摘要:

SummaryThermometry was used to study the effect of applying a toothbrush to three types of oral mucosae, in forty dental students. Brushing with an electric tooth brush resulted in an immediate fall in temperature, but 3 min later the temperature was significantly higher than before stimulation. The temperature changes were greater in gingival crevice and attached gingiva compared with alveolar mucosa. Moreover, it was found that a static application of the toothbrush produced temperature changes which were equal to those following a dynamic application.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00424.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

summaryThermal changes occurring during the setting of restorative materials have been measured accurately using a differential scanning calorimeter. The results were used to evaluate setting characteristics. The heat of reaction and rate of heat output may be significant in determining thermal damage to the pulp. The heat capacity is related to thermal insulation properties. These properties have been determined and their effect on the efficacy of restorative materials discussed.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00425.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryA case of untreated tertiary syphilis involving the soft palate and nose is described and the treatment is outlined.In view of the rising incidence of acquired syphilis the clinician should bear this disease in mind whenever atypical lesions are encountered.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00426.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummarySeparate mean plaque scores of the proximal surfaces of abutment teeth, which faced denture saddles, were obtained from thirty‐three subjects with removable partial dentures, following a period of ordinary tooth‐brushing and at the end of a period following instruction in specialized tooth‐brushing. With ordinary tooth‐brushing, the subjects were distributed in the upper range of plaque scores which was considered dangerous to periodontal health. With specialized tooth‐brushing the subjects showed lower mean plaque scores, but over a wider distribution. Thus patients are variously at risk when treated with partial

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00427.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryA method for measuring masticatory efficiency is described as well as a mathematical formula expressing the masticatory efficiency as an index. A silicone compound was used as test material.The masticatory efficiency index was calculated as the mean of the best four out of five consecutive measurements of masticatory efficiency calculated from a specially designed formula.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00428.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummarySpecific ion meter studies have shown that ionic transport through bis‐GMA fissure sealant films is selective and that dissolved fluoride ions disappear from the solution around tooth sections at a more rapid rate than do calcium and chloride ions. This would indicate that topical fluoridation of pits and fissures can still be effected after placement of a fissure sealant. A causative mechanism for this phenomenon has been postulated. Calcium exchange studies indicate that calcium is removed from the enamel and that the microsolubility of fissure sealed teeth in CaCl2solution is increased by the preparative and sealing procedure used for the ename

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00429.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryEight adult human subjects exercised maximal voluntary tooth clenching until fatigue and pains were experienced, and could no longer be endured, in the right masseter muscle. The integrated electrical activity in the right masseter muscle was determined as a ratio of the different isometric exercises, and it showed a consistent decrease from onset of fatigue, via onset of pains, to the endurance of pains, possibly because of progressive muscle fatigue. The relative muscle activity might have determined the perception of the moment of onset of fatigue in the masseter muscle, and the perception of the moment of muscle exhaustion, but not the perception of the moment of onset of muscle pains.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00430.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryTemperatures were recorded in thirty‐two gingival crevices adjacent to proximal surfaces of abutment teeth fitted with minor connectors of an open space design, and in thirty gingival crevices adjacent to proximal surfaces fitted with minor connectors of a closed design. During the 2 week experimental period, the twenty‐seven removable partial denture subjects who were involved in the study kept the accumulation of plaque to a minimum by applying specialized tooth‐brushing. Although an equal but small amount of plaque formed in both groups, the presumed minimal rise in temperature stimulated by this plaque did not prevent the two connector designs from showing disparate effects on the crevicular temperature. It was concluded that the open space design of minor connector is less conducive to irritation of the adjacent marginal gingiva than is the closed d

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00431.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryThe strength of a brittle material depends upon the toughness of the material itself and the degree of perfection with which it can be placed. This study shows that both the compressive and tensile strength of calcium hydroxide lining materials is dependent on the fracture toughness at unstable crack propagation, Kic, and the size, number and distribution of pores (which are the defects that nucleate fracture). Of the products tested here, Dycal possesses the greatest actual strength due to a higher than average Kicvalue and relatively few isolated small pores. However, the greatest potential for strength exists in Reocap which has a Kicvalue a factor of 2.4 greater than its nearest rival (Dycal). Unfortunately its strength, as determined here, is less than Dycal due to the large number of pores in close proximity to each other.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00432.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryThis study aimed to assess possible fluoride uptake by cavity walls following a single application of Duraphat® around class V or I amalgam restorations which were inserted in seventeen human premolarsin vitroandin vivo. Six cavities were lined with one layer of Copalite® insertion of the restorations.After a weekin vivoand 12–24 hin vitro, 200–300 μm thick longitudinal sections passing through the cavities were prepared. By electron probe microanalysis F concentrations ranging from 2000 to 6000 ppm were measured near the surface of the cavity walls. Copalite seemed to inhibit F uptake. The study indicates that F ions released from the Duraphat varnish have been taken up by the cavity walls. Such uptake may influence development of secondary caries (wall lesions) in connection with amalgam restor

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb00433.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY