摘要:

abstract–Bacteria beneath 58 class V Concise® restorations on permanent molarsin vivowere registered. After an observation period of 1–4 months bacteria were found in all 13 cavities filled with Concise only, in 14 out of 15 cavities filled with resin and Concise, in 12 out of 15 acid‐etched cavities with Concise only and in 8 out of 15 acid‐etched cavities filled with resin and Concise. Only the difference between the two procedures: Concise only and acid + resin + Concise, was significant. The occurrence of bacteria in the dentinal tubules beneath the cavities was greatest when die cavities had bee

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01508.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–The ability of six different intermediary base materials to prevent bacterial entrance beneath silicate cement fillings was investigatedin vivoin primary molars. After an observation period of 1 month, bacteria were found on the pulpal wall in two out of 10 cavities beneath Fluoritec® and four out of 10 cavities beneath Durelon® solid mixed, De Trey® phosphate cement solid or creamy mixed. Beneath the intermediary base materials Dycal®, zinc oxide‐eugenol cement, Dropsin® and Durelon® creamy mixed, no bacteria were found. In cavities filled with silicate cement or silver amalgam only, bacteria were observed in nine out of 10 and in five out of 10 cavities, res

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01509.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–Intact enamel surfaces were exposed to 20 ml of 0.1% HCl for various periods. When the acid was unsaturated with respect to both hydroxyapatite and fluorapatite the surface enamel was etched away. With time the liquid close to the enamel became supersaturated with respect to fluorapatite but remained unsaturated with respect to hydroxyapatite. Under this condition subsurface lesions developed. These observations are discussed with reference to the use of diffusion‐restricting agents in laboratory caries experime

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01510.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–Human dental enamel was exposed to a pH 4 buffer containing 150 parts /106fluoride. It was found that due to the arising degrees of saturation with respect to calcium fluoride and appetites, surface enamel dissolved coincident with a formation of calcium fluoride. The calcium fluoride redissolved while it kept the liquid saturated with respect to tiiis salt. During this second period, fluorapatite was formed while hydroxyapatite dissolved. Finally, all calcium Ouoride was dissolved and the unreacted fluoride was taken up in the apatidc lattice. The results are discussed with reference to the conditions of the oral cavity and enamel solubility experiment

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01511.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–The binding of some selected food dyes to hydroxyapatite with and without a coating of chlorhexidine was studied. The apatite had bound 0.6 μmol chlorhexidine per g dry weight. The bound chlorhexidine was in equilibrium with a free concentration of 115 μg/ml (128 μM). The dyes. investigated were brilliant blue (FD&C Blue No. 1), indigo carmine (FD&C Blue No. 2), tartrazine (FD&C Yellow No. 5), sunset yellow (FD&C Yellow No. 6), amaranth (FD&C Red No. 2), and riboflavin. Riboflavin did not bind to either chlorhexidine‐treated apatite or untreated apatite, whereas the other dyes showed a considerable affinity for chlorhexidine‐treated apatite as compared with untreated apatite. Because the dyes with binding ability possess two or three acidic groups, and because riboflavin has none, it was suggested that the binding of the dyes is mediated by an interaction between the anionic groups of the dye molecules and the cationic groups of the chlorhexidine molecules. The results are discussed and related to the formation of the brownish discolorations seen on the teeth of patients using chlorhexidine mouthrinses. A mechanism to explain the development of tooth stains is

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01512.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–Fifteen human molars were investigated using lipidhistochemical and microradiographic methods. A peripheral neurotic and totally decalcified part of the carious lesion revealed a markedly positive staining reaction for sphingomyelin, sulfatides, cholesterol‐ and/or triglyceride‐esters. The reaction was probably conditioned by the presence of debris and plaque within this area. Pulpally and immediately below the necrotic zone, an area of demineralization was found which on the microradiographs appeared as a radiolucent zone. The zone showed a mineral gradient with an increasing mineral content towards the pulp. In the zone of demineralization a positive reaction occurred for sphingomyelin decreasing in a pulpal direction with increasing mineral content. A weakly positive reaction for cholesterol‐ and/or triglyceride‐esters, was also delected bat only in the most pulpal part of the zone of demineralization; the intensity of the staining reaction was comparable to that found in normal dentin, In chose areas which were represented by a sclerotized, radiopaque zone, only a very weak reaction for sphingomyelin, cholesterol‐ and/or triglyceride‐esters could be observed of the same staining intensity as in normal dentin. The region between the lesion and the pulp showed the same staining intensity as

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01513.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–Adult female rats were subjected to severe calcium deprivation by Feeding them a calcium‐deficient diet containing oxalate (Group A). Furthermore, pregnant and lactating animals were subjected to the same diet (Group B). The mandibular teeth were collected for ash determination and for linear measurements. The ash content of the growing incisors was only slightly reduced in Group A, while the reduction in Group B was 27%. Linear measurements demonstrated that the outer dimensions of the incisors were not affected by the calcium‐depriving regimen in either group, while the inner dimensions (pulp cavity) were considerably increased in Group B due to reduced thickness of the dentin mantle. The daily dentin apposition in Group A did not deviate much from the control values, while in Group B it was severely reduced. The thickness of incisor enamel was unaffected by the calcium‐depriving regimen. The ash content of the molars was normal in Group A, but slightly reduced in

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01514.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–Purified milk lactoperoxidase and endogenous human salivary peroxidase were used to label the proteins of whole mouth saliva with [125I]iodide. The proteins were then analyzed by isoelectric focusing or they were subjected so one‐dimensional polyacrylamide gel electrophoresis at pH 8.4. The radioactivity of the resolved protein fractions was determined. There were three to four major and four to five minor areas of radioactivity which were carried together with more or less distinctive protein fractions. Amylase and albumin were shown to be the most effective in binding [125I]iodide. No significant differences were observed in the iodination patterns of salivary proteins iodinated in the presence of endogenous saliva peroxidase and those iodinated in the presence of added milk lactoperoxidase. Hydrogen peroxide was necessary for iodination to take place. The significance of iodoproteins and the role of salivary peroxidases in the nonthyroidal metabolism of iodine are discus

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01515.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY

摘要:

abstract–The effect of unilateral extraction of the first or second primary molar on space conditions, need for orthodontic treatment, and eruption stage of permanent canines and second molars has been studied longitudinally in two groups. In Group 1 the first primary molar had been extracted early in 13 cases in the maxilla and in 14 cases in the mandible. In Group 2 the corresponding figures for the second primary molar were 14 and 24 for the maxilla and mandible, respectively. The space on the extraction side in Group 1 was significantly less than on the control side at the age of 9 but not at the age of 13. In Group 2 there was significantly less space on the extraction side than on the control side at the two registration ages (10.5 and 12 years). Need for orthodontic treatment was low in Group 1 and high in Group 2. As for eruption stage of permanent canines and second molars, no significant differences were found between the extraction side and the control side in the two group

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1977.tb01516.x

出版商:Blackwell Publishing Ltd    

年代:1977

数据来源: WILEY