Adhesive restorations: comparative evaluation between the adhesion of the glass-ceramics to the composite cement and the adhesion of the ceromer to the composite cement.
OBJECTIVE
The aim of this work is to compare the adhesion of the glass-ceramic (empress II) to the composite cement and the adhesion of the ceromer to the composite cement.


METHODS
From each of the above materials, 10 little blocks, of 8 x 6 x 2 mm size, have been prepared. All the surface treatments suggested by the manufacturing industry have been performed: sandblasting and acid-etching of the ceramic, ceromer surface roughening with diamond bur and silanization and bonding application on both materials. A homogeneous layer of cement has been placed between couples of blocks of the same material and photopolymerised. Every sample, consisting of 2 bonded blocks, has been submitted to a traction force on a universal test machine connected with a computerized measure system (SINTEC D/10). Samples have been anchored to the machine binding devices by a bicomponent epoxy glue. Data on the breaking charge have been recorded and an analysis of the broken surfaces has been performed in order to classify the breaking modalities.


RESULTS
The results ontained showed that the composite-glass-ceramic adhesion force (mean value 64 Mpa) was remarkably higher than the composite-ceromer adhesion (mean value 37.21 Mpa).


CONCLUSIONS
The analysis of the broken surfaces by SEM showed that a mixed fracture occurred in all samples (both partly adhesive and cohesive).
Ceruti
P
P
Section of Dentistry and Dental Prosthetics, School of Restoration Dentistry, University of Turin, Turin, Italy. cer_paola@yahoo.it
Erovigni
F
F
Casella
F
F
Lombardo
S
S
D002516:Ceramics; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D008422:Materials Testing
D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; C111841:ceromer; C023506:Glass ceramics