摘要:

Abstract –The influence of formocresol treatment on the pulp tissue of 24 primary monkey teeth was studied using tetracycline and3H‐proline labeling techniques. Six untreated monkey teeth served as controls. The tetracycline labeled teeth were examined between 352 and 600 d, following treatment. The3H‐proline labeled teeth were observed over a period of 22–607 d, the isotope being administered 15 d before extraction. The labeling was evaluated in the coronal, middle and apical area of the roots. Dentin formation as indicated by tetracycline labeling was observed in both control teeth and successfully treated teeth, as well as in some of the unsuccessfully treated teeth. The average dentin formation rate per day varied from 1 μm in the control teeth to 0.14 μm in the pulpotomized teeth (P<0.01). Success of treatment was of significant importance for the amount of dentin formation (P<0.001). Labeling with3H‐proline, indicating collagen synthesis, could be observed in the pulp and predentin of the majority of areas judged to be normal, degenerated or inflamed. Labeling was not observed in fixed or necrotic tissue. In degenerated pulp tissue the proline labeling was clearly reduced. The findings indicate that dentin formation and collagen synthesis may take place in formaldehyde influenced pulp tissue although at a dec

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00701.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Adhesion ofStreptococcus sanguis, Fusobacterium nucleatumand anActinomyces sp. to enamel and epon and their interspecies cohesion was studied with scanning and transmission electron microscopy. For adhesion studies enamel or epon was coated with salivary macromolecules and then cells ofS. sanguisand in some experiments also withF. nucleatumorActinomyces sp. Cells ofS. sanguiswere seen scattered over the surface of a thin “pellicle” that was heavily stained, andF. nucleatumandActinomyces sp. adhered toS. sanguisor directly to the “pellicle”. For studies of cohesionS. sanguiswas brought to cohere withF. nucleatumorActinomyces sp. and then processed for transmission electron microscopy. The morphology of the cell surface structures involved was studied in negatively stained preparations or in thin sections of material treated with ruthenium red or poststained with uranyl and lead salts, phosphotungstic acid or periodic acid‐thiocarbohydrazide‐osmium tetroxide.S. sanguisdemonstrated a fuzzy coat of fimbriae that seemed to unfold in areas of contact with other cells, while cells ofF. nucleatumhad 6–10 polar pilus‐like fimbriae, which appeared to be instrumental in cohesion, as did a dense coat of long, slender fimbriae that covered cells

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00702.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Anin vitromodel for the purpose of testing the access to interproximal tooth surfaces by toothbrushes is described. The model was used to compare the access of different bristle designs and stiffnesses. Two standardized brushing techniques were used: a horizontal and a vertical one. The test method discriminated significantly between different bristle designs and stiffnesses. With regard to interproximal access the V‐shaped bristles were superior to the straight multitufted ones and soft bristles were better than medium and stiff ones. This study also indicated that the interproximal access increased with increasing pressure within the pressure range chosen. Of the two techniques used in this study the vertical one was superior to the horizontal. The results indicated that some current opinions with regard to mechanical cleaning should be re‐evaluated and clinical testing methods be further developed to enable correspondingin vivote

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00703.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The blastogenic response of peripheral blood leukocytes to lipopolysaccharide (LPS), phytohemagglutinin (PHA) and LPS/PHA mixtures was followed over a short course of experimental gingivitis in elderly subjects (65–81 years) who strictly avoided oral hygiene procedures for periods up to 9 d. The leukocytes responded poorly to LPS, PHA and to LPS/PHA combinations. The concomitant heightened sensitivity of the gingiva to dental plaque among the elderly subjects may relate to the altered leukocyte response in this age gr

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00704.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Serial sections of 182 human fungiform papillae, obtained at autopsy from 22 individuals aged 2 days to 90 years, were examined by light microscopy with regard to location and number of taste buds. The taste buds were always found on the convex, dorsal surface of the papillae but otherwise failed to display any preferential location pattern. A total of 262 taste buds, an average of 1.4 per papilla, were found. However, there was considerable variation in the occurrence of taste buds, both from papilla to papilla and from case to case. While the number of taste buds in a single papilla varied from 0 to 27, 63% of the papillae had no taste buds at all, 26% had 1–3 buds and the remainder 4 or more buds. The mean number of taste buds per papilla varied from 0 to 9 between individuals; no dependence upon sex or age could be demonstrated for this variation. The significance of these anatomical findings with regard to physiological studies on taste involving the fungiform papillae is discus

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00705.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The appearance of prepared cavity walls after treatment with different cavity cleansers and cleaning procedures was studied. Class II and V cavities were prepared on extracted human and monkey teeth and the cavities were exposed to the different agents for 1 min. Where commercial products were used, the manufacturers' directions for use were followed. The cavity walls were examined in the scanning electron microscope and representative photos were taken from dentinal and enamel areas. Only demineralizing solutions producing an etch pattern were able to remove the smeared layer from the cavity wall

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00706.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Radioactive chromium, cobalt, gold and mercury, all of which may occur as corrosion products from dental restorations, were injected in single doses via the tail vein of mice and an invivoanalysis of their distribution was performed using whole‐body autoradiography. Gold seemed to be inert and went mainly to the liver and bones. The other elements studied were distributed widely in the body and remained for a long period of time in specific target organs and tiss

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00707.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The clinical quality of 203 mesio‐occlusal Class II and 127 buccal Class V restorations of 246 persons aged 25 years were studied. One third of the amalgam restorations were considered to be unacceptable. Marginal overhang was the prevailing type of failure (17%), recurrent caries occurred at 12% of the restorations, unacceptable proximal contact at 10%, unacceptable marginal adaptation at 8% and isthmus fractures a

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00708.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The levels of mercury and silver in dust arising from the trimming, i.e. grinding, of amalgam dies in dental laboratories have been measured. In breathing air close to the workpiece, the mercury and silver contents exceeded the threshold limit values for short‐term exposure by factors of about 60 and 400 in cases when local ventilation was not in use. With efficient local exhaust systems enabling a dust reduction of about94%, the short‐term exposure limit values for mercury and silver were exceeded by factors of about 4 and 20 respectively. Mercury and silver were assayed quantitatively by means of nuclear chemical analysis. A major part of the amalgam dust consisted of respirable particles. The collected dust comprised about 80% amalgam and 20% particulate matter from grinding wheels and stones according to SEM and EDAX measure

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00709.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Six brands of silicate cements have been characterized by means of optical emission spectrography with respect to the contents of elements in minor or trace quantities in a search for presence of possible toxic elements. Beryllium was observed in two powders at levels of 1.3 and 1.6%. Cadmium was found in two powders at levels of 0.02 and 0.03%. Lead was measured in three powders at levels of 0.001–0.003%. Bismuth, boron, copper, gallium, iron, manganese, titanium, tin and zirconium were found in various brands in either powder or liquid at levels of 0.001–0.1%. Upper limits of the amounts of the various elements that might be transferred to the gastrointestinal tract after dissolution of the cement matrix in the oral cavity have been calcu

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00710.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY