Jacket crown
A jacket crown ( English jacket crown , English jacket "coat", also porcelain jacket crown ) is understood in dentistry as a tooth crown made of all-ceramic.
Because of its cosmetic naturalness when restoring a destroyed tooth and its high biocompatibility, it is known as the “crown of the crown”. In 1889, the American dentist Charles Henry Land registered the patent for the first all-ceramic crown. The preparation and laboratory production is very complex. In the mid-1960s, the jacket crown experienced a renaissance under John W. McLean . He developed a core material reinforced with aluminum oxide with comparatively high strength values. The main disadvantage was that a relatively large amount of tooth substance had to be ground away so that the jacket crown had sufficient material strength to reduce the susceptibility to breakage. As a result, the teeth were often devitalized. More recently, all-ceramic crowns have been made from synthetic zirconium .
Logan's crown
A porcelain case crown with a metal core in which a platinum pin is embedded, was named after its inventor, the American Marshall Logan , (Pennsylvania, 1844-1885), as Logan crown (Logan crown). The post crown is anchored with the post in the drilled root canal of a non-vital tooth. This replaced the wooden root posts that had been made until then and which naturally often broke.
Individual evidence
- ^ Charles Henry Land: The scientific adaptation of artificial dentures . archive.org
- ↑ Wolfgang Gernet, Reiner Biffar, Norbert Schwenzer, Michael Ehrenfeld: Dental prosthetics . Georg Thieme, 2011, ISBN 978-3-13-165124-2 , p. 68 ( google.com ).
- ↑ Saundra Goodman: Got Teeth? a Survivor's Guide: How to Keep Your Teeth Or Live Without Them! Dog Ear Publishing, 2007, ISBN 978-1-59858-299-4 , pp. 52 ( google.com ).
- ↑ dental fillings, crowns, and bridges . Medical discoveries; Retrieved December 7, 2014.