Marginal Discrepancy of All-Ceramic Crowns Cemented on Implant Abutments |
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| Authors: | J Kenneth Sutherland DMD MS Robert W Loney DMD MS † Sara Syed DMD ‡ |
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| Institution: | Associate Professor and Director, Division of Fixed Prosthodontics, Department of Restorative and Prosthetic Dentistry, College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.;Associate Professor and Director, Division of Removable Prosthodontics, Department of Restorative and Prosthetic Dentistry, College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.;Student, College of Dentistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada. |
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| Abstract: | Purpose The purpose of this investigation was to determine the mean marginal discrepancy of all-ceramic crowns cemented on implant abutments. Materials and Methods Five Brånemark CeraOne abutments were connected to implant fixtures embedded in acrylic resin blocks. The marginal discrepancy was measured using a video camera connected to a digitizing board at four locations on each abutment for five samples in each of the following groups: all-ceramic caps (caps), all-ceramic crowns (crowns), and all-ceramic crowns cemented with zinc phosphate cement (cemented crowns). Results The mean marginal discrepancies were as follows: caps, 99.0 μm (SD, 16); crowns, 117.8 μm (SD, 20); and cemented crowns, 168.8 μm (SD, 23). Statistically significant differences were found between all three groups at the 99% level of confidence. In addition there were two significant differences between abutments. Conclusions Subgingival marginal discrepancies of the magnitude measured in this study have been shown to cause periodontal problems. It is probable that the marginal discrepancy of CeraOne restorations, as tested, can be improved. Efforts should be made to enhance the marginal accuracy of these restorations. |
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| Keywords: | CeraOne implant cement marginal discrepancy |
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