Journal of Endodontics Research

M. Hulsmann, M. Heckendorff & F. Schafers
Department of Operative Dentistry, Preventive Dentistry and Periodontology, University of Gottingen, Gottingen, Germany.

Aim.
To compare the effect of three paste chelating agents on the root dentine of extracted teeth: Calcinase-Slide (lege artis, Dettenhausen, Germany), Glyde-File (DeTrey/Dentsply, Konstanz, Germany), RCPrep (Premier, Norristown, USA).

Conclusions.
The use of chelating pastes during root-canal preparation resulted in a measurable time-dependent weight loss and decrease of dentine microhardness. The use of chelator pastes under the conditions of the present study resulted in an improved cleanliness of the root-canal walls in the coronal and middle parts of the root canal.

L. B. Peters & P. R.Wesselink
Department of Cardiology Endodontology Pedodontology, Amsterdam Academic Centre for Dentistry, Amsterdam, Netherlands.

Aim.
The purpose of the present study is to evaluate the healing of periapical lesions of teeth with positive and negative canal cultures at the time of obturation, and to evaluate the periapical healing of teeth treated in one visit (without) or in two visits with an inter appointment dressing of calcium hydroxide.

Conclusions.
Within the limitations of this study, using teeth with a relatively simple anatomy, no significant differences in healing results occurred when small numbers of bacteria (CFU <102) could be cultured or not cultured at obturation. There was no significant difference in healing after root-canal treatment in one and two visits (with interappointment calcium hydroxide dressing). In order toquantitate the effects of treatment on healing in a similar prospective study, a very large group size is needed for definite conclusions.

M. Dartar Oztan, A. A. Akman, L. Zaimoglu & S. Bilgic
Department of Endodontics, Faculty of Dentistry, AnkaraUniversity.
Department of Physical Chemistry, Faculty of Science, Ankara University, Ankara,Turkey.

Aim.
The present study was designed to evaluate and compare the corrosion rates of the stainless-steel endodontic files when immersed in 0.2% chlorhexidine gluconate, 5.25% NaOCl, chlorinated soda with KOH, and 17% EDTA irrigating solutions.

Conclusions.
The findings of the present study indicated that the root canal irrigants 0.02% chlorhexidine gluconate, 5.25% NaOCl and chlorinated soda with KOH cause severe corrosion on the surface of stainless-steel files. Because corrosion decreases the cutting efficiency of endodontic files, irrigants should be rinsed from files as soon as possible after use and files should be replaced frequently.

F. Baratto Filho, E. L. Ferreira & L. F. Fariniuk
Department of Endodontics, School of Dentistry, Pontificia Universidade Catolica of Parana, Curitiba, Parana, Brazil.

Aim.
The objective of this study was to determine the effectiveness of 0.04 ProFile instruments during the removal of root fillings.

Conclusions.
The 0.04 ProFile system partially removed filling materials from the root canal system allowing the working length to be achieved rapidly, with the advantage that no solvent was required. However, cleaning was not ideal and would require complementary manual instrumentation for total elimination of filling material.

C.D. Lynch & F.M. Burke
Department of Restorative Dentistry, National University of Ireland, Cork, Ireland.

Aim.
To demonstrate the need for proper restoration of root-filled teeth.

Key learning points.

Failure to provide a root-filled tooth with a restoration incorporating adequate cuspal protection can lead to subsequent tooth fracture.
Large intracoronal restorations should be avoided when restoring root-filled teeth, particularly when marginal ridges have been lost.