European Journal of Prosthodontics and Restorative Dentistry

Zirconia-Reinforced Lithium Silicate Ceramic - A 2-Year Follow-up of a Clinical Experience with Anterior Crowns

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Cover Date

March 2017

Print ISSN

0965-7452

Electronic ISSN

2396-8893

Vol

25

Issue

1

Abstract

ABSTRACT
The purpose of this study was to compare the accuracy of zirconia FPDs fabricated by different laboratory CAD/CAM system. Thirty-six FPD zirconia frameworks were fabricated on corresponding epoxy resin models that were duplicated from a master model of mandibular second premolar and second molar mounted in an acrylic block to simulate missing first mandibular tooth. Frameworks were divided into groups (n = 12) of three laboratory CAD/CAM systems: Cercon, Amann Girrbach, and Zirkonzahn. For the two factors, system and abutment type, the absolute marginal discrepancy (AMD)
was measured before cementation. Internal fit was also determined at three sites after cementation. The data were analyzed statistically (α = 0.05). The effects of system and tooth type were not significant for AMD (p > 0.05). Both factors showed influence on the internal fit of FPDs (p < 0.05). Molars showed larger gaps in axial and occlusal
sites (p = 0.001 and p = 0.003), and Cercon led in better occlusal adaptation compared with Amann Girrbach (p = 0.013). The systems tested did not show differences in AMD, despite different incorporated components. However, internal fit was significantly different between tooth type and system.

Keywords
CAD/CAM System
Marginal Adaptation
Internal Fit
Zirconia FPD