implants - international magazine of oral implantology

rial sets, it is trimmed and polished (Figs. 8a & b) then checked for stability on the model. Additional material can be added if required. If a stone model of the pros- thesisisavailable,itisconvenienttoconfirmthestabil- ity of the device and to assess that there is no contact between the prosthesis and the device (Fig. 9). The in- taglio surface is adjusted as required to ensure appro- priateadaptation. _In the clinic The chairside process is simplified by the use of this acrylicresinguidingdevicethatprovidesavisualaidfor the appropriate position for drilling the access holes. Ideally, porcelain should be removed using a diamond high-speedburwithcopiousirrigation.Iprefertousea rounddiamondburforthispurpose,asitislesslikelyto cause porcelain chipping. If the prosthesis is metal ce- ramic, the metal substructure is first penetrated with a smallroundcarbidebur.Subsequently,ametal-cutting tungsten carbide bur is used to widen the access as re- quired. Figure 10 shows a screwdriver passing through the guide into the abutment screw. Figures 11a and b show the precision of the preparation without over- preparation.Oncetheaccessholehasbeendebridedof obturating materials, an appropriate screwdriver is in- serted.Inordertopreventceramicdelamination,itisim- portanttoensurethedriverisnotcontactinganyporce- lainbeforesignificanttorqueisapplied.Iinitiallyinsert thedriverandinspectforlackofcontactwiththeporce- lain.Following,Iapplylighthandtorquetothedriverin ordertodeterminethatitisfullyseatedbeforeasecond inspection to ensure no porcelain contact. Finally, the screwandtheprosthesisareremoved. _Discussion Drilling free hand into the prosthesis with no guide can result in oversized access holes and wasted chair- sidetime.Theprimarygoalofthemethoddescribedhere istomaximiselaboratoryproceduresinordertoreduce chairsidetime.Themethodalsominimisesthesizeofthe access holes, which reduces damage to the prosthesis. Delegation of the construction of the device to a tech- nicalassistantcanfurtherreducecost,forboththepa- tient and us. Thereby, a task to which we look forward FAX +49-3 41/4 84 74-3 90 Please send me further information on the 41st International annual congress of the DGZI September 30–October 1, 2011, Cologne, Germany Office Stamp IM 2/11 41International ANNUAL Congress OF THE DGZI ST Implantology – Claims, possibilities and expectations Call for papers for download on www.dgzi.de Silver Sponsor:Gold Sponsor: Bronze Sponsor: AD Fig. 5b