摘要:

abstract–Numerical variations and fusions in the primary dentition were studied among 4,564 children from 3 to 31/2 years of age. The results of the examination showed that aplasia occurs in 0.5%, hyperodontia in 0.5%, and fusions in 0.9%. Patients with aplasia in the primary dentition nearly always showed aplasia of the successors. In patients with unilateral aplasia in the primary dentition, aplasia of the contralateral permanent tooth was often found also. Most cases of hyperodontia occurred in the maxilla. Half the supernumerary teeth were maxillary lateral incisors, and they were often followed by hyperodontia in the permanent dentition, whereas cases with supernumerary central incisors were less often followed by hyperodontia in the permanent dentition. Where a mandibular lateral incisor and canine were fused, aplasia of the permanent lateral incisor was always found, whilst cases with fused incisors only rarely involved changes in the permanent dentition. Cases with gemination in the primary dentition were as a rule followed by normal conditions in the permanent dentitio

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01986.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The presence of adrenergic axons and nerve terminals has been demonstrated in the rat incisor pulp by means of the histochemical fluorescence method of Hillarp&Falck. Adrenergic, nerve terminals in close connection with blood vessel walls were observed at all levels in this tissue, although there was an excess in the apical region. Administration of a MAO‐inhibitor and noradrenaline increased the fluorescence intensity markedly, while reserpine and sympathectomy could abolish the fluorescence. The findings suggest the presence of an adrenergic regulation of blood flow in the rat incisor pulp and consequently an indirect nervous influence on the dentinogenesis. The possible relation between a suggested circadian rhythm in the activity of peripheral adrenergic neurons and the incremental pattern of the dentin is discus

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01987.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–Vital pulpotomy was carried out on 28 primary molars of IT) children between the ages of 3 and 6 years. As dressing material zink oxide‐eugenol cement was used in 14 teeth and Ledermix® cement in 14 teeth. Contralateral teeth were treated in 13 of the children. The observation period varied from 1 to 42 months. None of the treated teeth were painful during the period of observation. Internal resorption, evaluated radiographic‐ally, occurred in six teeth treated with zinc oxide‐eugenol cement, and in three teeth treated with Ledermix cement. No other complications were observed. Evaluated clinically and radiographically, the treatment was thus successful in 57% of the cases with zinc oxide‐eugenol cement and in 79% of the cases with Ledermix cement. Histologically, the occurrence of internal resorption was of almost the same frequency in the two groups, but the degree of resorption was considerably less in the group treated with Ledermix cement. The inflammation of the pulp tissue in the area of the amputation was clearly more severe in the group treated with zinc oxide‐eugenol cement than in the group treated with Ledermix cement. Accepting the importance of correct diagnosis, this histologic study indicates that Ledermix cement, as dressing material in vital pulpotomy of primary molars, is superior to zinc oxide‐

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01988.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The effect of calcium hydroxide as a potential bone inductor in ectopic locations was studied by implanting calcium hydroxide subcutaneously or intraperitoneally in rats. The calcium hydroxide was either left in direct contact with the host tissue or separated from it by Millipore® filters. The observation periods ranged from 6 to 18 weeks. The present investigation could not verify previous reports of calcium hydroxide as a bone inductor when placed in ectopic locations. However, in some of the cases where direct contact was established between host tissue and calcium hydroxide, marked hyperplasia of the connective tissue and numerous multinuclear giant cells were observed. Occasionally some ill‐defined basophilic, von Kossa positive islands were observed which slightly resembled immature bone. If direct contact between calcium hydroxide and the host tissue was prevented by Millipore filters, no significant reactions were observed in the host ti

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01989.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–All normal human sera examined have been shown to contain complement‐fixing antibody to an antigen present in stratum corneum of human skin. By immune adherence with human sera and sections of frozen biopsy specimens, the antigen was found to be present in sections of keratotic and parakeratotic areas of human gingiva, tongue, alveolar, buccal, and palatal mucosa. Serum from biopsy donors mediated the adherence reaction. Absorption with a phenol‐water extract (water phase) of stratum corneum of skin removed the antibodies. The antigen was not detected in non‐keratinized areas of human oral mucosa, including gingival crevice and cuff epithelium. Erythrocytes also adhered to keratinized epithelium in gingival biopsy specimens fixed in ethanol and cleared in xylene at 4° C prior to sectioning and incubation with hum

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01990.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–This paper reports on a study of wound healing in the gingiva of young and aged human beings. Healthy facial gingiva of young (mean age 23 years) and old (mean age 70years) persons were selected on the basis of the criteria of the Gingival Index and on gingival exudate measurements. The depth of the gingival crevices was measured and casts were produced for recording the level of the gingival margin. A 2 mm wide biopsy was performed to the bottom of the crevice according to a standardized technique. The progress of healing and regeneration of the crevice were studied clinically at 2, 4, 7, 10, 15, 20, 30, 40, 50, and 60 days. In the aged patients additional assessments were made at 70, 100, and 300 days. At the termination of the observation period new casts were produced. The results showed that from a qualitative point of view healing occurred somewhat earlier in young as compared with old individuals. However, the most conspicuous difference was that whereas the free gingiva of the young adults regenerated to pre‐operative levels within 60 days, that of old individuals never did regenerate completely. This lack of regenerative capacity of the aged individual is discussed with reference to general principles of wound heal

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01991.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The purpose of the present investigation was to study the effect of reducing the pleasure derived from sucking in 23 children practicing a prolonged thumbsucking habit. For this purpose a 0.5 mm thick removable cover (“splint”) was used, duplicating exact contour of teeth and palate. As a psychologic support the children were told that the sucking habit was just a pleasant occupation and that they were allowed to suck whenever they wished. Two control groups of 12 children were established, one having no splint but the same psychologic support, and one having neither splint nor psychologic support. Control after 6 months showed a significant decrease in sucking activity in the study group compared with the two control groups. Psychologic support without application of splint induced no decrease in sucking activity. The splint was worn willingly and cessation or reduction of the habit took place without any overt nervous reac

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01992.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–Seven methods for quantitative protein analysis were evaluated for the analysis of protein in saliva. The degree of interference from dialyzable components and from components retarded on Sephadex G‐50 was determined. Parotid saliva protein was fractionated into a glycoprotein‐rich and an amylase‐rich fraction on Sephadex G‐75, and the relative contributions from these protein fractions in the various protein tests were compared. Ultraviolet absorption at 215 mμ was recommended for the determination of total protein in saliva

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01993.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–The affinity of fluoride for hydroxylapatite powder with or without coatings of salivary proteins or salivary proteins and dextrans was investigated. Solution of sodium fluoride was added to uncoated and coated samples of hydroxylapatite. Fluoride ion concentration of supernatants above the coated and uncoated samples was measured and used to evaluate the effect of the coatings. The coatings seemed to affect the fluoride‐hydroxylapatite interaction only to a very small deg

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01994.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

abstract–An attempt to study the eruption of the guinea pig molars through the oral mucosa resulted in the observation that the guinea pig is born with a functioning and heavily attrited dentition. Extensive occlusal wear of the molar teeth was likewise found in guinea pig fetuses about ten days prior to birth. These findings indicate that clenching and grinding of the teeth may occur without repressed aggressions or emotional tension and that dietary abrasives are not necessary for the attrition of the occlusal tooth surfaces. The present observations thus support the view that occlusal wear is not only a mechanical loss of tooth substance but, in most animals, an indispensable biologic occurrence in the development and maintenance of a functional masticatory orga

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1971.tb01995.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY