One-piece castings in fixed prosthodontics: a study of marginal adaptation using computerized SEM images.
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Dental Casting Investment↗
Biomedical subjects
A Scipioni
Publications and source records attributed to A Scipioni.
[Phlebography with MR in the study of deep venous thrombosis].
MR phlebography was recently proposed as a possible alternative to contrast venography in the detection of deep venous thrombosis. We focused our work on the study of the pelvic veins since it is at this level that contrast venography and the other noninvasive techniques, i.e., phlebography, impedance plethysmography and US, exhibit their major limitations. Thirty patients underwent MR phlebography: 13 of them had a diagnosis of DVT of the pelvic venous district and the other 17 had negative results for this condition. All the patients were also examined with color-Doppler US at the pelvis and legs. In all the patients submitted to MR phlebography, thrombosis site and presence were demonstrated, with diagnostic information also on its extent and adhesion to vein wall. To conclude, MR phlebography can provide contrast venography-like images in a noninvasive way, with high accuracy (100% sensitivity and 90% specificity) especially in the pelvic district where the limitations of other techniques are more apparent. Larger series of patients must be studied to assess the actual role of MR phlebography in the patients with DVT or at high risk for this condition.
Femoral Vein↗
Endorectal magnetic resonance imaging in the preoperative staging of rectal tumors.
A proper preoperative staging of rectal tumors is important for correct treatment planning. We included in our study 23 patients with rectal carcinoma in order to evaluate the diagnostic accuracy of endorectal MRI. This technique enabled us to show neoplasms as a hyperintense lesion as compared to the muscolaris. To better delineate the renal dimensions of the neoplasms and reduce chemical shift artifact we performed T2 weighted TSE sequences with and without fat suppression. The diagnostic accuracy in the evaluation of T and N factors as compared to surgery was respectively 78.2% and 78.9%. The major problem has been a slight tendency to overstage parietal infiltration and lymphnodal involvement. Endorectal MRI allows us to obtain an excellent anatomic detail of the three rectal wall layers and a very high spatial resolution which might make this technique the examination of choice in the evaluation of rectal carcinoma.
Humans↗
Localized management of sinus floor with simultaneous implant placement: a clinical report.
Localized management of sinus floor (LMSF) achieves implant placement and sinus lifting simultaneously. LMSF is a further application of the principles of the edentulous ridge expansion (ERE) technique. It comprises the dissection of a partial-thickness flap, the buccal expansion of the residual alveolar bone, and the fracture and elevation of the sinus floor with simultaneous implant placement. Three hundred three patients were treated with 499 implants placed using the LMSF between April 1988 and December 1993. The selected patients, who showed no signs of sinus pathology, exhibited insufficient vertical alveolar bone dimensions for the placement of dental implants with the traditional technique. The minimal residual alveolar bone height was between 5 and 7 mm. Based on the criteria established by Albrektsson and his coworkers in 1986, the success rate of the 499 implants placed with the LMSF was 97.5%.
Alveolar Process↗