Effect of disinfection of custom tray materials on adhesive properties of several impression material systems.
The effects of impression tray disinfection procedures on the bond strength of impression-material adhesives to two types of resin trays were evaluated with a tensile test. Autopolymerizing acrylic resin and a visible light-curing resin were formed into one-half inch cubes. A screw eye was attached to each cube before polymerization. Perforated trays were fabricated with stops to maintain an even one-eighth inch of impression material over the resin block. Hooks on the opposite side 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 1:213 iodophor solution; one third in a 10% sodium hypochlorite solution, and one third were kept in the "as fabricated" condition. Polysulfide, polyether, and polyvinyl siloxane impression material-adhesive systems 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 5 inches per minute. Mean values for adhesive strength ranged from 3.49 kg/cm2 for the autopolymerizing acrylic resin/iodophor/polyether combination to 10.55 kg/cm2 for the autopolymerizing acrylic resin/untreated/polyvinyl siloxane combination. Differences were detected among materials and disinfecting procedure. Clinically, disinfection of resin trays may adversely affect retention of the impression material to the tray.
Thompson
G A
GA
Advanced Education Program in Prosthodontics, Walter Reed Army Medical Center, Washington, D.C.
Vermilyea
S G
SG
Agar
J R
JR
D000180:Acrylic Resins / Q000737:chemistry; D000268:Adhesiveness; D000269:Adhesives / Q000737:chemistry*; D002858:Chromium Alloys / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique / Q000295:instrumentation*; D003764:Dental Materials / Q000737:chemistry*; D004202:Disinfectants / Q000737:chemistry*; D004203:Disinfection / Q000379:methods; D007466:Iodophors / Q000737:chemistry; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength
D000180:Acrylic Resins; D000269:Adhesives; D002858:Chromium Alloys; D003722:Dental Alloys; D003760:Dental Impression Materials; D003764:Dental Materials; D004202:Disinfectants; C022821:Impregum; D007466:Iodophors; D011108:Polymers; D011145:Polyvinyls; D012117:Resins, Synthetic; D012833:Siloxanes; D013440:Sulfides; C034183:vinyl polysiloxane; C060386:Triad resin; C039459:ticonium; C032915:polysulfide; D012973:Sodium Hypochlorite