Face: possibilidade de reconstrução protética (relato de um caso)

The authors report a case of surgical induced facial deformity with prosthetics reconstruction. The reconstruction was performed with an ocular, palpebral, maxilo, nasal prostheses and a total denture with palatal obturation. The prosthesis was fixed with magnetic retention.

Improvement facial aesthetics with immediate denture treatment

Background: immediate dentures are one of denture treatment that provides a rapid treatment stage to improve aesthetics without patients experiencing toothless phase due the tooth is extraction or decaputated. Purpose: To reported maxillary immediate partial denture and mandibulary immediate complete overdenture with magnetic retention to improve facial aesthetics. Case: A-56 years old woman with twelve tooth loss (17,16,15, 26,34,35,36,37,44,45,46,47) and have fillings teeth on 21,11 and 12 patched in dental artisans less more than 1 year and now its felt swollen with mobility 30 in the last few weeks and teeth 31,41,42,43 experienced mobilitys 20 due to calculus and teeth 32,33 were deep caries with mobility 30. Case Management: in phanoramic photo teeth 11,21 and 22 saw a large periapical lesion Ø 10mm and its advised to extract. In 32 and 33, non-immediate extraction was performed because periapical lesions and deep caries are large enough with the presence of periapical abscesses, while teeth 31, 41, 42 and 43 are scaling and rootplaning then endodontic treatment is performed to obtain a harmonious relationship between the upper anterior teeth and below the teeth 31,41.42.43 is immediately decaputated and restored with GI cement on the surface of the teeth and magnet keeper coping was done for 43. Discussion: The main objective of the immediate denture treatment is to avoid psychological, social and discomfort from look toothless Conclusion: Immediate denture is the choice of treatment to improve the retention and facial aesthetic.

A Bistable Shape Memory Microswitch

A novel concept of a bistable microswitch is presented, which combines an antagonistic shape memory alloy (SMA) actuation mechanism with two end positions and magnetic components to maintain these positions in power-off state. The layout of the antagonistic SMA actuation mechanism consists of two mechanically coupled freely suspended TiNi microbridges of 20 μm thickness, which are prestrained with respect to each other. The electro-thermo-mechanical response of the coupled microbridges is investigated for various degrees of prestrain to determine the maximum actuation stroke, minimum required magnetic retention force and maximum switching force. For magnetic retention, the ferromagnetic attraction of different hard and soft magnetic microstructures is studied. By varying the diameter of a hard magnetic cylinder for a given diameter of a soft-magnetic disc and fixed thicknesses, the ferromagnetic attraction force displays a pronounced optimum. First demonstrator microswitches with outer dimensions of about 7×7×4 mm3 are presented, which show large work outputs, featuring strokes and contact forces up to 84 μm and 60 mN, respectively.