CAD/CAM fabrication accuracy of long- vs. short-span implant-supported FDPs

Katsoulis, Joannis; Müller, Philipp; Mericske, Regina; Blatz, Markus B (2015). CAD/CAM fabrication accuracy of long- vs. short-span implant-supported FDPs. Clinical oral implants research, 26(3), pp. 245-249. Wiley-Blackwell 10.1111/clr.12522

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OBJECTIVE To compare the precision of fit of long-span vs. short-span implant-supported screw-retained fixed dental prostheses (FDPs) made from computer-aided-design/computer-aided-manufactured (CAD/CAM) titanium and veneered with ceramic. The null hypothesis was that there is no difference in the vertical microgap between long-span and short-span FDPs. MATERIALS AND METHODS CAD/CAM titanium frameworks for an implant-supported maxillary FDP on implants with a flat platform were fabricated on one single master cast. Group A consisted of six 10-unit FDPs connected to six implants (FDI positions 15, 13, 11, 21, 23, 25) and group B of six 5-unit FDPs (three implants, FDI positions 21, 23, 25). The CAD/CAM system from Biodenta Swiss AG (Berneck, Switzerland) was used for digitizing (laser scanner) the master cast and anatomical CAD of each framework separately. The frameworks were milled (CAM) from a titanium grade V monobloc and veneered with porcelain. Median vertical distance between implant and FDP platforms from the non-tightened implants (one-screw test on implant 25) was calculated from mesial, buccal, and distal scanning electron microscope measurements. RESULTS All measurements showed values <40 μm. Total median vertical microgaps were 23 μm (range 2-38 μm) for group A and 7 μm (4-24 μm) for group B. The difference between the groups was statistically significant at implant 21 (P = 0.002; 97.5% CI -27.3 to -4.9) and insignificant at implant 23 (P = 0.093; -3.9 to 1.0). CONCLUSIONS CAD/CAM fabrication including laboratory scanning and porcelain firing was highly precise and reproducible for all long- and short-span FDPs. While all FDPs showed clinically acceptable values, the short-span FDPs were statistically more precise at the 5-unit span distance.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology

UniBE Contributor:

Katsoulis, Joannis; Müller, Philipp and Mericske, Regina


600 Technology > 610 Medicine & health








Eveline Carmen Schuler

Date Deposited:

29 Mar 2016 10:50

Last Modified:

11 Sep 2017 20:39

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

CAD/CAM, fixed dental prosthesis FDP, framework misfit, implant-supported, long-span, passive fit, short-span




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