Journal of the Korean Academy of Esthetic Dentistry
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The¿xed restorations could be cement-retained or screw-retained to the implant abutments.
The advantage of screw-retained is the easiness of retrieval when the dentist may need to remove the implant prosthesis for hygiene, design modi¿cation, fracture repairs, and abutment-screw tightening.
However, screw-retaind restorations require precise implant position for the screw-access hole. Also, it is hard to obtain passivity of screw-retained frameworks due to the error in the laboratory process.
Cement-retained implant restorations have some advantages, such as good esthetics and simple fabrication, occlusion and reduced cost.
Unfortunately, little evidence demonstrates predictable retrievability of various provisional luting agents when cementing two components together.
These cases report a new design of customized abutment using CAD/CAM technology which could give a retrievability to the cement-retained restorations.
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Vincent Prestipino et al reported a practical approach for retrieving cement-retained, implant-supported restorations on QDT 2001. They applied similar ideas to gold-casting customized abutments. But the concept could not be popular because the lab fee cost too much now.
The¿rst design of the slot placed customized abutment manufactured by CAD/CAM techniques originated from the cooperation between the dentist and the dental CAD designer. Trials and errors were required to fully understand the concept of the slot placed abutment design.
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Journal of the Korean Academy of Esthetic Dentistry For customized abutment, new dental CAD/CAM techniques are employed for preparation design with the supra- gingival margin on the mid-marginal position of the lingual/palatal surface of the abutment.
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Journal of the Korean Academy of Esthetic Dentistry
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Another case of RCS abutment on the multiple¿xed restoration as follows.
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Journal of the Korean Academy of Esthetic Dentistry
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The use of this RCS technique is for a retrieval of the restoration on the abutment whenever it is necessary. The fabrication of the crown with slot is similar to the conventional method of other dentist and technician.
However, the difference between the conventional cement-type restoration and the RCS restoration is the selection of especially designed customized abutment manufactured by CAD/CAM technique easily and economically
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A simple, economic, and predictable RCS abutment method that gives the dentist to get all of the advantages of the custom-made, cement-retained implant abutment technique and to ensure retrievability of the prosthesis
Cooperation between the dentist and the laboratory technician is always required to maximize the successful esthetic and functional outcome of the implant restoration.
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