Evaluation of shear bond strength between dual cure resin cement and zirconia ceramic after thermocycling treatment.
OBJECTIVE
This study was performed to evaluate shear bond strength (SBS) between three dual-cured resin cements and silica coated zirconia, before and after thermocycling treatment.


METHODS
Sixty specimens were cut in 15 × 2.75 mm discs using zirconia. After air blasting of 50 µm alumina, samples were prepared by tribochemical silica coating with Rocatec™ plus. The specimens were divided into three groups according to the dual-cure resin cement used: (1) Calibra silane+Calibra®, (2) Monobond S+Multilink® N and (3) ESPN sil+RelyX™ Unicem Clicker. After the resin cement was bonded to the zirconia using a Teflon mold, photopolymerization was carried out. Only 10 specimens in each group were thermocycled 6,000 times. Depending on thermocycling treatment, each group was divided into two subgroups (n=10) and SBS was measured by applying force at the speed of 1 mm/min using a universal testing machine. To find out the differences in SBS according to the types of cements and thermocycling using the SPSS, two-way ANOVA was conducted and post-hoc analysis was performed by Turkey's test.


RESULTS
In non-thermal aged groups, SBS of Multilink group (M1) was higher than that of Calibra (C1) and Unicem (U1) group (P<.05). Moreover, even after thermocycling treatment, SBS of Multilink group (M2) was higher than the other groups (C2 and U2). All three cements showed lower SBS after the thermocycling than before the treatments. But Multilink and Unicem had a significant difference (P<.05).


CONCLUSIONS
In this experiment, Multilink showed the highest SBS before and after thermocycling. Also, bond strengths of all three cements decreased after thermocycling.
Department of Dental Prosthodontics and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea.
Jung-Jin
JJ
Lee
Department of Dental Prosthodontics and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea.
Cheol-Kyun
CK
Kang
Department of Dental Prosthodontics and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea.
Ju-Won
JW
Oh
Department of Dental Prosthodontics and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea. ; Research Institute of Clinical Medicine Chonbuk National University-Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
Jae-Min
JM
Seo
Department of Dental Prosthodontics and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea. ; Research Institute of Clinical Medicine Chonbuk National University-Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
Ju-Mi
JM
Park
Resin cement; Shear bond strength; Silica coating; Thermocycling treatment; Y-TZP zirconia