ObjectiveThis study evaluated the effect of three metal conditioners on the shear bond
strength (SBS) of a prosthetic composite material to cpTi grade I having three
surface treatments. Material and MethodsOne hundred sixty eight rivet-shaped specimens (8.0x2.0 mm) were cast and
subjected to polishing (P) or sandblasting with either 50 mm (50SB) or 250 mm
(250SB) Al2O3. The metal conditioners Metal Photo Primer
(MPP), Cesead II Opaque Primer (OP), Targis Link (TL), and one surface
modification system Siloc (S), were applied to the specimen surfaces, which were
covered with four 1-mm thick layers of resin composite. The resin layers were
exposed to curing light for 90 s separately. Seven specimens from each
experimental group were stored in water at 37ºC for 24 h while the other 7
specimens were subjected to 5,000 thermal cycles consisting of water baths at 4ºC
and 60ºC (n=7). All specimens were subjected to SBS test (0.5 mm/min) until
failure occurred, and further 28 specimens were analyzed using scanning electron
microscope (SEM) and X-ray energy-dispersive spectroscopy (EDS). Data were
analyzed by 3-way ANOVA followed by post-hoc Tukey's test
(α=0.05). ResultsOn 50SB surfaces, OP groups showed higher SBS means than MPP (P<0.05), while no
significant difference was found among OP, S, and TL groups. On 250SB surfaces, OP
and TL groups exhibited higher SBS than MPP and S (P<0.05). No significant
difference in SBS was found between OP and TL groups nor between MPP and S groups.
The use of conditioners on 250SB surfaces resulted in higher SBS means than the
use of the same products on 50SB surfaces (P<0.05). ConclusionSandblasting associated with the use of metal conditioners improves SBS of resin
composites to cpTi.