الفهرس | Only 14 pages are availabe for public view |
Abstract Osseouintegrated dental implants had been proved successful in total and partial edentulous treatment cases (1-5). There is a great variety of alternative therapeutic prostheses at hand which, for practical reasons, will be classified as follows: Wholly or partially made of porcelain fixed prostheses, either cemented or screw-retained. Porcelain crowns can only replace lost teeth, bland tissues and alveolar bone (4, 6). Implant mucous-retained overdentures. They are a simple and efficient solution for patients with whole prosthetic stability problems. The function of the implant is only that of retaining on the mucous rest. Two implants at least and never more than four are necessary for their making. Fewer implants than the totally implant supported overdenture are necessary, and the procedure of their making is simple and cheap. They have O-ring, locator and round bars with Hader clips, among others, kinds of attachments, which anchor the implant to the overdenture. It is a resilient anchorage system which allows vertical and rotary movement of the overdenture. This prosthetic design uses bone crowns as primary holding areas. chronic occlusion pressure would inevitably produce a progressive wearing off the alveolar bone, except for the areas where implants are placed (4, 7). Implant supported overdentures. Milled bar and telescopic overdentures are under this group. The implant acts as retainer and prosthetic holder. They present a rigid anchorage system between the implant and the overdenture, and do not need to be held on soft tissues. Its operational biomechanism is similar to that of fixed porcelain and hybrid prostheses. The implant supported milled bar overdenture presents one or two milled bars that are conically oriented from 2 to 10 grades. The overdenture, which is removable, |