摘要:

The objective of the study was to clarify some mechanisms behind the relaxing effects of chlorzoxazone. Motor effects induced by vibration of the masseter and digastricus muscles were studied in seven subjects. The response was measured by means of simultaneous recordings of EMG of masseter and digastricus as well as bite force. The measurements were performed before as well as after oral administration of 250, 500 and 1000 mg chlorzoxazone. Since no effect of the medication was seen, it was concluded that the muscle relaxing influences of chlorzoxazone are not effective on segmental levels. Large interindividual differences in responses to vibrations were observed.

ISSN:0001-6357    

DOI:10.3109/00016358109162703

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

The clinical relevance of previous tests for color stability of restorative resins has never been established. The present study has demonstrated that the color change produced in 15 proprietary composite resins by storing for one month in water at 60°C is well correlated with the color change obtained after storing for 12 months in water at 3TC. Thus, the former test may be assumed to be a clinically relevant accelerated tes for color stability of restorative resins.

ISSN:0001-6357    

DOI:10.3109/00016358109162704

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

In Gustavsberg, a suburb of Stockholm, a number of families with 3 year old children were invited to participate in a two year clinical study to demonstrate whether or not an invert sugar diet would lower the caries activity in comparison to a sucrose diet. About a quarter of the families (i.e. 67 children) accepted the offer, making up four invert sugar groups. The parents of the invert sugar groups were given lists of all articles of food available in a modern local supermarket and labelled»Allowed«or»Unsuitable«.»Allowed«were those free from sucrose and»Unsuitable«were all those containing sucrose. A number of other»caries risk products«such as candies, beverages, marmalades, jam, chewing gum etc. in which sucrose was substituted by invert sugar, were also offered at regular prices to the participants. Two contrast groups including 89 children of the same age, lived on ordinary diets and did not have access to invert sugar products. (The expression»contrast group«has been used in this study since these groups were not considered to be true control groups.)After the first year a moderate and insignificant caries reduction was observed in the pooled invert sugar group in comparison to the pooled contrast group. After the second year the caries reduction in dmfs was about 55 per cent (P<0.005). The reduction in dmfs over the two year study was 35 per cent and was statistically significant (P<0.01). Mean plaque and gingival indices for the invert sugar group decreased slightly after two years, whereas an increase was noted in the contrast groups. These differences were significant (P<0.05 and P<0.01, respectively).

ISSN:0001-6357    

DOI:10.3109/00016358109162705

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

The parotid gland of monkey (Cercopithecus ethiops) was examined by electron microscopy. Secretory granules show a bipartite, or sometimes a tripartite structure consisting of a main portion and of one or two dense bodies contained in it. Discharge of secretion into the lumen seems to take place following the fusion of the membrane of the secretory granule with the plasmalemma. This seems to take place with the dense bodies in intimate contact with the fusion-area of the granule membrane.

ISSN:0001-6357    

DOI:10.3109/00016358109162706

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

The morphology of the odontoblastic cell layer in the human dental pulp was analysed using freeze-fracturing technique. Numerous intercellular junctions were found between individual odontoblasts as well as between odontoblasts and subodontoblastic cells (Höhl's cells). These junctions were of the gap junction type. Tight junctions were not observed.

ISSN:0001-6357    

DOI:10.3109/00016358109162707

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

The distribution of groove patterns and the presence of the hypoconulid on the first and second permanent lower molars of 1010 Icelanders from one urban and two rural populations was determined from dental stone casts. There was considerable modification of the ancestral Y-pattern, as expected in a Caucasoid population. Neither the sexes nor the subpopulations showed significant differences in the groove patterns. The absence of the hypoconulid on the first molar was significantly more common in women than in men, and there was also some evidence of differences between the subpopulations. On the whole, the lower molar pattern of Icelanders was within expectations.

ISSN:0001-6357    

DOI:10.3109/00016358109162708

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

A new method for measuring the width of the periodontal ligament (PDL) in orthodontically treated rats has been presented. For the present experiment the first upper molar in twelve young adult Spraque-Dawley rats were moved buccally with forces up to 700 mN. The appliance used was modified according to Kvam (13) and Rygh (32). After 24 h the rats were sacrified and the sculls were embedded in carboxymethylcellulose and frozen. In a predetermined area the surfaces of the specimens were stained with silver-nitrate and photographed. Some sections were also collected on tape and stained with hematoxylin and eosin.The width of the PDL decreased with increasing forces following a logarithmic function. When the PDL was compressed more than 30% on the buccal side and 40% on the palatal side, red areas indicating extravasated blood were found in the pressure zones. Bending of the buccal alveolar plate was associated with strong orthodontic forces. The contralaterals to the orthodontically treated teeth were also affected.The method described seems to be the first attempt to systematically correlate the compression of the PDL to the strength of the orthodontic force and to allow a simultaneous evaluation of histochemical and histological changes.

ISSN:0001-6357    

DOI:10.3109/00016358109162709

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

For the present study some roughness parameters often used in dental research were defined and some of their properties discussed. The technique of filtration or cut-off as a means of distinguishing between roughness and curvature was explained and demonstrated in some specimens of dental amalgam.

ISSN:0001-6357    

DOI:10.3109/00016358109162710

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor