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Biomedical subjects

D E Gerhardt

Publications and source records attributed to D E Gerhardt.

8 recordsLinked to original sources
PubMed1993

Cytotoxicity of impression materials.

The purpose of this study was to assess the potential cytotoxicity of impression materials. The impression material brands tested included Impregum, Reprosil, Surgident, Permlastic, Jeltrate Regular and Jeltrate Fast Set. These impression materials and their components were tested for their possible cytotoxic effects by three different methods. The results showed that all impression materials were cytotoxic to some degree by all three assay methods and some of the components were also cytotoxic. These results support the literature showing in vivo adverse effects of certain impression materials and/or their components in patients and practitioners.

Alginates↗
PubMed1993

Accuracy of irreversible hydrocolloid impression material mixed with disinfectant solutions.

PURPOSE: Irreversible hydrocolloid is capable of resisting contamination by viruses and saliva when the disinfectant iodine or the disinfectant chlorhexidine is added to the water being used to mix the material. This study investigates the accuracy of alginate impressions made with water to which either of the two disinfectants has been added. MATERIALS AND METHODS: A total of 30 casts were made from an impression of a master cast. Ten impressions were made using water according to the manufacturer's instructions, ten were made using water to which iodine had been added, and ten were made using water to which chlorhexidine had been added. A measuring microscope was used to measure three different dimensions on each cast. Each measurement was repeated three times, and the average was used to compute the mean and standard deviation for each measured dimension. The data were statistically evaluated using a one-way analysis of variance. RESULTS: There was no statistical difference in the accuracy of irreversible hydrocolloid impressions mixed with water or with either of two disinfectant solutions. CONCLUSION: Accurate casts can be obtained when either of the two disinfectants are incorporated into the alginate impression material.

Alginates↗
PubMed1993

Trouble shooting everyday restorative emergencies.

Restorative emergencies present themselves nearly every day in a general practice. Both patients and staff appreciate a designed triage protocol that is followed to route patients for treatment. Although most restorative emergencies do not require immediate attention, to patients, the problem is unsettling and they would want it evaluated as soon as possible. When the necessity for the immediate treatment of an emergency is confirmed, the office schedule is least disrupted when the practitioner and staff follow restorative treatment techniques that manage the dilemma. This article has attempted to provide the dentist with some methods of triage and treatment of restorative emergencies. There are other methods for treating patients with similar emergency needs. The manner that is chosen has to be the one that works at a clinically predictable level.

Crowns↗
PubMed1991

Impression materials and virus.

Results of this study indicate that impression materials vary in their ability to absorb and retain virus. Disinfection procedures specific for each material or groups of materials should be developed.

Colloids↗
PubMed1991

Factors affecting the stability of sodium hypochlorite solutions used to disinfect dental impressions.

Increased concern over the transmission of acquired immunodeficiency syndrome, hepatitis B, herpes, and other diseases has prompted research into the disinfection of dental impressions. Among the factors to be considered when dental impressions are disinfected is the stability of the disinfectant solutions during storage and use. This study is concerned with the effect on disinfectant solutions of repeated immersion of alginate dental impressions taken in metal trays. The effects of the impression materials, metal trays, and dilution were evaluated, and the impact of light, heat, and storage were also addressed. The findings indicated that in the test solutions, although considerable chlorine was consumed during the disinfection procedures, bactericidal activity was maintained, while in the control solution both chlorine content and bactericidal activity were remarkably stable.

Dental Impression Materials↗
PubMed1988

Traditional "one size fits all" dental education: no longer adequate.

Fundamental changes are needed in dental education that recognize the differing career paths of dental scientists and dental clinicians, and the fact that the functionally different careers of both groups are no longer adequately served by the traditional dental school curriculum.

Career Choice↗