Background A dentition with adequate function and esthetics is essential for the well-being and quality of life. A full implant-retained fixed prosthetics is an ideal solution for fully edentulous arch, however requires complex planning, surgical, and prosthetic procedure. With the help of digital workflow, it becomes a predictable and fast solution for the dentists and the patients. This retrospective study analyzed the most advanced surgical approach in full-arch rehabilitation with dental implants and immediate loading using digital workflow. Methods Patient records of fully edentulous jaws treated in four clinical centers in Warsaw, Poland, were evaluated. Computer-assisted planning and surgical template fabrication were done using the planning software coDiagnostiX™, based on a pre-op cone beam computed tomography (CBCT) and scanned data of a plaster model. A post-op CBCT was acquired after the placement of four to six implants by the guided system. The influence of different surgical variables on the discrepancy between planning and execution was analyzed, together with the biomechanical indices. Results A total of nine patient records were selected of 12 edentulous jaws treated with 62 implants. The overall mean three-dimensional (3D) offset at the implant base was 1.60 mm, at the tip 1.86 mm. The mean angle of deviation was 4.89°, the mean implant stability quotient (ISQ) 70.42, and the insertion torque 35.58 Ncm. The 3D offsets were influenced by the gender of the patient, treated jaw, the diameter, and length of the implant. The angle of deviation was affected only by the treated jaw. Insertion torque was influenced by the treated jaw, the age of the patient, the length of the implant, tooth type, and the side of the jaw. Discussion Bone quality of the patient and implant preparation procedure influenced the discrepancy between the planning and the execution of the digitally guided implant placement. Dense bone—mandible, posterior area, young age, and man—and multiple preparations of the implant bed—wider and longer implant—could be suggested as risk factors. Conclusion Digital workflow successfully enabled the immediate full-arch rehabilitation with a predictable outcome by different surgeons in multiple centers.
We compare the heat extraction efficiency for a standard Vertical External Cavity Surface-Emitting Laser and the distributed Bragg reflector (DBR)-free structure employing a single and double diamond heat-spreaders, respectively. Both heterostructures grown by Molecular Beam Epitaxy employ two identical active regions designed for emission at 980 nm. We show that the thermal resistance has been decreased 15 times when there is no DBR and heat is extracted from both side of active region. For DBR-free laser no thermal rollover of power conversion characteristic was observed in the range of considered input powers.
StreszczenieNagniatanie staje się coraz popularniejszą obróbką wykończeniową powierzchni przedmiotów o zło-żonym przestrzennie kształcie. Coraz częściej jest stosowana w produkcji form wtryskowych, matryc i tłoczników, a więc w przypadkach, gdy oprócz wymaganej dokładności geometrycznej duży nacisk kła-dzie się na stan warstwy wierzchniej. Integrowanie nagniatania z obróbką frezowaniem pozwala na uzyskanie powierzchni, których struktura geometryczna zależy od parametrów technologicznych obu zabiegów. Obecnie trudnością, na którą napotyka technolog, jest określenie takiego stanu powierzchni frezowanej, dla którego uzyska się zadowalające efekty wykończeniowego nagniatania. W artykule przedstawiono wyniki badań, w których do określenia efektywności parametrów technologicznych stosowanych w obu rodzajach obróbki użyto -oprócz parametrów struktury geometrycznej -parametrów izotropii powierzchni. Słowa kluczowe: izotropia powierzchni, frezowanie, nagniatanie THE ISOTROPY TESTS OF A MILLED AND HARD-BURNISHED SURFACE OF THE X160CRMOV121 STEEL AbstractBurnishing becomes an increasingly popular surface finishing treatment method of objects with a spatially complex shape. It is used increasingly more often in production of injection moulds, matrixes and dies, i.e. in cases when, apart from the required geometrical accuracy, much emphasis is placed on the condition of the outer layer. Integration of burnishing with milling allows obtaining of surfaces with a geometrical structure depending on the technological parameters of both techniques. Currently, a difficulty encountered by technologists is determination of such a milled surface condition for which satisfactory effects of finishing burnishing will be obtained. The article presents the results of tests in which, apart from the geometrical structure parameters, the surface isotropy parameters were used to determine the efficiency of the technological parameters used in both machining types. Keywords: surface isotropy, milling, burnishing 641 BADANIA IZOTROPII POWIERZCHNI FREZOWANEJ I NAGNIATANEJ NA TWARDO ZE STALI X160CrMoV121Emilia BACHTIAK-RADKA 1 , Daniel GROCHAŁA 1 , Krzysztof CHMIELEWSKI 1 , Wiesław OLSZAK 1 1. FREZOWANIE I NAGNIATANIE NA TWARDO Do największych problemów we współczesnych technikach wytwarzania należy zaliczyć możliwość świadomego kształtowania warstwy wierzchniej części dostosowanej do warunków w jakich będzie eksploatowana [1][2][3][4][5][6][7][8][9][10][11]. Skala problemu rośnie wraz ze wzrostem wymagań funkcjonalnych stawianych wytwarzanym przedmiotom oraz ze stopniem skomplikowania opracowanej technologii. Najczęściej technolog do wytworzenia powierzchni funkcjonalnych łączy w jednej operacji różne zabiegi obróbkowe [1][2][3][4][5][6][7][8][9][10][11][13][14][15][16][17][18]. Za wartości pionowych i poziomych parametrów otrzymanej struktury geometrycznej powierzchni w dużej mierze odpowiedzialne są parametry technologiczne zrealizowanych zabiegów [1-3, 5-11, 15-18]. Jednak za końcową teksturę powierzchni oprócz parametrów technologicznych w du...
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