507 research outputs found
Current diagnostic strategies for undifferentiated tumours of the nasal cavities and paranasal sinuses.
Contribution of Raman Spectroscopy to Diagnosis and Grading of Chondrogenic Tumors
In the last decade, Raman Spectroscopy has demonstrated to be a label-free and non-destructive optical spectroscopy able to improve diagnostic accuracy in cancer diagnosis. This is because Raman spectroscopic measurements can reveal a deep molecular understanding of the biochemical changes in cancer tissues in comparison with non-cancer tissues. In this pilot study, we apply Raman spectroscopy imaging to the diagnosis and grading of chondrogenic tumors, including enchondroma and chondrosarcomas of increasing histologic grades. The investigation included the analysis of areas of 50×50 μm2 to approximately 200×200 μm2, respectively. Multivariate statistical analysis, based on unsupervised (Principal Analysis Components) and supervised (Linear Discriminant Analysis) methods, differentiated between the various tumor samples, between cells and extracellular matrix, and between collagen and non-collagenous components. The results dealt out basic biochemical information on tumor progression giving the possibility to grade with certainty the malignant cartilaginous tumors under investigation. The basic processes revealed by Raman Spectroscopy are the progressive degrading of collagen type-II components, the formation of calcifications and the cell proliferation in tissues ranging from enchondroma to chondrosarcomas. This study highlights that Raman spectroscopy is particularly effective when cartilaginous tumors need to be subjected to histopathological analysis
VULVAR HISTOPATHOLOGICAL AND IMMUNOHISTOCHEMICAL CHANGES IN PATIENTS WITH PRIMARY SJÖGREN SYNDROME
Background: Primary Sjogren Syndrome (pSS) is an autoimmune disease mostly affecting women, characterized by a
lymphocyte-mediated infiltration and destruction of several exocrine glands, which causes mucosal dryness. Genital
involvement is frequent and characterized by vulvar and vaginal dryness, dyspareunia and pruritus, that significantly
impairs sexual function. However, despite the high frequency of genital involvement, few data were published about the
histopathology of external genitalia in pSS. The studies performed until now show that vaginal and vulvar dryness are
due to the presence of a vulvar inflammatory infiltrate and to the atrophy of minor and major vestibular glands, whose
secretions are important for the sexual function.
Objectives: To evaluate the presence and the characteristics of histopathological and immunohistochemical changes in
vulvar tissues in women with pSS.
Methods: Women with pSS (21 patients) underwent vulvar biopsies that have been evaluated for histopathological and
immunohistochemical changes and finally compared with those obtained from 26 patients with lichen sclerosus.
Results: An inflammatory infiltrate (composed predominantly by T lymphocytes (CD3+), sparse CD20+ B cells and mean
CD4:CD8 T-cell ratio of 1.5) was evidenced in all 21 biopsies and classified in mild (10), moderate (11) and severe (0).
No correlation was shown between vulvar inflammatory infiltrate score and salivary Chisholm e Mason score.
No differences were found neither in gynecological symptoms neither in clinical and demographical characteristics
between patients with mild and those with moderate vulvar inflammatory score.
A higher prevalence of moderate inflammatory infiltrate was observed in biopsies from women with lichen sclerosus than
in pSS
Interferon free antiviral treatment of chronic hepatitis C in patients affected by β-thalassemia major
Chronic hepatitis C (CHC) significantly affects the prognosis
of liver disease [1] and health related quality of life (HRQOL)
in patients with β-thalassemia major [2, 3]. CHC cure is a
crucial event in the prognosis of the disease, since prevents
fibrosis progression, decreases the risk of hepatocellular carcinoma (HCC), and improves survival. Standard antiviral
therapy with Pegylated Interferon (PEG-IFN) and Ribavirin
(RBV) has long been the standard of care, despite its limited
efficacy and increased ribavirin induced hematological adverse events in thalassemic patients [4]. Recently, several novel highly effective direct antiviral agents (DAAs) have been
approved for HCV treatment, with impressive cure rates,
higher than 90%, after 8–12 weeks of therapy and mild adverse events [5], but there are no published reports
documenting the efficacy, safety and impact on QOL of available interferon-free antiviral regimens in patients with βthalassemia majo
Atypical haematoma/seroma following treatment for soft tissue sarcoma. Histopathology, 2009;54:505-507
Losartan ameliorates diabetic vascular hyper-reactivity to angiotensin II by reducing ROCK1 expression and activity
Bracket bonding to polymethylmethacrylate-based materials for computer-aided design/manufacture of temporary restorations: influence of mechanical treatment and chemical treatment with universal adhesives
Objective
To assess shear bond strength and failure mode (Adhesive Remnant Index, ARI) of orthodontic brackets bonded to polymethylmethacrylate (PMMA) blocks for computer-aided design/manufacture (CAD/CAM) fabrication of temporary restorations, following substrate chemical or mechanical treatment.
Methods
Two types of PMMA blocks were tested: CAD-Temp® (VITA) and Telio® CAD (Ivoclar-Vivadent). The substrate was roughened with 320-grit sandpaper, simulating a fine-grit diamond bur. Two universal adhesives, Scotchbond Universal Adhesive (SU) and Assure Plus (AP), and a conventional adhesive, Transbond XT Primer (XTP; control), were used in combination with Transbond XT Paste to bond the brackets. Six experimental groups were formed: (1) CADTemp®/SU; (2) CAD-Temp®/AP; (3) CAD-Temp®/XTP; (4) Telio® CAD/SU; (5) Telio® CAD/AP; (6) Telio® CAD/XTP. Shear bond strength and ARI were assessed. On 1 extra block for each PMMA-based material surfaces were roughened with 180-grit sandpaper, simulating a normal/medium-grit (100 mm) diamond bur, and brackets were bonded. Shear bond strengths and ARI scores were compared with those of groups 3, 6.
Results
On CAD-Temp® significantly higher bracket bond strengths than on Telio® CAD were recorded. With XTP significantly lower levels of adhesion were reached than using SU or AP. Roughening with a coarser bur resulted in a significant increase in adhesion.
Conclusions
Bracket bonding to CAD/CAM PMMA can be promoted by grinding the substrate with a normal/medium-grit bur or by coating the intact surface with universal adhesives. With appropriate pretreatments, bracket adhesion to CAD/CAM PMMA temporary restorations can be enhanced to clinically satisfactory levels
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