ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00883.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Summary.The causes of iatrogenic root canal obstructions are discussed in this paper. A classifications of the different obstructions is proposed, for which treatment plants with suitable armamentaria are suggested.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00884.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Summary.The major bacterial species in ferret plaque were indetified and the cytontoxicity of selected orginsismsin vitroassessed to determine their porential role in pulpal inflammation. Of the five species investigated in detail the cell fractions ofEscherichia coliandStreptococcus sanguisfrom anaerobic cultures. The release of a lysosomal enzyme was elicited to differing degree by all five bacterial species. While the amount of enzyme released from macrophages was greater, fibroblasts were generally more sensitive, with the media fraction in addition to the cellular fraction affecting cell numbers and enzyme release. The action ofS. faecalison both cell types was shown to be dose‐department. Since the number of bacteria involvedin vivois small these results suggest they would have little direct toxic effect indicating that some other mechanism must be invove

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00885.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Summary.This study investigated the movement of root canal sealer during the placing of a gutta‐percha root filling. Using transparent simulated tooth models, three techniques of introuducing sealer were examined; these were with the gutta‐percha point, with a reamer, or with a Lentulo spiral filler. The use of a Lentulo spiral filler showed consistently more apical extrusion of sealer than with the other techniques. The results demonstrated that the overall coating of sealer was not affected by whatever technique was emplo

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00886.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Summary.A method has been developed for producing measurable and reproducible coronal colour changes in teethin vitro. Two tecfhniques with different access preparations were assessed for the prevention of dehydration of enamel. Rclative discoloration was also compared in freshly extracted teeth and teeth which had been stored in ethanol. The most reproducible results were obtained with an immersion technique of humidity control and with apical access to the pulp chamber. Freshly extracted teeth or teeth stred in ethanol appeared to be equally suitable for determining the relative staining of the crown compared with the original tooth colour. It is considered that the method could be applied to studies for investigating the discolouring properties of endodontic materials.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00887.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Summary.This study was conducted to: (i) establish a monkey model system for studying the healing of root perforations, (ii) follow and define the normal healing processes of peiodontal tissues after root perforation and attempted repair, and (iii) assess the nature of periodontal tissue responses to a hard‐set calcium hydroxide treatment of experimental root perforations under aseptic conditions. Forty‐eight teeth of two rhesus monkeys were used. Twenty‐four root perforations were treated with a hard‐setting calcium hydroxide compound, while 24, sealed with teflon dises, served as controls. Observation periods were 2, 4, 7, 14, 21 and 42 days; radiographic and histological observations were conducted on each tooth. After the animals were killed, the tissues were demineralized and prepared for histological examination. Radiographs were taken at the time of perforation and again at the time of sacrifice.Following radiological and histological analysis, a number of observations were made. In both treatment and control groups, the teeth with lateral and furcal perforations presented the same sequence of tissue responses with time. Tissue responses at the wound sites and within the perforation canals were classified into three phases. The initial phase was characterized by blood clot formation, pronounced polymorphonuclear leucocyte infiltration, and incipient necrosis within the periodontal ligament coronal to the lateral lesions. The intermediate phase was characterized by resolution of the blood clot, granulation tissue formation, and resorption of necrotic debris, bone, cementum and dentine fragments. The late phase was characterized by resolution of the inflammation, maturation of the connective tissue, bone tissue healing with proliferation of trabecular bone into the perforation canal, reparative cementum formation along the cut dentinal wall in the perforation canal, and ankylosis in lateral lesions. Only four out of the 48 lesions developed bacterial contamination and abscess formation at the woun

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00888.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Book reviewed in this article:Oral Histology: Development, Structure and Function2nd edn, A. R. Ten Cate

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00889.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00890.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00891.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1986.tb00892.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY