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Biomedical subjects

M Hannig

Publications and source records attributed to M Hannig.

At least 55 records · Page 3Linked to original sources
PubMed1990

[SR Isosit composite inlays in a short term clinical test].

This in vivo study assessed the clinical behaviour and early cavomarginal breakdown of a total of 42 "SR-Isosit" composite inlay restorations. Indirect examination of replica models by means of stereomicroscope and SEM-analysis indicated a stepwise loss of marginal adaptation within the six month period of clinical use. Microfractures were most frequently found in inlay margins located on functional cusp sites, while the resin luting agent still remained in place on etched enamel.

Acrylic Resins↗
PubMed1990

[SEM study on finishing the joint between inlay and luting composite resin].

This in vitro study compared different methods of finishing luting composite resin spaces after insertion of composite resin inlays. SEM-evaluation revealed significant differences between the various finishing methods. Best results with high rates of perfect margins were obtained by use of twelve-fluted carbide burrs followed by surface polishing with silicone points.

Composite Resins↗
PubMed1989

[Surveillance and assessment of undesirable effects in drug treatment: pilot project].

Since 1986 the Institute for Health Systems Research Kiel has been constructing a system of intensive post marketing surveillance of new drugs by general practitioners. The purpose of the project is to develop a methodology for documenting the applications of new drugs and recording adverse drug reactions (ADR). The primary goal is to quantify adverse drug reactions and to discover previously unknown ADR. Participating physicians record their treatment of the patient and atypical events, which are then analysed for suspected ADR. This paper describes the documentation and evaluation methods and the current stage of research. The validity of the data collected on suspected ADR is evaluated by comparing the results obtained to those of other post marketing studies.

Angiotensin-Converting Enzyme Inhibitors↗
PubMed1989

[Optimizing marginal fit of amalgam restorations on the cervico-interproximal aspect].

SEM studies were conducted to demonstrate that marginal fit and surface quality of cervico-interproximal amalgam fillings may be improved considerably by polishing the fresh filling with fine grain finishing paper. The time of finishing as a function of the amalgam used was crucial, while the method of plugging (manual or automatic) had very little influence on later finishing of the filling surface.

Dental Amalgam↗
PubMed1989

[Cervico-approximal "Sofort" polishing of amalgam fillings. Optimizing filling quality].

Results from SEM-evaluation indicates that finishing the gingivoproximal part of freshly restored amalgam restorations with interproximal finishing strips (fine and x-fine grits) produces an improvement in marginal integrity and surface smoothness. For clinical success the procedure requires both only moderate trimming of the proximal cavity margin and using a fast setting spherical alloy. In case of admixture or lathecut alloys the interproximal finishing within the first 25 minutes after trituration causes an unwelcome roughness of the restorations surface texture and is therefore contraindicated.

Dental Amalgam↗
PubMed1989

[Comparative clinical study of efficacy of three multi-tufted short top toothbrushes with different bristle bed designs].

Three multi-tufted short-head toothbrushes were compared on 15 test persons, with respect to their efficiency in removing the plaque from margo gingivae and from the interdentium. With a different design of the bristle bed, all three brushes evidenced very little difference in the cleaning effect which, on the basis of the deliberately prescribed short cleaning time at the gingival margin, can be considered as good in respect of all teeth sections and as satisfactory in the approximal area. In individual cases, a slanted bristle bed can lead to better cleaning of the side teeth area.

Clinical Trials as Topic↗
PubMed1988

[Removability of tooth deposits by cleaning with toothbrushes and toothpaste].

The abrasion strength of the exogenous pellicle (EP) was investigated in in vitro experiments on extracted human teeth. The aim of the study was to elucidate the effect of daily brushing on the EP. EP-coated tooth specimens were cleansed under in vivo-like conditions. Five toothpastes with different degrees of abrasiveness were variously diluted with artificial saliva. The evaluation was done on the transmission electron microscope. The individual toothpastes differed significantly with respect to their abrasive effect on EP, which extended from only a slight effect on EP, which extended from only a slight effect to extensive removal of the pellicle. EP abrasion was considerably reduced by increasing dilution of the pastes with artificial saliva. No changes of the EP could be observed after brushing with only the toothbrush and saliva.

Dental Pellicle↗
PubMedDate not supplied

Influence of in vivo formed salivary pellicle on enamel erosion.

This study assessed the protective effect of the salivary pellicle formed in vivo during 24 h or 7 days against demineralization of bovine enamel caused by citric acid. In addition, the influence of acid treatment on the behavior of the pellicle was investigated. Enamel specimens with and without in vivo pellicles were immersed in citric acid (0.1, 1.0%) over 30, 60, and 300 s, and processed for scanning (SEM) and transmission electron microscopy (TEM), as well as for measurement of surface microhardness (SMH). Specimens coated with the in vivo formed pellicles revealed less extensive erosive demineralization of the enamel surface compared to uncovered enamel specimens. SEM analysis and SMH results did not indicate distinct differences between erosive surface alterations on enamel slabs covered with 24-hour pellicles and on those covered with 7-day pellicles. TEM analysis showed that the pellicle layer was dissolved in part from the enamel surface due to acid exposure. However, pellicle residues could be detected by TEM in all specimens, even after 5-min exposure to 1.0% citric acid. It is concluded that the in vivo salivary pellicle can resist the acidic action to some extent and provides protection to the underlying enamel surface against erosive destruction caused by short-term action of citric acid.

Animals↗
PubMedDate not supplied

Protective properties of salivary pellicles from two different intraoral sites on enamel erosion.

The purpose of this study was to investigate the protective effect and ultrastructure of salivary pellicles formed in vivo near the orifices of the ducts of parotid and submandibular/sublingual salivary glands. Pellicles were formed by exposing bovine enamel slabs to the oral environment at the buccal aspect of the upper first molars and at the lingual aspect of the lower incisors in 3 subjects over periods of 24 h. Enamel specimens with and without 24-hour pellicles were immersed in citric acid (0.1 and 1%) for periods ranging from 30 s to 5 min, and processed for measurement of surface microhardness (SMH) and transmission electron microscopy (TEM). In comparison to uncovered enamel specimen significantly less decrease in SMH due to acid exposure was observed in pellicle-coated enamel specimens. Pellicles formed at the buccal aspect of the upper molars were less effective in protecting the enamel against acid-induced softening as compared to pellicles formed at the lingual aspect of the lower incisors only after 5 min exposure in 1% citric acid. TEM analysis showed that pellicle layers were dissolved continuously due to acid exposure. However, even after 5 min exposure to 1% citric acid, a residual pellicle layer could be detected on the enamel surface. In conclusion, site-dependent differences of buccally and lingually in vivo formed 24-hour pellicles have minor importance concerning the pellicle-induced protection of the enamel surface against erosive changes.

Animals↗