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Biomedical subjects

G Boere

Publications and source records attributed to G Boere.

9 recordsLinked to original sources
PubMed1995

Influence of fluoride on titanium in an acidic environment measured by polarization resistance technique.

The effect of sodium fluoride on the polarization resistance of titanium was investigated. Titanium plates were exposed to sodium chloride solutions with increasing fluoride concentrations. This was done at pH 7 and 4 at 37 degrees C. The polarization resistance technique was chosen because it is the only electrochemical corrosion test procedure that allows sequential measurements of the same specimen and provides a quantitative basis to estimate corrosion currents unlike measurements of the potential. The results showed a large decrease in polarization resistance with increasing fluoride concentration at pH 4. The polarization resistance at pH 7 remained constant after a slight decrease at a very high value, even with a high fluoride concentration. The results clearly confirm that titanium is attacked by fluoride in an acidic environment. The clinical implications are that fluoride rinses or fluoride gels must have a neutral pH if there is a titanium containing device in the oral environment despite the less prophylactic effectiveness.

Biocompatible Materials↗
PubMed1994

[Amalgam. XV. Electrochemical activity in the mouth].

Almost all metals used in dentistry can corrod. The uniform corrosion is not so important in concern to the used metals. This type of corrosion may become important in an extreme environment with the low pH which can exist in plaque, denture adhesive and fluoride gel. An important type of corrosion is contact corrosion, which results in a higher corrosion rate of the base metal in the galvanic couple noble-base metal. As a result of the small io (exchange current dentistry) the higher corrosion rate is the result of a larger reaction surface for the reduction reaction. Another important type of corrosion is caused by differences in the surface. As a result of this differentiation pitting or crevice corrosion may occur. Also bacteria and other micro-organisms can have an influence on the corrosion process. The corrosion rate is not only determined by the redoxpotential but also by other factors.

Corrosion↗
PubMed1994

[Amalgam. XIV. Oral galvanism].

Although 'oral galvanism' is associated with corrosion, it seems to be an irrelevant phenomenon. It is very difficult to measure correctly electric currents in the mouth, if possible at all, and the value and significance of the results are questionable. Occasionally a patient may perceive an electric current, i.e. pain or taste sensation, due to intermittent contacts between restorations of amalgam and gold. A damaging effect, however, has never been proven.

Dental Amalgam↗
PubMed1991

[Waterbed dentures: clinical studies (2)].

In this study the clinical performance and applicability of the liquid supported denture were investigated. Functional properties such as retention and stability were studied, as well as the reaction of the supporting tissues to the denture. It was concluded that the liquid supported denture is well accepted as alternative denture and provides a solution in a variety of prosthodontic problems, especially in cases where the mandible is in an advanced resorbed state.

Adult↗
PubMed1990

Liquid-supported dentures. Part I: Theoretical and technical considerations.

A complete denture is designed so that the base is covered with a preshaped, close fitting, flexible foil containing a thin film of high-viscosity liquid. This technique allows continued adaptation and eliminates the disadvantages of denture designs based on the application of temporary tissue conditioners or soft liners. In contrast to the traditional tissue conditioners and soft liners, the foil remains elastic and preserves the plasticity of the liquid.

Denture Bases↗
PubMed1990

Liquid-supported dentures. Part II: Clinical study, a preliminary report.

A clinical study was made of 11 selected patients wearing liquid-supported dentures. The experiences and opinions of the patients were assembled and the results are discussed. The most important conclusions of this study are that it is possible to make a liquid-supported denture that in general fits and feels comfortable, has proper retention, a slightly diminished masticatory function, and that can provide a solution to some problematic prosthodontic situations.

Adult↗
PubMed1990

[Waterbed lining of dentures].

The necessity of proper fit and various methods of correction of defective fit of full dentures are discussed. The construction and application of a waterbed lining at the mucosal side of a denture is given and arguments are presented why such a 'continuous rebasing' construction eliminates a series of disadvantages of the existing lining systems and offers several additional advantages to the functioning of a denture.

Denture Liners↗