Biomedical subjects
Publications and source records attributed to B Klaiber.
The plaque index, sulcus-hemorrhage index, and osteoclasis were measured in a clinical study of 60 patients. The presence of premature contacts was determined via instrumental functional analysis. The statistically evaluated findings establish that occlusal interference has a damaging influence on osteoclasis in the presence of inflammation.
A clinical study employing instrumental functional analysis showed that no conclusive relationship exists between traumatizing occlusion and the appearance of Stillman clefts. Thirty-seven patients with a total of 142 clefts were studied.
Twenty-seven commercially available composites and three amalgams were examined under practical test conditions in terms of their abrasion behavior during brushing. Differences in wear of more than the factor 10 were established. In addition, quite different surface alterations are produced which can be explained by the special abrasion mechanism.
The course of healing following direct capping of the pulp with collagen fleece differed from that after capping with Calxyl. The collagen fleece covering the pulp and filling part of the dentinal defect was replaced by newly formed pulp tissue with a new growth of dentine from the margins. Calxyl however initially produced localized necrosis. Hard substance was deposited in this circumscribed necrotic area.
Quantitative microbiologic examinations of fluid taken from gingival sulci were carried out with patients suffering from chronic lymphatic leukemia (CLL), i.e. with disturbed immune response, and with healthy subjects. The pathogen count in each case was correlated with the gingival index, the plaque index, the amount of fluid in the gingival sulcus, and the pocket depth. Patients with chronic lymphatic leukemia with gingiva clinically free of inflammation showed one to 20 times more bacterial flora in fluid from the gingival sulcus than fluid from healthy control subjects. The quantitative values tend to equalize only if imflammation is severe. If the pathogen count is considered a function of the amount of plaque or pocket depth, markedly more microorganisms/mm3 of sulcus fluid were found with CLL patients than in the control group. It therefore may be concluded that immunologic reactions contribute decisively to the causation and maintenance of gingivitis with all of its consequences and that these reactions play an important role in the destruction of pathogens found in the region of the gingival pocket.
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Twenty-two commercially available composites, a new resin without inorganic filler and two amalgams have been investigated to compare their abrasive behaviour. In laboratory tests, an abrasion model of tooth against filling has been simulated. The results indicate a dependence of the abrasive behaviour on the type of filler in the different composites. Composites with quartz as filler have the greatest resistance to abrasion, whereas those with lithium-aluminium-silicate show the strongest abrasion. Mean abrasion values are obtained for the composites with barium-glass or a mixture of barium-glass and quartz as filler. The resin and the two amalgams have abrasion values comparable to the abrasive resistant composites.
Operative planning for progenia is carried out using prosthetic principles. Correction of a malpositioned mandible, modelling of incongruent dental arches, functional distribution of piers, and a favorable interalveolar connecting line form the basis for stable occlusion and articulation. The fitting of a prosthesis later is simplified by such intensive interdisciplinary cooperation.
The generation time and the division rate were measured with routine methods of cell culturing. The conditions contributing to the stagnation of growth were examined; the synchrony of the growth process was investigated. The biochemical composition of the cells was assessed via colorimetry and then compared with other cell systems. The cell culture examined may be used to test capping materials; only cells up through the eighth generation however should be utilized.
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This study evaluated the influence of radiation intensity on polymerization of a resin-based composite (RBC) and compared the influence of guidance of shrinkage vectors vs irradiation at reduced light intensity on the marginal seal of Class V RBC restorations in vitro. The degree of cure was studied indirectly by measuring the Vickers hardness (1.96 N, 30 seconds) at the bottom of disc-shaped specimens 2 mm in height at different periods of time after light irradiation. After one hour, irradiation using a high-intensity curing light (Heliolux GTE, Vivadent, 600 mW/cm2) [HICL] from close distance for 20 seconds, 40 seconds or 60 seconds or a low-intensity curing light (Vivalux, 250 mW/cm2) [LICL] from close distance for 60 seconds produced higher hardness values compared to 20 seconds or 40 seconds using the LICL or using the HICL from a distance of 10 mm. After three and 24 hours, higher hardness was observed for all irradiation protocols. After 24 hours, only specimens irradiated by the HICL for 20 seconds or 40 seconds from 10 mm distance featured significantly lower hardness compared to the remaining curing modes. The influence of different irradiation strategies on marginal seal of Class V RBC restorations was evaluated in vitro using dye penetration after water storage (60 days, 37 degrees C) and thermocycling (2500 cycles 5 degrees-55 degrees C). The HICL produced more dye penetration than the LICL. Placing the light tip directly over or 10 mm above the center of the cavity ("standard irradiation, ["distance irradiation"]") resulted in similar penetration values. In contrast, positioning the light tip apical to the cervical margin and moving it slowly to the center of the cavity ("cervical start irradiation") compromised the marginal seal.
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