Indiana University-Purdue University Indianapolis (IUPUI) / BACKGROUND: Phosphoric acid treatment has been reported to be relevant for
zirconia cleaning after contamination. However, its interaction with different primers is
not well known and needs to be investigated. OBJECTIVES: To compare the shear bond
strengths (SBS) of resin cement to Y-TZP after phosphoric acid pretreatment and
different chemical conditioning protocols, and to test the durability of SBSs after long
term storage and thermal cycling conditions. To investigate the effect of phosphoric acid
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on the surface roughness of a yttrium-stabilized tetragonal zirconia polycrystal ceramic
(Y-TZP). METHODS: Sixty bars of zirconia (30 X 5 X 2 mm) were polished and glued
to acrylic tubes. Each bar received 3 different surface treatments (control, phosphoric
acid and air-abrasion). The bars were randomly assigned into five groups according to
different primers applied (No primer, Clearfil ceramic primer, Monobond Plus, Z-prime
plus and AZ primer). After that, resin cement was mixed, injected into a mold, and light
cured. The specimens were tested in shear on a universal testing machine. Half of the
specimens were tested after 24 h water storage and the other half were tested after 90
days of water storage and thermocycling. Non-contact profilometer was used to assess
the effect of the three surface pretreatments on surface roughness of zirconia. Mode of
failure and surface roughness were evaluated with SEM. Statistical analyses were
conducted with mixed-model ANOVA and chi-square tests. RESULTS: The results
indicated that Monobond Plus primer showed higher SBS after phosphoric acid
treatment compared to other primers used. SBS of all air abrasion groups were higher
than phosphoric acid groups. Long term water storage and thermocycling led to a
statistically significant decrease in SBS for all groups except Monobond Plus, Z-prime
plus and AZ primer after air abrasion treatment. Surface roughness measurements showed
no significant differences among the surface treatments. CONCLUSION: Monobond Plus
provided the highest SBS to zirconia after phosphoric acid treatment. The findings
suggest that the air abrasion is the best surface treatment after contamination of zirconia
surface. Monobond Plus, Z-prime plus and AZ primer showed durable SBS after air
abrasion treatment and aging process.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/7079 |
| Date | January 2015 |
| Creators | Alshehri, Eman Zuhair |
| Contributors | Platt, Jeffrey A., Bottino, Marco C., Chu, Tien-Mien Gabriel, Lund, Melivin R., Cochran, Michael A. |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
| Rights | Attribution-NonCommercial-NoDerivs 3.0 United States, http://creativecommons.org/licenses/by-nc-nd/3.0/us/ |
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