Poliklinik für Zahnärztliche Prothetik

Direktor: Prof. Dr. Gerhard Handel


Marginal adaptation of CAD-CAM ZrO2 ceramic with different cements

M. ROSENTRITT*, M. BEHR, R. LANG, G.GRÖGER, G. HANDEL

(Department of Prosthetic Dentistry, University of Regensburg, Germany)

The aim of this study was to investigate the marginal adaptation between CAD-CAM ZrO2 all-ceramic fixed partial dentures (FPDs) and human teeth using different cements. 32 three-unit FPDs were fabricated of the CAM-CAM ZrO2 all-ceramic Lava/Lava Ceram (3M ESPE, G) and fixed on human molars using the resin composites Variolink II/Syntac Classic (Ivoclar-Vivadent, FL), Panavia F/ED (Kuraray, J), Compolute/EBS Multi and a novel self-adhesive universal resin cement RelyX Unicem (both 3M ESPE). Before and after thermal cycling and mechanical loading (TCML: 6000x5 /55C, H20, 2min. each cycle, 1.2*106x50N) the marginal adaptation was determined using scanning electron microscopy on resin replica. Microleakage was assessed at the cervical margins by a dye penetration test after TCML (0.5% fuchsine sol., 16hrs). Statistics: Mann-Whitney-U-test (p=0.05).

Results:

Before/after TCML

Margin: Variolink 2 Panavia F Compolute RelyX Unicem
Perfect margin [%] cement/tooth 90.0/85.0 99.5/99.0 99.0/99.0 99.5/99.5

 

cement/crown

92.0/85.5 99.0/99.0 100.0/98.5 98.5/98.0
Microleakage [%] cement/tooth 76.5 0.0 3.0 0.0

 

cement/crownn

100.0 3.5 2.5 0.0

After stress simulation, all cements showed comparable good marginal adaptation to the CAD CAM ceramic Lava, only for Variolink II significantly lower parts of perfect margin and higher micro-leakage were found. For RelyX Unicem without bonding no differences were found in comparison to Compolute or Panavia F. Panavia F, Compolute and RelyX Unicem showed no limitation for the cementation of CAD-CAM ZrO2 FPDs.


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