摘要:

SummaryIn shortened dental arches (SDA) the remaining premolars tend to migrate distally. This may lead to a decrease of the vertical dimension, resulting in an increased load on the anterior teeth. Consequently the number and intensity of the occlusal contacts between the front teeth increase. This may result in interdental spacing in the upper front region. In this study the pattern of migration of the teeth in subjects with SDA (n=60) is described. The SDA group is compared with subjects having complete dental arches (n=72). Although a systemic effect of SDA has been found on interdental spacing for subjects under 40 years of age, it is concluded that this migration is within acceptable levels.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00725.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryRecent evidence has been presented suggesting that ‘depression’ headaches and classic migraines may be related to extended sleep duration. This analogue study was designed to evaluate the possibility that mild to moderate headaches induced by excessive sleep might be related to increased muscle activity. Eight subjects who experienced headaches as a function of increasing sleep duration by 2 h were evaluated in headache (i.e., extended sleep) and a non‐headache (i.e., normal sleep) conditions. Sex‐ and sleep‐duration matched controls were evaluated under the same sleep conditions, although none experienced headaches. Frontalis electromyographic (EMG) data were evaluated in a 2 × 2 analysis of variance. The results indicated no EMG differences between groups or across sleep conditions, even though all experimental subjects experienced headaches on the extended sleep night. Discussion focuses on the implication of these results for future headach

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00726.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryFour designs of amalgam‐core anchorage were compared in a laboratory study for the inability to withstand the horizontal component of occlusal force. Amalgam cores were constructed for extracted teeth with either composite resin‐cemented Dentatus dowels, or with Para‐post or Flexi‐post dowels cemented with phosphate cement. All the posts were of comparable length and diameter. These anchorage designs were compared with each other and to a self‐threading (TMS) pin‐retained amalgam core, by application of horizontal force and recording forces causing failure. Flexi‐post‐retained amalgam cores failed at a mean force of 36·5 (±8·5) kg while Dentatus‐retained and Para‐post‐retained cores failed at 41·7 (±8·0) kg and 46·6 (±11·4) kg, respectively. TMS‐retained cores resisted forces up to a mean force of 53·5 (±4·5) kg. Patterns of failure varied widely among these groups. Composite resin‐cemented Dentatus dowels were retained in the tooth in nine out of ten samples, while none of the ten Flexi‐post dowels and only one of the ten Para‐post dowels did so. Tooth fracture on, failure occurred in seven out of ten Flexi‐post‐retained cores, while only three out of ten of the Para‐post‐retained cores and none of the Dentatus dowel‐retained cores presented this unrepairable type of failure. P

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00727.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryElectromyographic silent periods in response to chin taps during clench were recorded from the anterior temporalis and masseter muscles. Ten complete denture wearers were observed up to the 1‐year stage of denture wear and eight patients up to the 2‐year stage. Silent periods were also recorded from patients clenching on paper rolls in place of the dentures.Regarding the patterns of the silent periods, similar observations of double silent periods were made as in our previous study up to the half‐year stage of denture wear (McCall, Tallgren&Ash, 1979). The frequency of the double silent periods was 13.8% at the 1‐year stage and 7.3% at the 2‐year stage.The mean duration of the silent periods did not differ significantly at the 1‐year and 2‐year stages. The mean silent period duration when clenching on paper rolls without dentures in the mouth was significantly shorter than when clenching with

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00728.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryThe periodontal conditions of subjects with different combinations of removable dentures were studied in a representative sample of 8000 subjects, of which 90% were used for the experiment. The number of subjects with removable dentures was 1468. Subjects with removable partial dentures had significantly more pockets and deeper pockets than did those without dentures. The periodontal condition of subjects with a complete denture in the opposite jaw was significantly better than that in other subjects. This was true in both men and women. The results indicated the importance of prophylactic and maintenance care in subjects with removable partial dentures.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00729.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryOral behavioural patterns have received limited empirical support for their causal role in the development of head and facial pain. The present study was designed to assess electromyographic (EMG) variations in six muscle groups (i.e., bilateral masseter, temporalis and orbicularis oris) as a function of various oral behavioural patterns. A second purpose was to determine whether mandibular movement patterns and specific oral behaviours could be predicted by EMG patterns. Eleven non‐pain subjects followed each of twenty oral behavioural patterns while EMG was recorded. Electromyographic change scores were computed for each behaviour relative to baseline measures. Initial analyses were performed using factorial repeated measures ANOVAS. Usingpost hocanalyses as general guides, specific EMG criteria were developed for classifying mandibular movements. For most subjects, EMG patterns accurately classified teeth clenching, protrusive/retrusive movements, right movements, left movements and lip movement patterns. Wide individual variations were found among muscle groups for identical behaviours. The association between particular oral behaviours and EMG patterns may explain ‘sinus’ headaches and certain types of facial

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00730.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryThe aim of this study was to collect information about the mean working time needed to accomplish the clinical procedures in applying an adhesive bridge, and to gain an insight into the factors that influence the working time. The study was carried out as part of a clinical trial. One hundred and fifty‐one patients needing one adhesive bridge were selected for this study and divided between five operators. Clinical procedures were carried out following a written protocol. The statistical method consisted of an ANOVA after log‐transformation of the working times. The total mean working time needed to accomplish the clinical procedures for adhesive bridges was 60·7 min (s.d.±16·5 min). The mean working time increased by 30% where the abutment teeth were restored with class II or class III restorations. No influence was found related to: (1) type of bridge (i.e. macromechanical versus micromechanical), (2) type of luting resin and (3) location of the bridge. A significant effect on the working times was found for: (1) operator, (2) tooth preparation and (3) occlusal adjustments. With increasing experience of the operator the median working time decreased by up to 35%. The data from this study are considered as useful basic information for efficient planning in the dental practice and for a further cost‐benefit

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00731.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryThe ability of ten edentulous patients and one patient with a full upper removable denture and a full arch (16–26) lower fixed denture to adapt to sudden change of the interocclusal distance was tested. An upper acrylic bite splint was inserted which, on average, increased the vertical dimension of the face by approximately twice the mean interocclusal distance during relaxation. After this procedure all patients quickly acquired an unstrained new postural position of the mandible. Directly after insertion, when instructed to relax, all patients hit the lower surface of the splint. They seemed, however, to need only one such experience to adapt to the increased interocclusal distance. The second time they repeated the procedure none of them touched the splint. Instead a new postural position was established with a mean interocclusal distance of 3.3 mm.This fast re‐programming of jaw muscle tonus and length is assumed to be a response to different peripheral receptor discharge converging to the cerebellum and other programming centres. The present study on edentulous patients shows that afferent discharge from periodontal receptors is not a necessary prerequisite. It also confirms that the old concept of consistency of the mandibular postural position (Thompson, 1946) is errone

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00732.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryA new technique is presented for recording and evaluating the dysfunctional TMJ sounds on an objective basis. The physical implications related to TMJ phonoarthrometry (PAM) are discussed and three cases are presented. The phonoarthrography and the digital phonoarthrometry presented in this paper can be a useful harmless diagnostic tool. Differential diagnosis of TMJ pathology is possible on the basis of an acoustical analysis and it is hoped that future investigation will confirm these observations.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00733.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryThe aim of this study was to analyse the clinical dental health, use of dental services and socio‐economic factors correlating with the subjective need for removable dentures in Finnish adults aged 30 years and older. A total of 2528 persons who had lost one or more natural teeth (wisdom teeth excluded) and who had not been provided with any dentures, were selected for this study. Subjects who had subjective need for prosthetic treatment had statistically significantly fewer teeth and fewer fillings, and more decayed teeth than others. Irregular users of dental services felt the need for a prosthesis more often than did regular users of those services. Irregular brushing of teeth was also associated with a greater need for prosthetic treatment. Men, older individuals and persons with less education and a smaller family income felt the need for prosthetic treatment more often than women, younger individuals and better educated persons.The factors differentiating between the two groups with and without a subjective prosthetic treatment need were analysed by discriminant analysis. The best differentiating factors were frequency of dental visits, caries score, frequency of brushing teeth, family income, number of fillings and se

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00734.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY