摘要:

The microscopic characteristics of the mucosa covering the alveolar ridge that supports a complete denture have long been studied. In this paper, any histological changes in mucosa loaded by a denture before and after a denture has been anchored by implant onto the bone were followed. The results suggest that mechanical loads improve trophism of mucosa, and that fixing a denture to implants leads to a more uniform distribution of loads.

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.d01-182.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY

摘要:

Secondary school Saudi students participated in a questionnaire about stomatognathic dysfunction symptoms. The adolescents were interviewed about general health, peripheral joint disease, chewing function, oral parafunctions, and symptoms of dysfunction. Thirty‐two per cent of participants had at least one dysfunction symptom. Pain on opening was the most common (35·7%), followed by headache (33·6%), and joint sounds (32·2%). Symptoms increased with decline in general health, particularly the health of peripheral joints. Chewing functions were not impaired. Tooth loss did not affect dysfunction symptoms in adolescents, whilst a weak relation was evident between oral parafunctions and symptoms of mandibular dysfunc

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.d01-181.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY

摘要:

The quasi‐3D technique of photoelastic stress analysis was used to evaluate the stresses of mandibular posterior cantilevers for distal terminal abutments at various levels of periodontal support. The stress concentration index was selected to compare each model. The periodontal support of terminal abutment and the length of pontic must be considered, when a cantilever fixed partial denture is anticipate

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.d01-183.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY

摘要:

In this study the wear of mandibular acrylic resin teeth opposed by porcelain maxillary teeth arranged in a lingualized occlusal scheme over a period of 3 years was measured. Six edentulous subjects received complete dentures as above and with three baseline markers of amalgam. At yearly intervals casts were made of the mandibular occlusal surfaces, including markers, and plotted by stereophotogrammetry. Volumetric loss of material was quantifiable. Ranges of 0·62–3·33 mm3/mm2on the left side and 0·71–1·64 mm3/mm2on the right were recorded. Friedman two‐way ANOVA test indicated significant wear on teeth 35, 36, 45 and 46 but not on 34 and 44. A one‐sided chewer displayed greater wear on the contralateral side, a finding difficult

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.d01-178.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY

摘要:

This pilot study compared stress distribution using photoelastic blocks for both vertical loading and oblique loading (26° angle) for four groups of post systems (Flexi‐Post®, Flexi‐Flange®, ParaPost®and AccessPost™ dowels). For each group, three test blocks of photoelastic material were prepared with simulated endodontic canals, and the specimens were then photographed. Minimal stresses were observed for all the posts after cementation in the unloaded state. Stress distribution for the Flexi‐Post, Flexi‐Flange and AccessPost were favourable under vertical loading at 134 N and oblique loadings of 89 N and 134 N. Stress patterns were symmetric over the entire length of these posts. Stress distribution for the ParaPost under vertical loading at 134 N generated stress patterns that were asymmetric with concentration of stresses apically compared to coronally. Stress distribution for the ParaPost during oblique loadings of 89 N and 134 N were asymmetric with stress concentrated apically as compared to coronally. Stress distribution for the Flexi‐Post, Flexi‐Flange and AccessPost were all favourable under loading c

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.d01-180.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY

摘要:

In 46 non‐patients and 46 patients, the authors examined the presence (+) and the absence (‐) of laterotrusive (LG) and mediotrusive (MG) tooth guidance, i.e. dynamic dental articulation events in contrast to static dental occlusion events. During a right and left laterotrusion/mediotrusion of the mandible, the number of compound, mutually exclusive and exhaustive tooth guidance events (possibilities) was six. In addition, the presence and the absence of temporomandibular joint (TMJ) sounds, provoked TMJ pains, and the associations between TMJ sounds and tooth guidance events were examined. In non‐patients, LG+ and MG+ was relatively infrequent (30%) while LG+ and MG‐ was relatively frequent (70%). In patients, LG+ and MG+ was relatively frequent (58%) while LG+ and MG‐ was relatively infrequent (42%). LG‐ and MG+ was absent in non‐patients and rare in patients (3%). Either unilateral or bilateral MG+ was relatively infrequent in non‐patients (30%) and relatively frequent in patients (59%). Bilateral MG+ was relatively infrequent in non‐patients (20%) and relatively frequent in patients (52%). Either unilateral or bilateral TMJ sounds were relatively infrequent in non‐patients (39%) and relatively frequent in patients (74%). Either unilateral or bilateral provoked TMJ pains were absent in non‐patients and relatively frequent in patients (72%). The authors found no evidence that TMJ sounds were associated with the ipsilateral absence of so‐called balancing contacts (MG‐) in non‐patients and patients. Finally, no evidence supporting the use of a so‐called positive predictive value, an ‘extension concept

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.d01-177.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY

摘要:

The aim of this study was to develop a method of studying the effects of mandibular advancement on oropharyngeal airway dimensions in the sagittal plane in conscious, supine patients. Six white, dentate, male patients with proven obstructive sleep apnoea had sagittal fluoroscopic recordings taken in the resting supine position. Images were recorded at four frames per second as the mandible was advanced with the teeth in contact to maximum protrusion and then opened. Software in the fluoroscopic imaging system permitted measurement of the change in mandibular position together with oropharyngeal airway dimensions expressed as the narrowest dimension observable in the post‐palatal and post‐lingual sites. Plotting of airway dimensions during mandibular advancement enabled estimation of the degree of protrusion associated with maximal airway benefits. Progressive mandibular advancement produced variable adaptive changes in the post‐palatal and post‐lingual regions of the oropharynx. The amount of airway opening appeared to be related to the horizontal and vertical relationships of the face and to the dimensions of the soft palate. The changes in post‐palatal and post‐lingual airway dimensions were not always identical, despite the observation that both tongue and soft palate were seen to move in unison, with close contact being maintained between the two structures. Jaw opening resulted in synchronous posterior movement of both tongue and soft palate, with consequent narrowing of oropharyngeal airspace. Fluoroscopy is a simple method of assessing upper airway changes with mandibular advancement in the conscious patient. The technique should facilitate the selection of subjects for whom mandibular advancement would seem advantageous. The nature of the adaptive response is dependent on individual structural variation. It is suggested that, where artificial mandibular advancement with dental devices is considered beneficial, jaw opening should be kept t

ISSN:0305-182X    

DOI:10.1046/j.1365-2842.1996.00416.x

出版商:Blackwell Science Ltd    

年代:1996

数据来源: WILEY