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Biomedical subjects

Hans Zesewitz

Publications and source records attributed to Hans Zesewitz.

2 recordsLinked to original sources
PubMed2005

[Heat propagation in dentin during cavity preparation in vitro with oscillating instruments].

The purpose of this work was to study the temperature rise caused by preparation of human dentin using two different types of oscillating instruments. A newly designed tungsten carbide tip (Cariex TC, KaVo) and a diamond-coated tip (Cariex D, KaVo) in combination with an airscaler (Sonicflex 2003L, KaVo) and two different flow rates of two coolants were investigated. For both tips significant differences in temperature rise were found between cooling with waterspray or with Plakout Gel (Kerr, HaWe) and using no coolant. A flow of 7.3 ml water/min was found to be sufficient to avoid any critical temperature rise, an excavation of longer duration without coolant cannot be recommended. The use of water-based highly viscous substances over a defined period during the caries excavation process seems to be a viable alternative.

Dental Caries↗
PubMed2005

[Cavity micro-morphology following caries removal].

The objective of this research was to observe the effect of different caries removal techniques on human dentin topography. Thirty-six dentin samples of bisected carious human molars were treated with six different caries removal techniques, replicated and then examined by using a scanning electron microscope. The surfaces were observed before and after the smear layer removal at a magnification of 200- and 1000-fold. At a magnification of 200 the sono-abraded samples showed a significantly more undulated dentin topography than samples treated with other techniques. Using Carisolv hand instruments for caries removal resulted both at a magnification of 200 and 1000 in a significantly rougher, flakier and more fissured dentin surface texture compared to other techniques. Microcracks were observed in samples from all excavation methods but most frequently when treated with Carisolv hand instruments. The excavation process results in a dentin topography marked by smooth, flaky and fissured surface textures as well as by microcracks. The relative incidence in which these textures occur may indicate whether the removed dentin was rather cut or fractured.

Dental Caries↗