摘要:

SummaryBecause of contradictory reports between clinical and radiographic findings, occlusal analysis correlated to dental panoramic findings was completed in 147 patients treated with fixed prosthesis. Both occlusal interferences and radiographic changes in the TMJ area and/or in dentition were frequently discovered. Dysfunction and occlusal indices gave statistically significant correlations to radiographic changes (P<0.01 andP<0.05, respectively) in the TMJ area. Periodontal changes with vertical bone pocket formation and sclerotic lamina dura seem to be early radiographic findings and occlusal interferences were the only means to give a clear‐cut correlation to the radiographic changes (P<0.001). However, if periodontal tissues with supporting bone structure fail to respond to occlusal trauma, changes in the TMJ area will probably appear. From the clinical changes the deviation on mouth opening, tenderness to palpation of TMJ, and slide from retrusion to intercuspidation (RP–IP) explained most of the radiological TMJ changes when tested by the discriminant analysis. The value of radiographic follow‐up of subjects following prosthetic treatment is empha

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00736.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummarySeveral theories have been proposed concerning the aetiology of dysfunction of the temporomandibular joint (TMJ). To analyse the relationship of radiographic changes to clinical signs and symptoms of TMJ dysfunction, the present study was conducted in subjects highly predisposed to TMJ involvement, i.e. in patients with rheumatoid arthritis (RA). The aim of the study was to estimate the frequency of disturbances in the masticatory system of RA patients. In addition, the relationship between TMJ abnormalities and the signs and symptoms of dysfunction was investigated.The study consisted of sixty patients with RA and forty control subjects. Asymptomatic subjects were more frequent in the RA group than in the controls. Muscle pain during palpation was recorded in 53.3%, clicking in 53.3%, crepitation in 21.7%, reduced movement capacity of the TMJ in 41.7%, and restricted mouth opening in 31.7% of the RA patients examined. In the control group the most common symptoms and signs were clicking (57.5%), muscle pain during palpation (57.5%) and restricted opening (25.0%).Normal radiographic appearance of the TMJ in RA patients was found in 31.7%. Minor changes comprised 31.7%, moderate changes 21.6%, and severe changes or total loss of the condyle 15.0%. In the control group a normal joint was detected in 87.5%, while minor changes were encountered in 7.5%, and moderate or severe changes only in 5.0%. No relationship was found between Helkimo's anamnestic, clinical or occlusal indices and the severity of the disease graded according the criteria outlined by the American Rheumatism association (ARA). In the ARA group the frequency of signs and symptoms of dysfunction increased with the destructive changes in the TMJ area. In the controls, muscle pain during palpation and clicking sounds in the TMJ were most commonly connected with normal radiographic appearance of the TMJ. In the discriminant analysis the most discriminating factors were crepitation, tenderness to palpation of muscles and movement of TMJ.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00737.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryThe relationships of the lateral pterygoid muscle within the infratemporal fossa were observed by conventional dissections and by examination of specimens sectioned in the horizontal and frontal planes. The following less well‐known features were noted. At the origins of the superior and inferior heads there are regions in which the fibres are interlaced or closely overlapped by fibres of either the temporalis muscle or the medial pterygoid muscle. Fibres of the superior head insert not only into the meniscus of the temporomandibular joint, but also into the pterygoid fovea at the neck of the mandibular condyle. Specimens sectioned through the origin of the inferior head of the muscle show internal tendon lamellae consistent with a pennate structure.Electromyographic (EMG) activity was recorded in five healthy subjects using concentric needle and fine‐wire electrodes. Strong to very strong activity was consistently observed in the superior head during clenching and tooth gnashing. The inferior heads were silent or had negligible to slight activity most of the time during ipsilateral movements or clenching, but were co‐activated bilaterally, with strong to very strong activity during jaw opening, protrusion, swallowing, tooth gnashing and during passive retrusion. They showed marked activity unilaterally during contra‐lateral mo

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00738.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryStress‐induced muscle hyperactivity has been proposed as a major aetiological factor in the production of pain in the muscles of mastication and the temporomandibular joints. In the present study, a total of fifty‐two patients with joint or muscle pain were evaluated for stress with the Derogatis Stress Profile (DSP). The muscle pain group (n=24) had higher clinician ratings of psychological factors, stress and chronicity. The muscle‐pain group also had higher Environmental Stress scores on the DSP, more intense pain, and more activity impairment than the joint‐pain group (n=28). The results of multiple regression analysis suggest an association between pain, depression, and impairment of activity in the muscle‐pain group but not in the joint‐pain group. The overall results further suggest that muscle pain develops at ‘normal’ l

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00739.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryA new model of experimental restoration is suggested for testing the marginal imperfections of composite resin, for examining the surface morphology of composite restorations and of sound, etched and remineralized enamel. Enamel‐ dentine samples with standardized cavities and composite restorations were placed on lower removable partial dentures using the etching technique. After 12 and 28 days the specimens were examined in a scanning electron microscope (SEM), operated at 15 kV.After 12 days the examination of the conventional composite resin by SEM showed extremely rough structures. The use of the enamel etch techniques produces acceptable marginal conditions with tags and some minor gaps. Etching the enamel emphasizes its prismatic structure and reveals the typical pattern of demineralization, involving prism cores and the preferential dissolution of prism peripheries.After 12 days the SEM appearance of uncovered etched enamel suggested that incomplete remineralization had occurred. After 28 days the mineral recoating, which had progressed further, predominantly involved prism‐orientated repair. The experimental model described here is more accurate, highly standardizable and easily accessible, compared with conventional clinical and replica techniq

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00740.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryModification of an amalgam alloy may give rise to improved physical properties. The physical properties of a newly formulated, single‐composition lathe‐cut amalgam alloy were studied and found to be superior to those of a conventional lathe‐cut amalgam alloy. However, such modification in formulation may result in changes in the clinical handling properties of the material. The high‐copper amalgam alloy was assessed by a panel of general practitioners who found that the general handling properties of the material were similar to those of conventional lathe‐cut amalgam alloys.The longer term performance of the high‐copper alloy was assessed by means of a blind, controlled clinical trial carried out by two operators. A 1‐year assessment of the resulting restorations and tooth replicas could not distinguish between the high‐copper alloy and a conventional alloy. The two alloys had both given good c

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00741.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryAs an orthopantomogram provides bilateral information, it seems to be an efficient tool for screening for arthropathy of craniomandibular disorders. An experimental model was designed and constructed to resemble a human mandible. By changing the position of the model in the horizontal plane of the orthopantomograph, nine different images were analysed for changes of vertical magnifications. Emphasis was put on large parts of the mandible like the condyle. In positions that had been altered less than 10 mm from the originally centred position of the mandible in the orthopantomograph, vertical differences between the left and right sides were less than 6%. Observed condylar asymmetries within a 6% difference might, therefore, be due to technical failures.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00742.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryThe general and specific satisfaction of patients treated with a jawbone‐anchored bridge was compared with their pretreatment satisfaction with dentures (condition 1,n=31). Patients who asked for information on the osseointegration method but did not apply for treatment (condition 2,n=32), and a group of patients that did not ask for information (condition 3, n=10) were also questioned on their satisfaction with dentures. The results indicated that condition 1 subjects were both socially and physically substantially more satisfied with their bridge than with their earlier dentures. On all satisfaction measures condition 3 subjects indicated more satisfaction with dentures than either condition 1 or condition 2 subjects. There were no significant differences between the three groups on several personality characteristics (neuroticism, test‐taking attitudes, internal/external control). Condition 3 subjects were less extrovert (socially oriented) than the other subjects. Condition 1 subjects made several suggestions towards improvement of the pre‐ and post‐operation phase, concerning the amount of pain involved and the cleaning of the brid

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00743.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

SummaryA maxillary photoelastic model was constructed to determine the retention and force transmission characteristics of a bilateral distal extension base partial denture. Comparisons were made using palatal and labial I‐bars. It was shown that there were no significant differences in retention and force transmission between palatal and labial I‐bars. From a stress and retention standpoint, it may be concluded that the use of palatal I‐bars is a viable alternative to the labial I‐bars, especially where aesthetics is of primary

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00744.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1987.tb00745.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY