| Abstract | Doktori dentalne medicine svakodnevno se susreću s djelomično bezubim pacijentima. Jedna od mogućnosti sanacije djelomične bezubosti uključuje sustave dvostrukih krunica koji retiniraju djelomične proteze, pokrovne proteze ili mostove na skidanje. Dvostruke krunice patentirao je dr. J.B. Beers 1873. godine, a mogu se podijeliti na teleskopske, konusne, rezilijentne te modificirane dvostruke krunice. Njihova uporaba indicirana je u slučajevima kada pacijent ima malo preostalih ili nepovoljno raspoređenih zuba nosača, kada se zubi trebaju okruniti zbog destruiranosti krune te u slučajevima okluzalne rekonstrukcije. Dvostruke krunice također se mogu koristiti za povezivanje prirodnih zuba i implantanata, a osim toga mogućnost skidanja matrice omogućava jednostavno održavanje higijene što dvostruke krunice čini povoljnima za korištenje kod pacijenata koji nisu manualno spretni. Tradicionalno se za izradu dvostrukih krunica koristilo zlato i njegove legure, koje su zbog cijene kasnije zamijenile nikal krom i kobalt-krom legure. Modernizacijom stomatologije i dolaskom računalno potpomognutog dizajna i računalno potpomognute proizvodnje (CAD/CAM) na tržište dolaze novi materijali dostupni za glodanje. Ovi moderni materijali podrazumijevaju kobalt-krom legure koje se u današnje vrijeme također mogu glodati, zatim titan i njegove legure, cirkonij te polieter-eter-keton (PEEK). Izrada dvostrukih krunica vrlo je složena, potrebni su mnogi klinički i laboratorijski koraci koji zahtjevaju visoku preciznost, vještinu i iskustvo kako doktora dentalne medicine tako i dentalnog tehničara koji izrađuje rad. |
| Abstract (english) | In their everyday practice, dentists frequently encounter partially edentulous patients. One treatment option for partial edentulism involves double crown systems, which retain partial dentures, overdentures, or removable bridges. Double crowns, patented by Dr. J.B. Beers in 1873, can be categorized into telescopic crowns, conical crowns, resilient double crowns, and modified double crowns. Their use is indicated in cases where the patient has few remaining teeth, when the remaining teeth are unfavorably positioned, when crowns are needed due to severe destruction, and in cases of occlusal reconstruction. Double crowns can also be employed to connect natural teeth with implants, and the removable matrix allows for easy hygiene maintenance, making double crowns particularly advantageous for patients with limited manual dexterity. Traditionally, gold and its alloys were used in the production of double crowns; however, due to cost considerations, these were later replaced by nickel-chromium and cobalt-chromium alloys. With the modernization of dentistry and the advent of computer-aided design and computer-aided manufacturing (CAD/CAM), new materials suitable for milling have become available. These contemporary materials include cobalt chromium alloys, which can now be milled, as well as titanium and its alloys, zirconium, and polyether ether ketone (PEEK). The design and fabrication of double crowns is a highly complex process, involving numerous clinical and laboratory steps that demand exceptional precision, skill, and experience from both the dentist and the dental technician responsible for creating the final crown. |
