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Biomedical subjects

K Stoltze

Publications and source records attributed to K Stoltze.

At least 55 records · Page 3Linked to original sources
PubMed1980

Concatenation of variations in plaque formation with variations in crevicular temperature.

The hypothesis was tested that variations in the temperature of gingival crevices are linked to variations in plaque formation. Fifty-nine abutment teeth to removable partial dentures were studied during four experiments, under various conditions of plaque formation, i.e. not brushing the teeth whilst wearing and not wearing dentures, and performing ordinary and then specialized tooth brushing whilst wearing dentures. The collation of temperature curves with plaque curves revealed a proportional relationship between the rate and magnitude of plaque formation and the rate and magnitude of the recorded temperature changes. Furthermore, the removal of plaque resulted in a reversal of induced temperature rises. The lowest crevicular temperatures were obtained with the practice of the specialized tooth brushing.

Adult↗
PubMed1980

Pattern of age related bone loss in mandibles.

A study was carried out to analyze the pattern of the age related bone loss in the mandibular cortex and to establish normal values and the observed range of morphometric variables on microradiograms of bone sections taken from a well defined site anterior to and below the mental foramen. Specimens were obtained from 100 Danish subjects with no known systemic bone disease or severe mandibular atrophy. Microradiograms of 100-micron-thin undemineralized vertical ground cross-sections were produced. An electric point-counting system was used for the determination of 1) percentage bone mass, 2) mean cortical width (MCW), and 3) the percentage of Haversian canals with resorption surfaces. The analysis showed that cortical porosity and the percentage of Haversian canals showing resorption are unrelated to sex and increased after the age of 50. MCW and absolute bone mass (MCW x % bone mass) are greater in males than in females and show a parallel age related decrease after the age of 50. Furthermore, the age related increase in cortical thinning and porosity is dependent on the individual as well as on age. Marked individual variation confined the use of these parameters to group analysis.

Adult↗
PubMed1979

Changes in bone mass in rat mandibles after tooth extraction.

An experimental study concerning changes in bone mass in trabecular bone of mandibles on rats after extractions of upper molars has been carried out. The material consisted of 32 SPF Wistar rats, fed on Nafag-184 only. Experimental and control groups consisted of eight females and eight males, each group having same average weight with respect to sex at the age of 16 weeks. At this age the upper right molars were extracted on all rats in the experimental group. The rats were sacrificed after 16 weeks. Identical increase in weight within each sex group was found. Microradiograms of two buccal-lingual 100-mu-thick ground sections at a distance of 0.5 mm through the first molar in each side of the mandible were used. Quantitation of bone mass (bone area in percent) of a trabecular bone was done by electronic point counting. No significant difference in bone mass was found between left and right sides in the control group (P greater than 0.50), whereas a significant difference was found between left and right sides in the experimental group (P approximately 0.0001) with lowest mean value in right sides. Conclusively the analysis shows that local reduction in bite force causes osteoporotic changes in trabecular bone of the jaw.

Animals↗
PubMed1979

Condylar displacements related to dynamic and static recordings of the comfortable zone.

In a previous study it was found that the distance between the borders of the comfortable zone was considerably wider when the zone was recorded statically rather than dynamically. However, it was not reported how condylar displacements may be related to the zonal borders. Therefore, an attempt is made in the present study to translate zonal border recordings into the equivalent amount of condylar rotation. Using a dental articulator, it was found that the condyles rotated 4.96 degrees, when the comfortable zone was recorded statically, and 2.50 degrees, when the zone was recorded dynamically. The difference, 2.46 degrees, was statistically significant (P less than 0.001).

Dental Articulators↗
PubMed1979

Oral temperatures in young and old people.

Oral temperatures were measured in ten young females and ten young males, and compared to oral temperatures measured in ten elderly females and ten elderly males. Each subject had a complete natural dentition. When analysed by sex, it was found that the temperatures in elderly males were lower than in young males (P less than 0.001), while temperatures in young and elderly females did not differ. Concerning sublingual temperatures, a difference of approximately one-third of a degree centigrade was demonstrated between the two age groups (P less than 0.005).

Adult↗
PubMed1979

Crevicular temperature rises stimulated by plaque formation.

In nineteen subjects, temperatures were recorded thermo-electrically in the vestibular and proximal crevices of fifty-nine teeth. It was found that the formation of a new plaque was followed by a rise in crevicular temperature. In addition, it was found that the normal as well as the abnormal crevicular temperatures were higher in the mandible than in the maxillae.

Adult↗
PubMed1979

Mucosal temperature rises following long-term use of full dentures.

Mucosal temperatures were studied in twenty-two subjects, who had worn full upper and lower dentures for at least 5 years. By comparing with a group of twenty-two fully dentate subjects, it was found that in the denture wearers, temperatures were increased significantly in the lower jaw, but not in the upper jaw.

Aged↗
PubMed1979

Age differences in cortical width of mandibles determined by histoquantitation.

A study was carried out to develop a histomorphometric method for indication of individual level of cortical width (MCW) and absolute cortical bone mass (MCW X % bone mass in mm3/mm2 bone surface) in the mandibular body and to demonstrate possible differences as to site, side, state of dentition, sex and age. The material consisted of autopsy specimens of mandibles. Microradiograms of 100-microns-thick buccolingual ground sections were used. An electronic point-counting system (Leitz-Classimat) was used for determination of MCW. The values for percentage of cortical bone mass have been given in previous studies. The analysis indicates that: 1) a reproducible measure for MCW in micron and absolute bone mass in a standard site can be obtained; 2) MCW in other sites of mandibular cortex deviates from that of standard site, which is why the same site has to be used in interindividual analysis; 3) MCW and absolute bone mass in the standard site are independent of side, state of dentition and sex, but show age-related decreases, while 4) the lingual cortex is unsuitable for interindividual analysis of MCW.

Adult↗
PubMed1978

Horizontal stabilization of upper and lower borders of the comfortable zone.

Using a screw jack device the upper and lower borders of the comfortable zone were recorded in a two step procedure designed to counteract bias inherent in previous measurements. In these measurements, successively increasing and decreasing values of zonal borders were recorded corresponding to a fully closed or fully opened starting position of the screw. Both of these positions are outside the comfortable zone. The two step procedure used a starting position which was supposed to lie inside the comfortable zone. However, the procedure did not achieve its aim fully. It succeeded only in stabilizing the lower border values. In the discussion hypothetical considerations are made concerning the neurophysiological mechanism underlying recordings of the borders of the comfortable zone, which might explain the differential behaviour of the zonal borders.

Adult↗
PubMed1978

Dynamic and static recordings of the comfortable zone.

A dynamic and a static method of assessing the comfortable zone by means of a screw jack were compared in 12 subjects. Recorded under dynamic conditions the average width of the comfortable zone was approximately 3.0 mm, and under static conditions approximately 5.0 mm (P less than 0.0001). It is suggested that in the dynamic experiments the larger output from receptors in the chewing system was responsible for the narrower zone, i.e. the more precise assessments of the comfortable zone.

Aged↗
PubMed1978

Age changes in the perception of comfortable mandibular occlusal positions.

It has been shown that a zone of comfort in maxillo-mandibular relationships in edentulous subjects can be identified with some precision. Whilst the neurophysiological mechanism involved has not been explained fully, the phenomenon is influenced by starting position and by fatigue. This experiment was set up to test the hypothesis that age is another significant factor in perception of the comfortable zone. A group of seventeen subjects with a mean age of 62 years and an equivalent younger group, the mean age of which was 28 years, were tested with Timmer screw jacks applied using the central approach to record the upper and lower limits of the zone fifteen times in succession for each subject. A linear statistical model was used to analyse the data from upper and lower borders separately. The results showed that the effect of making successive adjustments, whilst not significant statistically in the young group, was significant in the more elderly. Regression lines from the young group data were horizontal signifying the high degree of accuracy with which their perceptual mechanisms worked: the upwards inclination of those from the more elderly was interpreted as showing that initial appreciations were subjected to constant correction.

Adolescent↗
PubMed1978

Sex and age differences in bone morphology of mandibles.

Histomorphometric analysis of mandibular specimens has been performed in order to demonstrate possible sex and age differences in percent bone mass and bone activity in the mandible. The material consisted of 32 autopsy specimens from the right premolar region of the mandibular body in subjects with sudden unexpected death and without known bone disease. The subjects were divided in a young group (20--43 years of age) and an old group (60--90 years of age); each group consisted of eight females and eight males. Microradiograms of buccolingual ground sections of 100 micron were used. Quantitation of (1) percent bone area of cortical and trabecular bone and (2) total bone surface/bone area and resorption surfaces/total bone surface in trabecular bone, were done by electronic point-counting. The analysis did not reveal any significant sex or age differences in the trabecular bone with respect to percent bone mass, trabecular coarseness and bone activity. In the buccal and lingual cortices a significant age difference was demonstrated, but there was no sex difference in percnet bone mass. Cortical porosity in mandibles clearly increases with increasing age, but seems to be independent of sex.

Adult↗
PubMed1978

Histoquantitation on small jaw specimens.

A study is carried out to evaluate the possibility of obtaining a measure of bone mass and bone activity by histoquantitation on small jaw specimens. The material consisted of bone autopsy specimens from premolar regions of mandibles and regions above maxillary second incisors. Microradiograms of 100-micrometer-thick buccal-lingual ground sections were used. Quantitation of bone mass (bone area in percent), bone coarseness (total bone surface/bone area), and bone activity (resorption surfaces/total bone surface) was done in well-defined areas of cortical and trabecular bone by an electronic point-counting system. The analysis indicates that: (1) no further information or accuracy is obtained from measurements of large areas than of small areas of cortical or trabecular bone, (2) the bone mass in the buccal cortex anterior to the mental foramen is independent of side and state of dentition, and (3) maxillary specimens are unsuitable for quantitation of bone mass. A small bone specimen taken anterior to the mental foramen seems to be suitable for histoquantitation, when a reliable and representative measure of bone mass and bone activity in the mandible is desired for analysis of intermandibular differences.

Bone Resorption↗
PubMed1977

Ecologic changes in the oral cavity caused by removable partial dentures.

1. The introduction of a removable partial denture into the oral cavity adversely affects the prevailing ecologic situation in terms of plaque formation. 2. The rehabilitative effect of a removable partial denture may be safeguarded by controlling plaque formation by strict personal hygienic measures on the part of the patient. In particular, proximal surfaces adjacent to denture bases should be pointed out to patients as surfaces to which they must give special attention. 3. Simplification of the design of removable partial dentures can reduce their damaging potentialities. 4. Further prophylactic measures, such as topical application of fluorides and perhaps other chemicals, should also be taken.

Adult↗