Laser and LED phototherapies accelerate tissue repair. Mast cells induce the proliferation of fibroblasts and the development of local fibrosis. Increased numbers of myofibroblasts and mast cells are frequently found together in a normal wound repair, suggesting that mediators produced by the mast cells could play a role in the regulation of myofibroblast differentiation and function. The aim of this study was to analyze the involvement of mast cells on the synthesis of collagen and their influence on myofibroblast differentiation in the late phase of tissue repair on wounds treated with LLLT (λ 660 nm, 10 J/cm(2), 40 mW, 252 s) or LED (λ 630 ± 10 nm, 10 J/cm(2), 115 mW, 87 s). A 1 × 1-cm surgical wound was created on the dorsum of 30 rats divided into three groups of ten animals each: control, laser, and LED. The animals of each group were irradiated and sacrificed 7 and 14 days after injury. The statistical analysis was performed using the Mann-Whitney and Spearman correlation tests. Laser light improved the collagen deposition rate along the time points (p = 0.22), but when compared to the control groups during the periods studied, the number of mast cells decreased significantly (p ≤ 0.05). With respect to myofibroblasts, the results showed a trend to their reduction. No statistical significances were observed for LED light according to the parameters used in this study. It is concluded that the mast cell and myofibroblast population might participate in the collagen formation of irradiated wounds particularly in relation to laser phototherapy.

The use of ceramic restorations is constantly indicated and used in dental clinics because of their structural and aesthetic qualities, however despite being a material with excellent mechanical properties it may present fractures. The complete replacement of a prosthetic restoration has an elevated cost and needs a longer clinical time. So the repair of ceramics using composite resin has been a good alternative in cases of fracture. The objective of this study is to evaluate through a literature review the influence of acid etching in the repair of ceramic with composite resin. The data collection was performed through the selection of articles published in the databases SciELO, LILACS and Bireme using the following descriptors: surface treatment, composite resin and dental ceramics. According to the findings gathered, the repair of fractured ceramic surface can be performed intra-orally through the mechanical and chemical treatment of the fractured surface. For acid sensitive ceramics it is reported in literature the effectiveness of hydrofluoric acid treatment in promoting superficial alterations, however, the longevity of such adhesion between ceramic and composite resin after etching is still questionable.

Occlusal wear did not caused morphologic alterations in the masseter muscle but resulted in changes of the levels of CaP(i) that were less compromising when the laser light was used.

ResumoO uso das restaurações cerâmicas é constantemente indicado e utilizado nos consultórios odontológicos devido as suas qualidades estéticas e estruturais, no entanto mesmo sendo um material com excelentes propriedades mecânicas podem apresentar fraturas. A substituição total da peça protética tem custo elevado, e necessita de bastante tempo clínico. Assim, o reparo das cerâmicas utilizando resina composta fotopolimerizável tem sido uma boa alternativa em casos de fratura. O objetivo desse trabalho é avaliar, por meio de uma revisão de literatura, a influência do condicionamento ácido no reparo de cerâmicas com resina composta. A coleta de dados foi realizada através da seleção de artigos publicados nas bases de dados Scielo, LILACS e Bireme, utilizando os seguintes descritores: tratamento de superfície, resina composta e cerâmicas odontológicas. De acordo com os achados pesquisados, o reparo da superfície cerâmica fraturada pode ser realizado intra-oralmente através do tratamento mecânico e químico da superfície fraturada. Para cerâmicas ácido sensíveis é relatado na literatura a efetividade do condicionamento com ácido fluorídrico na promoção de alteração superficial, no entanto, a longevidade desta adesão entre cerâmica e resina composta após o condicionamento ácido ainda é questionável.Palavras-chave: Cerâmica; Resistência à tração; Ácido fluorídrico.

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