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Objectives: This study aimed to establish a single-session associative protocol for non-restorative management of dentin hypersensitivity (DH). Materials and Methods: Twenty-four individuals with DH and a minimum sensitivity level of 4 on the visual analog scale (VAS) were selected. The study was conducted in a split-mouth design, with each participant (n = 20) having at least 1 affected tooth in all quadrants. The management protocols consisted of control group: universal adhesive, Neural Desensitizing Protocol group: 5% potassium nitrate, Mixed Desensitizing Protocol (PAM) group: 5% sodium fluoride and 5% potassium nitrate, Remineralizing Desensitizing Protocol (PDR) group: surface-partially reacted glass technology photopolymerizable varnish. Evaluations were performed immediately after application, at 1 week, 1 month, 2 months, and 12 months using the VAS sensitivity test. Results: The scores were subjected to statistical analysis using the Friedman test (p < 0.05), Durbin-Conover test (p < 0.05), and Wilcoxon test (p < 0.05). At the 12-month evaluation, all groups showed statistically significant differences compared to the initial assessment. For the evaluation after 12 months, there was a statistically significant difference between the PAM group, the control group, and the PDR group. Conclusions: It can be concluded that all groups were effective in controlling DH, but there were significant results in the control group and PDR group. The clinical relevance of this study is to demonstrate that the application of single-session desensitizing protocols can be effective in controlling DH for up to 12 months. Trial Registration: Brazilian Clinical Trials Registry Identifier: RBR-4r63d7s.
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AIM AND OBJECTIVE: This study aimed to evaluate the effect of ozonated water used as an irrigant and dentin-cleaning solution on the bond strength of fiberglass pins in vitro, comparing it with the commonly used solutions. MATERIAL AND METHODS: Seventy-seven bovine roots were randomly divided into seven groups according to the irrigant and dentin-cleaning solution to be used: HP/HP, 2.5% sodium hypochlorite; DA/DA, distilled water; CHX/CHX, 2% chlorhexidine; OA/OA, 4 ppm ozonated water; HP/DA; HP/CHX; and HP/OA. In each group, the root canals were endodontically prepared by using the corresponding irrigant and stored in DA; after 7 days, they were cleared and cleaned with the corresponding cleaning solution. The fiberglass pins were cemented by using self-adhesive cement. After 7 days, the roots were sectioned (six discs each) and submitted to the push-out test. The type of fracture was analyzed with a 4.5x stereoscopic magnifying glass. The data were analyzed by the analysis of variance and the Tukey test at a 5% significance level. RESULTS: The OA/OA (11.67), HP/HP (11.21), and HP/OA (9.71) groups showed the highest mean push-out bond strength (MPa) in the cervical third. The same trend was maintained in the middle and apical thirds. CONCLUSION: Ozonated water and 2.5% sodium hypochlorite are the most relevant solutions for root dentin treatment. CLINICAL RELEVANCE: Teeth treated with ozonated water, sodium hypochlorite, and a combination of the two showed greater bond strength than those treated with other solutions.
Assuntos
Colagem Dentária , Técnica para Retentor Intrarradicular , Animais , Bovinos , Cavidade Pulpar , Dentina , Vidro , Teste de Materiais , Cimentos de Resina , Irrigantes do Canal Radicular , ÁguaRESUMO
Objetivo: Avaliar a influência de diferentes soluções de irrigação cavitária sobre a resistência de união de um cimento resinoso de dupla polimerização. Material e Método: A partir de incisivos bovinos, foram obtidos 4 grupos (n=15), divididos aleatoriamente de acordo com a solução irrigadora empregada na limpeza cavitária, sendo: G0 - soro fisiológico + condicionamento ácido; G1 EDTA + condicionamento ácido; G2 - Clorexidina 2% + condicionamento ácido + clorexidina 2% e G3 - soro fisiológico + condicionamento ácido + clorexidina 2%. Foram confeccionados cilindros de cimento resinoso para cada coroa, utilizando-se uma matriz de Tygon com diâmetro interno de 1 mm e altura de 2 mm. O teste de resistência adesiva por microcisalhamento foi realizado após 3 meses de armazenamento dos espécimes em soro fisiológico a 37ºC. Os dados foram submetidos ao teste de Kruskall-Wallis, seguido do teste de Dunn (p<0,05). Resultados: Os grupos G0, G1 e G3 não apresentaram diferenças significativas entre si (p>0,05). Os menores valores foram observados no grupo G2 (p<0,05). Conclusões: As soluções irrigadoras EDTA e soro fisiológico utilizadas previamente ao condicionamento ácido da dentina não interferiram, significativamente, na resistência de união, porém, a solução de clorexidina utilizada após o condicionamento ácido influenciou negativamente nos valores de resistência de união.
Objectives: This study aimed to evaluate the influence of different cavity irrigation solutions on the bond strength of a dual-curing resin cement. Methods: From bovine incisors, 4 groups (n=15), were randomly divided according to the irrigating solution for cavity cleaning: G0 saline + acid etching; G1 EDTA + acid etching; G2: Chlorhexidine 2% + acid etching + Chlorhexidine 2%; and G3 Saline + acid etching + Chlorhexidine 2%. Resin cement cylinders were made for each crown, using a Tygon matrix with internal diameter of 1 mm and height of 2 mm. The specimens were stored for 3 months at 37oC, and then subjected to microshear tests. Data were statistically analyzed by Kruskal-Wallis test followed by Dunn (p<0.05). Results: There were no statistically significant differences between G0, G1 and G3 groups (p>0.05). The lowest values were observed in G2 group (p<0.05). Conclusion: The irrigation solutions EDTA and saline used before to the acid etching of dentin did not interfere, significantly, in the bond strength, however, the solution of chlorhexidine used after the acid etching influenced negatively.
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Introdução: A contaminação do substrato dentinário pode interferir na qualidade de união entre materiais adesivos e o dente. Objetivo: Investigar a influência de diferentes soluções de irrigação na resistência de união de um cimento resinoso. Material e Método: Foram selecionadas 40 coroas dentais bovinas, divididas em quatro grupos: G0 = soro; G1 = clorexidina; G2 = EDTA; G3 = clorexidina 0,12%, após condicionamento ácido. Em seguida, foram confeccionados cilindros de cimento resinoso utilizando-se uma matriz de Tygon com diâmetro interno de 1 mm e 2 mm de altura. A fotoativação foi realizada por aparelho de luz LED com 900 mW/cm² por 40 segundos. Foram confeccionados quatro cilindros de cimento resinoso para cada coroa bovina, totalizando 40 corpos de prova de cimento resinoso para cada grupo avaliado. O teste de resistência adesiva por microcisalhamento foi realizado após 24 horas. Decorrido esse período, os cilindros de cimento resinoso foram testados em uma máquina universal de ensaios (EMIC). Os dados obtidos foram submetidos à análise estatística pelos testes ANOVA e Tukey (p = 0,001). Resultado: Não houve diferenças estatisticamente significativas entre os grupos estudados, com exceção para o G3, que apresentou de forma significativa os menores valores de resistência adesiva. Conclusão: As diferentes soluções irrigadoras utilizadas previamente ao condicionamento ácido na dentina não interferem na resistência de união por microcisalhamento.
Introduction: The contamination of dentin can interfere with the quality of union between adhesives and tooth. Objective: Was to investigate the influence of different irrigation solutions on bond strength of a resin cement. Material and Method: Were selected 40 dental bovine crowns divided into four groups: G0= physiologic serum, G1= chlorhexidine, G2= EDTA, G3= 0.12% chlorhexidine after acid etching. Then the cylinders were fabricated resin cement using a matrix of Tygon with an internal diameter of 1mm and 2mm in height. The polymerization was carried out by LED light unit with 900 mW/cm² for 40 seconds. 4 cylinders were made of resin cement for each bovine crown, totaling 40 body-of-proof resin cement for each group evaluated. The test microshear bond strength was performed after 24 hours. After this period, the resin cement cylinders were tested in a universal testing machine (EMIC). Data were statistically analyzed by ANOVA and Tukey (p = 0.001). Result: There were no statistically significant differences between groups, except for the G3 which showed significantly lower values of bond strength. Conclusion: The different irrigating solutions used prior to etching dentin not interfere in the bond strength microshear.
Assuntos
Animais , Bovinos , Análise de Variância , Adesivos Dentinários , Cimentos de Resina , Resistência ao Cisalhamento , Detergentes , Lâmpadas de Polimerização Dentária , Condicionamento Ácido do Dente , Clorexidina , SoroRESUMO
Direct composite resin restorations have become a viable alternative for patients that require anterior restorative procedures to be integrated to the other teeth that compose the smile, especially for presenting satisfactory esthetic results and minimum wear of the dental structure. Technological evolution along with a better understanding of the behavior of dental tissues to light incidence has allowed the development of new composite resins with better mechanical and optical properties, making possible a more artistic approach for anterior restorations. The combination of the increasing demand of patients for esthetics and the capacity to preserve the dental structure resulted in the development of different incremental techniques for restoring fractured anterior teeth in a natural way. In order to achieve esthetic excellence, dentists should understand and apply artistic and scientific principles when choosing color of restorative materials, as well as during the insertion of the composite resin. The discussion of these strategies will be divided into two papers. In this paper, the criteria for color and material selection to obtain a natural reproduction of the lost dental structures and an imperceptible restoration will be addressed.
Assuntos
Resinas Compostas/química , Restauração Dentária Permanente/métodos , Estética Dentária , Pigmentação em Prótese/métodos , Cor , Esmalte Dentário/anatomia & histologia , Dentina/anatomia & histologia , Humanos , Reprodutibilidade dos Testes , Resultado do TratamentoRESUMO
Direct composite resin restorations have become a viable alternative for patients that require anterior restorative procedures to be integrated to the other teeth that compose the smile, especially for presenting satisfactory esthetic results and minimum wear of the dental structure. Technological evolution along with a better understanding of the behavior of dental tissues to light incidence has allowed the development of new composite resins with better mechanical and optical properties, making possible a more artistic approach for anterior restorations. The combination of the increasing demand of patients for esthetics and the capacity to preserve the dental structure resulted in the development of different incremental techniques for restoring fractured anterior teeth in a natural way. In order to achieve esthetic excellence, dentists should understand and apply artistic and scientific principles when choosing color of restorative materials, as well as during the insertion of the composite resin. The discussion of these strategies will be divided into two papers. In this paper, the criteria for color and material selection to obtain a natural reproduction of the lost dental structures and an imperceptible restoration will be addressed.
Assuntos
Humanos , Resinas Compostas/química , Restauração Dentária Permanente/métodos , Estética Dentária , Pigmentação em Prótese/métodos , Cor , Esmalte Dentário/anatomia & histologia , Dentina/anatomia & histologia , Reprodutibilidade dos Testes , Resultado do TratamentoRESUMO
To evaluate the surface roughness of the resin Filtek Z350 (3M ESPE) after different finishing and polishing techniques. Methods: Sixty specimens of 7x2 mm were made and distributed in 6 groups (n=10), according to the technique employed: G1 (control) polyester strip no finishing or polishing; G2- multi-blade burs; G3- diamond burs 3195F and 3195FF; G4- Diamond ProDiscs (FGM); G5- Sof-Lex Discs (3M ESPE); G6- Robinson bristle brushes with pumice paste for20 s and felt disc with 2-4 ìm diamond paste for 30 s. The specimens were stored in artificial saliva at 37°C for 7 days. After the finishing and polishing techniques, surface roughness (Ra, ìm) was measured using Surf-Corder profilometer SE 1700. Data were subjected to one-way ANOVA andTukeys test at 5% significance level. Results: G3 presented the highest surface roughness meanvalue (0.61). G5 presented the lowest surface roughness mean value (0.15), but it was not significantly different from G1, G4 and G6. Conclusions: According to the obtained results, Z350 composite resin presented the lowest surface roughness when finishing and polishing systems were used (Sof-lex and Diamond Pro discs and Robinson bristle brush with pumice plus Diamond®felt disc with Diamond Excel® paste). The use of diamond burs (G3) resulted in the highest composite surface roughness. There was no significantly different between G1, G4, G5 and G6.
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Resinas Compostas , Polimento Dentário , NanotecnologiaRESUMO
UNLABELLED: Dentin adhesion procedure presents limitations, especially regarding to lifetime stability of formed hybrid layer. Alternative procedures have been studied in order to improve adhesion to dentin. OBJECTIVE: The aim of this study was to evaluate in vitro the influence of deproteinization or dentin tubular occlusion, as well as the combination of both techniques, on microtensile bond strength (microTBS) and marginal microleakage of composite resin restorations. MATERIAL AND METHODS: Extracted erupted human third molars were randomly divided into 4 groups. Dentin surfaces were treated with one of the following procedures: (A) 35% phosphoric acid gel (PA) + adhesive system (AS); (B) PA + 10% NaOCl + AS; (C) PA + oxalate + AS and (D) PA + oxalate + 10% NaOCl + AS. Bond strength data were analyzed statistically by two-way ANOVA and Tukey's test. The microleakage scores were analyzed using Kruskal-Wallis and Mann-Whitney non-parametric tests. Significance level was set at 0.05 for all analyses. RESULTS: microTBS data presented statistically lower values for groups D and B, ranking data as A>C>B>D. The use of oxalic acid resulted in microleakage reduction along the tooth/restoration interface, being significant when used alone. On the other hand, the use of 10% NaOCl alone or in combination with oxalic acid, resulted in increased microleakage. CONCLUSIONS: Dentin deproteinization with 10% NaOCl or in combination with oxalate significantly compromised both the adhesive bond strength and the microleakage at interface. Tubular occlusion prior to adhesive system application seems to be a useful technique to reduce marginal microleakage.
Assuntos
Resinas Compostas/química , Colagem Dentária , Infiltração Dentária/classificação , Adaptação Marginal Dentária , Materiais Dentários/química , Dentina/ultraestrutura , Condicionamento Ácido do Dente , Bis-Fenol A-Glicidil Metacrilato/química , Corantes , Preparo da Cavidade Dentária , Adesivos Dentinários/química , Humanos , Azul de Metileno , Oxalatos/química , Oxidantes/química , Ácidos Fosfóricos/química , Dióxido de Silício/química , Camada de Esfregaço , Hipoclorito de Sódio/química , Estresse Mecânico , Temperatura , Resistência à Tração , Fatores de Tempo , Água/química , Zircônio/químicaRESUMO
Dentin adhesion procedure presents limitations, especially regarding to lifetime stability of formed hybrid layer. Alternative procedures have been studied in order to improve adhesion to dentin. OBJECTIVE: The aim of this study was to evaluate in vitro the influence of deproteinization or dentin tubular occlusion, as well as the combination of both techniques, on microtensile bond strength (µTBS) and marginal microleakage of composite resin restorations. MATERIAL AND METHODS: Extracted erupted human third molars were randomly divided into 4 groups. Dentin surfaces were treated with one of the following procedures: (A) 35 percent phosphoric acid gel (PA) + adhesive system (AS); (B) PA + 10 percent NaOCl + AS; (C) PA + oxalate + AS and (D) PA + oxalate + 10 percent NaOCl + AS. Bond strength data were analyzed statistically by two-way ANOVA and Tukey's test. The microleakage scores were analyzed using Kruskal-Wallis and Mann-Whitney non-parametric tests. Significance level was set at 0.05 for all analyses. RESULTS: µTBS data presented statistically lower values for groups D and B, ranking data as A>C>B>D. The use of oxalic acid resulted in microleakage reduction along the tooth/restoration interface, being significant when used alone. On the other hand, the use of 10 percent NaOCl alone or in combination with oxalic acid, resulted in increased microleakage. CONCLUSIONS: Dentin deproteinization with 10 percent NaOCl or in combination with oxalate significantly compromised both the adhesive bond strength and the microleakage at interface. Tubular occlusion prior to adhesive system application seems to be a useful technique to reduce marginal microleakage.
Assuntos
Humanos , Resinas Compostas/química , Colagem Dentária , Adaptação Marginal Dentária , Infiltração Dentária/classificação , Materiais Dentários/química , Dentina/ultraestrutura , Condicionamento Ácido do Dente , Bis-Fenol A-Glicidil Metacrilato/química , Corantes , Preparo da Cavidade Dentária , Adesivos Dentinários/química , Azul de Metileno , Oxalatos/química , Oxidantes/química , Ácidos Fosfóricos/química , Camada de Esfregaço , Estresse Mecânico , Dióxido de Silício/química , Hipoclorito de Sódio/química , Temperatura , Resistência à Tração , Fatores de Tempo , Água/química , Zircônio/químicaRESUMO
A preservação e a restauração de dentes despolpados severamente debilitados é um procedimento complexo e relativamente imprevisível. Este estudo avaliou a resistência à fratura de raízes bovinas experimentalmente debilitadas, reconstruídas internamente com diferentes materiais restauradores em combinação com pinos pré-fabricados de fibra de vidro comparados com raízes íntegras restauradas com núcleo metálico fundido ou pino de fibra de vidro. Foram selecionadas raízes de 120 (n=15) incisivos bovinos inferiores de dimensões semelhantes, dos quais, 90 foram internamente preparados para simular uma raiz debilitada. Todas as raízes foram preenchidas com diferentes materiais restauradores e os espécimes foram submetidos ao teste de resistência ao fracasso/ fratura com a aplicação de uma carga compressiva tangencial a um ângulo de 135º em relação ao longo eixo axial das raízes. Resultados indicaram diferenças estatisticamente significante entre os grupos. As raízes debilitadas restauradas com núcleo metálico fundido (grupo NMF-RD) demonstraram os mais baixos valores de resistência à fratura (107.7436 N), sendo estatisticamente diferentes dos demais grupos. As raízes íntegras restauradas com núcleo metálico fundido (NMF-RI) mostraram os maiores valores de resistência (362.3308 N), mas com diferenças estatisticamente significantes somente quando comparadas às raízes debilitadas restauradas com cimento resinoso dual (Variolink II, Ivoclar Vivadent grupo Vario-RD), cimento resinoso autopolimerizável (Multilink, Ivoclar Vivadent grupo Multi-RD) e cimento de ionômero de vidro modificado por resina (Vitremer, 3M ESPE grupo Vitre-RD) associado com pino de fibra de vidro. Não houve diferença estatisticamente significante entre os grupos das raízes debilitadas restauradas com cimento resinoso auto-adesivo (RelyX Unicem, 3M ESPE grupo Unicem-RD), resina composta (Tetric Ceram, Ivoclar Vivadent grupo Tetric-RD), grupo Vitre-RD e...
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Técnica para Retentor Intrarradicular , Materiais Restauradores do Canal Radicular , Raiz Dentária , Dente não VitalRESUMO
A finalidade deste estudo foi verificar a capacidade de osseoindução do complexo BMP, em 6 coelhos brancos (New Zealand) que foram divididos em 2 grupos: grupo de enxerto de osso autógeno e grupo de BMP. Foram utilizados um total de 12 implantes de titânio puro, 2 em cada metáfise proximal da tíbia esquerda. Foram confeccionados defeitos ósseos de 2,5 x 4mm expondo as roscas dos implantes, que foram preenchidos com os 2 tipos de materiais estudados (osso autógeno e BMP). Os animais foram sacrificados 42 dias após a implantação e os espécimes foram processados para análise histológica. A substituição do material de enxerto e a neoformação óssea foram observadas em ambos os grupos. Concluiu-se que tanto o enxerto ósseo autógeno como o complexo BMP apresentam muito bom comportamento biológico, induzindo a neoformação óssea ao redor do implante.
The aim of this study was to verify the capacity of osseoinduction of the 6 white rabbits BMP complex (New Zealand) that were divided in 2 groups: group graft of autogenous bone and group of BMP. It was used a total of 12 implants of pure titanium, 2 in each proximal metaphysis of the left tibia. It was confectioned bone defects of 2.5 x 4mm exposing the threads of the implants, which were filled with the two types of the materials studied (autogenous bone and BMP). The animals were sacrificed after 42 days of the implantation, and the specimens were processed to histologic analysis. After 42 days substitution of the grafted material and bone neoformation were observed in both groups. It was concluded that both autogenous bone graft and BMP complex present a very good biological behavior, inducing bone neoformation around the implants.
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Animais , Coelhos , Proteínas Morfogenéticas Ósseas , Regeneração Óssea , Transplante Ósseo , Materiais Biocompatíveis , Próteses e Implantes , Titânio , Transplante AutólogoRESUMO
A resolução estética dos mais variados tipos de alterações de cor do elemento dental representa um grande desafio para o cirurgião-dentista. Pelo correto diagnóstico da alteração de cor, o profissional pode decidir qual o melhor método de tratamento ou optar pela associação de dife»rentes métodos de tratamento. Para a resolução dos manchamentos provocados pela fluorose dental, diferentes ácidos em diferentes con»centrações associados a abrasivos vêm sendo utilizados em variadas técnicas conhecidas como microabrasão do esmalte dental. No caso clínico apresentado, realizou-se a técnica de microabrasão sempre em»pregando ácido fosfórico 37 por cento e pedra-pomes, e posterior associação com o clareamento dental, para solucionar a desarmonia de cor existente nos dentes acometidos por fluorose.