Bond strength of three luting agents to zirconia ceramic - influence of surface treatment and thermocycling |
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Authors: | Attia Ahmed |
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Institution: | Department of Conservative Dentistry and Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt. aattia@mans.edu.eg |
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Abstract: | ObjectiveThis in vitro study aimed to evaluate the influence of
different surface treatments, 3 luting agents and thermocycling on
microtensile bond strength (µTBS) to zirconia ceramic. Material and MethodsA total of 18 blocks (5x5x4 mm) were fabricated from zirconia ceramic (ICE
Zirkonia) and duplicated into composite blocks (Alphadent). Ceramic blocks
were divided into 3 groups (n=6) according to the following surface
treatments: airborne-particle abrasion (AA), silica-coating, (SC) (CoJet)
and silica coating followed by silane application (SCSI) (ESPE Sil). Each
group was divided into 3 subgroups (n=2) according to the 3 luting agents
used. Resin-modified glass-ionomer cement (RMGIC, Ketac Cem Plus),
self-adhesive resin cement (UN, RelyX Unicem) and adhesive resin cement (ML,
MultiLink Automix) were used for bonding composite and zirconia blocks. Each
bonding assembly was cut into microbars (10 mm long and 1±0.1
mm2). Seven specimens of each subgroup were stored in water bath
at 37ºC for 1 week. The o ther 7 specimens were stored in water bath at 37ºC
for 30 days then thermocycled (TC) for 7,500 cycles. µTBS values were
recorded for each specimen using a universal testing machine. Statistical
analyses were performed using a 3-way ANOVA model followed by serial 1-way
ANOVAs. Comparison of means was performed with Tukey''s HSD test at (α=0.05).
ResultsµTBS ranged from 16.8 to 31.8 MPa after 1 week and from 7.3 to 16.4 MPa after
30 days of storage in water and thermocycling. Artificial aging
significantly decreased µTBS (p<0.05). Considering surface treatment,
SCSI significantly increased µTBS (p<0.05) compared to SC and AA. Resin
cements (UN and ML) demonstrated significantly higher µTBS (p<0.05)
compared to RMGIC cement. ConclusionsSilica coating followed by silane application together with adhesive resin
cements significantly increased µTBS, while thermocycling significantly
decreased µTBS. |
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Keywords: | Ceramics Surface treatment Resins Bond strength |
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