Über den Autor
C. Mertens, H. G. Steveling
New possibilities with CAD/CAM bars – six years of experience
The use of bars is a well-documented treatment option for edentulous jaws. The possibility to avoid the casting process and to produce these bars by milling non-precious blanks in different sizes has extended the indication to use bars also for challenging cases.
Background and aim
In the last six years 10 of 150 bar-retained reconstructions were made for patients after a hemi-maxillectomy. Implants were placed in the alveolar crest of the contralateral side and to the os zygomaticum of the ectomy side.
Methods and materials
All impressions were made with an open tray from the abutment level. Due to the different levels of the abutment blanks with the dimension of 65 x 65 x 30 mm were necessary. The major height difference of the abutment was 36 mm. All the bars and supra-construction was made in chrom-cobalt combined with acrylic material.
All bars had an optimal fit and there was no need for a cutting and a new intraoral fixation. The dimension of the bars are always calculated by the manufacturer, so up to now we never have seen mechanical problems even for the challenging indications.
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CAD/CAM bars have a precise fit, no shrinkage cavities and the software always calculate an optimal dimension of the bars. They can be used in standard situations as well as in advanced cases.