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Biomedical subjects
T E Donovan
Publications and source records attributed to T E Donovan.
A pilot study of polymerization inhibition of poly (vinyl siloxane) materials by latex gloves.
Intraoral inhibition of two poly (vinyl siloxane) low-viscosity impression materials was experienced when making an impression of prepared anterior teeth. It was hypothesized that the noted inhibition was a result of contamination with latex gloves. A screening test demonstrated inhibition of polymerization of three different materials when placed in contact with a surface that had been touched with one brand of latex gloves. This inhibition also occurred even if the gloves were washed prior to contact or if the surface was washed after contact with the gloves. Further studies are underway to determine which brands of gloves are safe to use.
Chemical Phenomena↗
Interaction of gloves and rubber dam with a poly(vinyl siloxane) impression material: a screening test.
Polymerization inhibition of poly(vinyl siloxane) impression materials has been reported with the use of latex gloves. This study evaluated the effect on polymerization of a poly(vinyl siloxane) impression material in both direct and indirect contact with 25 brands of latex gloves, two brands of vinyl gloves, and two weights of rubber dam. Use of all but one of the latex products (96%) resulted in inhibition of polymerization with direct contact. Forty percent of the latex gloves tested inhibited polymerization with indirect contact. The vinyl gloves tested had no effect on polymerization. The implications of inhibited polymerization were discussed.
Dental Impression Materials↗
Fine detail reproduction of very high viscosity poly(vinyl siloxane) impression materials.
Very high viscosity (putty) poly(vinyl siloxane) impression materials are used with both the conventional double-mix and single-mix putty/wash techniques. When the latter technique is used, portions of the impression of the prepared teeth may be made in the putty rather than the wash material. This study investigated the ability of ten different putty materials to reproduce fine detail. The American Dental Association stainless steel test die for Specification No. 19 was used. Two of the materials consistently reproduced the 20-microns groove. Three of the materials reproduced the 20-microns groove in one-half of the samples tested, while the remainder failed to do so.
Dental Impression Materials↗
The influence of temperature on the dimensional stability of poly (vinyl siloxane) impression materials.
It may be desirable to extend the working time of poly(vinyl siloxane) impression materials when making a multiple-unit impression. Alteration of the base-catalyst ratio is not possible with automix systems, but chilling the impression material provides an alternative. This study evaluated the dimensional accuracy of chilled impression material and the effect on accuracy of reheating the impression to mouth temperature prior to pouring. Two brands of poly(vinyl siloxane) impression material were evaluated both after refrigeration and at room temperature. Impressions were poured at room temperature and reheated to mouth temperature prior to pouring. Gypsum dies were recovered and measured. Refrigeration had no statistically significant effect on dimensional accuracy. Reheating the impression had no clinically significant effect on accuracy.
Dental Impression Materials↗