offers some new understanding and knowledge about the formation of Cr(V) in presence of much CaO or CaCO3 during heating solid waste containing Cr(VI).


Assuntos
Cromo/química , Eliminação de Resíduos/métodos , Hidróxido de Cálcio/química , Calefação , Temperatura Alta , Oxirredução , Resíduos Sólidos , Temperatura
2.
Braz Dent J ; 31(5): 493-498, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33146332

RESUMO

This clinical study reports on the antibacterial effects and outcome of endodontic treatment using either a single-file or a multifile system, associated with calcium hydroxide interappointment medication. The root canals of single-rooted teeth with apical periodontitis were treated by using either Reciproc or BioRaCe instrument systems, 2.5% NaOCl irrigation, and calcium hydroxide medication. Bacteriological samples taken before preparation and immediately before obturation were evaluated for total bacterial counts by quantitative real-time polymerase chain reaction (qPCR). Patients were followed up and the treatment outcome was assessed by clinical and radiographic criteria. Decreasing lesions were classified as success in a lenient criterion or failure in a rigid one. Bacteria were detected in all initial samples (47 cases) and were significantly reduced after treatment in both groups (p<0.001). In the Reciproc and BioRaCe groups, 7/25 (28%) and 11/22 (50%) root canals yielded negative qPCR results before obturation, respectively (p>0.05). Quantitative bacterial reduction was similar between groups (p>0.05). The success rate in the BioRaCe group was 95.5% and 77% in the loose and rigid criterion, respectively. In the Reciproc group, corresponding figures were 88% and 76%. Differences in outcome were not significant (p>0.05). No diseased case showed negative qPCR results for bacteria. A difference of >1 Log10 counts was observed between healed and diseased cases. Root canal treatments of teeth with apical periodontitis using a single-file or a multifile system for preparation, associated with NaOCl irrigation and calcium hydroxide interappointment medication, showed similar antibacterial effectiveness and success rate.


Assuntos
Cavidade Pulpar , Periodontite Periapical , Hidróxido de Cálcio , Clorexidina , Desinfecção , Humanos , Periodontite Periapical/tratamento farmacológico , Irrigantes do Canal Radicular , Preparo de Canal Radicular , Hipoclorito de Sódio
3.
Braz Dent J ; 31(6): 598-604, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33237230

RESUMO

The aims of this study were to evaluate the physical and chemical properties, cytotoxicity and dentinal tubule penetration of a new calcium silicate-based root canal dressing. For pH and calcium ion release evaluation (1, 24, 72 and 168 h) were used a pH meter and colorimetric spectrophotometer, respectively. Radiopacity evaluation followed the ISO 6876:2012. Cytotoxicity was evaluated by the percentage of cell viability using MTT assay. Illustrative images of dentinal tubule penetration were obtained using confocal laser scanning microscopy (CLSM). Data from pH and calcium ion release were statistically analyzed by two-way analysis of variance and Tukey test. Radiopacity was analyzed using the Student t-test. The statistical tests for cytotoxicity results were the one-way analysis of variance and Tukey test. Both materials showed alkaline pH in all experimental times. The pH values for calcium hydroxide paste were higher than bioceramic paste at 1, 24, and 72 h (p<0.05). The calcium ion release of bioceramic was lower than the calcium hydroxide paste only at 24 h (p<0.05). The bioceramic was more radiopaque than the calcium hydroxide paste (p<0.05). Bioceramic paste presented a dose and time-dependent cytotoxic effect after MTT assay. CLSM images showed absence of tubule penetration for both pastes. The new calcium silicate-based canal dressing presented alkaline pH, high calcium release, and acceptable radiopacity. Bio C Temp showed a dose and time-dependent cytotoxic and absence of dentinal tubule penetration.


Assuntos
Materiais Restauradores do Canal Radicular , Bandagens , Compostos de Cálcio/toxicidade , Hidróxido de Cálcio/toxicidade , Cavidade Pulpar , Humanos , Silicatos
4.
J Contemp Dent Pract ; 21(6): 632-635, 2020 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-33025931

RESUMO

AIM: To compare the effect of three different intracanal medicaments, namely, modified triple antibiotic paste (MTAP), calcium hydroxide (Ca(OH)2), and aloe vera, on the root dentine microhardness. MATERIALS AND METHODS: A total of 50 extracted mandibular bicuspids were prepared using ProTaper Next rotary files. The roots of the bicuspids were alienated to three groups (n = 10 each) and one control group (untreated; n = 20). In three groups, the root canals were filled with MTAP, Ca(OH)2, and aloe vera medicaments. After 21 days, medicaments were removed by Endo activator. Mean Knoop hardness numbers were calculated after treatment and compared with the untreated control group. Data were evaluated using the Student's t test (paired), ANOVA (one-way) followed, and the post hoc test. RESULTS: All treated groups except the aloe vera group had shown significant reduction (p < 0.05) in microhardness of the root dentin as compared with the untreated control group. The aloe vera group showed least reduction of microhardness and was statistically insignificant (p > 0.05). CONCLUSION: Aloe vera shows promising results in terms of fewer effects on microhardness of the root dentin compared to MTAP and Ca(OH)2. CLINICAL SIGNIFICANCE: Elimination of most of the bacterial infection from the root canal and very minimum to no effect on the microhardness of the dentin in the root part are the basics of success in any endodontic treatment. Further in vivo studies are required to compare the efficacy of these intracanal medicaments.


Assuntos
Aloe , Óxido de Zinco , Antibacterianos , Hidróxido de Cálcio , Dentina , Humanos
7.
J Appl Oral Sci ; 28: e20200217, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32997087

RESUMO

OBJECTIVE: Pulp revascularization is an effective treatment for immature necrotic teeth. Calcium hydroxide has been used in pulp revascularization as an intracanal medication due to its antimicrobial action and the non-exhibition of crown discoloration and cytotoxicity for stem cells from the apical papilla. Our study aimed to investigate the clinical success and quantitative radiographic changes of root development in immature traumatized teeth using calcium hydroxide plus 2% chlorhexidine gel as intracanal medication. METHODOLOGY: In this retrospective study, 16 patients were treated with a standardized pulp revascularization protocol. Calcium hydroxide and 2% chlorhexidine gel were manipulated in a 1:1 (v/v) ratio and inserted into root canals with Lentulo spirals (Dentsply Maillefer, Baillaigues, Switzerland). Patients were followed up for a period from 9 to 36 months for the evaluation of clinical and radiological data. Radiographic measurements of root length, root width, apical diameter, and MTA placement from the apex were quantified using software ImageJ. Wilcoxon test and t-test were used, according to nonparametric or parametric data, respectively, for changes over time in root length, root width, and apical diameter. RESULTS: Fifteen teeth survived during the follow-up period (93.75%) and met the criteria for clinical success. Although the changes seem to be very small in many cases, significant increases in the average root length (14.28%, p<0.0001), root width (8.12%, p=0.0196), and decrease in apical diameter (48.37%, p=0.0007) were observed. MTA placement from the apex and age at the time of treatment was not significantly associated with the quantitative radiographic outcomes. CONCLUSIONS: Pulp revascularization in traumatized immature teeth treated with calcium hydroxide plus 2% chlorhexidine gel as intracanal medication had high success and survival rates, showing periodontal healing and resolution of signs and symptoms. However, concerning the continued root development, the outcomes can still be considered unpredictable.


Assuntos
Hidróxido de Cálcio , Clorexidina , Polpa Dentária/irrigação sanguínea , Irrigantes do Canal Radicular/uso terapêutico , Adolescente , Hidróxido de Cálcio/uso terapêutico , Criança , Clorexidina/uso terapêutico , Necrose da Polpa Dentária/tratamento farmacológico , Feminino , Humanos , Masculino , Estudos Retrospectivos , Ápice Dentário , Resultado do Tratamento
8.
Acta Odontol Latinoam ; 33(2): 82-89, 2020 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-32920609

RESUMO

The aim of this study was to evaluate the degree of conversion, cytotoxicity, solubility and pH of photopolymerizable calciumbased cements submitted to preheating. The degree of conversion was analyzed by Fourier transform infrared, cytotoxicity by the MTT test and solubility through loss of mass. The data were subjected to statistical tests (ANOVA / Tukey's, p<0.05). The photopolymerizable materials showed a low degree of conversion, regardless of preheating. All materials caused a reduction in cell viability at 24 hours and 7 days, with the Dycal (control) being more cytotoxic. Heat had a positive effect on Biocal at 7 days. Dycal is the most soluble material. Heat had no effect on the solubility or pH of the polymerizable materials. It is concluded that photopolymerizable calcium-based cements have a low degree of conversion and are soluble, which results in mild to moderate cytotoxicity.


Assuntos
Hidróxido de Cálcio/toxicidade , Sobrevivência Celular/efeitos dos fármacos , Cimentos Dentários/química , Agentes de Capeamento da Polpa Dentária e Pulpectomia/toxicidade , Cálcio , Hidróxido de Cálcio/química , Cimentos Dentários/toxicidade , Capeamento da Polpa Dentária , Humanos , Concentração de Íons de Hidrogênio , Cura Luminosa de Adesivos Dentários , Processos Fotoquímicos , Polimerização , Agentes de Capeamento da Polpa Dentária e Pulpectomia/química
9.
Artigo em Inglês | MEDLINE | ID: mdl-32925992

RESUMO

This in vivo study assessed calcium hydroxide's effect as a matrix carrier for recombinant human platelet-derived growth factor (rhPDGF) and enamel matrix protein (EMD) on pulp tissue healing following pulp capping. Intact premolar sites (n = 18) were included. Coronal access and pulpotomy were performed, and each tooth was exposed to the oral cavity for 1 hour before pulp capping was performed. Teeth were randomly assigned to one of the following pulp-capping groups (n = 6 each): Group 1 (CaOH2 only); Group 2 (CaOH2+EMD); and Group 3 (CaOH2+rhPDGF). Coronal access cavities were then sealed. Immediate preoperative, postoperative, and 4-month follow-up radiographs were taken. At 4 months, teeth were extracted atraumatically and histomorphometric and micro-CT analyses were performed. Group 1 showed formation of thin, uneven, highly porous dentin-like structure with tunnel defects (average thickness: 0.18 to 0.19 mm). Lack of continuity of the newly formed tissue and interrupted communication tunnels were seen between the pulpal space and pulp-capping material. Group 2 showed formation of highly dense, nonporous, even-thickness dentin-like structure obliterating multiple areas of the pulp space (average thickness: 0.9 to 0.94 mm). Abundant odontoblast lacunae were present in the pulp and structure. Group 3 showed formation of an inconsistent, uneven dentin-like structure that appeared highly porous (average thickness: 1.04 to 1.05 mm). It was without tunneling, and abundant odontoblastic lacunae were present. No statistically significant differences were found between Groups 2 and 3, but both were richer in newly formed dentin-like structure with more thickness than Group 1 (P < .05). Addition of EMD to CaOH2 can result in multiple root canal calcifications, mostly in the coronal and apical thirds of the canals. The calcified tissue does not appear to resemble secondary dentin in form, shape, amount, or density. Addition of rhPDGF to CaOH2 may not cause root canal calcifications. The newly formed structure differs from secondary dentin in degree of mineralization, porosity, and density.


Assuntos
Hidróxido de Cálcio , Capeamento da Polpa Dentária , Dentina Secundária , Polpa Dentária , Humanos , Pulpotomia
10.
J Endod ; 46(9S): S150-S160, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32950187

RESUMO

Two increasingly common endodontic procedures, vital pulp therapy (VPT) and regenerative endodontic procedures, rely on dental tissue regeneration/repair mechanisms with the aid of biomaterials. These materials are applied in close contact to the pulpal tissue and are required to be biocompatible, form an antimicrobial seal, not induce staining, and be easy to manipulate. Historically, calcium hydroxide played an important role in VPT. However, over the last 3 decades, significant efforts in research and industry have been made to develop various biomaterials, including hydraulic tricalcium silicate cements. The present review summarized various hydraulic tricalcium silicate cements and their biological properties in clinical procedures, namely VPT and regenerative endodontic procedures.


Assuntos
Compostos de Cálcio , Silicatos , Hidróxido de Cálcio , Polpa Dentária , Capeamento da Polpa Dentária , Endodontia Regenerativa
11.
Niger J Clin Pract ; 23(9): 1237-1242, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32913162

RESUMO

Aims: We evaluated and compared EndoActivator, CanalBrush, and passive ultrasonic irrigation (PUI) in the removal of calcium hydroxide and calcium hydroxide with iodoform and p-chlorophenol paste (Calcipast Forte) from artificial standardized grooves in the apical third of root canals. Materials and Methods: A total of 34 mandibular premolars were prepared and then split longitudinally. A standardized groove was prepared in the apical part of both segments. The grooves were filled with either calcium hydroxide or Calcipast Forte, and the segments were reassembled. CanalBrush, EndoActivator, or PUI were used. The amount of remaining medicament was evaluated using a four-grade scoring system. Results: None of the irrigation methods could completely remove the pastes from the grooves. More Calcipast Forte paste was detected compared with calcium hydroxide (P < 0.01). PUI was the least effective method in removing Calcipast Forte. Conclusions: It was more difficult to remove Calcipast Forte than a water-based calcium hydroxide paste.


Assuntos
Hidróxido de Cálcio/química , Clorofenóis , Cavidade Pulpar/patologia , Hidrocarbonetos Iodados , Materiais Restauradores do Canal Radicular/química , Irrigantes do Canal Radicular/administração & dosagem , Terapia por Ultrassom/métodos , Humanos , Irrigantes do Canal Radicular/química , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/métodos , Irrigação Terapêutica/métodos , Terapia por Ultrassom/instrumentação , Ultrassom , Água
12.
Evid Based Dent ; 21(3): 108-109, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32978545

RESUMO

Data sources MEDLINE (via PubMed), EMBASE, the Cochrane library (CENTRAL) and the clinicaltrials.gov database were used as the data sources for the systematic review. Date restrictions were from database inception to October 2018 and only articles published in English were included. Hand searching of reference lists was carried out. Missing data was sought from authors if required for analysis.Study selection Two independent researchers identified randomised controlled trials assessing the outcomes of pulpotomy procedures on vital permanent teeth with immature apices. Studies were only included if they reported clinical and radiographic success rates. After full text assessment, any disagreement between reviewers was resolved via discussion.Data extraction and synthesis Data extraction was carried out using a table which was custom designed for this study. Accuracy of data was checked by a third reviewer. Strict criteria for healing were used for clinical and radiographic outcomes. Success rates were calculated for each intervention. Statistical testing on the data was completed using a fixed- or random-effect model depending on heterogeneity identified, using the i2 test. Results were presented as relative risks with 95% confidence intervals. Two independent reviewers assessed the quality of studies using the Cochrane risk of bias assessment tool.Results Following screening of 1364 articles, five studies were included for qualitative analysis and two for quantitative analysis. All included studies were assessed as having a high risk of bias, which was attributed to the nature of the intervention and challenges in blinding the researcher. Four out of the five included studies were assessed as having a low risk of bias for detection, because of blinding of the investigator assessing the outcome. The remaining study had an unclear risk of bias for this parameter. No significant difference was detected between mineral trioxide aggregate (MTA) and calcium hydroxide (CH) at 6 months or 12 months post-treatment. MTA was also compared to platelet-rich fibrin (PRF), calcium-enriched mixture (CEM) and triple antibiotic paste (TAP) in individual studies with no statistically significant differences identified between groups. Significant clinical and radiographic differences were observed in favour of MTA and TAP compared to abscess remedy (AR), although this was noted as weak evidence.Conclusions Based on the present evidence, there were similar success rates when using MTA, CH, CEM, RPF and TAP as medicaments for pulpotomies in the treatment of immature permanent teeth. More high-quality RCTs are needed in this field in future studies.


Assuntos
Dentição Permanente , Pulpotomia , Hidróxido de Cálcio
13.
Dental Press J Orthod ; 25(3): 20-29, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32844973

RESUMO

Endodontically treated teeth may be moved, as endodontic treatment is not a contraindication for orthodontic treatment. Apical periodontal repair begins when the periapical or pulp lesion has completely resolved. This may happen immediately after treatment if the filling material causes little or no irritation of periapical tissues, and particularly if the material is fully contained within the canal. When it leaks, a foreign body granuloma forms and persists for some months or indefinitely, depending on the composition of the filling material. Materials containing calcium hydroxide with no resin components undergo phagocytosis and disappear in some months, as macrophages gradually remove them. Materials containing resins, silicone, ionomers, zinc oxide-eugenol, bioceramics or gutta-percha remain in the site and induce the formation of foreign body granulomas. Although this does not preclude tooth movement, patients should be followed up every three months using periapical images to control the position of the material in relation to the tooth apex. "Pseudo" overfilling may be avoided if permanent filling is delayed until the time when orthodontic treatment is completed.


Assuntos
Endodontia , Ortodontia , Hidróxido de Cálcio , Tomada de Decisão Clínica , Guta-Percha , Humanos , Cimento de Óxido de Zinco e Eugenol
14.
Braz Oral Res ; 34: e089, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32785478

RESUMO

In this study, we evaluated the physicochemical properties (PCP; radiopacity, flow, pH, and solubility) and the quality of root canal filling provided by an experimental industrialized paste (EP), with the same active ingredients as those of the Guedes Pinto paste, compared with the Vitapex® paste. PCP were analyzed according to the ANSI/ADA laboratory testing methods for endodontic filling and sealing materials. To analyze filling capacity, 120 artificial primary teeth (60 maxillary incisors [MIs] and 60 mandibulary molars [MMs]) were endodontically treated. The teeth were divided into eight groups based on the dental group (MIs or MMs), filling material (Vitapex® or EP), and insertion method (syringe or lentulo). The Image J® software was used to analyze the initial an final digital radiographies of each tooth, measuring and comparing root canal and void areas. The percentage of filling failure areas was obtained. Data were submitted to ANOVA and Tukey test of mean comparison. Regarding PCP, both pastes presented results according the ANSI/ADA standards. Flow capacity: Vitapex: 19.6 mm, EP: 25 mm (p < 0.01); radiopacity: Vitapex: 4.47 mmAl, EP: 6.06 mmAl (p < 0.01); pH after 28 days: Vitapex: 7.79, EP: 8.19 (p = 0.12); and solubility after 28 days: Vitapex: 2.68%, EP: 2.89% (p > 0.05). Regarding filling capacity analysis, EP demonstrated 12.5% of failure against 31.5% of Vitapex (p < 0.01). Compared to Vitapex, EP presented statistically significantly better results in flow, radiopacity, pH, and filling capacity. Molars presented more filling failures than incisors. The insertion method using a syringe and a thin tip was significantly better than that using Lentulo spiral carriers.


Assuntos
Radiografia Dentária Digital , Dente Decíduo , Hidróxido de Cálcio , Hidrocarbonetos Iodados , Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular
15.
Pediatr Dent ; 42(4): 256-461, 2020 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-32847665

RESUMO

Purpose: The purpose of this systematic review and meta-analysis was to assess success rates for nonvital treatment in primary teeth for caries/trauma. Methods: Databases were searched between 1960 and 2020 for randomized controlled trials, cohorts, case series, and in vitro studies. The primary outcome was overall success (clinical and radiographic) for pulpectomy and lesion sterilization tissue repair (LSTR). Included articles were independently determined, agreed upon, data extraction assessed, risk of bias, meta-analyses, and assignment of quality of evidence (GRADE). Results: Comparing teeth with and without root resorption, pulpectomy success was better (P<0.001) in teeth without preoperative root resorption. Success with pulpectomies performed with zinc oxide eugenol [ZOE] and with Endoflas (ZOE plus iodoform plus calcium hydroxide) did not differ from that observed using Vitapex or Metapex (iodoform plus calcium hydroxide; P≥0.50) after 18 months; however, Endoflas and ZOE success rates remained near 90 percent versus 71 percent or less for iodoform. Network analysis ratings showed Endoflas and ZOE performed better than iodoform alone. Also, LSTR performed better (P<0.001) than pulpectomies in teeth with preoperative root resorption, but pulpectomy results were superior (P=0.09) if roots were intact. Rotary instrumentation of root canals was significantly faster (P<0.001) than manual instrumentation. Success rates were not impacted by method of obturation or root length determination, type of tooth, number of visits, irrigants, smear layer removal, or timing/type of final restoration. Conclusions: Eighteen-month success rates support Endloflas and zinc oxide eugenol pulpectomies over iodoform pulpectomies. Lesion sterilization tissue repair had limited indication for teeth with resorbed roots.


Assuntos
Cárie Dentária , Materiais Restauradores do Canal Radicular , Reabsorção da Raiz , Hidróxido de Cálcio , Humanos , Pulpectomia , Dente Decíduo , Cimento de Óxido de Zinco e Eugenol
16.
Rev. cient. odontol ; 8(2): e015-e015, mayo-ago. 2020. ilus, tab
Artigo em Espanhol | LILACS, LIPECS | ID: biblio-1118804

RESUMO

Objetivo: Comparar la resistencia de unión a la dentina del cemento sellador tipo Grossman (Grossdent) y Apexit Plus (Ivoclar Vivadent) después de la medicación intraconducto de hidróxido de calcio Ca(OH)2 con vehículos de paramonoclorofenol alcanforado (PMCFA) y de clorhexidina al 2% (CHX). Metodología: Estudio experimental in vitro. Se seleccionó una muestra de 44 dientes humanos monorradiculares y fueron divididos en 4 grupos con medicación intraconducto (n = 9) y 2 grupos control. Los dientes fueron desinfectados y los conductos radiculares instrumentados usando una técnica híbrida. Se medicaron dos grupos con hidróxido de calcio más PMCFA y dos grupos con hidróxido de calcio más CHX 2% durante dos semanas. De cada grupo con medicación uno fue obturado con cemento sellador endodóntico Grossman y el otro con Apexit Plus, mediante la técnica de compactación lateral. Los grupos control fueron obturados solo con los dos cementos anteriormente mencionados. Se cortaron las muestras en discos de 2 mm de espesor y fueron sometidas a prueba de empuje con una máquina de ensayo universal. Resultados: El valor de la media más alta lo obtuvo el grupo medicado con Ca(OH)2 más PMCFA y obturado con Apexit Plus (m 3,742 y DE 0,808), mientras que el valor más bajo lo presentó el grupo de Ca(OH)2 más PMCFA obturado con cemento Grossman (m 1,371 y DE 0,699), presentaron diferencias significativas (p < 0,001). Conclusión: La resistencia de unión a la dentina radicular se ve influenciada por la medicación intraconducto previa a la obturación endodóntica. (AU)


Objective: Compare the dentin bond strength of Grossman ́s sealer (Grossdent) and Apexit Plus sealer (IvoclarVivadent) after intra-canal medication of calcium hydroxide Ca(OH)2 associated with vehicles of camphorated parachlorophenol (CMPC) and chlorhexidine 2% (CHX). Methodology: This was an in vitro experimental study. A sample of 44 monoradicular human teeth were disinfected and divided into 4 groups of intra-canal medication (N= 9) and 2 control groups. The teeth were disinfected and root canals were instrumented using a hybrid technique. Two groups were medicated with Ca(OH)2 and CMPC and two groups with Ca(OH)2 and CHX 2% for two weeks. One group of each medication was filled with Grossman ́s sealer and the others with Apexit Plus sealer using the lateral compaction technique. The control groups were filled only with the two sealers mentioned previously. Samples were cut into 2 mm thick discs and placed on a push test with a universal testing machine. Results: The highest value of the means was obtained by the group medicated with Ca(OH)2 in association with CMPC and filled with Apexit Plus (m 3.742; SD 0.808), while the lowest value was presented by the group of Ca(OH)2 associated with CMPC, filled with Grossman ́s sealer (m 1,371; SD 0.699). Statistical differences were considered with p<0.001. Conclusion: Root dentin bond strength is influenced by intra-canal medication prior to endodontic filling. (AU)


Assuntos
Humanos , Selantes de Fossas e Fissuras , Tratamento do Canal Radicular , Hidróxido de Cálcio/uso terapêutico , Endodontia , Epidemiologia Experimental
17.
Rev. Odontol. Araçatuba (Impr.) ; 41(2): 28-33, maio-ago.2020. tab, graf
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-1102669

RESUMO

O objetivo do presente estudo foi avaliar o pH externo radicular de dentes bovinos pré-selecionados. Neste estudo foram utilizadas soluções irrigadoras, ácido peracético 0,25%, hipoclorito de sódio 2,5% e hipoclorito de sódio 6% associadas ao EDTA e as medicações intracanais, ultracal, hidróxido de cálcio P.A. associado à clorexidina gel 2% e hidróxido de cálcio P.A. associado ao propilenoglicol. O Preparo químico mecânico foi realizado com as limas easy logic e as soluções agitadas com easy clean durante 3 minutos, após os dentes foram imersos em água deionizada em eppendorfs estéreis e mantidos em estufa a 37°C. O pH externo foi mensurado utilizando fitas de pH no período de 3, 24, 72 horas, 7 e 14 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 os grupos apresentaram diferença estatística entre eles, entretanto apresentaram alcalinidade durante o período avaliado de 24, 48,72 horas, 7 e 14 dias. Concluiu-se que as soluções associadas às diferentes medicações mostraram pH alcalino, apresentando diferença entre os grupos avaliados nos tempos de 3, 24, 72 horas, 7 e 14 dias, no entanto mostraram resultados satisfatórios, podendo ser utilizados na endodontia(AU)


The objective of the present study was to evaluate the external root pH of pre-selected bovine teeth. In these study irrigation solutions, 0.25% peracetic acid, 2.5% sodium hypochlorite, sodium hypochlorite 6% associated with EDTA and intracanal medications, ultracal, calcium hydroxide PA associated with chlorhexidine gel 2% and P.A. calcium hydroxide associated with propyleneglycol. The mechanical chemical preparation was performed with the easylogic files and the solutions stirred with easy clean for 3 minutes, after the teeth were immersed in deionized water in sterile eppendorfs and kept in an oven at 37 °C. The external pH was measured using pH tapes in the period of 3, 24, 72 hours, 7 and 14 days. The normal values obtained from each test were tested using the KolmogorofSmirnov test and the statistical test chosen was oneway ANOVA and Tukey's multiple comparisons. The results showed that the groups presented statistical difference between them, however they presented alkalinity during the evaluated period of 24, 48, 72 hours, 7 and 14 days. It was concluded that the solutions associated with the different medications showed alkaline pH, presenting a difference between the groups evaluated at 3, 24, 72 hours, 7 and 14 days, however they showed satisfactory results and could be used in endodontics(AU)


Assuntos
Materiais Restauradores do Canal Radicular , Preparo de Canal Radicular , Ácido Peracético , Tratamento do Canal Radicular , Hipoclorito de Sódio , Hidróxido de Cálcio , Clorexidina , Ácido Edético , Propilenoglicol
18.
J Am Dent Assoc ; 151(8): 553-554, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32718475
19.
J Am Dent Assoc ; 151(8): 553, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32718476
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