RESUMEN
This in vitro study evaluated the effect of sodium bicarbonate and sodium ascorbate on the microtensile bond strength of an etch-and-rinse system to bleached bovine enamel. Sixty bovine enamel blocks (4x4 mm) were flattened and randomly allocated into 5 groups: G1 (negative control): without treatment; G2 (positive control): bleached with 35% hydrogen peroxide (HP); G3: bleached and stored for 7 days in artificial saliva before restorative procedures; G4: bleached and treated with 10% sodium bicarbonate solution for 5 min; G5: bleached and treated with 10% sodium ascorbate hydrogel for 15 min. HP gel was applied twice (20 min each, except in G1) and the adhesive restorations were performed. After 24 h, the specimens were sectioned into sticks and submitted to microtensile bond strength testing with a crosshead speed of 0.5 mm/min (n=12). As a complementary visual observation, the enamel surfaces of the G1 and G2 specimens were evaluated with scanning electron microscopy. Data were analyzed by one-way ANOVA (p<0.05). The means (standard deviation) were: G1: 24.22±7.74; G2: 18.29±5.88; G3: 40.88±7.95; G4: 19.95±5.67 and G5: 24.43±6.43. Adhesive failures were predominant in all groups. The comparison between the treatments indicates that waiting 7 days after bleaching is still the most effective approach. When this waiting period is not possible, application of sodium ascorbate or sodium bicarbonate seems to be a good alternative. Therefore, the practicality of obtaining sodium bicarbonate in the bleaching kits and its higher stability enables its clinical use.
Asunto(s)
Antioxidantes/farmacología , Esmalte Dental , Resistencia a la Tracción , Blanqueamiento de Dientes , Animales , BovinosRESUMEN
Abstract This in vitro study evaluated the effect of sodium bicarbonate and sodium ascorbate on the microtensile bond strength of an etch-and-rinse system to bleached bovine enamel. Sixty bovine enamel blocks (4x4 mm) were flattened and randomly allocated into 5 groups: G1 (negative control): without treatment; G2 (positive control): bleached with 35% hydrogen peroxide (HP); G3: bleached and stored for 7 days in artificial saliva before restorative procedures; G4: bleached and treated with 10% sodium bicarbonate solution for 5 min; G5: bleached and treated with 10% sodium ascorbate hydrogel for 15 min. HP gel was applied twice (20 min each, except in G1) and the adhesive restorations were performed. After 24 h, the specimens were sectioned into sticks and submitted to microtensile bond strength testing with a crosshead speed of 0.5 mm/min (n=12). As a complementary visual observation, the enamel surfaces of the G1 and G2 specimens were evaluated with scanning electron microscopy. Data were analyzed by one-way ANOVA (p<0.05). The means (standard deviation) were: G1: 24.22±7.74; G2: 18.29±5.88; G3: 40.88±7.95; G4: 19.95±5.67 and G5: 24.43±6.43. Adhesive failures were predominant in all groups. The comparison between the treatments indicates that waiting 7 days after bleaching is still the most effective approach. When this waiting period is not possible, application of sodium ascorbate or sodium bicarbonate seems to be a good alternative. Therefore, the practicality of obtaining sodium bicarbonate in the bleaching kits and its higher stability enables its clinical use.
Resumo Este estudo in vitro avaliou o efeito do bicarbonato de sódio e do ascorbato de sódio na resistência de união de um sistema adesivo convencional unido ao esmalte bovino clareado. Sessenta blocos de esmalte bovino (4x4 mm) foram planificados e distribuídos aleatoriamente em 5 grupos: G1: (controle negativo); G2 (controle positivo): clareamento com peróxido de hidrogênio 35% (HP); G3: clareamento com HP seguido de armazenamento por 7 dias em saliva artificial antes do procedimento restaurador; G4: clareamento com HP seguido de tratamento com a solução de bicarbonato de sódio 10% por 5 min; G5: clareamento com HP seguido de tratamento com hidrogel de ascorbato de sódio 10% por 15 min. O HP foi aplicado duas vezes (20 min cada, com exceção do grupo G1) e então as restaurações adesivas foram realizadas. Após 24 h, os espécimes foram seccionados em palitos e submetidos ao teste de resistência de união a uma velocidade de 0,5 mm/min (n=12). As superfícies de esmalte de G1 e G2 foram avaliadas com microscopia eletrônica de varredura para fins de análise visual complementar. Os dados foram analisados por ANOVA a um critério (p<0,05). As medias (desvio-padrão) foram: G1: 24,22±7,74; G2: 18,29±5,88; G3: 40,88±7,95; G4: 19,95±5,67 e G5: 24,43±6,43. Falhas adesivas foram predominantes em todos os grupos. A comparação entre os diferentes tratamentos indica que esperar 7 dias após o clareamento é ainda a abordagem mais eficaz. Nos casos em que este período de espera não é possível, a aplicação do ascorbato de sódio e do bicarbonate de sódio parecem ser boas alternativas. Entretanto, a praticidade na obtenção da solução de bicarbonato de sódio nos kits de clareamento e sua maior estabilidade favorecem o seu uso clínico.
Asunto(s)
Animales , Bovinos , Antioxidantes/farmacología , Esmalte Dental , Resistencia a la Tracción , Blanqueamiento de DientesRESUMEN
UNLABELLED: Development of new materials for tooth bleaching justifies the need for studies to evaluate the changes in the enamel surface caused by different bleaching protocols. OBJECTIVE: The aim of this study was to evaluate the bovine dental enamel wear in function of different bleaching gel protocols, acid etching and pH variation. MATERIAL AND METHODS: Sixty fragments of bovine teeth were cut, obtaining a control and test areas. In the test area, one half received etching followed by a bleaching gel application, and the other half, only the bleaching gel. The fragments were randomly divided into six groups (n=10), each one received one bleaching session with five hydrogen peroxide gel applications of 8 min, activated with hybrid light, diode laser/blue LED (HL) or diode laser/violet LED (VHL) (experimental): Control (C); 35% Total Blanc Office (TBO35HL); 35% Lase Peroxide Sensy (LPS35HL); 25% Lase Peroxide Sensy II (LPS25HL); 15% Lase Peroxide Lite (LPL15HL); and 10% hydrogen peroxide (experimental) (EXP10VHL). pH values were determined by a pHmeter at the initial and final time periods. Specimens were stored, subjected to simulated brushing cycles, and the superficial wear was determined (µm). ANOVA and Tukey´s tests were applied (α=0.05). RESULTS: The pH showed a slight decrease, except for Group LPL15HL. Group LPS25HL showed the highest degree of wear, with and without etching. CONCLUSION: There was a decrease from the initial to the final pH. Different bleaching gels were able to increase the surface wear values after simulated brushing. Acid etching before bleaching increased surface wear values in all groups.
Asunto(s)
Grabado Ácido Dental/métodos , Esmalte Dental/efectos de los fármacos , Blanqueadores Dentales/química , Blanqueamiento de Dientes/métodos , Desgaste de los Dientes/inducido químicamente , Análisis de Varianza , Animales , Bovinos , Geles , Peróxido de Hidrógeno/química , Concentración de Iones de Hidrógeno , Ensayo de Materiales , Distribución Aleatoria , Valores de Referencia , Propiedades de Superficie/efectos de los fármacos , Factores de Tiempo , Cepillado DentalRESUMEN
ABSTRACT Development of new materials for tooth bleaching justifies the need for studies to evaluate the changes in the enamel surface caused by different bleaching protocols. Objective The aim of this study was to evaluate the bovine dental enamel wear in function of different bleaching gel protocols, acid etching and pH variation. Material and Methods Sixty fragments of bovine teeth were cut, obtaining a control and test areas. In the test area, one half received etching followed by a bleaching gel application, and the other half, only the bleaching gel. The fragments were randomly divided into six groups (n=10), each one received one bleaching session with five hydrogen peroxide gel applications of 8 min, activated with hybrid light, diode laser/blue LED (HL) or diode laser/violet LED (VHL) (experimental): Control (C); 35% Total Blanc Office (TBO35HL); 35% Lase Peroxide Sensy (LPS35HL); 25% Lase Peroxide Sensy II (LPS25HL); 15% Lase Peroxide Lite (LPL15HL); and 10% hydrogen peroxide (experimental) (EXP10VHL). pH values were determined by a pHmeter at the initial and final time periods. Specimens were stored, subjected to simulated brushing cycles, and the superficial wear was determined (μm). ANOVA and Tukey´s tests were applied (α=0.05). Results The pH showed a slight decrease, except for Group LPL15HL. Group LPS25HL showed the highest degree of wear, with and without etching. Conclusion There was a decrease from the initial to the final pH. Different bleaching gels were able to increase the surface wear values after simulated brushing. Acid etching before bleaching increased surface wear values in all groups.
Asunto(s)
Animales , Bovinos , Blanqueamiento de Dientes/métodos , Grabado Ácido Dental/métodos , Esmalte Dental/efectos de los fármacos , Desgaste de los Dientes/inducido químicamente , Blanqueadores Dentales/química , Valores de Referencia , Propiedades de Superficie/efectos de los fármacos , Factores de Tiempo , Cepillado Dental , Ensayo de Materiales , Distribución Aleatoria , Análisis de Varianza , Geles , Concentración de Iones de Hidrógeno , Peróxido de Hidrógeno/químicaRESUMEN
The concepts introduced by the Minimally Invasive Dentistry (MID) allowed the rising of new conservative treatment and assessment system for caries lesions' classification. In this context, the approaches of the incipient caries lesions surpass the use of only traditional restorative techniques. The aim of this study was to review the new caries classifications criteria (ICDAS and CAST), the importance of the early diagnosis of caries lesions and the clinical procedures for treatment in MID.
Asunto(s)
Humanos , Masculino , Femenino , Factores Epidemiológicos , Caries Dental , Accesibilidad a los Servicios de SaludRESUMEN
The evolution of adhesive procedures and ceramic systems has allowed for the placement of minimum thickness laminate veneers on unprepared teeth. A 20-year-old post-orthodontics male patient with multiple diastemas required restorative procedures. A multidisciplinary approach was performed, involving gingivectomy, in-office bleaching, and application of minimum thickness veneers. The immediate and 1-year followup results exceeded expectations; however, long-term clinical trials are necessary to evaluate the performance of this new type of indirect restoration.
Asunto(s)
Coronas con Frente Estético , Estética Dental , Adulto , Cerámica , Estudios de Seguimiento , Humanos , Masculino , Blanqueamiento de Dientes , Adulto JovenRESUMEN
Objective: The aim of this case report is to present the 1-year follow-up of composite resin restorations performed on imediate bleached enamel. Clinical considerations: The presence of residual oxygen after bleaching may be responsible for inhibiting the polymerization of the monomers present in the adhesive systems, leading to the failure of the restorative procedure. The use of antioxidants, especially the 10% sodium bicarbonate solution (SB), could be a fast and practical alternative to improve the bond strength of these restorations. Patient with high aesthetic demands submitted to the office bleaching with hydrogen peroxide 35% received restorative procedure performed immediately after bleaching. After unsatisfactory resin composite restorations removal, the antioxidant SB was applied and the restorative procedure performed.After one year, the clinical performance of the restorations were successful, showing no signs of failure nor infiltration. Conclusions: The use of the 10% sodium bicarbonate in bleached enamel seems to be a viable alternative for clinical practice, however a large number of restorations of longitudinal researches will be need for corroborate this technique...
Objetivo: O objetivo desse relato de caso clínico é apresentar o acompanhamento de 1 ano de restaurações de resina composta realizadas em esmalte dentário recém-clareado. Considerações clínicas: A presença de oxigénio residual após o clareamento dentário pode ser responsável pela inibição da polimerização dos monômeros presentes nos sistemas adesivos, que pode acarretar em falha do processo restaurador. A utilização de antioxidantes, especialmente a solução de bicarbonato de sódio a 10% (SB), pode ser uma alternativa rápida e prática para melhorar a resistência de união destas restaurações. Em um paciente com alta exigência estética submetido ao clareamento de consultório com peróxido de hidrogénio a 35% foi realizado o procedimento restaurador imediatamente após o clareamento dentário. Após a remoção das restaurações insatisfatórias de resina composta, o antioxidante SB foi aplicado e o procedimento restaurador realizado imediatamente. Após um ano, o desempenho clínico das restaurações de resina composta foram adequadas, não mostrando sinais de falhas nem de infiltração marginal. Conclusões: O uso da solução de bicarbonato de sódio a 10% no esmalte clareado se mostrou uma alternativa viável e prática, contudo um maior número de estudos longitudinais é necessário afim de corroborar com a técnica utilizada neste caso clínico...