Izvorni znanstveni članak
Influence of the Kevloc Bonding System on the Metal-polymer Interface
Denis Vojvodić
; Zavod za fiksnu protetiku, Zagreb, Hrvatska
Vjekoslav Jerolimov
; Zavod za mobilnu protetiku Stomatološkog fakulteta Sveučilišta u Zagrebu, Zagreb, Hrvatska
Adnan Ćatović
; Zavod za fiksnu protetiku, Zagreb, Hrvatska
Ante Lončar
; DZ Cmomerec, Zagreb, Hrvatska
Šuhreta Husić
; Fakultet strojarstva i brodogradnje Sveučilišta u Zagrebu, Zagreb, Hrvatska
Janez Indof
; Fakultet strojarstva i brodogradnje Sveučilišta u Zagrebu, Zagreb, Hrvatska
Biserka Lazić
; Zavod za fiksnu protetiku, Zagreb, Hrvatska
Sažetak
Polymerization contraction o f veneering material, different coefficients o f thermal expansion and different coefficients o f volume expansion in water of polymers and metals cause marginal gap formation on the metal-polymer interface with all the well known, consequences (veneer detachment, egsogene discoloration).The occurrence o f a marginal gap can be avoided by the application of a modern bonding system, which also reinforces of the bond strength between the polymer veneer and the metal surface. The aim of this study was to determine bond strengths obtained after application o f the Kevloc bonding system on two dental alloys (Ag- -Pd, Co-Cr) and to compare them with the results o f a control group, simulating common procedure in the dental laboratory. A light microscope with computerized image analyzer was used to reveal existence of the marginal gap after Kevloc bonding system had been applied. Six ty- six specimens were tested with shear test after polymerization and ageing treatments (immersion in water temperature 37 °C and thermocycling), and one specimen from each investigated group was analyzed by the use o f a microscope.Kevloc bonding system improved bond strength values on Ag-Pd and Co-Cr alloys, and microscopical analyzis of specimens cuts did not reveal the existence of a marginal gap.
Ključne riječi
marginal gap; bond strength; bonding system
Hrčak ID:
97969
URI
Datum izdavanja:
15.9.1998.
Posjeta: 1.162 *