Title: 0255 - Bond-strength Between Frameworks and Gingiva-colored Materials Used in Implant-supported Hybrid-prosthesis
Fatma Uslu (Presenter)
Yurdanur Ucar, Cukurova University College of Dentistry
Objectives: The purpose of this pilot in vitro study was to compare shear bond strength between two different gingiva-colored materials bonded to Co-Cr alloy discs and zirconia discs.
Methods: Laser sintered Co-Cr alloy (EOS Co-Cr SP-2, EOS) and pre-sintered zirconia (IPS e.max ZirCAD, Ivoclar) discs with dimensions of 25 mm×3 mm were prepared. SiC papers were used for wet grinding. Specimens were subjected to AlO2 sandblasting and treated with ultrasonic cleaning using 90% alcohol, kept in room temperature distilled water for 15 minutes. Specimens in both groups were pre-treated using primer (Clearfil Ceramic Primer, Kuraray) and resin cement (Panavia Fluora Cement, Kuraray). Opaque (Ceramage Pre Opaque, Kuraray) was applied only on Co-Cr specimens. The specimens per group were subdivided in two groups. Gingiva colored composite material (Gradia Gum Shades, GC) was applied on half of the specimens while pink porcelain (IPS e.max Ceram, Ivoclar) was applied on the rest in both groups. Shear bond strength was measured in a universal testing machine. Data was analyzed using one-way ANOVA, two-way ANOVA and t-test (α=.05).
Results: Both framework and gingiva material significantly affected the bond strength. The mean (±SD) bond strength of zirconia groups (7.5±3.4 MPa) was significantly lower than Co-Cr groups (9.7±5.3 MPa). Similarly, the mean (±SD) bond strength of porcelain specimens (11.0±4.3 MPa) was significantly higher than the composite specimens (5.5±2.2 MPa). A statistically significant difference was also found between all four subgroups (framework*gingiva material). Metal-porcelain group (14.0±3.8 MPa) showed the highest bond strength value, followed by zirconia-porcelain (9.0±3.3 MPa), zirconia-composite (5.7±2.5 MPa) and metal-composite (5.3±1.8 MPa) groups.
Conclusions: Selection of framework and gingiva materials when constructing implant supported hybrid restorations is critical since both factors affect the bond strength.
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE