ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00648.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—The ultrastructure of the subgingival deposits on the root surfaces of teeth affected by juvenile periodontitis was studied on 12 teeth from nine individuals, 15–30 years of age. The deposits consisted of either microbial masses associated with a pellicle, or of a cuticular material almost free of bacteria. Gram‐negative rods and filaments were the predominant microorganisms. “Corncob” configurations consisting of filamentous bacteria surrounded by Gram‐positive cocci, and “bristle brush” formations comprising corncobs surrounded by long rods were observed in the superficial layer of the plaque. Spirochetes and flagellated rods constituted a major segment of the microflora. The present data indicate that the deep pockets in juvenile periodontitis harbor a sparse but relatively characteristic micro

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00649.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—S.mutans, S. salivarius, S. mitisandS. sanguisstrains were isolated from three subjects of blood groups A, B and O. Parotid saliva samples obtained from the same subjects induced aggregation of some of the bacteria, theS. sanguisand theS. mutansstrains in particular. While parotid saliva from the three subjects gave almost identical reactions, slight interindividual differences were observed for a few strains with the submandibular sublingual salivas. In parotid saliva, secretory antibodies reacting with all strains were present. The antibody levels differed between the three subjects but no specific pattern was observed when homologous strains were compared with heterologous strain

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00650.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—Eight days old offspring of six rats treated with single doses of 40 mg/kg and 50 mg/kg of cyclophosphamide on the 20th day of pregnancy constituted two experimental groups. Group 1 (40 mg/kg) comprised 21 animals, Group 2 (50 mg/kg) 14 animals. Histomorphologic investigations of the maxillary and mandibular incisors revealed the following changes: (1) dental constrictions, (2) niche‐like dentinal defects, (3) scalloping of the amelodentinal junction, (4) incremental line in the pre‐experimental tooth segment, (5) external resorptions, and (6) diffuse edema in the pre‐experimental part of pulp. Constrictions and niches qualitatively concurred with those previously observed in adult rats of the same strain, but the lesion frequency was essentially higher in the offspring. Further, the additional change of external resorptions was evinced by the offspring incisors, and changes only rarely observed in adults, such as scalloping of the dentinoenamel junction and a dentinal incremental line, constituted frequent findings in the offspring m

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00651.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—Streptococcus mutanshas been shown to produce extracellular invertase, dextransucrase, and levansucrase. The purpose of this work was to study the relative quantities of these enzymes in pure culture supernatant, and in samples from commonly used purification methods. The strain “Ingbritt” was selected because it is a well‐defined human strain, available, and with well‐known growth requirements. The samples were incubated with sucrose for the determination of free monohexoses, and the polysaccharide from ethanol precipitation was hydrolyzed as previously described. In cell supernatant the inversion effect exerted 75% of total sucrolytic power, the dextransucrase 20% and the levansucrase 596. No method, tested in this work, could separate all the activities c

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00652.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—Two human sera with antibodies against smooth muscle were used to investigate the distribution of actin in moving oral epithelial cells by immunocytochemical methods. Epithelial outgrowths from explants of rat and human oral mucosa showed a constant positive staining in the peripheral parts of the marginal cells but not in the more central parts of the epithelial sheet. This is in agreement with theories of the importance of the marginal cells in the migratory behavior of the epithelial outgrowth. Subcultured epithelial cells from the human explants showed positive staining of fine fibers in the cytoplasm. During healing of experimental oral wounds from humans and monkeys actin fibers could be demonstrated in only one of 18 cases in the epithelial cells adjacent to the wound, though positive staining of various cells was seen in the underlying tissue. This is in contrast to the evidence presented in previous studies of cells taking part in the re‐epithelialization proc

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00653.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—Histomorphometric analysis of mandibular specimens has been performed in order to demonstrate possible sex and age differences in percent bone mass and bone activity in the mandible. The material consisted of 32 autopsy specimens from the right premolar region of the mandibular body in subjects with sudden unexpected death and without known bone disease. The subjects were divided in a young group (20–43 years of age) and an old group (60–90 years of age); each group consisted of eight females and eight males. Microradiograms of buccolingual ground sections of 100 μm were used. Quantitation of (1) percent bone area of cortical and trabecular bone and (2) total bone surface/bone area and resorption surfaces/total bone surface in trabecular bone, were done by electronic point‐counting. The analysis did not reveal any significant sex or age differences in the trabecular bone with respect to percent bone mass, trabecular coarseness and bone activity. In the buccal and lingual cortices a significant age difference was demonstrated, but there was no sex difference in percent bone mass. Cortical porosity in mandibles clearly increases with increasing age, but seems to be independen

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00654.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—Kinesthetic experience accompanying vibration of human jaw muscles was investigated in 12 healthy subjects. Vibration of the masseter muscle with the jaw in a 20mm opened position caused the subjects either to underestimate jaw closing effects or to experience jaw opening movements depending on whether the mandible was free to move or kept in a constant position. During vibration of the depressor muscles with the mandible in its rest position the subjects underestimated an opening movement, but fixation of the mandible caused no illusions of movement. All kinesthetic illusions perceived during vibration corresponded to elongation of the muscles under study beyond their actual length. Distortion of kinesthesia was independent of the amplitude and frequency of vibration and it persisted during anesthesia of the temporomandibular joints and loading of the mandible. It can be concluded that jaw muscle receptors may contribute to mandibular kinesthesi

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00655.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—The purpose of this study was to evaluate the microleakage around preventive composite fillings used in occlusal fissures with incipient caries, and to assess the influence of the consistency of the composite resin upon the leakage. The fissure enamel of 30 extracted maxillary premolars were partially removed using a small round bur (Ash® No. 1/2). Dentin was not exposed. The cavities were etched with phosphoric acid and filled with undiluted composite (Adaptic®) or composite diluted with different amounts of liquid resin (Adaptic Bonding Agent®). Five teeth were not etched before filling, and served as a control group. The teeth were cycled thermally between two dye solutions and the marginal penetration of dye was evaluated by examining sections of the crowns in a dissection microscope. Marginal leakage occurred in all the control teeth and in none of the acid‐etched teeth. It may be concluded that the preventive composite filling therapy provides good sealing of pits and fissures with incipient caries, and that the consistency of the composite used is not of primary impo

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00656.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

abstract—In 51 human fetuses from the first half of the prenatal period, developmental stages in the symphysis menti and the mandibular condyle were assessed by histochemical reactions. The study showed the association between the timing of the developmental stages in the two mandibular growth zone

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1978.tb00657.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY