Abstract:
OBJECTIVES:To compare the effects of four surface coating methods on resin to zirconia shear bond strength. MATERIAL AND METHODS:Eighty pre-sintered zirconia discs were prepared and randomly divided into five study groups according to the corresponding methods of surface treatments as follows: group C (control group, fully sintered without any surface treatment), group S (fully sintered and then sandblasted with silica coated alumina powder), group G (fully sintered and then coated with glazing porcelain followed by acid etching), group Si (pre-coated with silica slurry then fully sintered), and group Z (coated with zirconia particles and then fully sintered). The observation of surface morphology and elemental composition analysis were conducted by SEM and EDX. Self-adhesive resin cement stubs (diameter 3.6mm and height 3mm) were then bonded on the zirconia discs with a cylindrical shape. Both initial and artificial aged (including 30-day water storage, thermal cycling for 3000 and 6000 cycles) shear bond strengths were then evaluated. RESULTS:All the tested coating methods showed significantly higher shear bond strengths than the control group, in both dry and aged conditions. Group S produced the strongest initial zirconia/resin bonding (19.7MPa) and the control group had the lowest value (8.8MPa). However, after thermal cycling, group Z exhibited the highest mean value. All the samples in the control group failed in the thermal cycling. Both different coating methods (p<0.001) and various aging treatments (p<0.001) produced significant influence on resin-zirconia shear bond strength. CONCLUSIONS:A reliable and durable resin zirconia bonding is vital for the longevity of dental restorations. Silica coating might be a reliable way in enhancing adhesion between resin and zirconia.
journal_name
J Mech Behav Biomed Materauthors
Liu D,Pow EHN,Tsoi JK,Matinlinna JPdoi
10.1016/j.jmbbm.2013.12.011subject
Has Abstractpub_date
2014-04-01 00:00:00pages
300-309eissn
1751-6161issn
1878-0180pii
S1751-6161(13)00422-0journal_volume
32pub_type
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