摘要:

SummaryThe periapical radiograph is a tool used in the diagnosis of periapical bone pathology. Radiographic diagnosis might therefore influence endodontic treatment planning and the quality and the cost of dental health care. The hypotheses were tested that (1) the subjective prevalence of a lesion would be associated with the accuracy with which it is diagnosed, (2) ‘confident dentists’ would be as accurate in their diagnosis as ‘doubtful dentists’ and (3) the diagnostic confidence of dentists for the diagnosis of periapical pathology would not influence their treatment planning. It was found that the probability of an appropriate treatment decision increased when dentists were relatively confident about a diagnosis. The results showed, furthermore, that the accuracy of diagnostic decisions increased when the dentist's confidence about a particular decision was high. Ways to increase diagnostic accuracy of radiopaque periapical pathology are proposed as a result of thi

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00285.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryEpidemiological investigations from Scandinavia have documented high prevalence of apical periodontitis and inferior quality and results of endodontic treatment performed in general practice. The present investigation is part of a 20‐year follow‐up study on oral health in 35‐year‐old Oslo citizens focusing on endodontic con‐ditions. The results indicate reduced prevalence of apical periodontitis and statistically significant improvement in endodontic status compared with results from a similar study performe

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00286.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryA clinical case report is presented which illustrates internal root resorption of a traumatized tooth. Light and scanning electron microscope were used to further examine the defect. An explanation of the morphological structure of the resorption is discussed.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00287.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryCreative approaches to tooth maintenance often include tooth resection and retention of one or more of the roots. Although this procedure is reasonably successful, failure of supportive endodontic, periodontic, and restorative management of the retained roots can jeopardize a successful outcome. The following is a case report evaluating multiple aetiologies contributing to root resection failure.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00288.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryWhen the root canals are instrumented during endodontic therapy, a layer of material composed of dentine, remnants of pulp tissue and odontoblastic processes, and sometimes bacteria, is always formed on the canal walls. This layer has been called the smear layer. It has an amorphous, irregular and granular appearance under the scanning electron microscope. The advantages and disadvantages of the prescence of smear layer, and whether it should be removed or not from the instrumented root canals, are still controversial. It has been shown that this layer is not a complete barrier to bacteria and if delays but does not abolish the action of endodontic disinfectants. Endodontic smear layer also acts as a physical barrier interfering with adhesion and penetration of sealers into dentinal tubules. In turn, it may affect the sealing efficiency of root canal obturation. When it is not removed, the durability of the apical and coronal seal should be evaluated over a long period. If smear layer is to be removed, EDTA and NaOCI solutions have been shown to be effective, among various irrigation solutions and techniques, including ultrasonics, that have been tested. Once this layer is removed, it should be borne in mind that there is a risk of reinfecting dentinal tubules if the seal fails. Further studies are needed to establish the clinical importance of the absence or presence of smear layer.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00289.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryThe aim of thisin vitrostudy was to assess the efficacy of 10 currently available methods of producing radiographic images, two conventional and eight rapid, in working length estimation. Thirty extracted teeth comprising 42 root canals were mounted in blocks of poly(methylmethacrylate) and access cavities prepared. A size 15 Hedstrom file was inserted into each root canal and sealed into position. Each tooth was imaged by 10 methods: combinations of conventional (D−and E−speed) film processed with conventional manual chemistry or two proprietary brands of rapid processing chemistry (Westone Rapid Dental and Kodak ‘Rapid Access’), Super X30 packet processed film, Hanshin Hi‐Fi and Nix NF45‐100 films processed using their respective manufacturers' monobath solutions, and the Sens‐A‐Ray digital X‐ray system. Comparisons of length of file visible were made between the D‐speed films (conventionally processed using Kodak chemistry) and the nine other radiographic methods. No significant differences in percentage length of file seen were found between D‐speed film processed with conventional chemistry and E‐speed film processed with the same chemistry or between D‐speed film processed with conventional chemistry and six of the rapid imaging systems studied. The percentage length of the file visible was significantly less for Sens‐A‐Ray (P=0.02) and for Nix NF45‐100 film (P<0.005)when compared with D‐speed film processed with conventional chemistry. This difference in file length is probably not of clinical importance for the Sens‐A‐Ray im

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00290.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryThe reliability of two commonly used methods of sealability testing, dye leakage under normal atmospheric pressure and dye leakage in a partial vacuum, was tested using a repeated studies design. Forty extracted teeth were instrumented and obturated using lateral condensation of gutta‐percha and Sealapex™ sealer. One‐half of the teeth were placed in India ink under normal atmospheric pressure and the other half underwent air evacuation before immersion in the ink. After 24 h the teeth were removed from the ink and rendered transparent for linear leakage analysis. A second study, repeated within the exact parameters of the first, was performed approximately 1 month later. Mann‐Whitney U tests indicated that there was no significant difference (P>0.05) between the air and vacuum groups or within each group (air or vacuum) between trials, indicating that the methodology is repeatable and that application of reduced air pressure did not enhance reliability. A large majority of the teeth placed under partial vacuum showed evidence of vacuum‐induced artefacts that may negate the value of vacuum as a rese

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00291.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryThe proteoglycans synthesized by fibroblasts derived from healthy human adult dental pulps have been isolated and characterized on the basis of their glycosaminoglycan content, molecular size and charge. The proteoglycans were identified by their labelling with [35S] sulphate and susceptibility to digestion by papain. The sulphated glycosaminoglycans associated with the proteoglycans were identified following specific enzymatic and chemical degradations as chondroitin sulphate, dermatan sulphate and heparan sulphate. Dermatan sulphate and chondroitin sulphate were identified as the major glycosaminoglycans secreted into the medium, whereas chrondroitin sulphate and heparan sulphate were the principal glycosaminoglycans associated with the cell layers. The proteoglycans could be fractionated on the basis of their charge and size into a number of heterogeneous pools. The principal proteoglycans isolated were small and contained either chondroitin sulphate or dermatan sulphate and most likely correspond to decorin and biglycan. Other molecules with features similar to versican and syndecan were also identified.

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00292.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

SummaryTwenty‐six permanent vital molars with carious pulp exposures and periapical involvement presenting as radiolucencies or radiopacities on radiographic examination, in patients aged between 10–24 years, were treated using an atraumatic surgical technique with calcium hydroxide alone.The healing was evaluated using clinical and radiographic criteria: absence of clinical symptoms, sensitivity of the radicular pulp, formation of a hard tissue barrier in the exposed area, resolution of periapical involvement and no intraradicular pathosis radiographically. Assessed by these criteria, successful results were achieved in 24 teeth. The observation period following pulpotomy treatment was 16–72 months. The favourable results of this study demonstrate that pulpotomy treatment in teeth with cariously exposed vital pulps and with periapical involvement may be an alternative treatment to root canal th

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00293.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1995.tb00294.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY