摘要:

abstract–A material of 207 permanent teeth (including 90 cases collected from the literature), traumatized during’development by injuries to primary teeth, has been analyzed in a clinical, radiographic, histologic, microradiographic, and electron microscopic study. It appears from this examination that such developmental disturbances may be classified into distinct clinico‐pathologic entities, i.e. — (1) white or yellow‐brown discoloration of enamel, (2) white or yellow‐brown discoloration of enamel and horizontal enamel hypoplasia, (3) crown dilaceration, (4) odontome‐like malformation, (5) root duplication, (6) vestibular root angulation, (7) lateral root angulation or dilaceration, (8) partial or complete arrest of root formation, (9) sequestration of entire tooth germ, and (10) ectopic, premature, or delayed eruption

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02013.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The present study is a clinical and radiographic follow‐up investigation of 103 patients with 213 traumatized primary teeth. The re‐examination comprised a clinical and radiographic evaluation of involved permanent teeth after complete eruption. All disturbances in mineralization and morphology of these teeth were recorded. A multivariate analysis was applied to examine the relationship between clinical factors associated with the injury in the primary dentition and later disturbances among permanent successors. Disturbances in the permanent dentition were found in 88 teeth (41 %), and these complications were significantly related to age of the patient at time of injury, the type of injury sustained in the primary dentition, as well as the presence of an associated fracture of the alveolar

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02014.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The influence of various technical procedures on the morphologic details of human premolar root surfaces was investigated. Sixteen formaldehyde‐fixed specimens, in some cases post‐fixed with OsO4, were air‐dried at room temperature or freeze‐dried. Four of eight air‐dried specimens were fixed in formaldehyde only; another four were also post‐fixed with OsO4. Four freeze‐dried specimens were dried from distilled water and four from amylacetate. There was no noticeable difference between the specimens with regard to the gross and fine structure of fibrous collagen tissue. The interfibrillar substance was influenced in all cases. Fiber bundles subjected to post‐fixation in OsO4were particularly denuded of interfibrillar substance. Erythrocytes, also studied for comparison, revealed in all groups a general reduction in size and a certain variability in shape, indicating that they are subject to reversible alterations during the treatment procedures. The drying methods investigated were all acceptable for studies of fibrous, collagenous elements, although the size and morphology of some of the erythrocytes were generally influenced

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02015.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–A method has been developed for quantitating, on the basis of histologic serial sections, the contact area between the epithelium and connective tissue of oral mucosa. Magnified (200 ×) paper replicas are produced from histologic sections (20 microns) and two consecutive paper replicas are superimposed on an illuminated grid. By means of the grid lines the area between the two basement membranes is divided into trapezoids (T1) which represent the projection of imaginary trapezoids (T2) connecting the basement membranes of two adjacent sections. The area of these T2‐trapezoids may be calculated and is considered as representative for the epithelium‐connective tissue interface. Depending on the appearance of the T1‐trapezoids, a certain amount of discrepancy occurs between the calculated and actual area of the T2‐trapezoids. The significance of this is examined in thirty gingival specimens. It is concluded that without producing accurate values, the method offers the possibility to study quantitative differences in the epithelium‐connective tiss

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02016.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The morphology of the epithelium‐connective tissue interface was studied in gingival biopsy specimens of 29 male and 16 female Caucasians. Ten were 7–13 years of age, twenty 20–25, and fifteen 65–77 years of age. Separate three‐dimensional wax models (200 ×) were produced of the epithelium and connective tissue of the oral aspect of the free and attached gingiva. The average height, width, and number of connective tissue papillae or ridges and the average width of epithelial ridges were assessed for each specimen. In ten specimens of each age group measurements were made of the contact area between the epithelium and connective tissue. The length of the basement membrane and the volume of the epithelium was assessed within the same area. The essential age change of the epithelium‐connective tissue interface is the conversion of the connective tissue ridges to papillae. The contact area between the epithelium and connective tissue increases from the prepuberty to 20–25 years of age. The volume of the epithelium does not change with age. Sex‐related variations cou

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02017.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–A modified Millipore® technique for the study of oral leukocytes is presented. This technique permits rapid fixation with a minimum of injury to the cells. The clinical usefulness of the method was tested in a study of leukocytes in stimulated and whole salivas. The degenerative stages of PMN (polymorphonuclear) leukocytes were classified and estimated in a small group of healthy students. The results indicated that the method is suitable for this kind of study. In the Millipore preparations different leukocytes could be distinguished. The method is very simple and the samples can be handled routinely in cytologic laboratori

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02018.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The purpose of this investigation was to elucidate the repair processes in the root canal after total removal of the pulp. In 47 teeth, 35 with vital pulp and 12 with necrotic pulp, the root canal was cleaned and reamed, whereupon a bleeding was induced and the canal partly filled. In some teeth there was no bleeding, and these comprised the control material, which was necessary in deciding whether a blood clot in the root canal was a condition for repair or would at least enhance the repair processes. The observation periods varied from 9 days to 3 years; at the end of the period, the tooth was extracted or the root resected with the apical periodontium. Histologic examination of the specimens revealed that in the teeth with vital pulp, fibrous connective tissue had formed in the root canal in 28 teeth. Concomitantly a deposition of cellular cementum had occurred in many cases. In the teeth with necrotic pulp, no repair occurred. The clinical implications of the experimental investigations are discusse

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02019.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The influence of different base materials on the alkaline effect of calcium hydroxide as well as the alkaline effect of calcium hydroxide‐containing materials (Dycal® and Hydra®) was measured in an in citro system meant to imitate a cavity with a pulp exposure. The base materials did not appear to have any appreciable influence on the alkaline effect of calcium hydroxide as tested in this study. Like pure calcium hydroxide, Dycal and Hydrex seemed to have a lasting alkaline effect, i. e. the same effect before and after hardening of the materials. The alkaline effect of these materials, however, was lower than that of pure calcium hydr

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02020.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The ability of chlorhexidine to form colored reaction products with various aldehydes and ketones and the capacity of these products to discolor human teethin vitrowere studied. A number of the substances examined are intermediates normally occurring in oral microbial metabolism. Many of the substances proved to react with chlorhexidine to produce colored products. Acetaldehyde, glyceraldehyde‐3‐phosphoric acid, glyceraldehyde, and α‐ketoglutaric acid were the most marked chromogens. Pure hydroxyapatite as well as extracted human teeth were discolored by the reactions. In this respect, acetaldehyde exhibited by far the greatest

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02021.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–An electron microscopic study of 9 biopsies of focal epithelial hyperplasia of the oral mucosa in South‐west Greenlanders showed the presence of intranuclear papova virus‐like particles with a diameter of 400–600 Å. The cells containing the particles showed clumping and margination of the chromatin, disintegration of the nuclear membrane, and condensation of tonof

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb02022.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY