Abstract
The aim of this study was to analyze the shear bond strength between commercially pure titanium, with and without laser welding, after airbone-particle abrasion (Al(2)O(3)) and 2 indirect composites. Sixty-four specimens were cast and divided into 2 groups with and without laser welding. Each group was divided in 4 subgroups, related to Al(2)O(3) grain size: A - 250 microm; B - 180 microm; C- 110 microm; and D - 50 microm. Composite rings were formed around the rods and light polymerized using UniXS unit. Specimens were invested and their shear bond strength at failure was measured with a universal testing machine at a crosshead speed of 2.0 mm/min. Statistical analysis was carried out with ANOVA and Tukey's test (alpha=0.05). The highest bond strength means were recorded in 250 microm group without laser welding. The lowest shear bond strength means were recorded in 50 microm group with laser welding. Statistically significant differences (p<0.05) were found between all groups. In conclusion, airborne particle abrasion yielded significantly lower bond strength as the Al(2)O(3) particle size decreased. Shear bond strength decreased in the laser welded specimens.
Highlights
The use of titanium and its alloys for cast restorations and partial denture frameworks has increased substantially over the last years, because of their excellent biocompatibility, corrosion resistance, high strength-to-weight ratio, and low cost [1,2]
The current study evaluated the bond strength of two indirect composite/adhesive systems to commercially pure titanium subjected to different particle sizes of airborne aluminum oxide (Al2O3) abrasion after laser welding
Tukey test showed that composites, laser welded, and airborne-particle abrasion protocol in commercially pure titanium (CpTi) rods exhibited significant influence on the mean shear bond strength values (p
Summary
The use of titanium and its alloys for cast restorations and partial denture frameworks has increased substantially over the last years, because of their excellent biocompatibility, corrosion resistance, high strength-to-weight ratio, and low cost [1,2]. This trend can be mainly attributed to the development of casting technology for titanium alloys, such as new casting machines, investment materials and the extensively reported advantages of titanium over other base metal alloys [1,2]. Retention of indirect composites for fixed prosthesis and crowns to metal frameworks can be obtained by micromechanical (air-abrasion, electrolytic etching, porous metal coating), macromechanical (mesh, beads, rough surface with particles) and chemical
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