Evaluation of the Clinical Impact of ISO 4049 in Comparison with Miniflexural Test on Mechanical Performances of Resin Based Composite.

The aim of this study was to evaluate the effect of different specimens dimensions on the mechanical properties of a commercial microfilled resin composite by using a modified ISO 4049 standard protocol, that generally provides specimen dimensions of 25 mm length × 2 mm width × 2 mm height; these standard dimensions are not clinically realistic considering the teeth diameter and length average. Furthermore, the overlapping irradiations required lead to specimens that are not homogeneous with the presence of some flaws due to packaging steps. For this reason, a miniflexural test was employed in this work both to simulate clinically realistic dimensions and to concentrate fewer defects.

Ultrastructural observations on inflammatory angiogenesis in gastric carcinomas with massive neutrophil infiltration.

Neutrophils are traditionally thought of as terminal effectors of inflammatory reaction, but experimental studies suggest that they play a direct role in the inflammatory angiogenesis of tumors. Thus, further evidence in humans is required regarding the mechanisms by which neutrophils induce tumor angiogenesis. In this study, 4 cases of human gastric carcinomas with massive neutrophil infiltration were studied by light and electron microscopy, focusing on the inflammatory angiogenesis in the tumor stroma.

Microvascular changes in human gastric carcinomas with coagulative necrosis: an ultrastructural study.

Ultrastructural findings in three cases of gastric carcinoma with coagulative necrosis are reviewed with special emphasis on microvascular changes. Intratumoral microvasculature revealed more or less stabilized vessels. Some were characterized by a close association between pericytes and endothelial cells, whereas others showed laminated basement membrane, with a loose association between pericytes and endothelial cells.

A case of gastric adenocarcinoma associated with giant-cell phlebitis.

A 60-year-old male patient with advanced gastric adenocarcinoma was treated by subtotal gastrectomy with dissection of the regional lymph nodes. Microscopic examination of the tumour revealed tubular adenocarcinoma which invaded the muscularis propria. There was no evidence of metastatic carcinoma in the dissected lymph nodes (pT2N0Mx).