Corrosion and fracture analysis in screws of dental implants prostheses. New coatings

The oral cavity has some characteristics of high concentration in mineral salts, enzymes, proteins and cells, which modify the implant-abutment-prosthesis unity. The protection of the dental implant abutment screw for corrosion and the improvement in its structure are one of the keys of success in our new restorative treatment in the long term. The titanium and its alloys release to the oral medium ions, which are not thought to be health damaging. However, thanks to its resistance to corrosion due to the layer formed with inert oxide the layer remains constant. In spite of this fact, there are phenomena which produce fatigue striation. The increase in the amount of mechanic failure and the appearance of microcracks make us review old concepts. Mechanisms such as the protein absorptions and micro-cracks propagation of the structure produce corrosion phenomena which can result in failure. The use of silver and copper nanoparticles for the dental implant abutment screw coating inhibits partly the production of corrosion product and the increase of elements such as sulfur, chlorine and sodium, which are the products that increase the microcracks of the original machining of the screw.