摘要:

Abstract –Root canals of 49 teeth with necrotic pulp tissue in five monkeys were infected with Streptococcus faecalis ss liquefaciens, Actinornyces bovis, Fusobacteriam nucleatum, Peptostreptococcus anaerobiuS; and Bacteroidcs oralis in various combinations. After 6 months the root canals and the periapical tissues were subjected to radiographic., foacteriologic, and histologic examinations. Signs of periapical inflammation were radiographically registered in 41 teeth, most frequently in teeth inoculated with a mixed flora. In 11 out of 16 teeth infected separately with Strep, faecalis ss iiquefaciens, apical periodontitis was observed. Sera from the monkeys prior to and after the experimental inoculation were analyzed by means of gel diffusion, hemagghitination (HA), and complement binding test for antibodies against different antigen preparations of the homologous bacterial strains used for the inoculation. Detectable antibodies were seen with antigens of B. oralis in all five monkeys. Agglutinating antibodies were demonstrated with lipopolysaccharide‐antigen of B. oralis in titers between 1:40 and 1:320. A marked reduction of the antibody level against lipopolysaccharide (LPS) antigen after mercaptoethanol treatment indicated that a main part of the antibodies registered was of IgM‐class. The study shows that certain antigens of bacterial origin from infected root canals, while affecting the periapical tissues, also stimulate the production of circulating antib

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00746.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –Two control diets widi different sucrose contents (44% and 22%) were given to weanling rats for 55 d. The test diets were supplemented with an F + Mg combination, 75 parts/ 106F as NaF + 50 parts/106Mg as MgO and 38 parts/106F + 25 parts/106Mg, respectively, i.e. using the same supplement/sucrose ratio in each test diet. The supplementation in each test diet caused the same percentage fissure caries reduction, but the absolute mean caries scores were higher in the high‐sucrose groups than in the respective low‐sucrose groups. Enamel solubility was reduced by the supplementation. Despite the high fluoride supplementation, no untoward effects were recorded in growth and in aortic, heart, and renal calcium contents. Bone mineral density was reduced in the low‐sucrose controls and slightly reduced in the high‐sucrose F+Mg supplemented rats, as compared with the high‐sucro

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00747.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –Cell material from three different dental plaque bacteria (Actinomyces viscosus., Streptococcus raitis, Actinobacillus actinomycetemcorriiitans) were studied for their capacity to induce leukocyte migration in the dental pulp of monkeys. Altogether five animals were used to provide 123 teeth for the study. The bacterial test materials were prepared from lyophilized sonicates of pure cultures of respective bacteria mixed with crystalline bovine serum albumin (BSA) 1:1 by weight. Immediately prior to use in the experiment saline was added to render the test material into a paste‐like consistency. Buccal Class V cavities were prepared in the monkey teeth leaving a thin remaining wall to the pulp. In these cavities, the test materials were enclosed for a period of 8 h. A set of control cavities received BSA alone. Placement of test and control materials were made before and after depleting the animals of serum complement by repeated injections of Cobra Venom Factor. Histologic examination of pulp tissue specimens showed that materials from two of the bacterial species (A. viscosus, Act. actinomycetemcomitans) consistently induced infiltrations of polymorphonuclear leukocytes in one to several cell layers underneath the test cavity. The material from S. irtitis seemed less potent and in 11 of 22 teeth no pulpal reaction was recorded. Inacrivation of complement with Cobra Venom Factor did not appear to affect the severity of the pulpal respon

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00748.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –Complicated fractures occur in 3.5% of acute traumatized incisors. A pulp exposure results in almost all cases in endodontic treatment. The present investigation evaluated the prognosis for the different types of endodontic treatments following complicated crown fractures. Only incisors with an observation period of more than 23 months are included; the material comprises 301 incisors. Pulp capping was successful in 90.5% of the cases. There was a clear tendency for a positive correlation between the stage of the root development and the success rate of trie endodontic treatment. In cases with pulpotomy ZnO/eugenol cement or calcium hydroxide was used as amputation material. The pulp reactions following the different treatments are discussed. If calcium hydroxide was used 90% was successful, while in cases with ZnO/eugenoi cement as. amputation material 8.9% developed necrosis of die pulp and 34.4% showed an undesirable reaction with formation of hard tissue barrier or obliteration. The healing frequency was 83.9% for teeth treated with pulpectomy but there was a clear correlation between the standard of the root filling and the success rate. For all three treatment groups there was a correlation between damage to the supportive tissue and treatment succes

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00749.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –100 individuals with ankylosing spondylitis (AS‐group) and a comparison group comprising 57 individuals (C‐group) were examined for clinical symptoms from the stomatognathic system and occlusion. It was concluded that the AS‐group differed significantly from the C‐group with respect to mandibular mobility, tenderness to palpation of the temporomandibular joint and relation between the retruded and intercuspal position of the mandible. Clinical symptoms in the stomatognathic system were correlated to subjective general joint symptoms intheAS‐group. Occlusal factors may also be of importance for the development of clinical symptoms in the stomatognathic system in

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00750.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –it is well known that oral administration oi N‐methylnitrosourea (NMU) induces carcinomas in the forestomach of experimental animals. As the rat forestomach is lined with an orthokeratinized squamous epithelium the purpose of the present study was to elucidate whether carcinogenesis in this localization following intragastric application of NMU was comparable to oral carcinogenesis in experimental animals and humans. Furthermore, the development of oral m u cos al lesions in the rats was studied. It is concluded that the morphologic changes seen during carcinogenesis in the forestomach do not seem to differ essentially from those seen during experimental and human oral carcinogenesis. Furthermore, the number of oral lesions found in the present study are higher than reported in other strains of rats following administration of

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00751.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –Different opinions exist about the nature of the material in eosinophilic bodies, or “keratin pools”, in the epithelium of the human oral mucosa. The material has been described as keratin‐like and as a filtrate from the blood vessels. In the rat forestornach eosinophilic bodies develop in the hyperplastic squamous epithelium following administration of a chemical carcinogen. In the present study this model is used for immunohistochemical studies of eosinophilic bodies. They are shown to contain flbrinogen and immunoglobulin and thus seem to develop as a result of pooling of plasma exudate in the epi

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00752.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –Sixteen patients with tension headaches were treated with acupuncture, needles being inserted in the hand and foot and then electrostimulated. All patients were seen at four 2‐h sessions with intervals of 1 week between each. The first two sessions were used for clinical examination only, thus serving as control, while acupuncture was administered during the last two sessions. Urine samples were collected immediately before and after each session and later analyzed for catecholamine content. During the 1‐week intervals between sessions, records were kept of headache attacks and medicine intake. Following acupuncture two‐thirds of the patients showed reduction in number of headache attacks, and about one half of the patients reduced their use of pain relieving drugs considerably. Urinary excretion of adrenaline and noradrenaline was always higher in samples collected before sessions than after sessions. However, this reduction in catecholamine excretion was significantly greater when acupuncture had been admin

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00753.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –115 persons were studied from a body of patients referred to the Faculty of Odontology, University of Umeå, for investigation regarding any occurrence of oral galvanism. Potential and polarization of metallic restorations and dentures were recorded using a method and equipment previously described. Data regarding distribution of potential ranges with respect to number of patients and type of alloy are presented. The distribution of calculated intraoral currents in relation to number and type of metallic contacts is stated. Relevant parameters for the study of oral galvanic (bimetallic) cells are discuss

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00754.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract –The compressive strength and erosion resistance of glass ionomer, silicate, zinc phosphate or zinc polycarboxylate cements, submitted to heat treatments at 50° or 70°C after mixing, have been assessed. Zinc phosphate cement specimens showed a marked reduction in compressive strength properties and erosion resistance, while minor improvements in compressive strength were observed for various brands of the other types of cements. For silicate cement a considerable improvement in erosion resistance was noted. One brand showed a reduction in the release of phosphate amounting to approximately a factor of 20. The various improvements observed may be clinically exploited by exposing the restoration after insertion to radiation from an external heat source which deposits radiation energy in the surface or bulk of the restorat

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1982.tb00755.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY