摘要:

SummaryThe personality traits of 66 of a sample of 70 adolescents aged 19–21 years were reexamined after 5 years by means of a personality inventory (KSP). A total of 15 subjects had intact dentitions (group I), while 13 subjects had had some fillings in their teeth since the first examination (group FI), and 38 subjects had restored dentitions at both examinations (group F).The findings of this study are in agreement with those of the earlier study of Kampe, Edman and Molin (1986). On both occasions the subjects with restored dentitions had higher scores on the Somatic Anxiety and Muscular Tension scales. The differences were more pronounced for the female subjects. With regard to muscular tension, there was a significant interactive effect, with higher values for the female subjects in group F. Individuals with high scores for the Clinical Dysfunction Index (DiII and DiIII) also had the highest scores on the Somatic Anxiety and Muscular Tension scales, thus confirming the validity of the muscle palpation.The hypothesis of a correlation between personality factors and dental‐filling therapy was neither accepted nor rejected. The subjects in group F had the highest scores on both occasions on the Somatic Anxiety and Muscular Tension scales, although the subjects in group FI had the lowest scores. Further studies are required, and another 5‐year follow‐up study of this material could be con

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01682.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummarySigns and symptoms of temporomandibular dysfunction (TMD) and functional recordings were re‐examined in subjects, 19–21 years of age, 5 years after the first examination. Thirty‐seven subjects had restored dentitions at both examinations (group F), 13 subjects with previously intact dentitions had had fillings in their teeth during the follow‐up period (group FI), and 14 subjects had intact dentitions at both examinations (group I).In agreement with the first examination, the subjects with restored dentitions had a higher degree and frequency of TMD than the subjects with intact teeth. Most of the symptoms were mild, but more severe symptoms were reported by the subjects in group F, and female subjects in group F had more signs than male subjects. The subjects who had received fillings during the follow‐up period (group FI) constituted a group intermediate between group F and group I with regard to signs and symptoms of TMD. Frequent parafunction and more attrition were more common in group F. Together with the finding of increased muscle tenderness, this indicates more functional activity in restored dentitions. Correlation analysis did not reveal any relationship between occlusal factors and TMD.The findings of this study are consistent with those of the earlier investigation. Dental filling therapy appears to be an aetiological factor in TMD worthy of more consideration and more extensive

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01683.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThe aim of this study was to evaluate the level of residual monomer in acrylic denture base materials having different polymerization properties. The investigation included a conventional‐type acrylic cured under heat and pressure, as well as a pour‐type resin polymerized by an injection‐moulding technique at room temperature and under pressure. It was found that the residual monomer content ranged from 0·22–0·54% in pour‐type resin, and from 0·23–0·52% in routinely used resins when the specimens were analysed by high performance liquid chromatography. These findings revealed that there were no significant differences between the two types of acrylic in terms of their residual

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01684.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryFor analysis of time‐varying signals such as the TMJ sounds, it is often desirable to know how the frequency components change with time, using methods of time‐frequency analysis. The aim of this study was to compare two of the most familiar methods for energy density representation with a newly developed technique. The sounds were recorded with a microphone fastened to the subject's forehead, transformed to the time‐frequency domain and displayed as 3D‐ and contour plots using spectrogram, Wigner distribution (WD), and the reduced interference distribution (RID) to display their time‐frequency energy distributions. The spectrogram resolved only the low‐frequency components. The WD provided higher resolution but also exhibited strong interference between components. The RID gave a detailed representation of the TMJ signals' relative energy distribution in the time and frequency domains, with a great reduction in the interference or cross terms. The RID therefore appears to be most useful in the application of time‐frequency distributions in classification

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01685.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThe purpose of this study was to determine whether edentate subjects achieved different performance when using dentures constructed on different articulators. A cross‐over experimental design was employed to evaluate these swallow thresholds using complete dentures constructed on the hinge and free plane articulators. Seven subjects completed the study. Swallow threshold tests were performed 3 months after the insertion of dentures. The overall particle size distribution achieved with the dentures constructed on free plane articulators was significantly better at the end of the 3‐month period (P<0·01 toP<0·0001), but significantly more strokes were used to achieve this success rate (P<0·04). A questionnaire revealed that the subjects had a preference for the denture constructed on the free plane articulator. It is concluded that patients performed better with dentures constructed on the free plane artic

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01686.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThe adherence ofStreptococcus sanguisandS. mutansto seven restoratives in the presence and absence of an artificial salivary pellicle has been investigated. The physicochemical surface characteristics of the bacteria and of the restoratives were also measured, together with the effect of salivary coating of restoratives. Zeta potential of uncoated restoratives showed a positive correlation with the number of adherentS. mutanscells andS. sanguiscells.S. sanguisshowed a positive correlation with the hydrophobicity of uncoated restoratives. The surface hydrophobicity was decreased upon saliva coating, whereas the zeta potential was slightly increased. The contact angles or zeta potentials of saliva‐coated restoratives were positively correlated with those of uncoated restoratives. The number of adherent cells of bothS. sanguisandS. mutansto saliva‐coated restoratives were decreased after the coating. Zeta potential of saliva‐coated restoratives showed a positive correlation with the numbers of adherentS. mutanscells, suggesting that non‐specific electrostatic interactions have an important role in the adherence of this

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01687.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThe occlusal tooth contact patterns in patients with temporomandibular dysfunction and normal subjects were studied under a range of conditions using a newly devised radiotelemetry system. The patterns in the patient group were completely different from those in the control group. During rest or work, the patients showed higher values for total number and time of tooth contacts, as well as several contacts of extended duration. Moreover, many of the tooth contacts during swallowing were plural contacts in the patient group. These results suggest that patients with temporomandibular dysfunction exhibit increased tonus of jaw‐closing muscles, which is probably due to occlusal disharmonies and psychological stres

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01688.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryCalcium‐phosphate ceramic particulates are often used as filler material for enhanced repair of dental bone defects. Although evidence of bone ingrowth in the scaffold of these particles has been described, it is not observed consistently. Fibrous tissue often encapsulates these particles, which can subsequently become dispersed into the surrounding tissues or even exfoliated. The aim of the present study was to evaluate bioactive glass granules (Biogran ™)* as a filler for osseous lesions, and to compare them with two commercially available Hydroxylapatite (HA) granules. The particulates were implanted in the jaws of five beagle dogs, resected and evaluated after 1, 2, 3, 6 and 12 months of implantation. Histological analysis revealed an improvement in repair of all the lesions. A massive osteoconductive bone growth was seen near the walls of the bony cavities, but in greater amounts around the bioactive glass granules than around the HA materials. On top of this massive growth a trabecular bone growth was observed in the centre of the bony cavities. These trabeculae were associated with the glass particles, which exhibited osteophilic properties, while fibrous tissue separated the bone tissue from the HA particles. The centres of many of the particles are excavated, and are subsequently filled by newly formed bone tissue. This internally formed bone tissue is not necessarily connected to the surrounding bone tissue, and functions as a nucleation site for further bone repair. For the mesenchymal cells within the eroded glass particles this inner environment acts as a stimulus to differentiate into osteoblasts and to start their osteogenetic potential. This phenomenon was not observed around the HA materials. If the latter were surrounded by fibrous tissue, disintegration of the surface by giant cells was obser

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01689.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummarySeventy‐two migraine sufferers, whose attacks normally begin during or soon after waking from sleep, were compared with 37 age‐ and sex‐matched controls to establish whether signs of mandibular dysfunction, occlusal discrepancies and known clenching or grinding habits were any more frequent among the former group. Temporomandibular joint tenderness or pain history, masticatory muscle tenderness and known clenching or grinding habits were found to occur at significantly increased levels in the migraine sufferers, with two‐thirds of these patients reporting a parafunctional habit. Occlusal abnormalities, including non‐working side or protrusive interferences and slides of>1 mm to the intercuspal position, were found to occur at similar frequencies in the two groups. Assessment of wear of the occlusal surfaces also showed no difference, suggesting that any nocturnal habit with a role in migraine is more likely to be clenching in nature. In conclusion, evidence was found to support an aetiological role for nocturnal tooth clenching or grinding in migraine characterized by attacks that start predominantly during sleep or soon after waking, but no evidence of a link with occlusal factors was found in these

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01690.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

SummaryThe bending characteristics of various parapulpal pins, the retention of a parapulpal pin in different core buildup materials, and the fracture resistance of pin‐retained cores were investigated in anin‐vitrostudy. In amalgam and composite cores, the use of parapulpal pins produced an increase in fracture resistance. The highest fracture resistance values were observed in amalgam cores, and the lowest fracture strength was exhibited by cores of glass ionomer cements (GICs) containing metallic particles. The different parapulpal pins and their flexural rigidity had little effect on the fracture resistance of the pin‐retained cores. For extensive pin‐retained cores it appears advisable to use GICs with restraint and, particularly in the case of large‐scale bridge reconstructions, only after critical examination of the loading c

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1991.tb01691.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY