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Biomedical subjects

M Wichmann

Publications and source records attributed to M Wichmann.

9 recordsLinked to original sources
PubMed1991

[Temperature profile in the enamel during cold tests].

The temperatures on the surface of human teeth during pulp vitality tests with frigen and carbon dioxide snow were recorded in an in vitro study. Frigen spray caused particularly rapid changes in temperature. The lowest temperature (-52 degrees C) was measured with CO2-snow (with a pressure of 9.81 N against the tooth surface). To obtain higher temperatures at lower rates of change, the use of a thin latex fingerstall proved to be effective.

Body Temperature↗
PubMed1991

[Studies on the effects of abutment position on the prognosis of endosseous implants].

Although the use of osseointegrated Brånemark implants is associated with a high success rate, late losses of primarily osseointegrated implants have been observed again and again. In this study 50 patients were evaluated to clarify the effects of abutment position on late losses. The results have shown that implant position is less important for the loss of implants than other parameters such as healing disorders or poor oral hygiene.

Dental Abutments↗
PubMed1990

[Visibility of front and side teeth].

Anterior and posterior tooth visibility was analysed in a population of 220 subjects. Scoring photographic data gave the percentages of anterior and posterior teeth shown in different situations: speaking, laughing, exaggerated smiling. The consequences for planning and manufacturing dentures are shown by examples.

Esthetics, Dental↗
PubMed1990

[Veneered cast clasps. A comparative study].

To improve their esthetic appearance, clasps can be covered with veneer materials. The bonding strengths of the Silicoater/Dentacolor-, the 4-Meta-Meta-Color- and the Rocatec/Visio-Gem-Systems were sufficient for coating metal clasps with a thin layer of toothcoloured resin. Different aspects in processing make the Rocatec/Visio-Gem-System most qualified for covering metal clasps.

Acrylic Resins↗
PubMed1990

[Measuring the accuracy of various elastomeric impression materials using a CNC coordinate measuring device (Part 1)].

This study compares the accuracy of 23 impression materials. With each material seven impressions of a stainless steel master die were taken under standardized conditions. Characteristical dimensions of the master die and of the stone dies as well were determined by means of a CNC coordinate measuring device. Differences in prepared tooth heights ranged between -36 and +19 microns. The occlusal distances between prepared teeth were 2 to 54 microns greater on the stone dies than on the master die. Diameters differed by -89 to +52 microns. The two phase impressions tended to result in stone dies of reduced size, whereas single phase and double mix impression techniques produced larger stone dies than the master die.

Dental Impression Materials↗