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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 5
Endodontic Articles 5
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» External cervical resorption associated with localized gingival overgrowth
By JofER editor | Published 04/30/2002 | Endodontic Articles 5 | Unrated

K. Patel, U. R. Darbar & K. Gulabivala
Division of Restorative Dental Sciences, Eastman Dental Institute and Hospital for Oral Health Care Sciences, London, UK.

Aim.
To describe the presentation and management of an unusual lesion of external cervical resorption.

Summary.
The salient features of this unusual presentation of the external cervical resorption with localized gingival overgrowth, and the resorption located almost wholly on the labial aspect of a maxillary incisor crown are described. Extensive loss of enamel had occurred. The management and possible aetiology of the resorptive lesion are discussed.

Key learning points.

  • Localized gingival overgrowth can be associated with external cervical resorption.
  • The cervical resorption does not necessarily indicate pulp canal infection and the need for root-canal treatment.
» Root-canal treatment of a trifid crown premolar
By JofER editor | Published 04/27/2002 | Endodontic Articles 5 | Unrated

Y. Nahmias & M. E. Rampado
Department of Endodontics, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.

Aim.
To describe successful root-canal treatment of a permanent maxillary first premolar with unusual anatomy.

Summary.
A diagnosis of irreversible pulpitis of a geminated first premolar was made. Clinical and radiographic examination revealed a tooth with a trifid crown that joined to give the appearance of a single root at the cementoenamel junction. Root-canal treatment involved three separate access openings and treating four canals, three of which joined to exit through a common foramen.

Key learning points.

  • Symptomatic teeth with morphological aberrations can be saved by root-canal treatment.
  • Careful clinical and radiographic evaluation are essential, as treatment must be modified to address the unusual complexities of the root-canal system(s).
» Dynamic torque and apical forces of ProFile .04 rotary instruments during preparation of curved canals
By JofER editor | Published 04/24/2002 | Endodontic Articles 5 | Unrated

O. A. Peters & F. Barbakow
Department of Preventive Dentistry, Cariology and Periodontology, University of Zurich, Zurich, Switzerland.

Aim.
To analyse torque and force generated whilst shaping curved canals using rotary instruments.

Conclusions.

  1. Torsional moments can be evaluated during simulated preparation of curved root canals using the torque-testing device described in this paper.
  2. A specific sequence for ProFile .04 rotary instruments intended to produce large apical stops generated torque scores greater than 20 Nmm for size 35 and 40 instruments. Apically directed forces exceeded 1.5 N in all cases, but were less than 8 N.
  3. During simulated canal preparation, the number of revolutions did not exceed 41, indicating that up to 10 curved root canals can be safely prepared with a set of ProFile .04 rotary instruments.
» Effect of three root canal sealers on the retentive strength of endodontic posts luted with a resin cement
By JofER editor | Published 04/16/2002 | Endodontic Articles 5 | Unrated
M. S. Hagge, R. D. M. Wong & J. S. Lindemuth
Departments of Restorative Dentistry and Endodontics, University of the Pacific, San Francisco, USA.
Department of General Dentistry Resident Training, Travis Air Force Base, Fairfield, California, USA.


Aim.
This investigation examined what effect three different sealers had on retention of endodontic posts (Parapost) luted with a resin cement (Panavia 21 OP).

Conclusion.
Root canal sealers formulated with eugenol, resin, and calcium hydroxide bases had no statistically significant influence on the mean retention strength values of a passive endodontic post luted with a composite resin cement. Therefore, this study did not validate the rationale of avoiding eugenol-containing root canal sealers when subsequent intracanal dentine bonding is planned.
» Invasion of vascular cells in vitro by Porphyromonas endodontalis
By JofER editor | Published 04/15/2002 | Endodontic Articles 5 | Unrated

B. R. Dorn, L. J. Harris, C. T. Wujick, F. J. Vertucci & A. Progulske-Fox
Center for Molecular Microbiology, Department of Oral Biology,
Department of Endodontics, College of Dentistry, University of Florida, Gainesville, FL, USA.

Aim.
The objective of this study was to determine whether laboratory strains and clinical isolates of microorganisms associated with root canal infections can invade primary cultures of cardiovascular cells.

Results.
Of the laboratory and clinical strains tested, only P. endodontalis ATCC 35406 was invasive in an antibiotic protection assay using HCAEC and CASMC. Invasion of P. endodontalis ATCC 35406 was confirmed by transmission electron microscopy.



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