engleski

Success, biological and technical complications with screw retained fixed partial dentures on implants in the edentulous mandible ; 3– 6 year results

Aim: To assess in a period of 3– 6 years the success, biological and technical complications of screw retained fixed partial dentures (FPD) on AstraTech implants. Materials and methods: In 42 patients a total of 238 implants were placed in edentulous mandibles. Of the 238 implants 75 were immediate, 22 were placed after 6– 8 weeks, others were placed in a standard procedure. Of the 42 patients 32 received 6 implants, 3 received 5, while 7 received 4. In 38 patients the implants were placed in the inter-foraminal region, in four patients the implants were placed in the entire mandible. Results: One implant failed to osseointegrate (0.4%). 28 implants had exposed implant necks (11.7%), while 7 implants had periimplantitis (2.9%). FPD: 28 were metal-ceramic (66.6%), 14 were metal-acrylic (33.3%), and there were 131 cantilevers. Five FPD experienced metal framework fractures (11.9%) and were remade, porcelain fractured in 11 cases (26.2%), acrylic fracture occurred once (2.3%). Screw fractured in seven cases (2.5%), abutment fracture occurred once (0.4%). Conclusions: Implant borne screw retained FPD are a reliable method of treating complete edentulous patients. A relatively high incidence of technical complications for the screw retained FPD could be because of the problems with the passive fit of the metal framework leading to the deformation of the suprastructure. With the new developments such as the Cresco system for the passive fit a number of complications could be eliminated

implants; success; mandible

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