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Biomedical subjects

S K Thoden van Velzen

Publications and source records attributed to S K Thoden van Velzen.

At least 19 recordsLinked to original sources
PubMed2005

[Root canal treatment. Quality and result].

The correlation of root canal treatment quality and the probability of healing of apical periodontitis are discussed. Noted is the often large discrepancy between treatment outcomes observed in prospective studies and those obtained in cross-sectional studies of general populations. Looking for improvement of the latter, those treatment shortcomings are discussed which have a known or suspected negative impact on the probability of healing or preventing periapical pathology.

Humans↗
PubMed1990

Value of the teeth.

A random sample of 542 respondents answered questions concerning the value assigned to the teeth, dental attendance pattern, oral health status, and dental anxiety. Non-linear multivariate analysis showed the data regarding value attached to the teeth to contain two dimensions, of which the second one was deleted due to extreme answer patterns (skewed distributions) on the pertinent variables. Repetition of the analysis, including a plot of the respondents, made it possible to discern four subsamples, characterized by specific answer patterns. In the discussion attention was given firstly to the separate variables estimating the value attached to the teeth, and next to the four subsamples, taking into consideration the dental attendance pattern, oral health status, and dental anxiety. It was concluded that the multivariate approach reveals that the respondents are of a rather high heterogeneity.

Adult↗
PubMed1988

Personality traits of patients suffering extreme dental anxiety.

In order to investigate the relationship between dental anxiety and some personality traits, a group of 103 patients suffering extreme dental anxiety and therefore enrolled in a special treatment program were compared with controls sampled at random. The mean scores of the controls on dental anxiety measurements and on questionnaires dealing with personality traits were transformed into 50 with standard deviation equal to 10 to make them mutually comparable, and these subsequently were used as reference points, from which the likewise transformed mean scores of the anxiety group have to differ substantially if both groups stem from different populations. The mean scores were tested for difference with ANOVA. It appears that the anxious patients are more neurotic, i.e. more unstable, than the controls. Moreover, the patients feel themselves more uncertain with regard to having control, are less decisive, have a lower self-esteem, are less inclined to act and are, in general, anxious persons. These findings may have implications for selecting the most appropriate approach for amelioration of their anxiety or support of their coping capacity.

Adolescent↗
PubMed1986

Psychologic correlates of dental anxiety.

In an attempt to establish the relationships between dental anxiety and personality traits, such as neuroticism and locus of control, a survey has been carried out among 30-40-yr-olds in a Dutch town. In the first instance, the questionnaires comprising the psychologic items were treated by Non-Metric Principal Components analysis to detect the underlying structure. The principal components found were then used in a second-stage analysis. The results appear to be at variance with the literature, i.e. subgroups discernible in the sample by sets of psychologic features were not associated with dental anxiety categories.

Adult↗
PubMed1986

Clinical measurement of dental anxiety.

The mean scores on five dental anxiety measurements of 60 patients suffering from extreme dental anxiety are compared with those of an equal-sized, matched group of regular dental attenders free from dental anxiety. Four of the measurements, especially Corah's DAS, appear to be suitable for distinguishing persons suffering from extreme dental anxiety. Also, persons with extreme dental anxiety appear to express their fear openly.

Anxiety↗
PubMed1985

Abscess formation induced in rabbits with bacteria-filled subcutaneous implants that simulate the infected dental root canal.

Short-term and semi-long-term tissue reactions to a mixture of "endodontopathic" bacteria are described. The bacteria are enclosed in experimental implant tubes simulating some aspects of the infected dental pulp. Localized abscesses develop in response to mixed bacterial contents of the implants. No abscess formation occurred with pure cultures (that is, either component of the mixture). Pathogenic inocula attract leukocytes to the adjacent tissues, which become inflamed and cause influx of leukocytes into the lumen of the implant proper.

Abscess↗
PubMed1985

Dimensionality of dental anxiety measurements.

A survey among 620, 30-40-yr-olds, was carried out in order to measure dental anxiety with Corah's DAS, Weiner's AALC, and some other questions on anxiety, among which was the duration of psychophysiologic responses prior to a dental appointment. The data were analyzed with a Non Metric Components analysis. The DAS turned out to be unidimensional. The AALC on the other hand appeared to contain four components. A second stage analysis comprising the DAS component, the four AALC components, and the remaining variables revealed a two-dimensional structure, of which only the first component is dentistry related. This component showed better differentiation of the respondents than with DAS or AALC alone. Part of AALC's questions and a question about anxiety in daily life proved to be superfluous for measuring dental anxiety. It is concluded that dental anxiety and anxiety in general have to be measured with questions covering different aspects.

Adult↗
PubMed1985

Influence of repression upon the measurement of dental anxiety.

Using a non-linear, multivariate analysis, the resistance against admitting to being dentally anxious was studied. Dental anxiety was found to be repressed by a subgroup, among them more men than women, of a sample, who also repressed the feeling of low self esteem about tooth loss. Based on the results, regular and irregular dental attenders can be separated almost perfectly. The relationship with other anxiety measurements, i.e. Corah's Dental Anxiety Scale and three components discernible in Weiner's Anticipation Anxiety Level Chart, was studied.

Adult↗