“Objective: The aim of this study was to compare the fit of ceramic crowns fabricated from conventional silicone impressions with the https://www.selleckchem.com/products/poziotinib-hm781-36b.html fit of ceramic crowns fabricated from intraoral digital impressions. Methods: Twenty-five participants with 30 posterior teeth with a prosthetic demand were selected for the study. Two crowns were made for each preparation. One crown was fabricated from an intraoral digital impression system
(IDI group) and the other crown was fabricated from a conventional two-step silicone impression (CI group). To replicate the interface between the crown and the preparation, each crown was cemented on its corresponding clinical preparation with ultra-flow silicone. Each crown was embedded in acrylic resin to stabilise the registered interface and then cut in 2 mm thick slices in a buco-lingual orientation. The internal gap was determined as the vertical distance from the internal surface of the crown to the prepared tooth surface at four points (marginal gap, www.selleckchem.com/products/jq1.html axial gap, crest gap, and occlusal fossa gap) using stereomicroscopy with a magnification of 40x. Data was analysed by using Wilcoxon signed rank test (alpha = 0.05). Results: Internal adaptation values were significantly affected by the impression technique (p = 0.001). Mean marginal gap was 76.33 +/- 65.32 mu m for the crowns
of the IDI group and 91.46 +/- 72.17 mu m for the CI group. Conclusion: All-ceramic crowns fabricated from intraoral digital impressions with wavefront sampling technology demonstrated better internal fit than crowns manufactured from silicone impressions. Clinical significance: Impressions obtained from an intraoral digital scanner based on wavefront sampling technology can Selleck A-1210477 be used for manufacturing ceramic crowns in the normal clinical practice with better results than conventional impressions with elastomers. (C) 2014 Elsevier Ltd. All
“Background/Aims: Keloids result from aberrations in the normal wound healing cascade and can lead to pruritus, contractures and pain. The underlying mechanisms of excessive scarring are not yet understood, and most therapeutic strategies remain unsatisfactory. Psoriasin (S100A7) and koebnerisin (S100A15) are released by keratinocytes during physiological wound healing. We found S100 production is markedly decreased in keloid scar tissue. The disturbed epidermal S100 expression might contribute to keloid formation; thus, we studied their effect on dermal fibroblasts and extracellular matrix (ECM) production. Methods: S100 peptides, ECM regulation and distribution were analysed in normal and keloid tissue by quantitative PCR (qPCR), immunoblotting and immunofluorescent staining. Isolated dermal fibroblasts were incubated with S100 proteins, and the regulation of ECM and transforming growth factor (TGF)-beta was determined using qPCR.