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In Vitro Fit and Distortion of CAD/CAM-Fabricated Implant-Fixed Titanium and Zirconia Complete Dental Prostheses Frameworks

AL-Meraikhi, Hadi Nasser
http://rave.ohiolink.edu/etdc/view?acc_num=osu1449063197

Abstract Details

2015, Master of Science, Ohio State University, Dentistry.
Purpose: The aim of this study was to compare the marginal fit and 3-dimensional distortion of implant-fixed screw-retained computer-aided designed and computer-aided manufactured (CAD/CAM) zirconia and titanium complete dental prostheses (CDP) fabricated on 4 implants. Materials and Methods: A master edentulous model with 4 implants (#3, 6, 11, 14) was used in this study. Multi-unit abutments (Nobel Biocare) were digitally scanned using scan bodies and a laboratory scanner (S600 ARTI, Zirkonzahn). A CAD software (Zirkonzahn) was used to design complete-arch screw-retained implant prostheses and the file was sent to a milling machine for CAM. Titanium (n=5) and zirconia (n=5) frameworks were milled on 4 implants. All frameworks were scanned at one-screw test position (screw tightened only into implant #14) using an industrial computed tomography (CT) scanner (Nikon / X- Tek XT H 225kV MCT Micro-Focus). The direct CT scans were reconstructed to generate polygonal mesh models (STL) from the voxel data set and transported to a volume graphics analysis software (PolyWorks, Innovmetric) from which measurements were extracted. The 3D gap measurement between the circular mating surfaces of the frameworks and implant abutments were measured for implant #11 (Gap 2), implant #6 (Gap 3) and implant #3 (Gap 4). In addition, color maps were generated to show the gap size between the mating surfaces using +/- .500 mm color scale ranges. To calculate the 3D distortion of the titanium and zirconia frameworks, STL files of the direct CT scans were aligned to the CAD model using a sum of the least squares best fit algorithm. Surface comparison points were placed on the CAD model on the mid-facial aspect of all teeth. The 3D distortion of each direct scan to the CAD Model was calculated using inspection software (PolyWorks, Innovmetric). In addition, color maps of the scan to CAD comparison were constructed using +/- .500 mm color scale range. Results: Results showed that the material type (zirconia or titanium) was not significant for 3D gap measurements (p=.9038). However, 3D gap measurement values were significantly different between Gap 3 and 4 within each group (P=.0003). The mean 3D gap measurement for Gap 2 for titanium was 48.2 µm (SD 2.6). The mean 3D gap measurement for Gap 3 for titanium was 74.0 µm (SD 15.0) and 84.4 µm (SD 12) for zirconia. The mean 3D gap measurement for Gap 4 for titanium was 102 µm (SD 26.7) and 93.8 µm (SD 30) for zirconia. All 3D gap measurements showed values <135 µm. Results for the 3D distortion from the CAD model showed that both materials exhibited distortion. However, there was no significant difference in the amount of distortion from the CAD model between the materials (p =.7475). Conclusions: Within the limitations of this in vitro study, implant-fixed CAD/CAM- fabricated titanium and zirconia frameworks showed comparable marginal fit. 3D micro gap measurements of frameworks showed clinically acceptable misfit values. In addition, zirconia and titanium frameworks showed similar 3D distortion when compared to the CAD model. Absolute passive fit was not achieved.
Burak Yilmaz (Advisor)
58 p.
Dentistry

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Citations

  • AL-Meraikhi, H. N. (2015). In Vitro Fit and Distortion of CAD/CAM-Fabricated Implant-Fixed Titanium and Zirconia Complete Dental Prostheses Frameworks [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449063197

    APA Style (7th edition)

  • AL-Meraikhi, Hadi. In Vitro Fit and Distortion of CAD/CAM-Fabricated Implant-Fixed Titanium and Zirconia Complete Dental Prostheses Frameworks . 2015. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1449063197.

    MLA Style (8th edition)

  • AL-Meraikhi, Hadi. "In Vitro Fit and Distortion of CAD/CAM-Fabricated Implant-Fixed Titanium and Zirconia Complete Dental Prostheses Frameworks ." Master's thesis, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449063197

    Chicago Manual of Style (17th edition)

osu1449063197
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This open access ETD is published by The Ohio State University and OhioLINK.