PURPOSE: To study the viscosities of eight interocclusal registration materials at 30 seconds after the start of mixing and to compare the time (Tcv) required for various interocclusal registration materials to reach a proposed critical viscosity of 5,000 poise. MATERIALS AND METHODS. One zinc-oxide eugenol, one polyether, and six vinyl-polysiloxane interocclusal registration materials were studied. The viscosities of the polymerizing materials were monitored with a cone and plate viscometer. RESULTS: One-way analysis of variance showed significant difference in the viscosity at 30 seconds and in the Tcv among the materials. A zinc oxide eugenol interocclusal registration material was found to possess the lowest viscosity at 30 seconds and the longest Tcv. CONCLUSIONS: The criteria for the selection of an interocclusal registration material should include its viscous properties because all materials behaved differently.
PURPOSE: To study the viscosities of eight interocclusal registration materials at 30 seconds after the start of mixing and to compare the time (Tcv) required for various interocclusal registration materials to reach a proposed critical viscosity of 5,000 poise. MATERIALS AND METHODS. One zinc-oxide eugenol, one polyether, and six vinyl-polysiloxane interocclusal registration materials were studied. The viscosities of the polymerizing materials were monitored with a cone and plate viscometer. RESULTS: One-way analysis of variance showed significant difference in the viscosity at 30 seconds and in the Tcv among the materials. A zinc oxide eugenol interocclusal registration material was found to possess the lowest viscosity at 30 seconds and the longest Tcv. CONCLUSIONS: The criteria for the selection of an interocclusal registration material should include its viscous properties because all materials behaved differently.