title: [Dental reconstruction with non-precious metal screws and posts].
abstract: A short review of the current methods for restoring destroyed dental crowns by mechanical retentive elements. The causes leading to failure in such restorations are mentioned in a short review of literature. Main causes are corrosive changes in posts and screws anchored in root canals. This is why a special chapter deals with the problem of corrosion. A systematic enumeration of various corrosions in posts and screws is illustrated by a choice of clinical and radiological illustrations. The author's own metallurgical analytic investigations of the posts and screws available commercially allow to divide them into 4 typical nonprecious metal groups: Inox steel, cromium nickel steel, cromium nickel molybdene steel and brass alloys. The reasons for resistance to corrosion lie in the different metallographic structures and processing methods. Further investigations are finished and will be published later in this journal.
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003343:Corrosion; D003442:Crowns; D003722:Dental Alloys; D003772:Dental Pins; D003793:Dental Restoration, Permanent / Q000379:methods*; D004570:Electrogalvanism, Intraoral; D006801:Humans; D008669:Metallurgy; D010519:Periodontium / Q000033:anatomy & histology; D011176:Post and Core Technique; D012389:Root Canal Obturation; D012391:Root Resorption; D013499:Surface Properties; D014070:Tooth / Q000033:anatomy & histology
chemical_list: D003722:Dental Alloys
vernacular_title: Zahnaufbauten mit nichtedelmetallhaltigen Schrauben und Stiften.