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Biomedical subjects

R Mayer

Publications and source records attributed to R Mayer.

At least 37 records · Page 2Linked to original sources
PubMed1978

[Scanning electromicroscopic studies of the surface of teeth. I. After manual treatment with tooth cleansers. II. Tooth cleaning with power-driven instruments].

Scanning electron microscopic examination of tooth surfaces after using manually operated instruments to remove calculus showed distinct lesions on the hard substances of the tooth. The extent of damage depends considerably on the area of the tooth treated (the border between the enamel and the cementum is particularly endangered), the amount of force used, and the length of time required for treatment. Examination of tooth surfaces following application of various types of power-driven scaling instruments revealed that lesions of the hard substances on the tooth are possible. The extent of the damage depends on several different factors, particularly the pressure applied and the area of the tooth treated. The border between the enamel and the cementum is particulary endangered.

Dental Cementum↗
PubMed1977

[Dislocations of the face and skull. Report of 20 cases].

The authors present a serie of 20 cases of craniofacial injuries with or without CSF leakage. They propose a simple classification in 2 groups following the impact: braniofacial injury or orbitofacial injury. For their, craniofacial or orbitofacial injuries are to be operated in one stage by an neurosurgical and maxillofacial team. The best time for operation is approximately around the 10th day following trauma.

Facial Bones↗
PubMed1977

[The shaping of the margin in cast objects in oral rehabilitation].

Various preparations of margins in cast replacements as well as their insertion and finishing are studied and measured by means of radioactive isotopes. It was found, in particular, that the conventional preparation of cavity margins and the finishing of cast margins of tightly cemented cast replacements should be discontinued.

Cementation↗
PubMed1976

Dense autotrophic cultures of Alcaligenes eutrophus.

Alcaligenes eutrophus was grown autotrophically in 23-liter batch cultures in a controlled H2-O2-CO2 atmosphere. It was demonstrated that the need for periodic supplements of individual nutrients could be anticipated before cell growth depleted these nutrients to the point of becoming growth rate limiting. As a result, exponential growth was extended to optical densities of 44, with doubling times maintained at 2 h. Cultures having an initial optical density of 0.040 to 0.70 reached the final optical density of 60 in about 25 h. The final viable count was 1.2 X 10(11) cells per ml, and the dry weight was 25 g/liter.

Alcaligenes↗
PubMed1976

[Is hygiene endangered in the modern dental office?].

Hygienic studies of the manual buttons of a modern dental unit show that these buttons are being contaminated during treatment. The number of germs depends on the duration of treatment and on the number of patients treated. As these buttons were pushed with the foot in dental chairs of older design, the ergonomic advantages of modern dental units do not mean hygienic advantages to the same extent.

Dental Offices↗
PubMed1976

[The retention of plastic filling materials with various lining materials and technics].

In "tensile strength" tests an attempt was made to find out whether a material and/or the type of preparation of the cement base and/or a specific filling technique have any influence on the retention of a permanent filling in a cavity prepared according to Black's principles of preparation. The following was found: 1. Amalgam fillings placed on hardened cement bases did not show any differences in their retention behavior. The type of the protective base material was of no importance. 2. Fillings rapidly inserted according to Robiczek's method showed considerably higher retention values. 3. The filling material combines with the cement base only in rapidly inserted fillings which considerably contributes to increased retention.

Dental Cavity Lining↗