ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00141.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThe techniques and sites for EMG recordings from the digastric muscles are controversial. To re‐evaluate old techniques for recording from the digastric muscles, especially the posterior bellies, the morphology of the muscles was studied by conventional dissections and by examination of specimens sectioned in the frontal and the horizontal planes. Based on these anatomical findings, recording sites and approaches to them were developed for the anterior and posterior bellies of the digastric muscles. EMG recordings from the two bellies of the muscle were obtained from five healthy subjects. The EMG recordings were ranked according to muscle activity level and the activity within single muscles and between muscles compared using the Wilcoxon signed rank test. The anterior and posterior bellies had synchronized activity in all mandibular movements but were silent or had negligible activity with the mandible in the rest position, when the head was rotated, and while clenching. Both bellies had marked to very marked activity during jaw opening, and moderate to marked activity during protrusion, retrusion and lateral movements. During swallowing the anterior and posterior bellies had patterns characterized by bursts of activity of high amplitude and short duration. The two bellies were not, however, always synchronously activ

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00142.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThe aim of this investigation was to evaluate the efficacy and convenience of decayed dentine removal with N‐monochloro‐DL‐2 aminobutyrate (CARIDEX) in all classes of cavities. Fifty‐seven patients, each with two teeth having similarly sized carious cavities, participated in this study. One cavity in each patient was treated with the chemomechanical CARIDEX technique and the other cavity was treated with conventional mechanical drilling. The cavities were restored with either amalgam, composite or glass ionomer restorative materials. The time taken for access and caries removal was noted and the efficacy of caries removal with each technique was evaluated. The chemomechanical caries removal technique was effective in removing 90–100% of decayed dentine in 98% of the cavities treated. Multiple regression adjusted access and caries removal time to account for volume of caries removed. This adjusted time was operator dependent, and ranged from 4 to 10 minutes longer for CARIDEX than for the conventional technique. Ninety‐three per cent of patients preferred the chemomechanical method of caries removal over the conventional technique (highly significantP<0·001). Even though the chemomechanical removal of caries is slower than the conventional technique, the efficacy of CARIDEX and its high patient acceptance provides a viable alternative method for dentinal caries removal in all classes

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00143.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryPatients suffering from temporomandibular joint dysfunction syndrome (TMJS) and healthy volunteers were examined by means of MMPI questionnaire and electromyography (masseter, anterior temporal and anterior digastric muscles) at rest and during natural chewing. In response to mental load (arithmetic chain task) TMJS patients showed an increase in postural activity and partly rhythmical short augmentations above the mean level of this activity. Chewing potentials were considerably diminished in patients compared with controls. There was evidence for neurotic disorders in the patients MMPI (neurotic triad: higher scores on hypochondria, depression, hysteria). Significant differences (multivariate variance and discriminant analysis: P<0.001) between patients and controls were found both in the group with psychic signs (MMPI scales) and in the group of quantitative electromyographic parameters. However, a sufficient discrimination was only obtained by a combination of both parameter groups. The results show that within the masticatory system, are important in the aetiopathogenesis of TMJS.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00144.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryAn improved impression technique is described using a plastic, transparent, flexible cap in combination with silicone impression materials. The technique can easily be applied at the chairside by the clinician and provides a solution to some of the present problems in impression with minimal trauma to the surrounding tissues.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00145.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryPatients treated in private practice and patients treated at the Department of Prosthetic Dentistry of the Faculty of Odontology in Gothenburg with fixed bridgework were questioned about their experience of their bridges. The interview was carried out with questionnaires and in some cases by telephone. The results were similar in both groups, and the patients were satisfied with the treatment.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00146.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryPeri‐implant tissues of the single‐crystal sapphire implant connected with neighbouring teeth by a metal bridge‐work were examined clinically, radiographically, and histologically in ten monkeys. Professional tooth cleaning was performed during the study. At 3–12 months after insertion, most of the implants were firmly connected to the surrounding tissues and peri‐implant gingiva was regarded as healthy, based on various periodontal parameter scores. Destructive changes of the peri‐implant bone were not found radiographically. Histologically peri‐implant gingiva was revealed to show similar structure to that of the gingiva around natural teeth. Direct bone‐implant interface was observed at 3 months after insertion, while a thin loose fibrous connective tissue layer was present between bone and implant at 6 and 12 months. Such different interrelationship between bone and implant might be attributable to the difference in distribution of fu

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00147.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryIn fourteen individuals unaware of mandibular dysfunction symptoms, latency and duration of the silent period in the masseter and anterior temporalis muscles at tooth tapping and jaw jerk were reasonably reproducible after 5 weeks and 5 months. Although the subjects felt no discomfort in the stomatognathic system, in some of them mild to moderate muscle tenderness, TMJ sound and occlusal disharmony were found at clinical examination. The relationship between these symptoms and the silent period was analysed. Muscle tenderness was the only factor to affect the silent period. The subjects with muscle soreness had a shorter duration of the silent period than the subjects without such symptoms.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00148.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryThe effect of bite force and stimulus intensity on the electrically induced SP has been studied. The results from the present study and earlier investigations suggest that the following guidelines should be used in future SP studies.(i)The electrical rather than mechanical way of stimulation should be preferred since the stimulus parameters and the receptors stimulated can easily be determined.(i1)The sensory perception threshold (T) of subjects should be used when studying and comparing the SP between individuals rather than the actual values of the electrical stimulation since the value of the sensory perception threshold varies from subject to subject.(iii)Rectified and averaged EMG records should be used rather than single raw traces since it is not possible to measure the duration of SPs from single traces.(iv)The subject should be asked to perform 25% of his/her MBF and the BF should be given as a feedback.(v)A stimulus intensity of about 6Tshould be used so that small changes in the BF would not affect the SPD.(vi)A jaw separation of about 10 mm should be selected in the subjects with normal overjet (2–3 mm), this being slightly thicker than the average isometric force transducer. The transducer can be brought to this thickness using acrylic resin.(vii)A head rest should be used to keep the head position constant (and hence constant jaw position with respect to the transducer) since the head position alone may change the reflexes elicited in the jaws regio

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00149.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

SummaryGlass ionomer cements have been commercially available for 10 years. Research has led to the production of improved formulations and the material is now advocated for use in a number of clinical situations. The aim of this review is to bring together the findings of published studies that provide information on the clinical uses and performance of this material.The opening section looks at the biocompatibility of the glass ionomer cements. Their clinical handling and techniques for use are then discussed. Finally, specific clinical uses are considered in the light of published clinical data.The glass ionomer cements appear to offer the profession many benefits and they are proving to be successful in a variety of clinical situations. Improvements in strength, abrasion resistance and colour matching will widen the scope of their application still further.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1988.tb00150.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY