摘要:

summaryThe purpose of this study was to assess longitudinally the success of partial and full crown abutment pairs in the same bridges. Fifty patients with a mean age of 45 years (range 22–70 years) were examined during spring 1981 (1–5 year follow‐up), 33 of whom were examined a second time during spring 1990 (10–15 year follow‐up). The status of the partial crowns, full crowns, and their abutment teeth was assessed using standardized questions, and clinical and radiographic examinations. At the first follow‐up examination, all partial and full crowns, and consequently all bridges, were still in use. Before the second follow‐up examination one of the full crown abutments had become badly decayed, and the bridge, including the partial crown, had been removed. The failure rate was 0.2% per year for the full crown as a unit, and consequently 0.2% per year for the bri

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01065.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThe effect of X‐ray beam angulation on the radiographic images of the amelocemental junction (ACJ) and alveolar crest (AC) and their positions relative to one another were assessed using a new laboratory model for radiographic studies. A total of 39 teeth with 62 usable approximal surfaces were included in the investigation. When all tooth types were combined, changes in vertical or horizontal angulation from baseline through 20° had no significant effect on the distance between the marked (true) ACJ and marked (true) AC. However, the distance between the apparent (radiographic) ACJ and apparent (radiographic) AC was significantly reduced by varying the beam angulation in either a vertical or horizontal direction. Results for individual tooth types were qualitatively similar but larger discrepancies were found in molars followed by premolars and incisors. The results emphasize the importance of maintaining the ideal X‐ray beam, tooth, bone, film relationship when taking radiographs for the assessment of periodontal destruc

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01066.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThe surface texture changes of three kinds of glass‐ionomer cements were compared with glazed and polished cement surfaces after thermal cycling in a storage media [lactic acid solution (pH 4.0)]. The changes were measured with regard to the surface roughness, colour‐change, gloss, hardness, toothbrush wear, and SEM (scanning electron microscope) observation in the laboratory. The glazed cement surface was not affected after thermal cycling in the lactic acid solut

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01067.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryPrimary splinting of fixtures with bar attachments has proved to be clinically effective for overdentures on osseointegrated implants in the edentulous mandible. However,in vitroinvestigations indicate that a more favourable force transfer to the individual fixtures can be attained by secondary splinting of four implants with conical double crowns. This observation could be confirmed in the present study by measurement of implant deflection in a model of the mandible by means of interferometric optical holography. Telescope crowns with conical interface brought about functionally more even movement characteristics of the implants compared to rigid or jointed bar attachments. Moreover, the conical double crowns always ensured a stable position of the denture in contrast to jointed attachments. These results underscore the need to test conical double crowns clinically as anchors for overdentures on osseointegrated implants.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01068.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThe present study investigated the asymmetry of masticatory muscle activity during maximal intercuspal clenching in healthy subjects and subjects with stomatognathic dysfunction syndrome. Stomatognathic dysfunction syndrome, unilateral mastication and the asymmetry of masticatory muscle activity appear to be related to each other. The asymmetry of masseter muscle activity was greater as stomatognathic dysfunction became increasingly severe. Because fatigue and pain are produced more quickly by unilateral clenching than bilateral clenching, clenching under conditions of left and right muscular imbalance can further aggravate stomatognathic dysfunction. It is suggested the asymmetry of masseter muscle activity during maximal clenching correlates with the onset of the stomagnathic dysfunction syndrome. Stomatognathic dysfunction syndrome is closely related to the asymmetry of masseter muscle activity and only slightly related to the asymmetry of temporal muscle activity. The asymmetry of anterior temporal muscle activity appears to have little clinical significance.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01069.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThe variable properties of photoelastic models and the difficulty of fabrication of the model limit experimental designs. The ‘material fringe value’ is introduced into the definition of the ‘stress concentration index’ by multiplying the fringe orders. Three levels of periodontal support in three photoelastic models (nine cases) were com‐pared quantitatively by determining the stress concentration induced in periodontium by point loading vertically on a span of the fixed partial denture of four units length. The results indicate that comparison among photoelastic models is possible and useful. The stress concentration effects produced by the second molar were more prominent and determinant than that by the first premolar in the periodontium of the

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01070.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThe effect of an Ag–Cu–Pd dispersant alloy on the structure of amalgams fabricated with two different particle types of low‐copper amalgam matrices was investigated. In amalgams L and L (0), a low‐copper lathe‐cut amalgam Aristalloy® was used as the matrix. In amalgams S and S(0), the matrix used was Spheralloy®, a low‐copper spherical amalgam. X‐ray diffraction was used to analyse the relative content of the phases in the amalgams. The presence of Pd in the dispersant of amalgams L and S resulted in a decrease in the amount of η′(Cu6Sn5) and an increase in the amount of unreacted particles when compared to the controls L(0) and S(0). Amalgams fabricated with a spherical alloy matrix (S and S(0)) showed a greater effect than amalgams fabricated with a lathe‐cut matri

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01071.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThirty‐six complete dentures were remounted both with check‐bite as well as central‐bearing‐point (CBP) registration. The mandibular or denture position was registered in the condylar area three times with each method. Two independent operators carried out the registrations. One half of patients had their occlusion equilibrated according to the check‐bite registration, the other half in the central‐bearing‐point position. After individual determination of the hinge axis the upper dentures were mounted by a face‐bow transfer into a Dentatus® articulator. A total of six registrations was performed and repeatedly compared in the condylar area in three dimensions using a computer supported measuring device. The reproducibility of the check‐bite registration was 0.37 ±0.33 mm, with a maximum of 1.77 mm. For the central‐bearing‐point method this was 0.29±0.26 mm with a maximum of 1.56 mm. The mean difference in condylar position between both methods was 0.66±0.55 mm with a maximum of 4.02 mm. A third independent operator re‐examined 30 of the patients 2–3 weeks after the remounting and evaluated the adaptation to the new dentures. Those patients whose dentures were equilibrated with the central‐bearing‐point method tended to cope better with their dentures and suffered on

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01072.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

summaryThe accumulation of food debris in the buccal vestibule can inhibit normal mastication and appears to be a factor that can cause patient discomfort. This study focused on the effect of the slope inclination of the buccal polished surface of the mandibular denture base on the ability to expel test‐food particles from the buccal vestibule. It was revealed that an inclination of the slope steeper than 80° markedly inhibits the normal ability to expel foods from the vestibule. It was revealed that the most appropriate inclination of the buccal slope is approximately 60° or 70°. These results could be utilized for constructing a denture prosth

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1995.tb01073.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY