Biomedical subjects

W W Chee

Publications and source records attributed to W W Chee.

39 records · Page 3Linked to original sources

PubMedDate not supplied

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↗

PubMedDate not supplied

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↗

PubMedDate not supplied

Phenytoin hyperplasia occurring in relation to titanium implants: a clinical report.

Dilantin sodium is a commonly used anticonvulsive agent. A well-known side effect of this medication is hyperplasia of gingival tissues. This hyperplasia has also been reported in mucosa beneath complete dentures and has been related to poor oral hygiene. This case report describes hyperplasia of tissues around titanium implants in a patient taking Dilantin sodium to prevent epileptic seizures. The excess tissue was removed and hygiene reinforced. No recurrence of the tissue enlargement is evident after 1 year.

Dental Implants↗