摘要:

SummaryUsing a representative sample of 5028 dentulous Finnish adults the occurrence of dental caries was studied among removable partial denture (RPD) wearers and non‐wearers. Of the subjects wearing no RPD(s) 61·4% had one or more carious teeth, among those wearing a single RPD the figure was 60·5% and among those wearing RPDs in both jaws 62·7%, respectively. When sociodemographic background, other oral status measures than caries and oral health care habits were simultaneously controlled, subjects wearing RPDs in both jaws had slightly increased (P≥0·05) probability of having one or more carious teeth compared to those with no RPD(s). Subjects with a single RPD did not have a statistically significantly increased probability of having carious teeth. Among those 3075 subjects who had one or more carious teeth the wearing of one or two RPDs did not significantly increase the number of carious teeth. Because the subjects wearing RPDs in both jaws were seen to have a slightly increased risk of having caries, this confirms the view that dentists should emphasize good oral hygiene habits and regular dental attendance among RPD

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00187.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryA controlled clinical study, containing 720 posterior amalgam restorations placed in a group of 103 adult patients by three dentists, was used for examination of the influences on the incidence of occlusal and approximal bulk fractures. These fractures were evaluated from black and white photographs, taken annually, of the occlusal surface of the restorations over a 5‐year period, using a three point photorating scale for both fracture sites.The influence of the dentist as well as the influence of the alloy and tooth type were statistically analysed. The results of these analyses demonstrated that the dentist, as well as the alloy and tooth type, have a statistically significant influence on the incidence of bulk fracture of amalgam restoration

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00188.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThirteen healthy adults performed sustained clenching at 50% maximum clenching level judged electromyographically. Electromyograms were recorded from both anterior temporal and masseter muscles during clenching and the silent period latency and duration were measured. As the result of muscle fatigue, the silent period latency significantly decreased, whilst the duration significantly increased up to 3 min from the beginning of clenching.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00189.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryA series of investigations have been performed to study some factors influencing the tensile bond strength of glass polyalkenoate cements to dentine. The measured bond strength was affected by the method of storage of the teeth prior to testing, the nature of the dentine and the type of cement used for the tests. The most consistent results for bond strength measurements were obtained with teeth stored in neutral buffered formalin for more than 1 month after extraction, and then stored in distilled water for 4 weeks prior to bond strength determinations. The mean value obtained with this storage regime (1·62 MPa) was not different from that obtained using freshly extracted teeth (1·74 MPa). The bond strength to deciduous dentine (0·72 MPa) was significantly less than that to permanent dentine (1·62 MPa). There were significant differences between the measured bond strengths of the three materials tested, with Ketac‐Fil giving the lowest result (1·62 MPa), then Ketac‐Silver (2·41 MPa), ChemFil II formed the strongest bonds (

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00190.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryA comparison between clinical, tomographical, and dental panoramic radiographical findings was made in thirty‐one female patients suffering from craniomandibular disorders (CMD). In general it was found that condylar sclerosis was more common in these patients than in earlier studies. After clinical separation of the material into two groups based upon the origin of pain, myogenous versus arthrogenous, no radiographical confirmation of the differential diagnostics could be made. Regarding vertical condylar asymmetry measured on the Orthopantomogram®, it was found that 74% of the patients with CMD had more than the 3% of asymmetry regarded as within normal limits. It seems that with an increasing severity of the disorder the level of condylar asymmetry appears less. If the interpretation of the findings is correct its conclusion might lead to the recognition of a morphological factor which could contribute to the development of a craniomandibular disord

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00191.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThe infrared spectra of seven commercially available posterior composite resins were analysed by ratioing the C = C aliphatic peak to the C = C aromatic peak. The degree of conversion ranged from 43–5 to 73–8%. The result was similar to the range previously obtained from unfilled Bis‐GMA based resins and commercial anterior compo

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00192.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThe single case experimental design was used to study day‐to‐day variations in the onset (PL), tolerance (PT), and intensity (VAS) of masseter muscle pain. Pain was induced by maximum voluntary teeth clenching, with no artificial feedback‐control of the level of isometric activity, and static work efforts were quantified by cumulative electromyography. A continual effort to produce maximum static work, about 40% increase from baseline work, elicited in 30–40s an initial sensation of muscular pain that had an intensity of about 25% of maximum possible score. A further increase in maximum static work effort, about 60% increase from baseline work, caused in about 2min an intolerable increase in the intensity of muscular pain, about 50% of maximum possible score. WhereasPLshowed day‐to‐day variation,PTand the ratioPL:PTdid not. Intensity (VAS) scores and maximum static work efforts showed no day‐to‐day variations. Onset (PL) and tolerance (PT) showed no linear associations with VAS scores, and VAS scores showed no linear associations with maximum static work efforts; if anything, the latter associations tended to resemble a cubic parabola. Two different central neural processes, not associated with maximum static work efforts in a simple linear manner, might have been instrumental in: (i) the establishment of criteria for onset and tolerance of pain, and (ii) the discrimination of variable levels of

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00193.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryDentine has been shown to possess affinity for a large number of varied compounds, many of which have been shown effective in clinical trials, for the treatment of dentine hypersensitivity. The mode of action of these compounds is unclear. The aim of this study was to investigate the uptake of metal ions, fluoride and formaldehyde in solution onto dentinein vitroand determine whether therapeutic effects could be mediated through occlusion of dentinal tubules. Etched dentine sections were exposed for 1 h to 1000 ppm solutions of fluoride and metal salts. Levels of fluoride and respective metals could be extracted and measured from the specimens. Saliva pretreatment had a variable but small effect on uptake of each ion, but post treatment washings reduced all levels of retained fluoride and metals. X‐ray micro‐analysis indicated surface or immediate subsurface deposits of metals. However, surface changes were only consistently produced by zinc and more particularly tin salts. Both zinc and tin salts produced covering or obturation of tubules. The surface effects of zinc could largely be reversed by washing, but not those of tin. Formaldehyde alone or in the presence of saliva produced no effects. A 4‐week study involving twice daily exposure of specimens to saliva and fluoride, metals or formaldehyde yielded essentially the same results. It is unlikely that, except for tin, the compounds tested achieve their apparent clinical effects mediated by direct occlusion of dentinal tu

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00194.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThe persistence of identification marks applied to dentures with two‐spirit solvent based fibre tip pens and graphite pencil covered with an experimental and a proprietary sealant were studied under service conditions. In general, the marks applied with the pens were rapidly lost, but those covered with the sealants persisted satisfactorily. The experimental sealant performed slightly better than the proprietary produc

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00195.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryMeasurements of the contact and embrasure areas of adjacent extracted teeth set in plaster blocks were made before groups of dentists undertook preparations on them. The prepared and adjacent teeth were examined and the findings related back to these measurements.Damage to the adjacent teeth was a common finding with both mesial–occlusal–distal (MOD) and complete crown preparations. There was some evidence that easier access to the contact area reduced the frequency of damage to teeth adjacent to MOD preparations. The taper of complete crown preparations did not conform to commonly recommended designs.This investigation highlights the need for greater consideration of approximal tooth surfaces when undertaking preparations and questions the practicality of achieving traditional features of complete crown preparation design. In teaching, greater emphasis should be placed on clinical reality rather than on theoretical, but unachievable ide

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00196.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY