摘要:

SummarySilicate cement and composite resin restorations have been evaluated clinically after 3 years of use. The composite resin restorations had retained their anatomical form and marginal adaptation better than the silicate cements but their colour matching qualities were inferior to that of the silicates.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01476.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummaryFifty young and fifty elderly subjects were tested by a two‐point discrimination method applying an aesthesiometer to the mucous membrane of lips, cheeks and tongue. Two changes characteristic of ageing were disclosed: (1) higher threshold values were found in the older age group concomitant with (2) a greater range of variation in these values. The importance of the perception of tactile stimuli from the structures tested is discussed in relation to adaptation to full dentures. It is suggested that signals arising from lips, cheeks and tongue assist the process of adaptation, whereas signals from the denture foundation can, on occasion, prevent adaptatio

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01477.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummaryDuring the last three decades the rapid development of synthetic polymers has been remarkable. Dentistry has not been slow to investigate the possible uses of polymers for a variety of purposes. This article reviews the properties and uses of polymers in dentistry and suggests areas where research may improve some materials.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01478.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummarySome aspects of the physiology of speech are discussed, particularly the correlation between the quality of speech and denture morphology.It is suggested that an objective method for the evaluation of speech is the use of spectrographic analysis with computer evaluation. The application of this approach to artificial denture wearers is demonstrated.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01479.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummaryThree‐dimensional photo‐elasticity was used to study the stress distribution in complete dentures in functional positions. A new loading device was developed utilizing a linear motion bearing as its main component and mandibular dentures were evaluated for the first time. The stress concentrations were highest (2.5 fringes) on the working side of the mandibular denture. This was also demonstrated in the maxillary denture; however, the magnitude was less (1.8 fringes). The results indicate that this method could be used to quantitatively evaluate the effect of various occlusal schemes upon the denture ba

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01480.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummaryThe distribution of copper dissolved in the silver‐tin phases of two types of dental amalgam alloy has been investigated. The results showed that the copper content of the γ phase was higher than the copper content of the β ph

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01481.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummaryThe adjustment visits of 259 patients, fitted with complete dentures for one or both jaws, at a denture clinic for the poorer social classes were studied. Only 44 % made one or several adjustment visits. The mean number of their visits was 1.28 and that of all the patients 0.56. The older age group contained a larger number of returning patients than the younger (P<0.05), and so did the group that had not been given written instructions (P<0.05). Healthy subjects visited the clinic earlier and also more often than the subjects in poor health (P<0.05). Sex, previous denture experience and the palatal compression used in taking impressions did not affect the return visits. The most frequent causes of the visits were pain produced by the dentures, and retention difficulties.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01482.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

SummaryConditioning of the enamel surface is an accepted procedure in several disciplines of dentistry to obtain increased bonding of dental materials to tooth surfaces. Three etching solutions commonly in use are 50% phosphoric acid, 50% phosphoric acid attenuated with 7% zinc oxide by weight and 50% citric acid. The effects of these solutions on the contact angle of an uncured epoxy resin on, and the bond strength of an epoxy resin formulation to polished enamel surfaces were investigated and compared with the results obtained on polished, unconditioned surfaces. In addition, the rates of etching of enamel surfaces by these acids were determined. The attenuated phosphoric acid produced the greatest reduction in contact angles and the most marked increase in bond strengths. 50% phosphoric acid etched the enamel surface to a greater extent than the other conditioning solutions.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01483.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Summary (Part 1 and 2)The authors have made a study of observer deviations in the re‐examination of patients with fixed bridges. The material consisted of eighteen patients who have had their bridges for about 2 years. The total number of bridge‐elements was 126, including eighty‐three abutment teeth and forty‐three politics.Nine observers have taken part. Of these, three have been teachers and six post‐clinical students, so that it has been possible to say that the observers had more, and lesser, experience of routine observation.The recorded factors have been: (1) primary contact; (2) the general status of the marginal periodontium; (3) calculus; (4) caries; (5) periapical status; (6) attrition facet; (7) abrasion in the opposing jaw; (8) crown margin excess; (9) crown margin deficit; (10) exposed crown margin; (11) pocket formation; (12) discolouration of gold.The examinations have been carried out in a conventional milieu with the usual instruments for examination and with access to orthopantomograms. The recordings have been made after independent as well as cumulative and simultaneous examination. In the last two cases the observers have been divided into three groups.A very simple account of the results regarding the first five factors is given. It is quite clear, however, that the nine observers record different totals and that positive finds are at the same time seldom reported by all.Each of the seven remaining factors has given rise to a larger number of (positive) recordings, so that a more detailed processing has been meaningful. Within each factor (with a certain exception for abrasion) considerable deviations are found between the nine independent observers in the matter of totals. It has been possible with analysis of variance to confirm, to a great extent, these deviations as significantly systematic. In connection with the change to cumulative and simultaneous observer strategy it has been possible to note certain improvements. It has not, however, been possible to designate the agreement between the three observer groups as appreciable. On the other hand, the number of positive recordings increases most frequently in connection with the changes to (Cum) and still more with the change to (Sim).The nine observers change level in relation to one another on moving from the one factor to the other. Within a certain factor they sometimes vary also between different patients, though a certain logical pattern appears. Through comparisons in pairs and the calculation of the correlation (expressed through the coefficientr) it has been possible to show that the correlation between the recordings of two observers is not always satisfactory. However, the conventional limit + 0.70 is exceeded in the majority of cases.The two groups of observers do not differ characteristically from each other factor by factor, (the factors ‘general status of the periodontium’ and ‘crown margin excess’ constitute exceptions). Both teachers and students change position in an irregular way. Each one of the nine observers may occur alternately as a high and a low recorder.The authors recommend further studies in this field with the aim of throwing light upon the homogenization of observers and becoming better informed concerning the precise significance of utilizing different ob

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1974.tb01484.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY