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Biomedical subjects

G Ahrens

Publications and source records attributed to G Ahrens.

At least 19 recordsLinked to original sources
PubMed1990

[Histologic verification of the reliability of clinical caries diagnoses].

The reliability of different investigators' assessment distinguishing carious cavities from caries-free ones was examined in an in vitro study. In 23 recently extracted human teeth caries was completely removed by the principal investigator, while in 17 teeth caries was only incompletely removed. On two occasions at an interval of 2 weeks, 5 investigators established the diagnosis "carious" or "caries-free" after clinical inspection using probe and mirror. Decalcified thin sections were examined in order to determine objectively if a tooth was caries-free or not. On an average, 8 out of 10 carious and 6 out of 10 caries-free cavities were correctly diagnosed. An analysis of the erroneous diagnoses showed that it was deep interproximal lesions that went unnoticed most frequently. Lesions at the enamel-dentin junction were also overlooked. False positive diagnoses were three times more frequent than false negative results. The reliability of caries detection (sensitivity 83.5%) was far higher than reported in the literature.

Dental Caries Activity Tests↗
PubMed1989

[Staining of carious dentin with Kariesdetektor].

In a histological study of the staining effect of the staining solution Kariesdetektor 60 human teeth with carious lesions of varying sizes were separated into one control half and one test half each immediately following their extraction. Non-decalcified thin ground sections were prepared with the aid of the saw-cut-and-grind technique. The test halves were stained with Kariesdetektor, the control preparations with toluidine blue. The staining effect of the disclosing dye was evaluated under the light microscope and compared with the control preparations. In enamel the disclosing dye stained all carious areas except the dark and the more peripheral transparent zones. In dentinal caries the zones of necrosis and penetration were safely stained. Zones of demineralization, dead tracts, and transparency zones were not stained. Kariesdetektor is a reliable optical aid in removing infected carious hard tooth structures.

Dental Caries↗
PubMed1989

[Studies into the effectivity of Caridex in caries removal].

It was the goal of this study to find out if Caridex is a reliable method for removing dentine caries. Different lesions on 37 teeth were treated with the system and subsequently examined for caries. The macroscopic results were verified using undecalcified thin sections stained with toluidine blue and examined for residual caries under the light microscope. Even after applying the system for as long as 30 minutes there were only two cases where the floor of the cavity could be referred to as caries-free, while none of the enamel/dentin interfaces was caries-free in the cases treated. Histologically four preparations could be considered caries-free. The use of the Caridex system alone produced no satisfactory results.

Aminobutyrates↗
PubMed1985

Effect of a preventive program based on professional toothcleaning and fluoride application on caries and gingivitis.

The effect of a preventive program was studied in 12-14-yr-old children. 104 children (test group) participated in this program. After four visits in the first 6 wk, the children visited the oral hygienist five times a year to receive professional oral prophylactic treatment and instructions. Additionally a fluoride application (Duraphat) was given two times a year. Children of a control group (n = 117) received no prophylactic treatment. Diet was not controlled in either test or control group. After 2 yr mean caries increment amounted to 2.7 +/- 2.8 new DFS in the test group and 5.0 +/- 4.2 new DFS in the control group, respectively. The most pronounced differences between the two groups could be found on the proximal surfaces. In all, caries was reduced by 46% during the 2-yr period. Plaque accumulation and frequency of gingivitis were significantly reduced only in the test group (67% and 55%, resp.). The data revealed that the program reduced both caries and gingivitis to a remarkable extent.

Adolescent↗