摘要:

With the aid of questionnaires symptoms of mandibular dysfunction and some general and oral conditions were studied in a group of previous patients and in a randomly selected population sample. From the two materials answers were obtained from 82 persons (81 %) and 1.106 (91 %) respectively. The results confirmed that women are heavily overrepresented in patient materials. This differs from the fairly equal sex distribution found in population studies of mandibular dysfunction. The most frequent symptoms of mandibular dysfunction were TMJ-sounds which appeared in 39 and 79 % and pain on opening the mouth which appeared in 12 and 42 % of the population and patient samples respectively. All symptoms of mandibular dysfunction, headache, clenching of the teeth and unilateral chewing appeared significantly more often in the previous patients, but the number of natural teeth did not differ in the two samples. The general state of health was poorer and general joint—muscle symptoms were more common in the previous patients as well as in those of the population sample with symptoms of mandibular dysfunction. This finding suggests that functional disturbances of the masticatory system often may be related to impaired general health.

ISSN:0001-6357    

DOI:10.3109/00016357509027560

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor

摘要:

In a Finnish rural population 79.0 % of 233 persons had the cusp of Carabelli in first upper molars. Of these 20 % showed |DA positive cusps |DA. and 59 % |DA negative cusps |DA. The occurrence of the structure was bilateral with varying degrees of asymmetry, but if there was no structure on one side of the jaw, the other never showed the cusp. There was no sexual dimorphism either in the occurrence or in the degree of expression of the character. Results of the statistical analyses suggested low heritability of the character. However, the dichotomy of having a cusp or not may have genetic basis, but there is large variation in the expression of the |DA cusp-genotype |DA.

ISSN:0001-6357    

DOI:10.3109/00016357509027561

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor

摘要:

The dissolution rate of cadmium from six different dental gold solder alloys was determined in anin vitropotentiostatic study. The measurements were made in the potential range 740—880 mV and attempts have been made to extrapolate the results to a potential region that might in reality occur in the oral cavity. For comparison the dissolution rates of copper and zinc were also determined. Electrochemically the most interesting quantity was the logarithm of the dissolution rate because it is a linear function of the applied potential. This linear relationship was given by the Tafel equation. The dissolution rate of cadmium was shown to be rather small even under circumstances which may be said to represent very unfavourable conditions within the oral cavity.

ISSN:0001-6357    

DOI:10.3109/00016357509027562

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor

摘要:

Forty pairs of posterior bitewing radiographs taken at the third and fourth annual examinations of three-year clinical trials were assessed twice for caries by one examiner in independent recording sessions. Three or four degrees of caries were recorded in order to determine how different scales of measurement affected approximal caries progression patterns. The use of one degree of enamel caries, instead of two reduced by about half the percentage of lesions which appeared to have progressed during one year. Most lesions seemed to remain unchanged during the 12 months of observation and those which advanced usually progressed across one demarcation line. Reversals of caries diagnosis and regression of lesions to a lower degree of caries contributed least to the pattern of change between the two examinations. It is concluded that the radiographic scoring codes with two degrees of enamel caries give a better picture of caries progression than those with only one.

ISSN:0001-6357    

DOI:10.3109/00016357509027563

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor

摘要:

Aminopeptidase activities were studied biochemically from the supernatants of the homogenates prepared from the normal and post extraction palatal mucosa of the rat. The determinations were carried out at 0.5, 1, 2, 4, 8 and 16 hours and 1, 2, 3, 5 and 7 days following extraction using N-L-aminoacyl-2-naphthylamines of arginine, glycine, leucine, proline and valine as the substrates. In addition, in the second part of the study the hydrolysis ofN-L-aminoacyl-2-naphthylamines of alanine, histidine, isoleucine, lysine, phenylalanine, serine, threonine, tyrosine and valine was tested at I, 3 and 5 days following extraction. The effect of chloride ions (0.2 M NaCl) on the hydrolysis of arginine and lysine derivatives was also tested. The specific activities of aminopeptidases obtained from the extraction-wound side were compared to those of the control side at each time interval. Tooth extraction caused a considerable reduction in the specific activities of aminopeptidases in the surrounding palatal mucosa immediately after extraction (at 0.5 hr.). The specific activities in the wound tissue remained generally below the control levels for 24 hours and reached their maximum within 5 days following extractions. The highest relative increase was obtained with N-L-valyl-2-naphthylamine. Arginine aminopeptidase was activated by chloride ions on an average 20 per cent more in the wound tissue than the control. This effect can be considered suggestive of the activation of aminopeptidase B in the post extraction palatal mucosa.

ISSN:0001-6357    

DOI:10.3109/00016357509027564

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor

摘要:

Rat frontal bones reportedly exhibit lateral surface growth many weeks after fusion of the frontal suture. This is histologically confirmed in the present study. The mean width of the cranial vault at the postorbital constriction increased by 10 % between the age of 30 and 58 days. The increase must be ascribed to periosteal growth, as the lateral, external surfaces exhibited active growth. External apposition without concomittant internal resorption causes an increase in bone thickness. The cells on the internal surfaces were in a state of rest. The study was based on a limited material; therefore, definite conclusions cannot be drawn.

ISSN:0001-6357    

DOI:10.3109/00016357509027565

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor

摘要:

Cavities were prepared in 43 bicuspid teeth using two general categories of cavity depth. In the |DAdeep|DA cavities the bottom was placed in the inner third of the dentin. In the |DAintermediate depth|DA cavities the bottom was positioned in the middle third of the dentin. The bottom of the cavities was either rubbed with calcium hydroxide, covered with calcium hydroxide, or left unlined before filling according to the wet amalgam technique. The teeth were extracted after 1 week and examined histologically. All cases, except 2 with deep and 1 with intermediate depth rubbed cavities, showed local vascular dilatation in the pulp underneath the cavity. In addition, all teeth with deep unlined cavities showed inflammatory cells as did 1 with an intermediate depth unlined cavity. There were fewer displaced odontoblast nuclei in the dentin in the calcium hydroxide-treated groups. The milder reactions in the rubbed or covered groups are probably due to the restrictive effect by calcium hydroxide on penetration of amalgam components. In the teeth with deep cavities there were only minor differences between the ones which had been rubbed and those which had been covered with calcium hydroxide.

ISSN:0001-6357    

DOI:10.3109/00016357509027566

出版商:Taylor&Francis    

年代:1975

数据来源: Taylor