Galvanic corrosion behavior of titanium implants coupled to dental alloys

The corrosion of five materials for implant suprastructures (cast-titanium, machined-titanium, gold alloy, silver-palladium alloy and chromium-nickel alloy), was investigated in vitro, the materials being galvanically coupled to a titanium implant. Various electrochemical parameters E(CORR), i(CORR) Evans diagrams, polarization resistance and Tafel slopes) were analyzed. The microstructure of the different dental materials was observed before and after corrosion processes by optical and electron microscopy. Besides, the metallic ions released in the saliva environment were quantified during the corrosion process by means of inductively coupled plasma-mass spectrometry technique (ICP-MS). The cast and machined titanium had the most passive current density at a given potential and chromium-nickel alloy had the most active critical current density values. The high gold content alloys have excellent resistance corrosion, although this decreases when the gold content is lower in the alloy. The palladium alloy had a low critical current density due to the presence of gallium in this composition but a selective dissolution of copper-rich phases was observed through energy dispersive X-ray analysis.

Metallic ion release in artificial saliva of titanium oral implants coupled with different metal superstructures

In this work the metallic ion release in oral implants with superstructures of different metals and alloys used in clinical dentistry has been determined. This study has been realized in a saliva environment at 37 degrees C. The measurements of the ion release were carried out by means of the Inductively Coupled Plasma Mass Spectrometry technique. The titanium oral implant coupled with a chromium-nickel alloy releases a high quantity of ions and the implant coupled with the titanium superstructure presents a low value of ion release.

Dentures for a 3-yr-old child with ectodermal dysplasia: case report

A case of a 3-year-old boy with X-linked hypohidrotic ectodermal dysplasia is presented. Complete maxillary and mandibular dentures were made at 3 years and 2 months of age. The process for making the dentures is described. Obtaining enough patient cooperation and proper application of behavioral management techniques are critical factors for the procedure described in the article.

Cephalometric changes in a patient with ectodermal dysplasia after placement of dentures

The purpose of this article is to analyze the changes observed in a three-year-old boy affected of ectodermal dysplasia after the placement of complete dentures. Esthetic, functional as well as cephalometric changes are discussed.