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KMID : 0362419960340020290
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Journal of Korean Academy of Prosthodontics
1996 Volume.34 No. 2 p.290 ~ p.298
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Effect of disinfection of custom tray materials on adhesive properties of several impression material systems
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Kim Jung-Han
Jeong Chang-Mo
Jeon Young-Chan
Hwang Hic-Seong
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Abstract
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The effects of impression tray disinfection procedures on the bond strength of impression-material adhesive to two of types resin trays were evaluated with a tensile test. Autopolymerizing acrylic resin was formed into 1xlxl cm cubes, A hook was attached to each cube with autopolymerizing acrylic resin. Perforated trays were fabricated with stops to maintain an even 3 cm of impression material over the resin block. Hook on the opposite side of the perforated tray permitted attachment of the metal plate to a mechanical testing machine. Before adhesive was applied, one third of the resin specimens were immersed in a 5% sodium hypochlorite solution : one third in a 2% glutaradehyde solution, and one third were kept in the "as fabricated" condition. Three products(Perfect vps, Exafine, and Express) of polyvynil siloxane impression material-adhesive system were evaluated. The resin-impression material-metal plate couples were attached to a mechanical testing machine and tensile forces were applied at a separation rate of 10 centimeters per second. @ES The results were as follows ; @EN 1. Both disinfectant and adhesive had effects on bond strength values, but adhesive had more effect than disinfectant(p<0.01). However, there was no interaction between dininfectant and adhesive(p>0.01). 2. Mean bond strength values for the Perfect materials were about 85% less than that of the Exafine or the Express materials. However, there was no stastically significant difference between the mean bond strength values of the Exafine materials and the Express materials(p>0.05). 3. The use of disinfectants produced significant reduction in bond strength values p<0.05). But, there was no stastically significant difference between the mean bond strength values of the groups treated with disinfectants(p<0.05)>
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