摘要:

Summary.The effect on the apical seal of root filling teeth with two sealer cements that reacted chemically with tooth structure was studiedin vitro.In addition, apical leakage of teeth obturated with these materials and subsequently prepared to accept a post was tested. Ninety single‐rooted teeth with mature apices were prepared chemomechanically by the stepback technique using files and copious irrigation with 2.5 per cent sodium hypochlorite. The teeth were then randomly allocated to six groups of 15 teeth each. Two groups were root filled by lateral condensation of gutta‐percha and one of three sealer cements: Tubliseal, a radiopaque glass ionomer luting cement, Ketac Cem, and a chemically active composite resin, Panavia Ex. Thirty minutes later, in one group for each material, a post space was prepared leaving 4–5 nun of root filling at the apex. The extent of apical leakage in each group was determined after immersion in Indian ink for 14 days. The teeth were demineralized, dehydrated and immersed in methyl salicylate, which rendered them transparent, and a linear measurement of dye penetration was recorded.No statistically significant difference in the extent of leakage was found between the sealers in those groups which were filled by lateral condensation and left intact. However, the degree of leakage increased after post space preparation with the glass ionomer and Tubliseal groups, but was reduced in the Panavia Ex

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00807.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.Four hundred and fifty‐five extracted mandibular incisor and 340 extracted mandibuiar pretnolar teeth were radiographed to assess the incidence of twin canals as visualized on radiographs taken in the mesio‐distal direction. The ability to detect the presence of these twin canals by viewing radiographs taken in the standard bucco‐lingual direction was then assessed. Using the guideline that ‘disappearance or narrowing infers division’ when viewing these radiographs resulted in a failure to diagnose one‐third of the

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00808.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.A method for the construction of simulated root canals in clear resin blocks is described. The canals are inexpensive, simple to produce and are of high enough quality for use in both undergraduate and continuing education. With minor modifications, the canals can also be used for research, particularly during the assessment of instruments and preparation techniques.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00809.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.This paper describes the use of calcium hydroxide powder as an immediate plug before root canal obturation in the case of a root‐fractured upper centra] incisor that had been unresponsive to 18 months of treatment to create a calcific barrier. The calcium hydroxide plug allowed both good condensation of the filling material and prevention of extrusion of the root filling material which could have been detrimental to continued healing of the fractur

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00810.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Book reviewed in this article:Endodontics in clinical Practice3rd edn. F. J. HartyLocal Anaestheaia in Dentistsy3rd edn. G. L. Howe and F. I. H. Whitehead

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00811.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00812.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00813.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00814.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00815.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY