摘要:

ABSTRACT –During routine orthodontic screening in Oslo, Norway, of 3,157 children, aged 10–11 years and born in 1963/64, 36 Cases (1.14%) with cosmetically marring discoloration of permanent front teeth were registered. Thirty‐four of them arrived for a more exhaustive examination, which in 24 of the children revealed positive tetracycline fluorescence on exposure to ultraviolet light. In 13 (0.4%) of the children, the discolorations were diagnosed to be tetracycline‐induced. Enamel hypoplasia was frequently found in teeth with positive fluorescence. Multiple exposures to various tetracydines were reported in all children who exhibited positive fluor

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01924.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –This paper is a continuation of three previously published papers giving a long‐term clinical evaluation of an ultraviolet hght polymerizable fissure sealant method. The present findings revealed that of the 156 permanent teeth available for study 5 years after initiation, 59.6% retained the sealants in good condition, while 25.6% of the sealants were missing or partly missing. During the test period, 37 (32.2%) of the 115 sealed permanent first molars had become carious, while 92 (80.0%) of the respective paired controls had decayed. An analysis of the efficacy of the treatment on the test‐control tooth pairs showed a net gain of 55 and a percentage effectiveness of 59.8%. The sealed teeth were found to be highly significantly less decayed than the respective controls (P<0.001). Of the individual subjects, 73.4% were found to have benefited from the trea

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01925.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –The adhesion to acid‐etched enamel of a four‐component composite, Concise® Enamel Bond System, was studied. The composite was applied undiluted over an intermediate resin layer and diluted with different amounts of resin. Corresponding surfaces of contralateral premolars were used to ensure that the composite samples were tested on areas with similar enamel etch patterns. Eighty specimens were tested. The results of this study indicated that the adherence of undiluted composite to etched enamel surfaces was not improved by using an intermediate layer of low‐viscous resin. Composite diluted with liquid resin had poorer adherence than undiluted composite. There was no difference in the results from two degrees of

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01926.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –The use of composite resin crowns in the restoration of traumatized and hypoplastic permanent incisors has proved to be of great clinical and aesthetic value for the pedodontic practice. Due to the composite resin materials and the acid etch technique, an easy method of making and retaining the restorations is at hand. The present study deals with long‐term observations of composite resin crowns in restoring Ellis Class II and Class III coronal fractures of traumatized permanent incisors. In all, 253 composite resin crowns were controlled every year for a minimum of 5 years. In no case was an intermediate resin layer applied on etched enamel before the restoration material was placed. Surface, marginal and “body” discoloration, marginal leakage, marginal caries, abrasion, and fractures were controlled. The study demonstrated that discoloration of the surface of the restorations, and a discoloration of the restorative material not restricted to its surface (“body” discoloration) were the most frequent causes for considering the crowns as semipermanent restorations. The other factors seemed to be of minor clinical s

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01927.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –Dentin production and longitudinal growth of maxillary incisors in female rats, age 60–95 d, were determined by the tetracycline technique in hypophysectomized rats after administration of growth hormone and thyroxine during age 75–95 d. Hypophysectomy was performed at age 60 d. Administration of thyroxine resulted in a considerable increase in dentin apposition and longitudinal growth of the tooth. The same effect, but somewhat lower, was registered for growth hormone. Growth hormone and thyroxine administered simultaneously had an additive synergistic effect. Compared with the effect of hypophysectomy and of hormone administration on longitudinal bone growth and cortical bone remodeling the effect on dentin production and longitudinal growth of the maxillary incisors in the same rats is less pronounced and shows a different pattern in reaction, indicating differences in sensitivity for different cell systems and difference in endocrine co

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01928.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –A Study on the predominant cultivable microorganisms inhabiting gingival crevices affected with a chronic gingivitis was carried out using the roll tube culture technique. Samples were obtained from nine individuals 25–42 years of age. Gram‐positive rods made up 26.1% of the isolates and included mainlyActinomyces naeslundii, Actinomyces israelii, andActinomyces viscosus. Streptococcus mitisandStreptococcus sanguistogether made up 26.8% of the cultivable organisms.Feptostreptococcusaveraged 3.0% of the organisms recovered. Gram‐negative anaerobic rods constituted 25.0% of the total isolates withFusobacterium nucleatum, Bacteroides melaninogenicusss.intermedius, Bacteroides ochraceus, otherBacteroidesspecies,Selenomonas sputigena, andCampylobacter sputorumas the most predominant isolates.Haemophilus parainfiuenzaeaveraged about 14% andVeillonellaspecies 4.3% of the cultivable microflora. The data presented indicate that the subgingival microflora of a chronic gingivitis differs from those of healthy periodontium and advanced adult and juvenile periodontitis. This might suggest that different infectious processes may be operative in various clinical entities of periodontal

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01929.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –Twenty‐one submandibular salivary calculi from 19 patients were examined with the light and electron microscope. Adjacent to the peripheral parts of the calculi metaplastic squamous epithelium or connective tissue was seen in close contact to the mineralized matrix. Disintegrated cellular substances from these tissue components were in some cases found to condense in a peripherally located zone of the salivary calculi. The morphology of the examined salivary calculi varied extensively not only within each calculus but also from one calculus to another. High and low incidence of crystals gave rise to the lamellated pattern. In some cases the crystals were so abundant as to give a dense homogeneous appearance. In the central parts of the calculi spheroid bodies of very low electron density with a size ranging from 1 to 100μm were found in an amorphous matrix. The origin of these structures is discussed. In the peripheral parts of some calculi os‐miophilic spherical bodies with an electron microscopical appearance similar to lipid granules as well as bacteria of cocci or coliform type were found. Degenerated bacteria might in some cases contribute in forming part of the peripheral organic

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01930.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –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‐μm‐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

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01931.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –Previous investigations have shown that corrosion and other electrochemical processes occur when different alloys or metals are found together in the same mouth. In the present report, when teeth were restored using non‐noble metallic posts, the metals diffused out to surrounding hard and soft connective tissues. The material consisted of extracted teeth with screwposts and surrounding discolored connective tissues. The screwposts had been cemented to the teeth 3–10 years earlier. The distribution of metal ions was determined by means of energy‐dispersive X‐ray microanalysis. Copper and zinc were found in both hard and soft tissues. Relatively high concentrations of copper ions were identified in areas of the teeth with blue‐green discolorations. Zinc ions were detected in the dentin; they most probably originated from the screwposts and the cement, but zinc is also found in normal human dendn. Copper, zinc, silver and iron were found in the dark discolorations of the gingiva adjacent to the extr

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01932.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

ABSTRACT –The levels of airborne particles emanating from handling alginate impression powders have been surveyed. The concentrations of powders, lead and silicious particles in the aerosol have been measured after thoroughly shaking the containers before opening. The decrease of the powder concentration in the ambient air as a function of time has been estimated. The efficiency of face masks to protect against powder exposure has been investigate

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb01933.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY