Naslov
Optical identification of inaccuracies caused by improper handling on type IV gypsum casts

Autori
Deželić, Edita ; Illeš, Davor ; Valentić-Peruzović, Melita ; Alajbeg Ž., Iva

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts of 26th Annual Conference of Europeean Prosthodontioc Association / - Zagreb, 2002, 157-157

Skup
26th Annual Conference of Europeean Prosthodontioc Association

Mjesto i datum
Cavtat, Hrvatska, 26.09.2002. - 28.09.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
gypsum casts; mixing mistakes

Sažetak
Type IV gypsum (stone gypsum) is an essential material in prosthetic treatment. Improper handling can change hardness, expansion and compressive strength and it is the most common reason for inaccurate casts. In that case even the most perfect impressions will result in inadequate prosthetic treatment. Using optical instruments - digital camera (2, 5 million pixels) and digital microscope we tried to identify visual appearance of inadequate casts and relate it to specific causes. All casts were purred in highly controlled conditions, only one factor whose influence we tried to determine was changed during procedure. Most common mistakes are: outdated gypsum, wrong powder to water ratio, mixing without vacuum-mixer, purring without vibrator and etching by alginate acid. All that mistakes were visualised, easily recognized and categorized by using digital optical equipment. Visual key for identification of mistakes caused by improper handling is presented.

Izvorni jezik
Engleski

Znanstvena područja
Dentalna medicina

POVEZANOST RADA