Methods of Tooth Preparation for Fixed Prosthetic Work Depending on the Ceramic Material

Brušenje je ireverzibilno uklanjanje tvrdog zubnog tkiva da bi se stvorio prostor za budući fiksnoprotetski nadomjestak. Kada je brušenje indicirano, potrebno je preparirati zub u skladu s estetskim, mehaničkim i biološkim načelima. Potpuno keramičkim materijalima započelo je novo razdoblje estetske fiksne protetike. Keramičke materijale dijelimo na gliničnu keramiku, keramiku s udjelom stakla i oksidnu keramiku. Terapijski nadomjesci od potpuno keramičkih materijala su krunice, estetske ljuske, inlay, onlay i overlay. Njihova indikacija je, osim estetske, protektivna, profilaktička i protetska. Unazad par desetljeća pojavila se mogućnost računalnog dizajna i strojne izrade nadomjestaka iz keramičkih blokova. Postoje razlike u količini brušenja ovisno je li riječ o slojevanoj ili monolitnoj keramici, kao i u brušenju kod različite savojne čvrstoće. Zaobljena stepenica indicirana je kod većine potpuno keramičkih materijala. Takvom preparacijom zuba štedi se na zubnoj strukturi, a opet se stvara dovoljno prostora za keramički materijal.Grinding is irreversible removing of hard dental tissue in order to create space for future fixed prosthetic work. When grinding is indicated it is necessary to prepare the tooth in accordance to aesthetic, mechanical and biological principles. With all-ceramic materials a new period of aesthetic fixed prosthetics has begun. The ceramic materials are divided into feldspathic, glass-ceramics and oxide ceramics. Therapeutic substitutes made of all-ceramic material include crowns, aesthetic veneers, inlay, onlay and overlay. Their indications are, apart from aesthetic, protective, prophylactic and prosthetic. The possibility of computer aided design and manufacturing of prosthetic work out of ceramic blocks appeared a few decades ago. There are differences in the amount of grinding depending on whether layered or monolithic ceramics are used, as well as in grinding at different flexural strengths. A rounded chamfer margin is indicated in the majority of all-ceramic materials. This kind of a tooth preparation saves on the dental structure, yet creating enough space for the ceramic material