19^th American Dental Congress

Biography

Biography: Maria Jose Jimenez Suarez

Abstract

The aim of the study was to compare the marginal fit of zirconia copings fabricated with two different CAD/CAM systems: Cerec
InLab (Sirona®) and Zirkonzahn (Zirkonzahn®) with a pantograph system Zirkograph 025 ECO (Zirkonzahn®). Material and
methods: Cr-Co master model with a zirconia crown preparation of an upper premolar was manufactured. Ten zirconia copings were
fabricated for each group following manufacturer’s instructions. Control group consisted of ten metallic copings. A replica technique
was used with elite HD+ polyvinyl siloxane (Zhermack®). Measurements were taken using a stereomicroscope at 50x magnification
to determine the absolute marginal discrepancy and marginal width of each coping. Statistical analysis was conducted using IBM
SPSS® software. T-test study was conducted in order to compare obtained data. Results showed that the mean marginal absolute
discrepancy and marginal width were: 92.14±38.59 and 78.62±31.33 μm for Cerec InLab (Sirona®) CAD/CAM system, 38.71±12.62
and 36.91±13.56 μm for Zirkonzahn (Zirkonzahn®) CAD/CAM system, 77.92±38.01 and 69.42±33.23 μm for Zirkograph 025 ECO
(Zirkonzahn®) pantograph system. Control group exhibited 44.11 ± 15.36 and 43.74±15.70 μm. With respect to absolute marginal
discrepancy and marginal width, statistical significant differences were observed when comparing Cerec InLab (Sirona®) and
Zirkograph 025 ECO (Zirkonzahn®) with control group. No statistical significant differences were observed between Zirkonzahn
(Zirkonzahn®) CAD/CAM and the control group. Overall level of statistical significance was p>0.001. It can be concluded that
Zirkonzahn® CAD/CAM system was the most accurate system of all. CAD/CAM Cerec InLab system (Sirona®) proved to be the less
precise system.