Precision of fit of implant‐supported screw‐retained 10‐unit computer‐aided‐designed and computer‐aided‐manufactured frameworks made from zirconium dioxide and titanium: an in vitro study

Abstract

Optical and tactile scanners with CAD/CAM technology allow for the fabrication of highly accurate long-span screw-retained ZrO implant-reconstructions. Titanium frameworks showed the most consistent precision. Fit of the cast alloy frameworks was clinically inacceptable.

In vitro precision of fit of computer-aided design and computer-aided manufacturing titanium and zirconium dioxide bars

“…This was not the case with the ZrO-P bars that had constantly increasing values toward the distant implant 15. Previous data from cuspid-supporting zirconia frameworks (NobelBiocare Procera system) showed in contrast to the present ZrO bars an u-shape precision pattern for the different implant positions [10]. Two ZrO-P bars showed maximal values of >80 m for the most distant implant 15.…”

“…A controlled laboratory study was performed as described by Katsoulis et al [10]. In short, an edentulous maxillary jaw model was made from polyester resin (EFCO Produkte GmbH, Germany) and stored for 7 days before implant analogon placement.…”

“…While scanning may be performed by local laboratories, some production centers prefer to scan the model in-house for standardizing their procedures and minimizing external manual errors in the initial phase of the digital chain. Precision of fit of CAD/CAM frameworks has been shown to be more accurate than conventional techniques [10][11][12][13]. Although controversially discussed, misfit of a rigid framework may enhance the risk for technical and biological complications [14,15].…”

The accuracy of the CAD system using intraoral and extraoral scanners for designing of fixed dental prostheses

“…In the fabrication of prostheses using a CAD/CAM workflow, long-term clinical success 1,2) depends on the systems involved in scanning the tooth surface and in prosthesis design, which determine the marginal and internal fit of the restorations to the abutment tooth [3][4][5][6][7][8] . Dental impressions are the most important step in the fabrication of prostheses in restorative dentistry.…”

Titanium removable denture based on a one-metal rehabilitation concept

“…On the contrary, the occurrence of a chemical reaction layer from the titanium casting is an inevitable disadvantage 51,52) . As an alternate method for the manufacturing of titanium frameworks, most implant superstructures, including abutments, have been fabricated using computer-aided design/computeraided manufacturing (CAD/CAM) instead of casting [53][54][55] . Using CAD/CAM, titanium frameworks for RPDs have also started being fabricated by milling titanium disks and additive manufacturing from titanium powders.…”