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Biomedical subjects

A Simonis

Publications and source records attributed to A Simonis.

15 recordsLinked to original sources
PubMed1991

[Results of a conservative functional treatment concept for condylar fractures during childhood].

In 65 patients having sustained a condylar fracture of the mandible during the growth period between the ages of 2 and 12 years, the influence of age at trauma on later structural deformity and dysfunction was studied. A restitution undiscernible from normal was found in only 3 patients. In the other 62 patients varying degrees of subjective complaints, clinical dysfunction and radiographic irregularities of the ascending ramus or joint had to be noticed.

Age Factors↗
PubMed1990

[Ultimate tensile strength of plasma- and laser-welded cast titanium (Titaniumer, Ohara)].

The ultimate tensile strength (UTS) of titanium castings (Titaniumer, Ohara) as cast and after plasma-welding, laser-welding and soldering was investigated according to DIN 13912. The UTS of titanium as cast was 567 (+/- 36) MPa. After plasmawelding UTS decreased by 69% on the average, after laser-welding by 20%, after soldering with Ag65Cu20Pd15 (1060 degrees C) by 46% and after soldering with Ag72Cu20Ti8 (980 degrees C) by 63%. The highest tensile strength was observed in laser-welded titanium under the conditions described.

Dental Casting Technique↗
PubMed1990

[Functional status of patients prior to and after orthognathic surgery].

The functional status of 12 patients was evaluated before and after orthognathic surgery for a malocclusion. The results of surgical intervention showed distinctive differences in the status of the temporomandibular joint and masticatory musculature. The number of tender muscles on palpation and the occurrence of temporomandibular joint sounds was reduced to approximately one third. However, the number of joints showing pain on palpation increased. Axiographical recordings of movement paths shawed normal values in 2 patients postoperatively. Chewing patterns were generally more harmonious, but the size of the chewing field was smaller.

Adult↗
PubMed1990

[Plaque accumulation on various veneering resins--a clinical study].

Initial plaque accumulation on five veneering resins was investigated to determine differences in vitality and adhesion of microorganisms. After 24 hours of exposure of the specimens in the mouth, the vitality of the bacteria was reduced. The vitality and the adhesion increased only a little until the fourth day. The high plaque accumulation observed in vivo on resin veneers seems to depend primarily on the degeneration and mechanical lesions of the surface after a certain time in mouth.

Bacterial Adhesion↗
PubMed1990

[In-vivo corrosion tests of dental alloys in relationship to saliva pH].

The corrosion of four dental alloys and titanium was studied in relationship to saliva pH and plaque accumulation in vivo. Test specimens were scanned for porosities with an image analysis system before and after exposure to the oral milieu. The saliva pH was monitored during the study period. After four days of exposure in the mouth the plaque accumulation and the vitality of the plaque on the alloy surfaces was evaluated. Plaque accumulation and mean saliva-pH were not correlated with the observed surface corrosion. The least surface effects were observed on titanium, which showed the highest plaque accumulation. Different alloys showed different bacteriostatic effects. The least amount of living bacteria was found on titanium. Plaque accumulation and bacteria vitality depended on material and test person.

Corrosion↗
PubMed1989

[Plaque-accumulation on galvano-ceramic crowns].

48 patients treated with galvano-ceramic crowns and bridges were evaluated as to their plaque indices according to Silness and Löe (PI) and their papillary bleeding indices (PBI) according to Mühlemann. The mean values of PI and PBI were determined for all teeth as well as for defined groups of teeth: sound teeth, teeth with galvano-ceramic crowns and other restorative materials. Galvano-ceramic crowns showed the least plaque accumulation. Their PI was lower than the PI of sound teeth. Resin-veneered crowns and full cast crowns exhibited significantly higher PI-values in the posterior area. Crowned teeth had a higher PBI than sound teeth, but galvano-ceramic crowns showed lower PBI-values than crowns of other restorative materials.

Crowns↗