摘要:

Summary.Calcium hydroxide is a material which has been used for a variety of purposes since its introduction into dentistry in the early part of the twentieth century. In its pure form, the substance has a high pH, and its dental use relates chiefly to its ability to stimulate mineralization, and also to its antibacterial properties. A range of products has been formulated with different therapeutic actions, the effects of which are partially dependent upon the tissue to which they are applied. The material is reviewed under the following general headings: biochemical actions; dental formulation; uses.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00108.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Summary.Three different techniques of silver cone retrieval were investigated in 41 teeth containing 91 silver cones. The techniques used for retrieval were as follows:(i)hand instrumentation with files, spoon excavators and forceps;(ii)the automated Canal‐Finder‐System;(iii)ultrasonic devices.In all teeth, these techniques were used in the same sequence, starting with hand instrumentation, followed by the Canal‐Finder‐System, and ending with ultrasonic devices. Fifty‐two of the 91 cones (57 per cent) could be removed with hand instruments. Of the remaining 39 cones, 19 were removed after using the Canal‐Finder‐System. An additional 10 cones could be removed after the use of ultrasonics. Two cones could only be bypassed by the Canal‐Finder‐System but were not removed with any of the techniques investigated in this study. Eight silver cones (9 per cent) could neither be bypassed nor removed. It was concluded that silver cone retrieval in more than half the cases could be performed easily with hand instruments, particularly spoon excavators. The automated Canal‐Finder‐System and ultrasonics proved to be helpful devices in many difficult cases, but did not guarantee

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00109.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Summary.The aim of thisin vitrostudy was to determine the effect on impact fracture resistance of three methods for restoration of root‐treated lower incisor teeth with otherwise intact natural crowns. In a control group (Group I) laterally condensed gutta‐percha filled the entire root canal, whereas part of the root filling was removed to enable insertion of a 1 mm diameter post in the other two groups. Stainless steel posts were placed in Group II and experimenral carbon fibre reinforced carbon (CFRC) in Group III. A composite resin luting agent was used to lute the posts, and standardized composite resin restorations were placed in each access cavity.Fifteen specimens of each group were tested to failure with a single impact force applied at 90 degrees to the mid‐point inciso‐cervically on the labial surface. The peak force, peak energy, and first peak total energy required to fracture each specimen were recorded. The results showed no significant difference between the three groups, nor was a difference in the mode or site of fracture observed.The results suggested that there is no advantage from the point of view of fracture mechanics in ‘restoring’ intact root‐treated teeth with either stainless steel or carbon fibre reinforce

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00110.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00111.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00112.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00113.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1990.tb00114.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY