ABSTRACT
Abstract Objective To investigate the chemical interactions between a high-viscosity glass ionomer cement (GIC) (KetacTM Molar Easymix, 3M ESPE, Seefeld, Bavaria, Germany) and human dentin. It was also analyzed the dynamics of GIC setting mechanism based on the time intervals required for the GIC and the GIC mixed with dentin to achieve stability. Material and Methods Each constituent of GIC - powder (P) and liquid (L) - and powdered dentin (D), as well as the associations P+L, D+L, and P+L+D in the concentrations of 29%, 50%, 65%, 78%, 82%, and 92% of GIC were analyzed with Fourier transform infrared (FTIR) and Raman spectroscopy. Results New optical absorption bands and/or Raman bands, which were not present in P, L, or D, were observed in the associations. The concentrations of 29% and 50% of GIC showed higher interaction, revealing that the amount of dentin influences the formation of new optical absorption or scattering bands. FTIR bands showed that the setting time to achieve bond stability was longer for the high-viscosity GIC (38±7 min) than for the sample with 29% of GIC (28±4 min). Conclusions The analysis revealed the formation of new compounds or molecular rearrangements resulting from the chemical interactions between GIC and dentin. Moreover, this study provides an effective method to evaluate the dynamics of the setting mechanism of GICs.
Subject(s)
Humans , Dentin/drug effects , Dentin/chemistry , Glass Ionomer Cements/chemistry , Reference Values , Spectrum Analysis, Raman , Surface Properties , Time Factors , Viscosity , Materials Testing , Adhesiveness , Reproducibility of Results , Spectroscopy, Fourier Transform InfraredABSTRACT
Diastemas anteriores podem comprometer a harmonia do sorriso. Devido à multiplicidade de suas etiologias, a eleboração de um plano de tratamento individual é essencial para o sucesso do tratamento. Muitas alternativas têm sido propostas para a finalização de tratamentos ortodônticos na presença de diastemas múltiplos remanescentes em função da discrepância dentária de Bolton. Pretende-se, com este trabalho, enfatizar o tratamento interdisciplinar, ressaltando a importância da contribuição da Dentística na finalização de casos ortodônticos. O uso da resina composta na técnica direta é uma alternativa conservadora, previsível e reversível.
Subject(s)
Humans , Male , Adolescent , Composite Resins , Diastema , Malocclusion/diagnosis , Dental Restoration, Permanent , Esthetics, Dental , Orthodontics, Corrective , Patient Care TeamABSTRACT
Muitas alternativas têm sido propostas para a finalização de tratamentos ortodônticos na presença de diastemas múltiplos remanescentes em função da discrepância dentária de Bolton. Os autores apresentam um caso clínico de abordagem interdisciplinar, no qual, após a terapia ortodôntica, realizou-se um guia de silicone a partir do enceramento diagnóstico do modelo de gesso, que serviu como referência na orientação dos incrementos de resina composta realizada pela técnica direta. Pretende-se, com este trabalho, ressaltar a importância da contribuição da dentística restauradora na finalização de casos ortodônticos. O uso da resina composta na técnica direta mostrou ser uma alternativa conservadora, previsível e reversível.
Many alternatives have been proposed for the completion of orthodontic treatment in the presence of remaning diastemata according to the Bolton analysis. The aim of this work is to highlight the contribution of operative dentistry in the finishing of orthodontic cases and to present a interdisciplinary approach. After orthodontic treatment, a silicon index of the palatal and incisal surfaces was obtained on the wax-up cast which served as reference for the direct resin composite restorations. The use of the direct resin composite technique has shown to be a predictable and reversible conservative alternative.