摘要:

SummaryThe effect of the interdental brush was evaluated on sixty‐seven extracted teeth which were stained and examined under the stereomicroscope. Thirty‐one of the teeth were totally covered with plaque when the interdental brush was used on them immediately before extraction. Thirty‐six of the teeth were from patients who had used the interdental brush routinely for several years. The interdental brush was found to have an excellent effect both in the central part of the interdental space and on the embrasures. However, the most noteworthy finding was that it removes plaque as far as 2‐2½ mm below the gingival margin. This means that restorations can be kept free of plaque, even if they are extended into the pocket. In modern dentistry ‘extension for prevention of dental caries’ has become a controversial principle because subgingival restorations retain plaque which induces destructive periodontal disease. In many cases this problem can be solved by introducing the inter

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00934.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryPlaque formation on forty‐four teeth acting as abutments for removable partial dentures was studied while the patients were wearing their dentures and while they were not. The amount of plaque was assessed according to Quigley&Hein (1962), modified by Kardel&Bay (1967). In addition, that formed occlusally was evaluated by an occlusal plaque scoring index designed for the present study.It was found that the wearing of partial dentures increased the formation of plaque on all tooth surfaces under investigatio

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00935.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryA method of measuring toothbrush‐dentifrice abrasion of restorative materials is described. The method also includes a quantitative assessment of surface roughness. Values of wear and surface roughness of a range of restorative materials are presente

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00936.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryThe ability of a common dental plaque bacterium,Streptococcus sanguis, to adhere to dental crown and bridge cementsin vitrowas investigated. Cylindrical blocks of five different commercial brands of cement, with and without acquired pellicles, were incubated with buffer suspensions of S. sanguis for 1 h. Attached bacteria were counted under the microscope. S.sanguishad particularly high affinity for uncoated resin cement. In contrast, the carboxylate cement tested was a poor substrate for the adherence of this bacterium. The other cement types (zinc phosphate, zinc oxide and silico‐phosphate) had intermediary qualities as adhering surfaces.The presence of an acquired pellicle, obtained by pretreatment with saliva, influenced the initial adherence of bacteria to cementin vitro. On the resin cement a salivary pellicle strongly suppressed the bacterial adhesion. For the zinc phosphate, zinc oxide and silico‐phosphate cements a pellicle slightly enhanced the attachment ofS. sanguis. On the carboxylate cement only few organisms attached also after pretreatment with sal

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00937.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryThe mandibular dentures of eighteen patients who suffered from chronic tissue soreness beneath the denture which could not be relieved by bringing the denture into a functionally faultless condition, were furnished with a soft lining. Of the patients re‐examined after 2 weeks, 89% were symptom‐free. After 6 months, 1, 2 and 3 years the percentages of the symptom‐free patients were 64, 79, 60 and 71% of the total re‐examined. However, after soft lining, some relief of the complaint was reported by all patients of the series.The series included a woman with bronchial asthma whose oral mucosa again became sore after she had worn the denture with soft lining for a year, and a bruxist who had a definite relief.The percentage incidence of denture stomatitis increased in the course of the 3‐year period studied. At the listed dates of re‐examination, it was 25, 46, 43, 80 and 100%, r

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00938.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryThe physical and mechanical properties of samples of a nickel‐base alloy fabricated by powder metallurgy were determined. The particle sizes of the powders used to make the samples varied from –80/+ 200 mesh to –325 mesh. The compaction pressure varied from 138 to 414 MN/m2and the sintering temperature varied from 1150 to 1250°C. The shrinkage during processing, the porosity, tensile strength, yield strength, elongation, and elastic modulus were used to characterize the samples. The strength of the samples generally increased with decreasing particle size of the powder and increasing compaction pressure and sintering temperatures. The porosity and strength, therefore, could be varied over a wide range by controlling the various parameters. The properties of the samples prepared by powder metallurgy were compared with those of the cast alloy and compact bone. Conditions can be selected that will yield equivalent or better properties by powder metallurgy than by c

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00939.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryThe linear dimensional changes of two polycarboxylate cements have been studied. The measurements were performed on specimens placed on a mercury bath, and were started 3 min after commencing the mix. The specimens were allowed to set at 37°C under various environmental humidity.Specimens from one of the polycarboxylate cements (Durelon®), were made using both the universal liquid and the thin liquid meant for cementation. The powder/ liquid ratios (P/L) were either 2.5 or 1.5.Specimens from the second cement (Poly‐C®), were made using the liquid meant for cementation only with a P/L of 1.5.The dimensional changes of Durelon were dependent on the powder/liquid ratio and the environmental humidity during setting. Under dry conditions this cement showed a maximum contraction of 4.60% after 14 days when a high P/L was used and 6.10% when a low P/L was used. After 1 day under wet conditions no significant differences between cements with high and low P/L were registered, and the mean contraction was 1.10%.The dimensional changes of Poly‐C were dependent on the environmental humidity, and after 14 days under dry conditions a maximum contraction of 5.50% was registered and after 1 day under wet conditions a contraction of 0.60%.The contraction of the polycarboxylate cements tested in this study started earlier and were in general more pronounced than that observed for a zinc phosphate cement (Øilo

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00940.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00941.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryAn outline of the indications for, and construction of the night guard have been presented. Comment is made on its bio‐mechanical value and on the dangers of its abus

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00942.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

SummaryAcid etching has been shown to be necessary to increase the bond strength of the polymeric fissure sealants Epoxylite 9075 and Nuva Seal to enamel. For Nuva Seal or Epoxylite 9075 it would appear that it does not matter which concentration between the concentration levels of 30 and 70% is used.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1976.tb00943.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY