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implants international magazine of oral implantology

I case report Figs. 1a & b_Individually made telescopic crowns with secondary parts electroplated in “passive fit” technology glued to a metal frame. Figs. 2a & b_Telescopic crowns on IMC cylinder implants (Dr. Nikola Laux 1984). _Double crowns in form of telescopic or conical crowns have been used for many decades in dental prosthetics. In the beginning of dental implantology prosthetics,therewerestilldroughtsaboutthetransfer of these constructions on the implant-supported den- tures. However, in the practical application more and moretelescopicorconicalprostheticsrecentlyprevail. _Introduction In the 70s and 80s, the bar restoration on implants was the first choice e.g. by Ledermann (1979). Over the years,moreandmoretelescopeorconicalcrownappli- cations have been described for implant-supported dentures.Fromtheexperienceoftheauthoritisclearly determinable that a double crown restoration in the mandible with four implants and secondary crowns is indicated. For example, they would provide very good andstablelong-termresultsinelectroplatingtechnique (Figs.1a&b). The alternatives offered in form of attachments of various kinds stabilise the prosthesis more or less de- pendingontheconditionofthejaw.However,theseat- tachmentsareusuallyinferiorinfixationcomparedtoa doublecrownrestoration.Especially,one-pieceimplant systems—possibly with implants reduced in diameter andlength—withsimpleballretainingelements,suchas rubber rings, are absolutely inappropriate in terms of a later change of the superstructures. A restoration with doublecrownsismorecomplexforboththedentistand the technician with regards to efforts and costs. In the following,anewtechniqueisdescribedusingprefabri- cated parts and a new material combining the advan- tagesoftelescopicorconicalcrowntechnologywiththe easeofprocessingandmanufacturing.Theapplication shouldpossiblybedoneaschairsidealternative,which is reasonably priced in the dental laboratory. For fixed detachable prostheses, new possibilities for avoiding screwretentionarealsodescribed. Doublecrownsmadeofanew highperformancepolymer Author_Dr Rolf Vollmer, Dr Martina Vollmer, ZTM Michael Anger & Dr Rainer Valentin 24 I implants3_2014 Fig. 1a Fig. 1b Fig. 2a Fig. 2b

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