摘要:

SummaryThe relationship between microstructure and physical and electro‐chemical properties of copper‐containing dental amalgams has been discussed in an attempt to understand the role of copper in currently used dental amalg

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00397.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryIn a previous study it was found that the distance between the borders of the comfortable zone was considerably wider when the zone was recorded statically rather than dynamically. However, it was not reported how condylar displacements may be related to the zonal borders. Therefore, an attempt is made in the present study to translate zonal border recordings into the equivalent amount of condylar rotation. Using a dental articulator, it was found that the condyles rotated 4.96°, when the comfortable zone was recorded statically, and 2.50°, when the zone was recorded dynamically. The difference, 2.46°, was statistically significant (P<0.00

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00398.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryWhen a patient wishes to be treated for dentures, a careful examination and anamnesis have to be made. In the course of the anamnesis a detailed medical and dental history has to be taken, to diagnose any systemic disease the patient might suffer from, such as metabolic, hormonal, autoimmune, neurological, mental or emotional disorders. It is necessary to assess their possible effects and relationship to complaints about previous dentures. The dentures may of course be the main offending factor or contribute to the patient's oral problems, but only when this is confirmed beyond doubt should the dentures be replaced without referring the patient for supportive treatment. In cases of transition from natural or partly natural dentition to complete dentures, these disorders must be given careful attention, since in this critical situation any present systemic instability may trigger clinical symptoms that thus far were sub‐clinical and unfelt by the patient.No improvement in patients ability to use his dentures properly can be expected unless the primary causative systemic factors have been relieved by specific therapy.It is noteworthy that the majority of problem cases are women in the postmenopausal period, because of their special susceptibility to disturbances of the systemic homeostatic equilibriu

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00399.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryTwenty‐five Class V Composite‐resin, Adaptic® fillings were prepared on extracted human teeth under five different matrices. White stones and flame diamonds were used as polishing devices. The smoothest surface was obtained with celluloid strip and the most acceptable contour obtained with preformed ma

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00400.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryTrauma from occlusion was induced by inserting cantilever bridges bilaterally in the mandibles of two monkeys. In one monkey the mandibular nerve was cut on one side; in the other on both sides. By this procedure possible protective action of nerve receptors in the periodontal membrane was reduced. The occlusal trauma resulted in severe damage to the pulp and resorption of the roots, but no appreciable downgrowth of the crevicular epithelium.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00401.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryA comparison of the accuracy of denture bases made from a conventional acrylic and four modified acrylic resins was made with the use of a non‐parametric method. Twenty‐five identical maxillary stone casts were made and five dentures for each resin were processed by conventional compression moulding techniques. The fit of each denture at the molar‐to‐molar region on its cast was evaluated by five evaluators who independently ranked the twenty‐five dentures from best to worst fit after processing, after polishing, and after storage in water at 37°C for 42 days. The ranking data were analysed by Kendall's coefficient of concordance, the Kruskal‐Wallis statistic, and the Mann‐Whitney test. Excellent agreement among observers was obtained. After storage in water, two modified acrylic resins, Hydrocryl and Vitalon II, had a better fit on their casts than the conventional acrylic, Lucitone Hypro. Lucitone 199 had the same and Hircoe had a poorer fit than

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00402.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryOral function was evaluated in complete denture wearers by using a questionnaire, clinical examination and bite force measurements. Ten patients with satisfactory and ten with unsatisfactory dentures were studied and six of the latter patients were reexamined 1 year after the insertion of new dentures. The bite force values were compared with those obtained in ten dentate controls.No significant differences in bite force were found between the satisfactory and unsatisfactory denture groups. Individual values varied much in both groups. The six patients re‐examined were satisfied with their new dentures and thought they had improved chewing but no significant increase of bite force was found. The maximal bite force was 5–6 times greater in the dentate subjects than in the denture wearers. Edentulous persons are very handicapped in masticatory function and even clinically satisfactory complete dentures are poor substitutes for natural te

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00403.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryA method of normalizing the integrated EMG recordings from the masseter muscles is introduced. For each subject investigated the maximal clenching force is remarkably constant and reproducible. This makes it possible to normalize the integrated EMG recordings to the EMG activity at the maximal clenching force without having to measure this force at the beginning of every experiment. These normalized integrated EMG activities give a good quantitative impression of the static force exerted by the masseter muscle, and therefore can be compared quantitatively over several experiments. The relationship between the normalized integrated EMG activities and the clenching force is linear up to approximately 80% of the maximal clenching force.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00404.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryThe cytotoxic effect of the silicate cement ‘Silicap’ was evaluated in anin vitrosystem which simulates the clinical usage of the material. BHK‐21 (C‐13) cells on cover slips were exposed to the freshly mixed material for 1h, and stained for the demonstration of succinic dehydrogenase and acid phosphatase. The mean stain density for succinic dehydrogenase and acid phosphatase in the experimental cells was 77% and 153% of the control values respectively. The mechanism of cytotoxicity of ‘Silicap’ i

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00405.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SummaryThree high Cu‐γ2free amalgams and one conventional amalgam were used in a clinical study to evaluate degree of marginal integrity and surface discoloration occurring for time periods of up to two years. Two hundred and seventy restorations were placed in Class I and II cavities in sixty‐two paedodontic patients. Amalgams were prepared from conventional alloy, Cu admixed, Dispersalloy and three parts 50Ag‐20 Sn‐30Cu mixed with one part conventional alloy. Restorations were evaluated by three groups of clinicians. Ridit means obtained from all three groups of evaluations were in good agreement. The lower ridits indicate better marginal integrity and less tarnish. Marginal integrity of amalgams prepared from Cu‐admix did not differ appreciably (0.41) from the ridit associated with initial placement (0.39). Conventional amalgams had the highest ridit (0.65) for marginal integrity whereas the ternary/conventional and Dispersalloy restorations were intermediate (0.55 and 0.52). The ridit for tarnish and surface discoloration was decidedly higher for the Cu‐admix (0.73) than for the other systems investigated which had ridits of the order of 0.50 compared to an initial ridit for tar

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1979.tb00406.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY