1,720,973 research outputs found
[Scanning electron microscopy and light microscopy under polarized light of a submandibular salivary gland calculus] Minerva Stomatol. 2001 May;50(5):173-80. Italian. PMID: 11420569 [PubMed - indexed for MEDLINE]
No full textCone beam computed tomography investigation of the antral artery anastomosis in a population of Central Italy
Full text linkBackground: The arterial vascular supply of maxillary sinus has to be considered in all the surgical procedures where it is involved. In particular, the intraosseous anastomosis between the posterior superior alveolar artery and the infraorbital artery branches in the bony canal can be tricky to a not well aware clinician. The aim of this study is to investigate the arterial blood supply of the maxillary sinus to give clinicians the basis for a better understanding of vascular complications that can derive from surgical procedures at this level. Materials and methods: One hundred cone beam computed tomography were analysed by the Imaging software for three-dimensional images, i-Dixel 2.0. The parameters considered have been the presence (i), the calibre (ii), the dorso-ventral length (iii) and the cranio-caudal distance (iv). The data have been processed with means, standard deviations and verified by T-Student test. Results: The statistical outputs showed that the 38% of samples presented the intraosseous anastomosis. Those anastomosis resulted long in dorso-ventral way both on left (12.55 ± 4.3 mm) and right side (12.4 ± 4.3 mm). The mean cranio- -caudal distance resulted 15.71 ± 5.08 mm on the left and 14.73 ± 4.74 mm on right side. The calibre measurements resulted quite big as well: 1.68 ± 0.3 mm on the left and 1.54 ± 0.38 mm on the right. The differences between the right and left sides were found not statistically significant. Conclusions: This in vivo investigation shows how a knowledge of the maxillary sinus vascularisation is essential during the programming surgical phase in order to prevent blood complications during the operations involving this region
Scanning electron fractography and histomorphometric analysis in fractured osseointegrated ti-alloy's implants
No full textEnzymatic analysis of the gingival crevicular fluid in hypoxia of high altitude (Everest).
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Evaluation of the F2000 bonding procedure: an high resolution SEM study.
No full textObjectives: The aim of this study was to define the morphological bonding of the F2000 Restorative System (3M Dental Product) to enamel and dentin. For this purpose, high resolution scanning electron microscope (SEM) in conjunction with a tensile bond strength analysis was used to correlate the morphological findings to the bonding potential. Scotchbond 1 (SB1) adhesive system was utilized as a control.
Materials and methods: Teeth were prepared in vivo and prepared as: (1) F2000 PA for 15 s, (2) F2000 PA for 30 s, (3) 35% phosphoric acid for 15 s and SB1 and (4) 35% phosphoric acid for 30 s and SB1. All teeth were then restored with the F2000 compomer restorative material, extracted, sectioned and analyzed by means of a field emission in-lens SEM (FEISEM). The conditioning/etching patterns of the two adhesive systems were also evaluated in vitro on dentin disks in order to show high resolution details of every single step of the bonding procedure.
Results: FEISEM images showed a repetitive pattern of the enamel crystals with several microporosities after the 30 s application of F2000 PA; moreover a good adaptation of the adhesive resin on the conditioned enamel was observable. FEISEM analysis of the dentin surface revealed no evidence of a smear layer after the application of F2000 PA for 30 s. Residual smear plugs were partially obliterating the tubule orifices when F2000 PA was used, while they were completely absent after etching with 35% phosphoric acid. The total etching technique revealed open tubules and resin tags formation after the application of SB1.
Conclusions: The one step etching/priming/bonding procedure of the F2000 PA showed favorable results at ultra-structural level when applied on both the enamel and the dentin surface for 30 s (as per manufactures’ instructions), but the bond strength analysis showed higher values of bonding of the F2000 compomer when the SB1 adhesive agent (after etching with 35% phosphoric acid) was used (7.7±2.2 vs 19.0±4.4 MPa)
Histological and scanning electron microscopy analysis of three immediate implants retrievend for a fracture of the abutment
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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