ABSTRACT
Objectives: To comparatively assess the micro shear bond strength (MSBS) of dentin bonded surface
pre-treated zirconia ceramics. Materials and Methods: Zirconia blocks were sectioned into 50 cubical blocks. The blocks were further categorized
into five groups (n = 10 each). Group I: No treatment was performed on zirconia samples; Group II: The
zirconia samples were sand-blasted; Group III: Group II + etched with 9.8% of hydrofluoric
(HF) acid for 60 s; Group IV: The sandblasted zirconia samples were selectively infiltrated
with low fusing porcelain; and Group V: Group IV + etched using 9.8% HF acid gel.
The zirconia specimens were then bonded to dentin samples, and the samples were tested
for MSBS evaluation using universal testing machine. Results: The MSBS of all the four experimental groups shows greater value than group I. Among
the experimental groups, group V and group IV do not show any statistical significant
difference, whereas the mean MSBS of groups IV and V were statistically greater than
group III and group II. However, groups I, II, and III do not show any statistical
significant difference in mean MSBS values between them. Conclusion: Selective infiltration etching of zirconia ceramics provides the highest bond strength
with resin cement.
Key words:
Hydrofluoric acid etching - sandblasting - selective infiltration etching - Zirconia
blocks
