Please activate JavaScript!
Please install Adobe Flash Player, click here for download
ePaper created 2014-11-20, 16:14:55 | version 1.30.01
I case report _ double crowns 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, more and more telescope or conical crown ap- plications 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 depending on the condition of the jaw. However, these attachments are usually inferior in fixation compared to a double crown restoration. Especially, one-piece implant systems—possibly with implants reduced in diameter and length—with simple ball retaining ele- ments, such as rubber rings, are absolutely inappro- priateintermsofalaterchangeofthesuperstructures. A restoration with double crowns is more complex for both the dentist and the technician with regards to efforts and costs. In the following, a new technique is describedusingprefabricatedpartsandanewmaterial combining the advantages of telescopic or conical crown technology with the ease of processing and manufacturing. The application should possibly be doneaschairsidealternative,whichisreasonablypriced in the dental laboratory. For fixed detachable prosthe- ses, new possibilities for avoiding screw retention are alsodescribed. Doublecrownsmadeofanew highperformancepolymer Authors_Drs Rolf Vollmer, Martina Vollmer, ZTM Michael Anger & Dr Rainer Valentin, Germany 20 I CAD/CAM 4_2014 Fig. 1a Fig. 1b Fig. 2a Fig. 2b CAD0414_20-30_Vollmer 17.11.14 12:15 Seite 1 CAD0414_20-30_Vollmer 17.11.1412:15 Seite 1