摘要:

abstract–The present paper describes a standardized system for diagnosing, recording and analyzing dental caries data, based on diagnostic criteria previously described. Each surface is examined, and the diagnosis is coded on punch cards and processed by computer. Different diagnostic levels can be used in diagnosis or analysis depending on the purpose of the study. Data can be analyzed using one or more programs contained in a program library. The advantage of this system in comparison with others seems to be the high degree of flexibility, making it possible to employ the system in many different types of studies (longitudinal clinical trials as well as cross‐sectional epidemiologic surve

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01488.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–The prevalence of malocclusion was studied in 6,398 Swedish schoolchildren They were divided into two groups. Group 1 consisted of 2,664 boys and 2,795 girls in the town of Umeå. The children were examined at 7, 10 and 13 years of age. Group 2 was made up of 429 boys and 510 girls referred from the district of Västerbotten and examined only once. Dental anomalies of the permanent teeth, and space and occlusal anomalies were recorded. Of the children in Group 1 73.8% had some form of anomaly. Of these, 52.3% were occlusal anomalies, 32.6% space anomalies and 14.9% dental anomalies. Of the referred children (Group 2) 44.8% had occlusal anomalies, while space and dental anomalies were equally common (29.4% and 25.8%, respective

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01489.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–The deodorizing effect in cases of foetor ex ore of a new mouthwash based on the principle of ascorbic acid oxidation has been investigated by means of a gas chromatographic method. The preparation was given to ten of 22 subjects whose saliva upon shorttime incubation and gas chromatographic head space analysis had shown rapid formation of malodorous sulfur volatiles. Dosage was one tablet four times a day for 1 d. Saliva was sampled the morning before and the morning after the day the preparation was used. The analysis showed total elimination or considerable reduction of the odorous compounds found in head space of saliva sampled in the morning the day after the treatment. The mechanism of this deodorizing effect is briefly discusse

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01490.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–The degree of demineralization of the enamel surface was evaluated by means of two different methods, namely by the32P uptake method, and by determining the calcium release directly, using atomic absorption spectroscopy. The accuracy of the32P uptake method was assessed. When applied on groups of young and old premolars separately, the32P uptake method proved to give reliable information about differences between the two groups with respect to the degree of demineralization under equal experimental conditions. For comparison the two methods were used simultaneously in 20 separate tests with varying experimental conditions. The comparison of the results obtained by the two methods showed very good correspondenc

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01491.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–The enamel organ from the rat incisor was dissected out. The amount of connective tissue in the samples was checked by light microscopy. Samples representative of the stage of enamel matrix formation and of enamel maturation were taken and the activities of the following enzymes were estimated: aldolase, pyruvate kinase, lactate dehydrogenase, malate dehydrogenase, glucose‐6‐phosphate dehydrogenase and alkaline phosphatase. The enzyme activities were related to the amount of tissue protein and the amount of DNA. All the enzymes, except alkaline phosphatase, showed an increase in measured activity during the stage of enamel maturation. The significance of these changes inin vitroactivities is disc

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01492.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–Three strains of oral streptococci were grown in dextrose broth, washed, and re‐suspended in saline (1.0 ml) containing 0.6 and 5.7 parts/106fluoride. The final suspensions also contained an inert dilution indicator (51Cr‐EDTA). This water‐soluble, non‐absorbable compound was added to compare its distribution with that of fluoride. The concentrations of fluoride and51Cr‐EDTA were determined in the supernatants of the bacterial suspensions. A linear relationship was noted between the volume of the bacteria and the increase in concentration of51Cr‐EDTA. The fluoride concentrations were independent of the amount of bacteria, indicating that the bacteria were permeable to fluoride. The recovery of fluoride from the supernatants and the water used for washing of the bacteria amounted to 97 ± 2%. The fluoride which was demonstrated in washed and dried bacteria seemed to be due to an incomplete washing. Neither direct nor indirect fluoride determinations indicated that fluoride was concentrated i

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01493.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–Following elevator luxation of the mandibular first right molar in 36 10‐weekold male Wistar SPF rats, three different kinds of external root resorption were observed.Surface resorption, found mainly on the sides where pressure was exerted, was recorded histometrically from 3 to 21 d after the trauma. Surface resorption increased considerably from the third to the tenth day, and no definite repair occurred within three weeks. The extension of areas with resorption decreased markedly in the apical direction on the root surface due to a tipping movement of the first molar during luxation.Inflammatory resorptionwas seen in association with an inflammation located between the first and second molars, and caused by the elevator.Replacement resorption(ankylosis) occurred on the pressure sides within 14–21 d after the trauma. Hyalinization of the periodontal membrane was seen on the pressure side. Osteoclastic bone resorption occurred on the pressure side as well as on the tension side and in the marrow spaces. Bone resorption later changed to bone formation and periodontal conditions became normal within three weeks. On the external surfaces of the mandible, periosteal bone formation was seen. No degenerative changes occurred in the

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01494.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–From a material of 55 rats in which one maxillary molar had been moved buccally with a fixed orthodontic appliance, four specimens showing crystal‐like structures in pressure zones in the periodontal ligament were studied with the electron microscope. Crystals which occurred within the lumen of enlarged blood vessels appeared to have formed by direct transformation of erythrocytes. Crystals were also seen in extravascular locations. These particles seemed to have formed by solidification outside the blood vessels of substances released from degraded red blood cells. Many particles revealed a highly ordered internal structure thought to reflect the unit cell arrangement of the crystalline substance. On the basis of their location, internal structure, and the experimental circumstances, it was concluded that the crystals represented hemoglobin, rather than hematoidin, ferritin or hemosiderin. The study indicated that under the special conditions of pressure and hemostasis that existed in the periodontal ligament as a result of the experimental procedures, local degradation of erythrocytes occurred in a few specimens by mechanisms different from the physiologic breakdown of red blood cells in the spleen, liver and bone mar

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01495.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

abstract–The periodic acid‐Schiff (PAS) and the alcian blue stainability of young human and monkey apical pulps have been studied, employing fresh‐frozen sections, as well as paraffin‐embedded sections of undemineralized and demineralized tissue. Two regions containing coarse magenta granules were observed in the growing pulp: a PAS‐positive zone adjacent to the periodontal tissue, and a proximally situated basophilic area. Clusters of magenta‐colored granules were present at the distal end of the pulp, and their number and size gradually diminished coronally. Amylase digestion indicated that the coarse granules may have been glycogen. The magenta granules were most easily demonstrated in formaldehyde vapor‐fixed fr

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1973.tb01496.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY