3 research outputs found
A Method for Testing Abrasive Wear of Aesthetic Prosthetic Materials
Trenje i troÅ”enje zbivaju se na dodiru tvarnih povrÅ”ina koje su viÅ”e ili manje hrapave. Tijekom abrazijskoga troÅ”enja nastaje istiskivanje materijala prouzroÄenog tvrdim Äesticama koje prave pritisak prema povrÅ”ini, ili kližu duž nje (trotoÄkasto abrazijsko troÅ”enje), ili pak tvrdim izboÄinama (dvotoÄkasto abrazijsko troÅ”enje). Zahtjevi za estetskom opskrbom grizne plohe postavljaju pred kliniÄara problem izbora materijala za fasetiranje.
U ovome Älanku opisana je metoda za ispitivanje abrazijskoga tro- Å”enja parova zub-protetski materijal za fasetiranje. Da bi se ocijenila ta metoda ispitana su dva razliÄita protetska materijala za fasetiranje (polimerni materijal SR Chromasit, Ivoclar i gliniÄna keramika, Sign Ivoclar) na modificiranom Taber abrazeru, u suhim uvjetima. Dobivene su znatne razlike u tragovima troÅ”enja na uzorcima ispitivanih materijala.
Testirana metoda omoguÄuje ispitivanje uzoraka razliÄitih materijala meÄusobno ili u paru s prirodnim zubom, pod razliÄitim optereÄenjima te s postojanjem treÄeg tijela ili bez njega (hrane ili umjetne sline), Å”to je u kliniÄkoj praksi vrijedan podatak pri izboru vrste konstrukcije i materijala za fasetiranje.Friction and wear occur due to the contact of surfaces which are more or less rough. During abrasive wear the extrusion of material occurs, caused by hard particles which apply pressure toward the surface or slide along it (three-body abrasive wear) or by hard protrusions (two-body abrasive wear). Because of demands to provide a satisfactory aesthetic mastication surface the clinician is faced with the problem of the choice of material for veneering.
The article describes a method for testing abrasive wear of pairs of tooth-prosthetic material for veneering. In order to test the method two different prosthetic veneering materials were tested (polymer material SR Chromasit, Ivoclar and Clay ceramic, Sign-Ivoclar) on a modified Taber abraser, in dry conditions. Significant differences were determined in the wear scars on specimens of the tested materials. The method enables the testing of specimens of different materials mutually or in a pair with a natural tooth, under different loading and with or without a third body (food or artificial saliva), which in clinical practice represents valuable data during the choice of the type of construction and veneering material
Wear Characteristics of Esthetic Prosthetic Materials
Poznavanje triboloÅ”kih svojstava estetskih protetskih materijala nužno je u svakodnevnoj stomatoloÅ”koj praksi. UsavrÅ”iti novu, originalnu, metodu i konstruirati ureÄaj za ispitivanje triboloÅ”kih svojstava gradivnih protetskih materijala, ispitati triboloÅ”ka svojstva razliÄitih estetskih protetskih materijala te ispitati meÄusobno ponaÅ”anje materijala triboloÅ”kog para: prirodan zub - protetski materijal. Istraživanje je raÄeno na modificiranom ureÄaju āTaber abraserā, na uzorcima Å”est razliÄitih estetskih protetskih materijala. TroÅ”enje je najmanje za uzorke gliniÄne keramike (Creation i d.Sign), a najveÄe za polimer (Chromasit) te ceromer (Targis). Najmanji faktori troÅ”enja odreÄeni su, takoÄer, za gliniÄne keramike. Istraživanje je rezultiralo razvojem nove metode i ureÄaja za ispitivanje triboloÅ”kih svojstava protetskih materijala.Knowledge of wear characteristics of esthetic prosthetic materials is essential in everyday dental practice. To establish a new, original, method and produce a device for examining wear characteristics of constructive prosthetic materials, to assess the wear characteristics of different esthetic prosthetic materials and to examine the relationship in a wear pair: natural tooth - prosthetic material. The study was performed on a modified device āTaber abraserā on samples of six different esthetic prosthetic materials. The wear is smallest for samples of alumina ceramics (Creation and d.Sign), and greatest for polymer (Chromasit) and ceromer material (Targis). The smallest wear factors were established for alumina ceramics as well. The study has resulted in the development of a new method and new device for examining the wear characteristics of prosthetic materials