Title Staklenoionomerni cementi Author Ivan Vukšić Mentor Ivana Brekalo Pršo (mentor)Granter University of Rijeka Defense date and country 2010, Croatia Scientific / art field, BIOMEDICINE AND HEALTHCARE Abstract Staklenoionomerni cementi (SIC) su dvokomponentni sustavi sastavljeni od praha i tekućeg dijela. To su cementi koji nastaju kao produkt kiselinsko – bazne reakcije između kiselog polimera i bazičnog stakla. Samo ako su zadovoljene sve tri komponente definicije (kiseli polimer, staklo i kiselinsko – bazna reakcija) takav materijal jest SIC.
Tekućina SIC je 47.5% vodena otopina nekoliko kiselina: poliakrilne kiseline, kopolimera itakonske kiseline i tartarne kiseline.
Prašak je
... More aluminosilikatno staklo s visokim udjelom fluora, odnosno kalcijsko-aluminijski-fluoro-silikat (SiO2 – Al2O3 – AlF – CaF2 – NaF – AlPO4 – NaAlF6).
SIC je klasificiran s obzirom na fizikalno mehanička svojstva (tip I, II i III) i kemijska svojstva (konvencionalni samostvrdnjavajući SIC, visoko viskozni SIC, metalima pojačani SIC, smolom modificirani SIC, svjetlom aktivirani samostvrdnjavajući SIC, akrilatom pojačani samostvrdnjavajući SIC, brzostvrdnjavajući SIC).
Reakcija stvrdnjavanja je složena kemijska reakcija koja ovisi o sastavu i veličini čestica praška kao i o sastavu, molekulskoj težini i koncentraciji tekućine. Za ispravan tijek reakcije bitan je točan omjer praška i tekućine, prema uputi proizvođača.
Zbog bolje adhezije i kemijskog svezivanja SIC za tvrda zubna tkiva potrebno je površinu zuba kondicionirati. U tu svrhu koristi se 10 –25% poliakrilna kiselina.
Svježe zamiješani cement nanosi se na površinu zuba, u pravilu, instrumentima od plastike (sondom ili malim nabijačem). Metalni se instrumenti ne preporučuju zbog ionizacije.
Ukoliko je SIC materijal za trajni ispun, konvencionalne SIC obavezno zaštićujemo od vlage ili isušivanja lakom.
Ključne riječi: dentalni cementi, otpuštanje fluorida, restaurativni materijal, smolom modificirani staklenoionomerni cement, staklenoionomerni cement, strukturna podloga. Less Abstract (english) Glass-ionomers (GIC) are two-component system consisting of powder and liquid parts. These are cements, which occur as a product of the acid - base reaction between acidic and basic polymer glass.
Only if they met all three definitions (an acidic polymer, glass and acid – base reaction), such material is GIC. Liquid GIC is 47.5% water solution of several acids (poliakril acid, itaconic acid copolymer and tartar acid.)
Powder is aluminosilicat glass with high fluorine or
... More calcium-aluminum-fluoro-silicate (SiO2 - Al2O3 - ALF - CaF2 - NaF - AlPO4 - NaAlF6).
GIC is classified with respect to physical and mechanical properties (type I, II and III) and chemical properties of a conventional GIC, highly-viscous GIC, metal-reinforced GIC, resin- modified GIC, light- activated self-curing GIC, resin-reinforced self-curing GIC, rapid self-curing GIC.
Curing reaction is a complex chemical reaction that depends on the composition and size of the powder particles as well as composition, molecular weight and concentration of liquids.
For correct course of reaction it is essential to have correct ratio of powder and liquid, according to the manufacturer's instructions. For better adhesion and chemical svezivanja GIC for hard tissues, tooth surface should be conditioned. For this purpose we use 10 -25% poliakril acid. Freshly mixed cement is applied to the tooth surface, with plastic instruments (a probe or a small compactor).
Metal instruments are not recommended due to ionization. If the GIC material is for permanent restoration, the conventional GIC is protected from moisture or drying varnish. Less Keywords
dentalni materijali
dentalni cementi
staklenoionomerni cementi
Keywords (english)
core material
dental cement
fluoride release
glass-ionomer cement
resin- modified cement
restorative material.
Language croatian URN:NBN urn:nbn:hr:184:081182 Study programme Title: Dental Medicine Type of resource Text File origin Born digital Access conditions Access restricted to students and staff of home institution Terms of use Created on 2016-04-21 11:56:30
