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Biomedical subjects

K R Jahn

Publications and source records attributed to K R Jahn.

At least 19 recordsLinked to original sources
PubMed2002

Kinetic cavity preparation--hit or flop?

The preparation of dental hard tissues is carried out primarily with rotating instruments and is known to have some shortcomings. Kinetic cavity preparation (KCP) seems to be a desirable alternative. Nevertheless, scientific investigations and clinical experiences revealed numerous disadvantages which have led to a clear limitation of its use. For example, KCP can not replace the normal conditioning of enamel by acid etching. The hopes connected with the re-introduction of this technology for conservative dentistry have not been fulfilled.

Acid Etching, Dental↗
PubMed1999

Tensile bond strength of composite to air-abraded enamel.

PURPOSE: The purpose of this study was to test the tensile bond strength of composite resin to enamel surfaces treated with kinetic cavity preparation (KCP) and acid etching, respectively. MATERIALS AND METHODS: Plane labial surfaces of 280 human maxillary central incisors were treated with either KCP by varying treatment conditions or phosphoric acid gel. Composite samples were bonded to the pretreated surfaces with a bonding resin. After 24 hours specimens were loaded in tension in an Instron testing machine until bond failure. A two-way analysis of variance was used to determine significant differences. The failure sites were qualitatively evaluated by SEM. RESULTS: The determined tensile bond strengths and observed failure modes demonstrated that acid-etched enamel has a significantly higher bond strength to composite resin than KCP-treated enamel surfaces. CONCLUSION: KCP-prepared enamel has to be acid etched before bonding to composite resin.

Acid Etching, Dental↗
PubMed1990

[Dental amalgam--filling material with future?].

On the basis of a literature survey there is a discussion about advantage and disadvantage of dental amalgam, possible alternatives and at least eventual dangers by intoxication of mercury. As result the amalgam were found without hesitation and classified as clinical suitable.

Dental Amalgam↗
PubMed1990

[Clinical controlled trial for secondary caries preventive effect of Duraphat on cavity walls].

On a base of a clinical controlled trial the secondary caries preventive effect of a topical application of fluoride varnish (Duraphat) was verified. 255 pairs of amalgam restorations were placed in 191 patients, 152 (79.6%) of whom returned for assessment after a 24 month follow-up period. This group of 152 patients received 188 (73.7%) pairs of restorations. The cavity walls of one restoration of each pair were covered with an thin layer of a fluoride containing varnish. The secondary caries rate of the untreated restorations in such manner was four time greater than the treated ones. The results suggest that the topical application of a fluoride varnish on the cavity walls can be an effective measure for secondary caries prevention.

Adolescent↗
PubMed1990

[Black's rules for cavity preparations--anachronism or adequate plumb line?].

On the basic of a literature review Black's rules of cavity preparations are discussed. In the summary it suggested that the rules are valuable to discuss, but new perceptions had modified them. The contemporary cavity preparations saved the teeth structures and payed regard to the properties of filling materials.

Dental Cavity Preparation↗
PubMed1989

[Clinically controlled experiment on frequency of secondary caries in amalgam and mold fillings].

The purpose of the present controlled clinical study was to assess and compare the secondary caries rate of amalgam fillings and castings, respectively. 154 pairs of fillings (class I and II) were included in the trial and the time of observation was two years. The fillings were made under equal clinical conditions particularly with regard of dentist's care. The secondary caries rate of the amalgam fillings was 20.1% and of the castings 18.2%, respectively. The difference was not significant (chi-square-test). The reason of that is probably the similar care of the manufacturing of fillings. Therefore the authors recommend amalgam fillings for the restoration of class I and II cavities.

Clinical Trials as Topic↗