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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 3
Endodontic Articles 3
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» The long-term sealing ability of an epoxy resin root canal sealer used with five gutta percha obturation techniques
By JofER editor | Published 03/14/2002 | Endodontic Articles 3 | Unrated
R. J. G. De Moor & G. M. G. Hommez
Department of Operative Dentistry and Endodontology, Dental School, University Hospital, University of Ghent, Ghent, Belgium.

Aim.
The aim of the present study was to evaluate the long-term sealing ability (both apical and coronal) of an epoxy resin root canal sealer (AH26) when used with different gutta-percha obturation techniques.

Conclusion.
Under the conditions of the present study, none of the gutta-percha obturation techniques combined with AH26 prevented coronal and apical leakage. Apical leakage increased during the first 4 months for cold lateral condensation, vertical condensation, hybrid condensation of gutta-percha, and for Thermafil and Soft- Core obturators. Coronal leakage increased during the 12 months in the condensation techniques, with the degree of coronal leakage always higher than apical leakage at the different observation times. Coronal leakage in the carrier techniques was greater at all periods for Soft- Core; for Thermafil coronal leakage was only higher than the non-carrier techniques during the first 4 months. The clinical impact of this in vitro study should be interpreted with caution.
» An in vitro comparison of the bactericidal efficacy of lethal photosensitization or sodium hyphochlorite irrigation on Streptococcus intermedius biofilms in root canals
By JofER editor | Published 03/14/2002 | Endodontic Articles 3 | Unrated

G. J. Seal, Y.-L. Ng, D. Spratt, M. Bhatti & K. Gulabivala
Departments of Conservative Dentistry and Microbiology, Eastman Dental Institute for Oral Health Care Sciences, University College London, London, UK.

Aim.
To compare the bacterial killing of Streptococcus intermedius biofilms in root canals using lethal photosensitization with various combinations of photosensitizer concentration and laser light dose or 3% sodium hypochlorite (NaOCl) irrigation.

Conclusions.
The combined use of a photosensitizing agent and a low power laser directed at the access cavity was bactericidal to S. intermedius biofilms in root canals but was unable to achieve total kill, unlike 3% NaOCl.

» Does the first file to bind correspond to the diameter of the canal in the apical region?
By JofER editor | Published 03/13/2002 | Endodontic Articles 3 | Unrated

M.-K. Wu, D. Barkis, A. Roris & P. R. Wesselink
Department of Cariology, Endodontology and Pedodontology, Academic Centre for Dentistry Amsterdam (ACTA), Amsterdam, the Netherlands.

Aim.
The aim of this study was to determine whether the first file that binds at the working length corresponds to the canal diameter.

Conclusions.
Neither the first K-file nor the first Lightspeed instrument that bound at the working length accurately reflected the diameter of the apical canal in curved mandibular premolars. It is uncertain whether dentine can be removed from the entire circumference of the canal wall by filing the root canal to three sizes larger than the file that binds first.

» Guided bone regeneration (GBR) using membranes and calcium sulphate after apicectomy: a comparative histomorphometrical study
By JofER editor | Published 03/12/2002 | Endodontic Articles 3 | Unrated

G. Yoshikawa, Y. Murashima, R. Wadachi, N. Sawada & H. Suda
Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.

Aim.
The purpose of the present study was to evaluate the effects of resorbable and non-resorbable membranes, and calcium sulphate on bone regeneration in osseous defects in conjunction with apicectomy.

Conclusions.
The findings of the present study showed that e-PTFE membrane was most effective for bone regeneration into osseous defects in conjunction with apicectomy; that the resorbable membranes used were not effective compared with controls; and, that calcium sulphate could be substituted for e-PTFE membrane. However, additional experiments are required to determine whether or not calcium sulphate is effective for complicated types of osseous defect, such as combined endodontic-periodontal lesions and through-and-through osseous defects.

» The dentinogenic effect of mineral trioxide aggregate (MTA) in short-term capping experiments
By JofER editor | Published 03/8/2002 | Endodontic Articles 3 | Unrated

D. Tziafas, O. Pantelidou, A. Alvanou, G. Belibasakis  & S. Papadimitriou
Departments of  Endodontology, School of Dentistry,  Histology and Embryology, Faculty of Medicine,
Clinical Sciences/Surgery Clinic, School of Veterinary Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Aim.
The objective of the present experiment was to study the early pulpal cell response and the onset of reparative dentine formation after capping application of MTA in mechanically exposed pulps.

Conclusions.
The present experiments indicate that MTA is an effective pulp-capping material, able to stimulate hard tissue bridge formation during the early wound healing process. The stereotypic pulp defence mechanism by which primitive matrix (fibrodentine) trigger expression of the odontoblastic potential of pulpal cells seems to be related to the dentinogenic activity of MTA. Further experimental data are needed to determine whether interactions between extracellular matrix components (including fibronectin) and endogenous signaling molecules (growth factors) take place after pulp capping with MTA.



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