δείτε την πρωτότυπη σελίδα τεκμηρίου στον ιστότοπο του αποθετηρίου του φορέα για περισσότερες πληροφορίες και για να δείτε όλα τα ψηφιακά αρχεία του τεκμηρίου*
A comparison of the adhesive strengths of two resin to metal bonding systems
(EN)
Polymer materials for the veneers o f fixed prostheses commonly require retention elements on metal framework, because there is no chemical adhesion. The use o f retention elements, however, is related to certain problems and the lack o f chemical bond allows the creation o f marginal gaps at the resin - metal interface, due to the different thermal expansion coefficients of the two materials.
The development o f the chemical resin - to metal bonding could resolve this problem and also reduce the need for mechanical retention on metal frameworks.
The aim o f this study was to evaluate the bond strength o f two current systems after wet storage and intesive thermocycling program.
Two resin to metal bonding systems were tested: Silicoater MD - Dentacolor and rtglass - Kevloc. Three dental alloys were used: Wiron 99 (Ni - Cr, Bego Co.), Wirolloy (Ni - Cr, Bego Co.) and Wirobond C (Co - Cr, Bego Co.). The bond strengths between resin and metal were determined by the use of the four - point flexure test (4 FPBT). Before this, all the samples were subjected to a thermocycling program that included 1500 thermal cycles between 5°C - 55°C.
This study indicated that the Silicoater MD - Dentacolor system can provide stable bonding o f resin to metal substructures. On the other hand,
the Artglass - Kevloc system demostrated bond failures after thermocycling and indicated unstable bonding or weak bond strengths. For this
system, additional in vitro research is required to investigate the mechanism o f bond weakening after thermocycling.
(EN)
*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.
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