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Biomedical subjects

W Kalk

Publications and source records attributed to W Kalk.

At least 91 records · Page 5Linked to original sources
PubMed1990

Edentulism and preventive goals in the treatment of mutilated dentition.

The percentage of edentulous people is expected to decrease in the coming decades as a result of improved oral health, whereas the number of edentulous people will increase as a result of the strong increase in the ageing population. If the preservation of the natural dentition is no longer possible, the remaining teeth of a multilated dentition have to be extracted according to specific principles. Within the framework of the so-called 'preventive-prosthetic-treatment strategy', preservation of the alveolar ridge is the main goal.

Adult↗
PubMed1989

Some factors connected with alveolar bone resorption.

In this study correlations are described between alveolar bone resorption, patient's age, duration of edentulousness, the number of dentures which have been worn, and dentures being worn day and night. The sample of patients for this study consisted of 92 edentulous persons treated with complete dentures at a dental school clinic. The test subjects were asked to fill in a questionnaire to obtain data regarding the research factors. A method for the classification of alveolar bone resorption was developed and the test subjects were divided into classes for alveolar bone resorption according to this method. All data were processed by means of a computer program. The longer the test subjects had been edentulous and the more dentures they had worn, the more intensive was the alveolar bone resorption, particularly in the lower jaw. No significant correlation was found between alveolar bone resorption and dentures being worn day and night.

Adult↗
PubMed1989

Eleven-year study of hydroxyapatite implants.

An 11-year clinical research study was conducted with both unloaded bulk hydroxyapatite implants and loaded hydroxyapatite-coated titanium implants. A total of 102 submerged bulk hydroxyapatite implants were placed after extraction of teeth to maintain the volume of the residual alveolar ridge by their physical presence. All 21 implants under fixed partial dentures and 51 of 81 implants under lower complete dentures remained submucosal. A total of 71 hydroxyapatite-coated titanium implants were connected with permucosal superstructures by use of a two-stage method. Modifications in design and in implantation technique were required. This long-term research indicates that cylindrical hydroxyapatite implants are reliable devices as natural tooth root substitutes that bond directly to bone instead of simply being osseointegrated.

Dental Abutments↗
PubMed1989

[Preserving alveolar bone with submucosal hydroxyapatite].

In this article the use of hydroxyapatite granules to prevent alveolar bone loss after extraction of teeth is described. Twenty-six alveoli were treated in the mandible and the maxilla. The used method resulted in a delayed healing of the wound and loss of a part of the implants. On the account of the results it is recommended to close the extraction wound completely when using hydroxyapatite granules and to limit the indication to the mandible.

Alveolar Ridge Augmentation↗
PubMed1989

[Implants with plasma spray coatings of hydroxyapatite: an experimental study in alveolar bone].

Sintered hydroxyapatite ceramic can be coated to a titanium core by means of a high temperature plasma spray procedure. The biological response of alveolar bone to an implant with such a coating of hydroxyapatite was evaluated in an animal experimental study. The results indicated that the plasma spray coating gave a very strong and direct bonding to cortical alveolar bone. The shear strength between bone and ceramic was greater than the shear strength between ceramic and titanium. From a radiological, macroscopic and microscopic point of view the conclusion could be drawn that the biological properties of a plasma spray coating of hydroxyapatite are the same as the properties of bulk hydroxyapatite ceramic. The outermost layer of the hydroxyapatite coating appeared to be unstable under the experimental conditions.

Animals↗
PubMed1989

[Changes from aging].

Expectations concerning the future of the oral health of the Dutch elderly and the quantitative results of a computer simulation model are put together. On an individual level no major changes in the oral health of the elderly dentates are to be expected. The ageing of the population and the decrease of the percentage of edentulous patients will result in a strong increase of the number of elderly people who need regular dental care. Due to the increasing age at which people become edentulous, no increase of treatment related to atrophic edentulous jaws is to be expected. On the other hand the introduction of new treatments, like the use of oral implants, might result in an increase of treatments of this kind.

Aged↗
PubMed1989

[Natural dentition of the elderly. An occlusal concept].

Treatment of the impaired dentition of the elderly has to be focused on maintaining the strategic natural teeth. This means not necessarily the preservation of all teeth. At least a minimal functional level should be preserved.

Aged↗
PubMed1989

[Dental service for nursing home residents in The Netherlands--the present situation].

In order to establish adequate dental care for nursing home residents it is important to gather information about the present situation. For that purpose a questionnaire was sent to dentists who were involved in this field of dentistry. The results indicate that dental care for nursing home residents has to be improved. In order to attain this improvement the dental service for nursing home residents should be better organized and research should be carried out with regard to the specific problems arising in treating these patients.

Aged↗
PubMed1989

[Oral stereognosis test in patients with complete dentures].

An oral stereognosis test was performed in patients with complete dentures. Two groups were selected: patients without complaints of their dentures of professionally assessed poor quality and patients with complaints of professionally assessed good dentures. There was no statistical significant correlation between the measure of scores of an oral stereognosis test and the presence of complaints related with the dentures.

Denture Retention↗
PubMed1988

[Sequelae of tooth loss for the potential for chewing in the elderly].

The dentition is a part of the orofacial system. It has important functions such as speech and chewing. However the question is whether masticatory function declines when more loss of teeth occurs. In this article attention is given to the masticatory process and the masticatory performance in relation to complete or partial tooth loss and to the question to which requirements the dental prosthesis has to come up in relation to the food intake and the masticatory performance.

Aged↗
PubMed1988

[Reduction of the alveolar ridge: causes, sequelae and prevention].

The alveolar ridge (of upper and lower jaw) serves as a supporting tissue for the teeth. This function disappears after natural dentition has been extracted. Even so, the alveolar ridge remains very important, serving as it does to support and give retention to dentures. However, after removal of the natural dentition alveolar ridge reduction occurs, initially at a fairly rapid rate, slowing down later, but in an ever-continuing process, which, particularly in the long run, may have unpleasant consequences. As many factors may affect this reduction process unfavourably, it is very difficult to take one specific preventive measure. The most effective way of preventing alveolar ridge reduction is obviously the prevention of any edentulous condition, which unfortunately is not always possible. Nowadays a frequently used treatment of which a great deal is expected, is the application of the so-called overdenture. Further research is needed, however, for a proper evaluation of its long-term favourable effects on alveolar ridge reduction.

Aged↗