Abstract
Dental implants have increased the use of titanium and titanium alloys in prosthetic applications. Whitening toothpastes with peroxides are available for patients with high aesthetic requirements, but the effect of whitening toothpastes on titanium surfaces is not yet known, although titanium is prone to fluoride ion attack. Thus, the aim of the present study was to compare Ti-5Ta alloy to cp Ti after toothbrushing with whitening and conventional toothpastes. Ti-5Ta (%wt) alloy was melted in an arc melting furnace and compared with cp Ti. Disks and toothbrush heads were embedded in PVC rings to be mounted onto a toothbrushing test apparatus. A total of 260,000 cycles were carried out at 250 cycles/minute under a load of 5 N on samples immersed in toothpaste slurries. Surface roughness and Vickers microhardness were evaluated before and after toothbrushing. One sample of each material/toothpaste was analyzed by Scanning Electron Microscopy (SEM) and compared with a sample that had not been submitted to toothbrushing. Surface roughness increased significantly after toothbrushing, but no differences were noted after toothbrushing with different toothpastes. Toothbrushing did not significantly affect sample microhardness. The results suggest that toothpastes that contain and those that do not contain peroxides in their composition have different effects on cp Ti and Ti-5Ta surfaces. Although no significant difference was noted in the microhardness and roughness of the surfaces brushed with different toothpastes, both toothpastes increased roughness after toothbrushing.
Highlights
Pure titanium has been used for dental prosthesis frameworks because of its many advantages, including biocompatibility, corrosion resistance, low density and mechanical properties.[1]
Interest in the Ti-Ta alloy has increased mainly because the Ta2O5 passive layer created at the Ti-Ta alloy surface is more stable than the TiO2 found at the Commercially pure titanium (cp Ti) surface, which improves corrosion resistance and biocompatibility
The surface roughness of samples increased significantly after toothbrushing (p < 0.05), but no differences were noted between cp Ti and Ti-5Ta brushed with Rembrandt Deeply White (REM) or Sorriso Dentes Brancos (SOR) (p = 0.320)
Summary
Pure titanium (cp Ti) has been used for dental prosthesis frameworks because of its many advantages, including biocompatibility, corrosion resistance, low density and mechanical properties.[1]. The corrosion resistance, biocompatibility, mechanical properties and wear resistance of Ti-Ta (titanium-tantalum) alloys have been studied.[3,4,5,6] Interest in the Ti-Ta alloy has increased mainly because the Ta2O5 (tantalum oxide) passive layer created at the Ti-Ta alloy surface is more stable than the TiO2 (titanium oxide) found at the cp Ti surface, which improves corrosion resistance and biocompatibility.
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