Résumé
Abstract This study evaluated the effect of aging and cementation of fiber posts using glass ionomer and resin cements on push-out bond strength, failure mode, and resin tag formation. One hundred and twenty bovine incisors were used. After post-space preparation, the specimens were randomly allocated into 12 groups (n = 10) according to the cementation system used: GC - GC Gold Label Luting & Lining); RL - RelyX Luting 2; MC - MaxCem Elite; RU - RelyX U200 and the aging periods (24 hours, 6 months, and 12 months). Slices from the cervical, middle, and apical thirds were obtained and analyzed by push-out bond strength test and confocal laser scanning microscopy. One-way ANOVA and Tukey's post-hoc test was used at a significance level of 5%. For the push-out bond strength test, no differences among GC, RU, and MC in the cervical and middle thirds were observed, regardless of the period of storage (P > 0.05). In the apical third, GC and RU showed similar bond strength but higher than other groups (P > 0.05). After 12 months, GC showed the highest bond strength (P < 0.05). Bond strength to post-space dentin decreased over time, regardless of the cementation system used. Cohesive failure was the most frequent, regardless of the period of storage, cementation system, and post-space third. Tag formation was similar among all groups. After 12 months, GC showed the highest bond strength values.
Resumo Avaliar o efeito do envelhecimento e sistemas de cimentação usando ionômero de vidro e cimentos resinosos na resistência de união à dentina após a cimentação do pino de fibra. Cento e vinte incisivos bovinos foram utilizados. Após o preparo do pós-espaço, os corpos de prova foram distribuídos aleatoriamente em 12 grupos (n = 10) de acordo com o período de envelhecimento (24 horas, 6 meses e 12 meses) e o sistema de cimentação utilizado: GC - cimento de ionômero de vidro (GC Gold Label Cimentação e Revestimento); RL - RelyX Luting 2; MC - MaxCem Elite; RU - RelyX U200. Cortes dos terços cervical, médio e apical foram obtidos e analisados por teste de resistência de união push-out e microscopia confocal de varredura a laser. ANOVA one-way e teste de Tukey foi usado a um nível de significância de 5%. Para o teste de resistência de união, não foram observadas diferenças entre GC, RU e MC nos terços cervical e médio, independentemente do período de armazenamento (P > 0,05). No terço apical, GC e RU apresentaram resistência de união semelhante, porém superior aos demais grupos (P > 0,05). Após 12 meses, o GC apresentou a maior resistência de união (P < 0,05). A resistência de união à dentina no espaço para pino diminuiu ao longo do tempo, independentemente do sistema de cimentação utilizado. A formação de tags foi semelhante entre todos os grupos. Após 12 meses, o GC apresentou os maiores valores de resistência de união.
Résumé
Aim To evaluate the flow, pH and calcium release of white MTA (WMTA), salicylate-based resin root canal sealer (Sealapex; SEAL) and SEAL containing 10 (SE10) or 20% (SE20) (w/w) of MTA. Methodology Flow test was realized according to ISO 6876 specification. The sealers samples (n= 10) were placed in polyethylene tubes and immersed in deionized water. After 24 hours and 7, 14, and 28 days, the water pH was determined with a pH meter, and calcium release was assessed by atomic absorption spectrophotometry. Results SEAL and WMTA showed respectively the highest and lowest flow rate when compared with the other materials (P<0.05). SE20 showed the highest pH value only in 24h and 7 days periods (p<0.05). In 14- and 28-days periods, SEAL showed the lowest pH value (p<0.05), but there are no differences between other groups (p>0.05). In all periods, WMTA and SEAL respectively showed the highest and lowest calcium release (p<0.05). Conclusions SE20 proves to be an association with better flow and handling than WMTA, with satisfactory potential for alkalinization and calcium release.
Résumé
Existem técnicas amplamente utilizadas na atualidade e diversos tipos de substâncias clareadoras em diferentes formas de apresentação que podem implicar no procedimento quando se é executado podendo trazer benefícios e/ou malefícios. O objetivo deste estudo foi realizar uma revisão integrativa da literatura acercar dos benefícios e/ou malefícios existente durante o processo de clareamento dental, nas bases de dados Lilacs e Pubmed, utilizando os descritores "Clareamento Dental"; "Odontologia baseada em evidências" e "Estética Dentária". Os critérios de inclusão foram artigos completos, nas línguas inglesa e portuguesa, indexados no período de 2010 a 2020. Após os artigos serem filtrados, 5.929 foram encontrados, e a partir destes, 9 artigos apresentaram informações que estavam relacionados com a temática a ser proposta. A partir da analise ficou explicito que a realização de um procedimento consciente de todas as etapas, com conhecimento da técnica e indicação é necessária para que se tenha sucesso(AU)
There are techniques used today and several types of whitening substances in different forms of presentation that may involve the procedure when it is possible to bring benefits and / or harms. The aim of this study was to carry out an integrative literature review about the benefits and / or harms that exist during the tooth whitening process, in the Lilacs and Pubmed databases, using the descriptors "Dental Whitening"; "Evidence-based dentistry" and "Dental Aesthetics". The inclusion criteria were complete articles, in English and Portuguese, indexed in the period from 2010 to 2020. After the articles were filtered, 5,929 were found, and from these, 9 articles presented information that was related to the theme to be proposed. From the analysis it was made explicit that the performance of a conscious procedure of all stages, with knowledge of the technique and indication is necessary for success(AU)