Keywords
zirconia
cobalt chrome
shear force
adhesive strength
pink aesthetic
smile
How to Cite
Abstract
The objective of this study is to compare the resistance to shear forces of two pink composite materials (Gradia® gum shades) and (SR Nexco®) bonded to two different substrates: one being zirconia and the other a substrate metal complex represented by Cr-Co. Forty square samples were used for this study, twenty samples of Cr-Co and twenty samples of zirconia. Each of the 2 groups of samples was randomly subdivided into 2 subgroups (Group I and GC group), each consisting of 10 samples.
Each sub-group received two types of gingival colored composite: Gradia® gum shades and SR Nexco®. A universal test machine (YL-01), with a load of 10kN, a speed of 1 mm / min and a flat insert, was used to apply shear forces to the substrate-composite resin interface.
The shear forces at the breaking point were recorded in Newtons and then calculated in MPa. For SR Nexco®, mean shear strength was significantly higher when
the base was metal (7,142 ± 2.54) compared to the Zirconia base (5.09 ± 1.44) (p = 0.022). For Gradia® gum shades, no significant difference between the two
bases was observed (p = 0.348). Mean shear strength was higher with SR Nexco® compared to Gradia® gum shades for both groups of Cr-Co samples (p = 0.029)
and zirconia (p = 0.047). Repair or manufacture of implant prostheses using composite resins, gingival colored, is a viable alternative. The prognosis is best
when the pink composite is applied to the metal.