Ions release Evaluation and Changes in Mini-implant Orthodontic Surface

Abstract

The knowledge of the physical/chemical state of corrosion products released in the oral cavity is very important for the toxicological assessment of metal alloys used in dental miniscrews.

Corrosion and Micromorphological Analysis of Temporary Stainless Steel and Titanium Alloy Anchorage Devices

“…The performance of the alloys during immersion in an acidic fluoride-containing solution confirmed their good resistance to pitting corrosion on their surface, in the form of a spontaneous passive film, since no ion release was observed after 30 days of immersion in artificial saliva. Similar results were found by Huang et al [29] when evaluating a titanium alloy in artificial saliva containing fluoride, and by Suzuki et al [19] after 120 days of immersion.…”

“…Some recent studies have shown that titanium alloys (TADs) may be considered corrosion-resistant [16][17][18], in compliance with the biosafety standards of alloys for human use [19], based on the stability of the passive titanium oxide layer on their surface [20]. However, Pavlic et al [21] showed that chlorhexidine increased the roughness of stainless steel mini-implants, whose mechanism is associated with pit corrosion and may cause the release of some ions from the material to the solution.…”

Corrosion Behavior and In Vitro Cytotoxicity of Ni–Ti and Stainless Steel Arch Wires Exposed to Lysozyme, Ovalbumin, and Bovine Serum Albumin

“… 5 Research has shown that nickel or its compounds could cause hypersensitivity, dermatitis, or asthma, so there exists the possibility that corrosion products of nickel released from orthodontic arch wires or brackets might elicit side reactions. 6 , 7 …”

Corrosion resistance and surface characterization of miniscrews removed from orthodontic patients

“…[2][3] Commercially pure titanium (Ti cp), the titanium-aluminium-vanadium alloy (Ti6Al4V) and surgical stainless steel have been used as raw materials for some biomaterials, as in the case of orthodontic mini-implants. [4][5][6][7][8] Studies have compared these materials and concluded that the Ti6Al4V alloy offers advantages over surgical stainless steel because of its improved biocompatibility, high bacteriostatic action and high resistance to corrosion, which is attributed to the formation of a protective layer of titanium dioxide (TiO 2 ). 5,[8][9][10][11] Compared to Ti cp, the Ti6Al4V alloy offers the advantage of having greater mechanical resistance, but is less corrosion-resistant.…”

“…[4][5][6][7][8] Studies have compared these materials and concluded that the Ti6Al4V alloy offers advantages over surgical stainless steel because of its improved biocompatibility, high bacteriostatic action and high resistance to corrosion, which is attributed to the formation of a protective layer of titanium dioxide (TiO 2 ). 5,[8][9][10][11] Compared to Ti cp, the Ti6Al4V alloy offers the advantage of having greater mechanical resistance, but is less corrosion-resistant. 5,[9][10][11][12] In general, biomaterials must present some specific features, such as biocompatibility and corrosion resistance, to be used in the human organism.…”