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1.
Aust Endod J ; 2020 Dec 28.
Artigo em Inglês | MEDLINE | ID: mdl-33368839

RESUMO

This study aimed to determine the accuracy of four electronic apex locators (EALs) (I-Root, Propex Pixi, Novapex and Bassi iRoot Apex), using artificial mandibular and maxillary permanent molars. The root length (RL) from 40 artificial teeth was initially determined with Kerr hand files. Then, the electronic RL were obtained for the same root canals with each EAL, and the results were compared with those obtained using hand files. The accuracy of the EALs was determined through analysis of the divergences observed in relation to the lengths obtained with files. All EALs were effective for determining the RL in the artificial teeth, showing results similar to those obtained by hand. The Bassi iRoot Apex had higher accuracy (96.7%) than the Propex Pixi (89.1%) and Novapex (85.8%) (P < 0.05). Based on the results, all EALs tested had a similar performance, and artificial teeth may be used to determine the accuracy of these devices.

2.
Aust Endod J ; 46(1): 82-87, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31556201

RESUMO

The aim of this study was to compare, by micro-computed tomography (micro-CT) analysis, the obturation quality of two filling methods: the single-cone technique with the bioceramic EndoSequence BC sealer and the continuous wave technique with the resin-based AH Plus sealer. Twenty mandibular molars were divided into two groups (n = 10) according to the sealer used. Only the mesial roots, which are known to have mostly two canals, were used. The specimens were scanned before and after instrumentation and after obturation. Root canal volume after instrumentation and filling volume were calculated to obtain the percentage volumes of filling, voids and gaps. All specimens presented final volumes that were smaller than the initial volumes (P < 0.05). There was no significant difference between groups for filling volume, voids and gaps (P > 0.05). Using two filling methods, EndoSequence BC and AH Plus promoted a similar root filling quality in mesial roots of mandibular molars. Neither sealer was able to fill the root canal system completely.


Assuntos
Cavidade Pulpar , Materiais Restauradores do Canal Radicular , Resinas Epóxi , Dente Molar , Obturação do Canal Radicular , Microtomografia por Raio-X
3.
J Craniomaxillofac Surg ; 46(9): 1576-1585, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-30097409

RESUMO

Among the systemic conditions that impact negatively on the planning and execution of surgical procedures, diabetes mellitus (DM) is the primary clinical condition responsible for complications. This study investigated bone formation in critical defects surgically filled with hydroxyapatite (HA) in diabetic rats. A descriptive, randomized sample and blinded analysis were conducted to test bone regeneration in critical bone defects surgically performed in rat calvaria. Twenty adult male Wistar rats were randomly divided into two groups: control, normoglycemic animals (CG); and test, streptozotocin-induced hyperglycemic animals (TG). A circular bone defect was filled with HA and maintained subperiosteally. The clinical parameters evaluated were body weight, water and food intake, fasting blood glucose, and bone alkaline phosphatase. Bone-grafted area samples were submitted for histomorphometric and stereological analysis. The TG showed a significantly higher rate of new bone formation compared with the CG, sacrificed 15 days after surgery (p < 0.0001). However, at the end of the study, there was no significant difference in the amount of bone formed between groups (p = 0.077). In parallel, with the increase in osteoblastic activity observed in the TG by the measurement of systemic bone alkaline phosphatase (p = 0.016), the analysis of polarized microscopy and stereology demonstrated a lower level collagen maturation and mineralization in the TG. Quantitatively, the TG showed significantly better results for bone gain in the first 15 days. Qualitative assessments, however, showed fewer collagen fibers and bone maturation in the TG compared with the CG both at 15 and 45 days. Therefore, the postoperative evaluation of bone grafts with HA in hyperglycemic situations should consider the systemic and local effects of this condition on the quality of bone repair, rather than identifying the filling or stability of the grafted area after the process. We conclude that clinically detectable bone repair in diabetic animal models submitted to hydroxyapatite grafts may be satisfactory in the early stages. However, hyperglycemia compromises the quality of the newly formed bone and the collagen cross-linking involved in this process.


Assuntos
Regeneração Óssea/efeitos dos fármacos , Substitutos Ósseos/farmacologia , Diabetes Mellitus Experimental/fisiopatologia , Durapatita/farmacologia , Crânio/cirurgia , Animais , Masculino , Distribuição Aleatória , Ratos , Ratos Wistar
4.
Braz. j. oral sci ; 17: e18924, 2018. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-970500

RESUMO

Aim: This study evaluated the effect of a sonic device on the bonding of fiberglass posts cemented with a self-etching adhesive combined with conventional cement or a self-adhesive cement to root dentin. Methods: Forty single-rooted bovine incisors were endodontically prepared using a step-back technique. Gutta-percha and AH Plus sealer were used for root canal filling, combined with a thermoplasticization technique. After 1 week, the post space was prepared and the roots were divided into four groups according to the following factors: adhesive system/resin cement (Ambar/ AllCem Core [FGM] and RelyX U200 [3M]) and application mode (manual or sonic). The posts were cemented and the roots were cut into discs and submitted to push-out bond strength (POBS) test. The failure mode was evaluated using a stereoscope at 25x magnification. The data were analyzed statistically using ANOVA and Tukey's post-hoc test (α = 0.05). Results: The sonically activated RelyX U200 group was superior to the other groups. RelyX U200 manually applicated showed similar results to those of sonically activated Âmbar/AllCem. These three groups outperformed the Âmbar/AllCem manually applicated group. Adhesive failure between dentin and resin cement was the most predominant pattern. Conclusion: Sonic application of self-etching adhesive and self-adhesive cement improved the POBS of fiber posts to the root canal


Assuntos
Animais , Bovinos , Colagem Dentária , Cimentos Dentários , Pinos Dentários , Cavidade Pulpar , Análise do Estresse Dentário
5.
J Appl Oral Sci ; 25(4): 396-403, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28877278

RESUMO

Objective: The aim of this study was to evaluate the effect of photodynamic therapy (PDT) and non-thermal plasma (NTP) on adhesion and sealer penetration in root canals. Material and Methods: Sixty single-rooted premolars were used. The teeth were prepared using a crown-down technique. NaOCl and EDTA were used for irrigation and smear layer removal, respectively. The root canals were divided into three groups: control, PDT, and NTP. After treatments, the roots were filled using gutta-percha and either AH Plus (AHP) or MTA Fillapex (MTAF) sealers. Samples were sectioned at 4, 8, and 12 mm from the apex (1-mm slices)and analyzed by the push-out bond strength test (adhesion) and confocal laser scanning microscopy (sealer penetration). Data were statistically evaluated using Kruskal-Wallis, Dunn's, and Spearman's tests. Results: Regarding AHP, bond strength was similar in the NTP group and in the control group, but significantly lower in the PDT group. As to MTAF, both therapies showed lower values than the control group. In the confocal analysis of AHP, maximum and mean penetration, and penetrated area were statistically higher in the control group than in the PDT and NTP groups. Penetrated perimeter was similar among groups. Regarding MTAF, all parameters yielded better results in the NTP than in the control group. The PDT and control groups showed similar results except for penetrated area. Conclusion: PDT and plasma therapy affected the adhesion and sealer penetration of root canals filled with AH Plus and MTA Fillapex and there is no positive correlation between adhesion and sealer penetration.


Assuntos
Compostos de Alumínio/química , Compostos de Cálcio/química , Cavidade Pulpar/efeitos dos fármacos , Resinas Epóxi/química , Óxidos/química , Fotoquimioterapia/métodos , Gases em Plasma/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Colagem Dentária/métodos , Combinação de Medicamentos , Humanos , Teste de Materiais , Microscopia Confocal , Valores de Referência , Reprodutibilidade dos Testes , Obturação do Canal Radicular/métodos , Estatísticas não Paramétricas
6.
J. appl. oral sci ; 25(4): 396-403, July-Aug. 2017. tab, graf
Artigo em Inglês | LILACS | ID: biblio-893636

RESUMO

Abstract Objective The aim of this study was to evaluate the effect of photodynamic therapy (PDT) and non-thermal plasma (NTP) on adhesion and sealer penetration in root canals. Material and Methods Sixty single-rooted premolars were used. The teeth were prepared using a crown-down technique. NaOCl and EDTA were used for irrigation and smear layer removal, respectively. The root canals were divided into three groups: control, PDT, and NTP. After treatments, the roots were filled using gutta-percha and either AH Plus (AHP) or MTA Fillapex (MTAF) sealers. Samples were sectioned at 4, 8, and 12 mm from the apex (1-mm slices)and analyzed by the push-out bond strength test (adhesion) and confocal laser scanning microscopy (sealer penetration). Data were statistically evaluated using Kruskal-Wallis, Dunn's, and Spearman's tests. Results Regarding AHP, bond strength was similar in the NTP group and in the control group, but significantly lower in the PDT group. As to MTAF, both therapies showed lower values than the control group. In the confocal analysis of AHP, maximum and mean penetration, and penetrated area were statistically higher in the control group than in the PDT and NTP groups. Penetrated perimeter was similar among groups. Regarding MTAF, all parameters yielded better results in the NTP than in the control group. The PDT and control groups showed similar results except for penetrated area. Conclusion PDT and plasma therapy affected the adhesion and sealer penetration of root canals filled with AH Plus and MTA Fillapex and there is no positive correlation between adhesion and sealer penetration.


Assuntos
Humanos , Compostos de Alumínio/química , Compostos de Cálcio/química , Cavidade Pulpar/efeitos dos fármacos , Resinas Epóxi/química , Óxidos/química , Fotoquimioterapia/métodos , Gases em Plasma/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Colagem Dentária/métodos , Combinação de Medicamentos , Teste de Materiais , Microscopia Confocal , Valores de Referência , Reprodutibilidade dos Testes , Obturação do Canal Radicular/métodos , Estatísticas não Paramétricas
7.
Restor Dent Endod ; 42(2): 105-110, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-28503475

RESUMO

OBJECTIVES: This study investigated the cleaning ability of ultrasonically activated irrigation (UAI) and a novel activation system with reciprocating motion (EC, EasyClean, Easy Equipamentos Odontológicos) when used with a relatively new chelating agent (QMix, Dentsply). In addition, the effect of QMix solution when used for a shorter (1 minute) and a longer application time (3 minutes) was investigated. MATERIALS AND METHODS: Fifty permanent human teeth were prepared with K3 rotary system and 6% sodium hypochlorite. Samples were randomly assigned to five groups (n = 10) according to the final irrigation protocol: G1, negative control (distilled water); G2, positive control (QMix 1 minute); G3, QMix 1 minute/UAI; G4, QMix 1 minute/EC; G5, QMix 3 minutes. Subsequently the teeth were prepared and three photomicrographs were obtained in each root third of root walls, by scanning electron microscopy. Two blinded and pre-calibrated examiners evaluated the images using a four-category scoring system. Data were statistically analyzed using Kruskal-Wallis and Dunn tests (p < 0.05). RESULTS: There were differences among groups (p < 0.05). UAI showed better cleaning ability than EC (p < 0.05). There were improvements when QMix was used with auxiliary devices in comparison with conventional irrigation (p < 0.05). Conventional irrigation for 3 minutes presented significantly better results than its use for 1 minute (p < 0.05). CONCLUSIONS: QMix should be used for 1 minute when it is used with UAI, since this final irrigation protocol showed the best performance and also allowed clinical optimization of this procedure.

8.
J Oral Sci ; 58(4): 561-567, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-28025441

RESUMO

This study evaluated the effects of different auxiliary irrigation devices on smear layer removal with a chelating solution (QMix). Fifty single-rooted permanent human teeth were shaped with a sequence of nickel-titanium instruments. A 2% chlorhexidine gel was used as a chemical auxiliary substance during preparation. Samples were assigned to five groups (n = 10 each) according to final irrigation protocol, namely, distilled water (control group), QMix 1 min, QMix + passive ultrasonic irrigation (PUI), QMix + plastic endodontic finishing file (EC), and QMix 3 min. Teeth were prepared and evaluated by scanning electron microscopy, and three photomicrographs (magnification, 1,000×) were obtained for each root third. Two blinded and precalibrated evaluators analyzed and scored the images, and the data were statistically analyzed by the Kruskal-Wallis and Dunn tests (P < 0.05). Groups were ranked according to the extent of smear layer removal. The total area of the root canal walls and apical root thirds was calculated, and the groups ranked PUI > EC = QMix 3 min > QMix 1 min > control. QMix 1 min was effective for smear layer removal only when used with auxiliary devices, and QMix + passive ultrasonic irrigation yielded the best results, particularly for the apical third.(J Oral Sci 58, 561-567, 2016).


Assuntos
Irrigantes do Canal Radicular , Camada de Esfregaço , Estudos de Casos e Controles , Humanos , Microscopia Eletrônica de Varredura
9.
Rev. bras. odontol ; 73(4): 272-276, Out.-Dez. 2016. ilus
Artigo em Português | LILACS-Express | LILACS | ID: biblio-844041

RESUMO

Objetivo: avaliar o número de aplicações necessárias para a completa obliteração dos túbulos dentinários utilizando diferentes agentes dessensibilizantes. Material e Métodos: a porção do esmalte coronário da face vestibular de 40 incisivos bovinos foi removida com auxílio de lixas para expor a dentina superficial da junção amelo-cementária. Em seguida, as raízes e a porção coronária referente ao terço médio-incisal dos dentes foram removidas. A seguir foi realizada a completa remoção de smear layer, evidenciando os túbulos dentinários. As amostras foram divididas em quatro grupos experimentais conforme o agente dessensibilizante utilizado: verniz fluoretado, adesivo dentinário, dessensibilizante dentinário e creme dental. Os produtos foram aplicados de acordo com as recomendações do fabricante. As amostras foram avaliadas previamente e após o uso dos agentes por microscopia eletrônica de varredura de baixo vácuo. A aplicação do agente e a análise foram realizadas até a completa obliteração dos túbulos dentinários. Os dados foram avaliados estatisticamente em relação ao número de aplicações necessárias utilizando os testes de Kruskal-Wallis e Mann-Whitney (p < 0,05). Resultados: o verniz fluoretado foi o mais eficaz dos agentes avaliados, sendo necessária uma aplicação para a completa obliteração dos túbulos. Para o adesivo dentinário foram necessárias duas aplicações e para o dessensibilizante e o creme dental foram necessárias cinco aplicações. Conclusão: os agentes dessensibilizantes testados necessitam de um número variado de aplicações, sendo o mais eficaz o verniz fluoretado, onde apenas uma aplicação possibilitou a completa obliteração dos túbulos.


Objective: The aim of this study was to evaluate the number of applications necessary for the complete obliteration of dentinal tubules using different desensitizing agents. Materials and Methods: A portion of coronary enamel of the buccal surface of 40 bovine incisors was removed with the aid of sandpaper in order to expose the superficial dentin at the dentin-enamel junction. The roots and the coronary portions of the mesial-incisal third of the teeth were also removed. Complete smear-layer removal was performed, exposing the dentinal tubules. Samples were divided into four experimental groups according to the desensitizing agents used: fluoride varnish; dentin adhesive; dentin desensitizing; and toothpaste. The products were applied in accordance with the manufacturer's recommendations. Samples were evaluated before and after the application of different agents by scanning electronic microscopy of low vacuum. The application of the products and analyses were carried out until complete obliteration of dentinal tubules. Data were evaluated statistically in relation to the required number of applications, using Kruskal-Wallis and Mann-Whitney tests (p < 0.05). Results: The results showed that fluoride varnish was the most efficient of the tested agents, requiring a single application for the complete obliteration of the dentinal tubule. For the dentin adhesive, two applications were necessary and for the dentin desensitizing and toothpaste, five applications were required. Conclusion: The desensitizing agents tested required a distinct number of applications, and the fluoride varnish was the most effective agent, with a single application resulting in the complete obliteration of the dentin tubule.

10.
J Oral Sci ; 58(3): 347-51, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27665973

RESUMO

This study compared the effectiveness of clinical observation, clinical microscopic observation, and tooth-clearing technique in determining the number of canals in mandibular incisors. Root canal ramifications were also analyzed. Using clinical and microscopic analyses, we determined the number of canal entrances in 277 mandibular incisors. In addition, tooth-clearing technique was used to determine the number of canals and frequency of ramifications in the samples. The kappa coefficient was used to compare the different methods with regard to frequency of canals. Most teeth had one canal entrance. The proportion of teeth with two canals was 23.5% by tooth-clearing analysis, 5.8% by clinical microscopy, and 1.1% by clinical analysis. A large number of samples had some type of ramification (40.1%), and most ramifications were present in teeth with two canals. The most frequent ramification was lateral canals (8.3%). Clinical microscopy improved identification of a second canal in mandibular incisors. However, it did not identify second canals in all teeth with two canals. (J Oral Sci 58, 347-351, 2016).


Assuntos
Cavidade Pulpar/anatomia & histologia , Incisivo/anatomia & histologia , Mandíbula/anatomia & histologia , Humanos
11.
Dent. press endod ; 6(2): 41-46, May-Aug. 2016. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-846976

RESUMO

Introdução: descrever o tratamento endodôntico de incisivos inferiores com obliteração pulpar crônica (OPC) e periodontite apical após trauma dentário e tratamento ortodôntico prolongado. Relato de caso: paciente do sexo feminino, 22 anos de idade, procurou atendimento em uma clínica de Pós-graduação em Endodontia, relatando ter sofrido trauma dentário na região anteroinferior, seguido por tratamento ortodôntico por cinco anos. Dois nos após o nal do tratamento ortodôntico, lesões radiolúcidas associadas aos incisivos centrais inferiores foram observadas e o tratamento endodôntico foi iniciado por um clínico geral, sem sucesso na localização dos canais, devido à OPC. O tratamento endodôntico foi proposto e, com o auxílio de magni cação por microscopia óptica (25X), a localização dos canais foi feita. Movimentos de inserção, retração e rotação de 1/4 de volta nos sentidos horário e anti-horário com uma lima K #10 pré-curvada foram feitos até a patência apical. A intrumentação dos canais foi feita com a técnica do pré-alargamento e a medicação intracanal foi à base de pasta de hidróxido de cálcio, paramonoclorofenol e glicerina, por 15 dias, seguida pela obturação termoplasti cada e restauração com resina fotopolimerizável. Resultados: após 12 meses, a paciente não apresentou sinais e sintomas, e ocorreu o completo reparo das lesões perirradiculares dos incisivos centrais inferiores. Conclusão: a OPC causada pela associação do trauma dentário ao tratamento ortodôntico prolongado pode ter evoluído para a necrose pulpar e, consequentemente, para a periodontite apical. O protocolo de localização, exploração, limpeza, modelagem, medicação intracanal e preenchimento dos canais radiculares evitou as complicações por iatrogenia e permitiu o sucesso do caso.


Assuntos
Humanos , Feminino , Adulto , Instrumentos Odontológicos , Calcificações da Polpa Dentária , Cavidade Pulpar/lesões , Cavidade Pulpar/patologia , Endodontia , Traumatismos Dentários/complicações
12.
J Endod ; 41(12): 2031-5, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-26478439

RESUMO

INTRODUCTION: The aim of this study was to make a 3-dimensional comparison of the canal transportation and changes in apical geometry using micro-computed tomographic imaging after canal preparation with K3 (SybronEndo, Orange, CA) and K3XF (SybronEndo) file systems. METHODS: Twenty-eight mandibular molars were randomly divided into 2 groups according to the rotary system used in instrumentation: K3 or K3XF. The specimens were scanned by micro-computed tomographic imaging before and after instrumentation. Images before and after instrumentation from each group were compared with regard to canal volume, surface area, and structure model index (SMI) (paired t test, P < .05). After instrumentation, the canals from each group were compared regarding the changes in volume, surface area, SMI, and canal transportation in the last 4 apical mm (t test, P < .05). RESULTS: Instrumentation with the 2 rotary systems significantly changed the canal volume, surface area, and SMI (P < .05). There were no significant differences between instrument types concerning these parameters (P > .05). There were no significant differences between the 2 groups with regard to canal transportation in the last 4 apical mm (P > .05). CONCLUSIONS: Both rotary systems showed adequate canal preparations with reduced values of canal transportation. Heat treatment did not influence changes in root canal geometry in the apical region.


Assuntos
Ligas , Ligas Dentárias , Cavidade Pulpar/anatomia & histologia , Temperatura Alta , Preparo de Canal Radicular/instrumentação , Cavidade Pulpar/diagnóstico por imagem , Humanos , Mandíbula , Dente Molar/anatomia & histologia , Dente Molar/diagnóstico por imagem , Microtomografia por Raio-X
13.
Rev. bras. odontol ; 72(1/2): 100-103, Jan.-Jun. 2015.
Artigo em Português | LILACS-Express | LILACS | ID: lil-792068

RESUMO

A presente revisão de literatura tem como objetivo realizar uma breve introdução ao plasma, abordando o que é, como ele é gerado, seu mecanismo de ação, assim como seu uso na Odontologia, nas diferentes especialidades. Apesar de ainda não estar disponível rotineiramente para uso clínico, estudos mostram que o plasma, quando utilizado em temperatura ambiente, se mostra como uma inovação promissora apresentando atividade antimicrobiana, efeitos positivos em relação à adesão, clareamento dental e osteointegração, sem gerar danos ao tecido oral. Estes efeitos estão relacionados ao tempo de aplicação e ao gás utilizado.


This literature review aims to conduct a brief introduction to plasma, addressing what it is, how it is generated, its mechanism of action, as well as its use in dentistry, in different specialties. Although it is not yet routinely available for clinical use, studies have shown that the plasma, when used at room temperature, appears as a promising innovation featuring antimicrobial activity, positive effects in adhesiveness, tooth whitening and osseointegration, without causing oral tissue damage. These effects are related to application time and the gas used.

14.
Braz Oral Res ; 29(1): S1806-83242015000100308, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26892358

RESUMO

This study evaluated the ex vivoantimicrobial efficacy of the EndoVac system and the photodynamic therapy (PDT) associated with chemomechanical debridement (CMD) and intracanal medication on Candida albicans. Seventy-eight sterile premolars were contaminated withC. albicans (ATCC 21433) for 30 days. The teeth were randomly assigned into four groups: Control (CMD with conventional irrigation); Endovac (CMD with EndoVac system); PDT (CMD with conventional irrigation and PDT); and Endovac + PDT (CMD with EndoVac and PDT). After the therapies, intracanal dressing (calcium hydroxide) was applied to all teeth for seven days. Samples were obtained before (T1) and after the therapeutic procedures (T2), and after intracanal medication (T3), plated onto BHI agar and incubated (37°C, 48 h) to determine the colony-forming units (CFU)/mL. The overall mean level ofC. albicans at baseline was relatively high (1.85 x 106 ± 2.7 x 106 CFU mL-1). A significant reduction of C. albicans(p < 0.05) was observed over time (T1 to T2 and T1 to T3) in all groups. An additional significant reduction from T2 to T3 was observed only in the Endovac group (p < 0.05). No differences in mean reduction of C. albicans were observed among groups. However, the Endovac group presented the lowest mean counts of C. albicans at T3, whereas the PDT group had the highest counts of this microorganism (p < 0.05). The EndoVac system of irrigation/aspiration associated with CMD was the most effective therapeutic protocol for reducing intracanal levels of C. albicans. PDT showed a very limited efficacy against this species.


Assuntos
Candida albicans/efeitos dos fármacos , Cavidade Pulpar/microbiologia , Fotoquimioterapia/métodos , Irrigantes do Canal Radicular/farmacologia , Tratamento do Canal Radicular/métodos , Hidróxido de Cálcio/farmacologia , Contagem de Colônia Microbiana , Desbridamento/métodos , Cavidade Pulpar/efeitos dos fármacos , Desinfetantes/farmacologia , Humanos , Teste de Materiais , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Tratamento do Canal Radicular/instrumentação , Hipoclorito de Sódio/farmacologia , Estatísticas não Paramétricas , Fatores de Tempo , Resultado do Tratamento
15.
Braz. oral res. (Online) ; 29(1): 1-7, 2015. ilus
Artigo em Inglês | LILACS | ID: lil-777220

RESUMO

This study evaluated the ex vivoantimicrobial efficacy of the EndoVac system and the photodynamic therapy (PDT) associated with chemomechanical debridement (CMD) and intracanal medication on Candida albicans. Seventy-eight sterile premolars were contaminated withC. albicans (ATCC 21433) for 30 days. The teeth were randomly assigned into four groups: Control (CMD with conventional irrigation); Endovac (CMD with EndoVac system); PDT (CMD with conventional irrigation and PDT); and Endovac + PDT (CMD with EndoVac and PDT). After the therapies, intracanal dressing (calcium hydroxide) was applied to all teeth for seven days. Samples were obtained before (T1) and after the therapeutic procedures (T2), and after intracanal medication (T3), plated onto BHI agar and incubated (37°C, 48 h) to determine the colony-forming units (CFU)/mL. The overall mean level ofC. albicans at baseline was relatively high (1.85 x 106 ± 2.7 x 106 CFU mL-1). A significant reduction of C. albicans(p < 0.05) was observed over time (T1 to T2 and T1 to T3) in all groups. An additional significant reduction from T2 to T3 was observed only in the Endovac group (p < 0.05). No differences in mean reduction of C. albicans were observed among groups. However, the Endovac group presented the lowest mean counts of C. albicans at T3, whereas the PDT group had the highest counts of this microorganism (p < 0.05). The EndoVac system of irrigation/aspiration associated with CMD was the most effective therapeutic protocol for reducing intracanal levels of C. albicans. PDT showed a very limited efficacy against this species.


Assuntos
Humanos , Candida albicans/efeitos dos fármacos , Cavidade Pulpar/microbiologia , Fotoquimioterapia/métodos , Irrigantes do Canal Radicular/farmacologia , Tratamento do Canal Radicular/métodos , Contagem de Colônia Microbiana , Hidróxido de Cálcio/farmacologia , Desbridamento/métodos , Cavidade Pulpar/efeitos dos fármacos , Desinfetantes/farmacologia , Teste de Materiais , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Tratamento do Canal Radicular/instrumentação , Estatísticas não Paramétricas , Hipoclorito de Sódio/farmacologia , Fatores de Tempo , Resultado do Tratamento
16.
Rev. odontol. UNESP (Online) ; 41(5): 360-364, set.-out. 2012. ilus
Artigo em Português | LILACS-Express | LILACS | ID: lil-666266

RESUMO

INTRODUÇÃO: Uma fratura coronorradicular envolve esmalte, dentina e cemento, podendo ou não haver comprometimento pulpar. Vários tratamentos são propostos na literatura, desde a colagem do fragmento dental até a extrusão cirúrgica do fragmento remanescente. O presente trabalho descreve um caso de fratura coronorradicular com envolvimento pulpar e a abordagem multidisciplinar dada ao caso. DESCRIÇÃO DO CASO CLÍNICO: Paciente procurou tratamento odontológico por causa de um "dente quebrado". O tratamento realizado consistiu em um retalho mucoperiosteal para remoção dos fragmentos dentais, tratamento endodôntico, restauração provisória, extrusão ortodôntica, uma nova restauração e a proservação do caso. CONCLUSÃO: Em pacientes jovens, na região anterior, a extrusão ortodôntica acompanhada do tratamento restaurador é uma opção de tratamento conservador e estético.


INTRODUCTION: A crown-root fracture involves enamel, dentin and cementum. There may or may not be pulp involvement. Several treatments are proposed in the literature, going from a simple bond of dental fragments to surgical extrusion of the dental remaining fragments. The article describes a case of crown-root fracture with pulp involvement, and the multidisciplinary approach applied to the case. CASE REPORT: Patient required dental treatment due to a "broken tooth". The treatment consisted in a mucoperiosteal flap to remove dental fragments, endodontic treatment, temporary restoration, orthodontic extrusion, a new restoration, and the follow-up of the case. CONCLUSION: While treating the anterior teeth of young patients, the orthodontic extrusion accompanied by restorative treatment is the most conservative and aesthetic option of treatment.

17.
Microsc Res Tech ; 75(6): 791-5, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22298352

RESUMO

The aim of this study was to evaluate the effects of the 5.25% sodium hypochlorite (NaOCl), 2% chlorhexidine (CHX), and MTAD solutions on the surface of gutta-percha and Resilon cones by using atomic force microscopy (AFM). Accessory cones were washed and dried. The cones were randomly divided into six groups: gutta-percha immersed in NaOCl, CHX, and MTAD, and Resilon immersed in NaOCl, CHX, and MTAD. AFM images of the same area were made in different periods of time. JPK™ Image Processing Software was used to evaluate the images. The parameters used to evaluate the changes were RMS and line profiles. No statistically significant change was observed in the RMS values. The line profiles detected changes only for gutta-percha surfaces after immersion in NaOCl and MTAD solutions. In conclusion, 5.25% NaOCl and MTAD are associated with local changes in surface roughness of gutta-percha cones. No change was observed when 2% CHX was used. The use of all tested solutions did not produce any changes on Resilon surface.


Assuntos
Clorexidina/química , Ácido Cítrico/química , Desinfetantes/química , Doxiciclina/química , Guta-Percha/química , Polissorbatos/química , Materiais Restauradores do Canal Radicular/química , Hipoclorito de Sódio/química , Clorexidina/metabolismo , Ácido Cítrico/metabolismo , Desinfetantes/metabolismo , Doxiciclina/metabolismo , Guta-Percha/metabolismo , Microscopia de Força Atômica , Polissorbatos/metabolismo , Materiais Restauradores do Canal Radicular/metabolismo , Hipoclorito de Sódio/metabolismo , Soluções/química , Soluções/metabolismo , Propriedades de Superfície , Fatores de Tempo
18.
Dent. press endod ; 2(2): 42-46, 2012. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: lil-686403

RESUMO

Introdução: a presença de umidade no interior do sistema de canais radiculares, após o preparo biomecânico e sua desinfecção, é um dos fatores que podem influenciar no selamento a obturação endodôntica e, consequentemente,no êxito do tratamento endodôntico. Objetivos: avaliar a eficácia dos métodos de esterilização utilizados em cones de papel Cell Pack; se células parcialmente abertas, violadas,estavam contaminadas após determinado período de tempo; avaliar a efetividade do autoclave em esterilizar cones de papel contaminados e se a calibração dos cones de papel pode causar contaminação. Métodos: os cones de papel Cell Pack utilizados foram Dentsply, EndoPoints,Precise, Protaper, SybronEndo, VDW e Tanari. As avaliações foram realizadas de acordo com as proposições listadas anteriormente. Em todas as etapas, os cones de papel foram colocados em tubos contendo o meio BHI caldo(brain-heart infusion broth) e incubados a 37°C com uma atmosfera de CO2 por 7 dias. O BHI caldo foi checado diariamente para avaliação da turbidez do meio. Resultados:nenhum cone de papel removido diretamente das embalagens Cell Pack apresentou-se contaminado; no entanto, foi observada contaminação quando as embalagens estavam violadas. Após a esterilização, os cones de papel foram descontaminados e, finalmente, nenhuma contaminação foi encontrada nos cones de papel removidos com pinças estéreis e colocados sobre régua endodôntica esterilizada.Conclusão: os cones de papel presentes em embalagens Cell Pack são esterilizados e, após a abertura, a autoclavagem torna-se necessária e efetiva


Assuntos
Poluição Ambiental , Meios de Cultura , Endodontia , Teste de Materiais , Materiais Dentários/análise , Obturação do Canal Radicular/instrumentação , Preparo de Canal Radicular/instrumentação , Esterilização
19.
Artigo em Inglês | MEDLINE | ID: mdl-21458332

RESUMO

OBJECTIVES: The aim of this study was to evaluate the morphologic alterations on the surface of gutta-percha and Resilon cones exposed to disinfectant solutions. STUDY DESIGN: Fifty-six gutta-percha and Resilon cones were used. Seven groups were analyzed: G1: control; G2, G3, and G4: 5.25% NaOCl, 2% CHX, and MTAD, respectively, without final rinse; G5, G6, and G7: the same solutions with final rinse. Then the samples were analyzed by means of scanning electron microscopy and energy dispersive spectroscopy. RESULTS: Regarding the use of NaOCl without rinse, there was chloride crystal formation in all samples. When the cones were rinsed, the crystals were removed. When 2% chlorhexidine was used, no change was observed. MTAD without rinse showed the presence of a precipitate in gutta-percha cones. When the cones were rinsed, it was eliminated. CONCLUSIONS: The final rinse is essential, especially when NaOCl and MTAD are used in the cones' disinfection process.


Assuntos
Desinfecção/métodos , Guta-Percha/química , Materiais Restauradores do Canal Radicular/química , Irrigantes do Canal Radicular/química , Clorexidina/química , Ácido Cítrico/química , Doxiciclina/química , Humanos , Polissorbatos/química , Hipoclorito de Sódio/química , Propriedades de Superfície/efeitos dos fármacos
20.
J Endod ; 37(2): 255-8, 2011 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-21238813

RESUMO

INTRODUCTION: The smear layer adheres to dentinal surface, thus occluding the dentinal tubules. Because this layer disfavors the penetration of irrigant solutions and root canal fillings, it should be removed. The aim of this study was to compare the effectiveness of 37% phosphoric acid with that of 17% EDTA and 10% citric acid in the removal of smear layer. MATERIALS AND METHODS: Fifty-two maxillary single-rooted human canines were accessed and instrumented. Between each instrument used, the canals were irrigated with sodium hypochlorite. After instrumentation, the teeth were irrigated with distilled water and then divided into groups according to the time and substances employed. The substances used were 17% EDTA, 10% citric acid, and 37% phosphoric acid solution and gel. The experimental time periods were of 30 seconds, 1 minute, and 3 minutes. The samples were prepared and observed by means of scanning electron microscopy. Three photomicrographs (2,000×) were recorded for each sample regarding the apical, middle, and cervical thirds. A score system was used to evaluate the images. RESULTS: None of the substances analyzed in this study was effective for removing the smear layer at 30 seconds. In the 1-minute period, the phosphoric acid solution showed better results than the other substances evaluated. In the 3-minute period, all the substances worked well in the middle and cervical thirds although phosphoric acid solution showed excellent results even in the apical third. CONCLUSIONS: These findings point toward the possibility that phosphoric acid solution could be a promising agent for smear layer removal.


Assuntos
Cavidade Pulpar/ultraestrutura , Ácidos Fosfóricos/uso terapêutico , Irrigantes do Canal Radicular/uso terapêutico , Camada de Esfregaço , Irrigação Terapêutica/métodos , Ácido Cítrico/uso terapêutico , Dente Canino , Cavidade Pulpar/efeitos dos fármacos , Ácido Edético/uso terapêutico , Humanos , Maxila , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Fatores de Tempo
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