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Operative Conditions (operative + condition)
Selected AbstractsClinical and Radiographic Evaluation of the 5-mm Diameter Regular-Platform Brånemark Fixture:2- to 5-Year Follow-upCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 1 2002DSc Odont, Georges Tawil DDS ABSTRACT Purpose: The purpose of this study was to report the clinical results obtained with 5-mm diameter regular-platform Brånemark implants after 2 to 5 years of follow-up. A secondary aim was to compare the clinical outcome to that of adjacently placed standard 3.75-mm fixtures in the same patients under the same operative condition and in the same prosthetic construction. Materials and Methods: Sixty patients, with a mean age of 54 years, received a total of 97 5-mm diameter regular-platform fixtures. The majority of the implants were placed at molar sites. In 41 of the patients, 53 5-mm diameter implants were placed adjacent to 62 standard 3.75-mm diameter fixtures in the same prosthetic reconstruction. All implants were submerged for an average period of 4 to 6 months. Abutment connection was done according to standard protocol. The prosthetic treatment consisted of freestanding fixed bridges. Results: The cumulative survival rate of the 5-mm diameter implants loaded for a period of 2 to 5 years was 96.9%. Only three implants failed. They were placed in type 4 bone in the posterior maxilla. Bone loss over the first year was 0.70 mm and over a 3-year period 0.81 mm. Implants placed in type 4 bone showed significantly higher bone loss. No difference in the resorption rate could be found between the maxillary and the mandibular implants or between the various implant lengths. There was no significant difference between the bone loss around the 5-mm diameter fixtures and the adjacent 3.75-mm diameter standard fixtures. Conclusion: The present study demonstrated a high predictability of 5-mm diameter regular-platform implants when placed in the posterior maxilla and mandible. [source] The CARSO procedure in process optimizationJOURNAL OF CHEMOMETRICS, Issue 1 2003Massimo Baroni Abstract This paper reports the optimization of the operative conditions of an industrial plant, the electrolytic production of zinc by the leaching method, on applying the CARSO procedure, a response surface methodology based on PLS modelling, the peculiarity of which lies in the way the highest response value within the experimental domain is found. The results illustrate the operative ranges of a few key parameters for six different responses. Copyright © 2003 John Wiley & Sons, Ltd. [source] Human ABO Blood Group Is Important in Survival and Function of Porcine Working HeartsAMERICAN JOURNAL OF TRANSPLANTATION, Issue 3 2003Rizwan A. Manji Pig organs express ,Gal antigen and thus are hyperacutely rejected if perfused by human blood. Human B/A antigens are similar to pig ,Gal antigen, suggesting that the corresponding antibodies may cross-react. Our purpose was to determine if there is a human ABO blood-group difference in porcine,human xenotransplantation. Plasma from six A, five B, seven AB, and six O individuals pooled by blood group were tested in an ex-vivo porcine working heart model. Blood-group A plasma-perfused hearts survived 20 ± 14 min (n = 5), B 241 ± 9 min (n = 3), AB 151 ± 37 min (n = 5), and O 9 ± 1 min (n = 8). A and O were different (p < 0.001) from B and AB. Function was significantly better in group B. Edema accumulation and creatine kinase change was highest in A and O. All groups had comparable levels of anti-,Gal antibody, as well as comparable perfusion and operative conditions. Multivariate linear regression analysis showed the anti-B antibody levels to be predictive of survival (p < 0.001). At higher plasma concentrations, hearts perfused with B plasma survived longer (p =,0.01) than AB (218 ± 45 min, n = 4 vs. 6 ± 0 min, n = 3). These results suggest a human ABO blood-group difference in porcine-to-human xenotransplantation, which may be mediated by the anti-A and anti-B antibodies. [source] Electrocarboxylation of Benzyl Halides through Redox Catalysis on the Preparative ScaleCHEMISTRY - A EUROPEAN JOURNAL, Issue 28 2006Onofrio Scialdone Dr. Abstract The electrocarboxylation of benzyl halides to the corresponding carboxylic acids through homogeneous charge-transfer catalysis was investigated both theoretically and experimentally to determine the influence of the operative parameters on the yield of the process and on the catalyst consumption. Theoretical considerations, based on fast kinetics of redox catalysis, were confirmed by the electrocarboxylation of 1-phenyl-1-chloroethane catalyzed by 1,3-benzenedicarboxylic acid dimethyl ester performed at a carbon cathode under different operative conditions. We obtained high yields of the target carboxylic acid and experienced a low catalyst consumption by operating with optimized [RX]bulk/[CO2]bulk and [RX]bulk/[catalyst] ratios. [source] | |||||||||||||