摘要:

Summary.An apical dentine sampling technique was applied in order to monitor the bacteriology of the pulp canal and radicular dentine before and during treatment of teeth with chronic apical periodondtis. Twenty‐three teeth with a radiographic diagnosis of apical periodontitis were studied. They were subjected to a standardized two‐appointment treatment regimen of extensive apical reaming in the absence of antimicrobial agents and 1‐week dressing with calcium hydroxide. Bacteriological samples were taken from the root canal at the start, and apical dentine samples at the end, of each sitting. Provision was made to allow growth of anaerobic bacteria. All root canals but one showed growth at the start of treatment. Dentine samples were positive in 14 of the 23 teeth at the end of the first appointment. Eight of the 23 canals had detectable growth from the canal at the start of the second appointment, but in sufficient numbers for quantification in only one root canal. The subsequent dentine sampies were otherwise negative at the second appointment. There was a tendency for teeth causing symptoms to harbour more bacteria than symptomless

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00863.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.This study reports on the occurrence of class II antigen expressing cells in inflammatory lesions experimentally induced in the rat incisor pulp. Concanavalin A and lipopolysaccharide ofBacteroides gingivaliswere applied to the exposed pulp following a preparation through alveolar bone and dental tissues in the midpart of the root. In a set of control teeth, pulpal exposures were capped with Cavit without the placement of antigenic material. Animals were killed after 3, 12, 24, 48 or 96 hours. Pulp tissue specimens were subjected to immunohistochemical analysis utilizing a monoclonal mouse anti‐rat class II antigen antibody. Semi‐quantitative assessment of positively stained ceils was carried out under the light microscope. Significantly more class II antigen expressing cells were identified in the challenged pulps than in the controls at all experimental periods. The increase in cells peaked at 48 hours to taper off at the subsequent 96‐hour observation. The rapid and intense influx of class II antigen expressing cells suggests that these cells are associated with the initial defence of the dental

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00864.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.Nine endodontic instruments from different manufacturers (Reamers, K‐files, Hedstrom files, K‐FIex files, Flexofiles, S‐files, Burns Unifiles, Flexicut files and Flex‐R files) were used to prepare 180 simulated root canals in resin blocks. The instrument's ability to reproduce a theoretical pre‐established ideal canal shape was assessed by comparing the original canal path with the resulting enlarged canal shape by a double exposure photographic method. The individual ability of each instrument to transport debris was also observed during instrumentation under a stereomicroscope. Regardless of the instrument type, none was able to reproduce ideal results; however, clinically acceptable results could be obtained with all of them. The coronal and apical debris transportation characteristics proved to be similar with all in

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00865.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.The purpose of the study was to compare the flare‐up rate for single‐visit endodontics among teeth without radiographic or clinical signs of apical periodontitis, those with radiographic or clinical signs of apical periodontitis not previously root‐treated, and those with apical periodontitis where retreatment was performed.All teeth were instrumented to a predetermined minimum size with a 0.5 per cent solution of sodium hypochlorite being used as the irrigant. The root canal was obturated without regard to the presence or absence of symptoms or diagnosis of the apical condition. The patients were given written postoperative instructions and a prescription for 600 mg ibuprofen to be taken if mild to moderate pain developed. If severe pain and/or swelling developed, the patient was instructed to telephone immediately and was considered to have had a flare‐up.Teeth without signs of apical periodontitis did not have any flare‐ups. One flare‐up occurred in 69 teeth with signs of apical periodontitis not previously root‐treated. The majority of the flare‐ups (3 of 22 teeth) occurred in teeth with signs of apical periodontitis requir

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00866.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.Anin‐vitroradiographic study of human teeth was performed in order to evaluate the ability of radiographs to determine the location of the apical foramen. The tip of an endodontic file was positioned at the apical foramen of each canal in 117 extracted human teeth (213 canals) and in 56 teeth (92 canals) still within the alveolus of dried jaw specimens. Parallel radiographs were taken in a bucco‐lingual plane of all teeth. The tip of the instrument appeared to be at the root surface (apical foramen) in 82 per cent of canals. There was no significant difference in results between the teeth radiographed in alveolus of dried jaw specimens and extracted teeth when the radiographs were evaluated under a stereomicrosc

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00867.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Summary.A 42‐year‐old man had been previously hit in the mouth when he was 12 years old, and the upper left central incisor was completely avulsed. The patient immediately replanted the tooth and did not seek any dental treatment. After 28 years he noticed discoloration and abscess formation. Root canal treatment was performed, and the tooth has remained in a stable, functional posit

ISSN:0143-2885    

DOI:10.1111/j.1365-2591.1991.tb00868.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.tb00869.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.tb00870.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY