The effect of time lapse on the accuracy of two acrylic resins used to assemble an implant framework for soldering
Section snippets
Material and methods
Three stainless steel implant replicas (Nobel Biocare USA, Yorba Linda, Calif) were secured 20 mm apart in a flat, type IV stone (Suprastone; KerrLab, Orange, Calif) model with the use of a parallelometer. A type IV gold alloy cast framework (PBVI; Phoenix, Shannon, Ireland) was fabricated with the use of premachined gold cylinders (DCA073; Nobel Biocare, Gothenberg, Sweden). The framework was sectioned carefully with a 0.25-mm-blade saw (Antiope, Germany) at 2 points; each cylinder was thereby
Results
All specimens, regardless of resin type, exhibited passive fit at the 15-minute interval (Table I). At the 2-hour interval, none of the assemblies fabricated with Duralay but 2 of the 20 assemblies fabricated with GC Pattern resin were deemed adequate. None of the assemblies of either resin exhibited visual passive fit at the 24-hour time point.
Discussion
This study was designed to compare the relative visual accuracy of 2 materials commonly used to make soldering indexes for implants. No attempt was made to determine absolute accuracy. Visual accuracy of fit was obtained for both types of resin assemblies after a 15-minute time lapse, but after 24 hours, none of the indexed assemblies exhibited visual passive fit. The probable cause for this finding is continued polymerization and shrinkage of the materials.
Conclusions
The results of this investigation suggest that implant assemblies joined with acrylic resin materials should be invested as soon as possible after polymerization.
References (9)
A technique for accurate soldering
J Prosthet Dent
(1972)- et al.
Efficient soldering index materials for fixed partial dentures and implant substructures
J Prosthet Dent
(1995) - et al.
Polymerization shrinkage of index and pattern acrylic resins
J Prosthet Dent
(1990) - et al.
Comparison of accuracy of soldering indices for fixed prostheses
J Prosthet Dent
(1978)
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