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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 7
Endodontic Articles 7
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» Shaping ability of GT Rotary Files in simulated resin root canals
By JofER editor | Published 07/10/2002 | Endodontic Articles 7 | Unrated
F.L.G. Calberson, C.A.J.G. Deroose, G.M.G. Hommez, H. Raes and R.J.G. DeMoor
Department of Operative Dentistry and Endodontology, Dental School, Ghent University Hospital, Ghent University, Gent, Belgium.
Department of Biology, Ghent University, Gent, Belgium.


Aim.
The aim of this study was to determine the shaping ability of GT Rotary Files in simulated root canals.

Conclusions.
Under the conditions of this study, GT Rotary Files produced acceptable canal shapes. In narrow and curved canals, the length of the straight section of the canal determines the direction of transportation more than the angle of the curve. In the 608 curves, a high incidence of instrument deformation was found when using the 0.04 tapered instruments.
» A study on the thickness of radicular dentine and cementum in anterior and premolar teeth
By JofER editor | Published 07/8/2002 | Endodontic Articles 7 | Unrated
C. Bellucci & N. Perrini
Private practice, Rome, Italy.
Accademia Italiana Endodonzia, Pistoia, Italy.


Aim.
This study aimed to measure the thickness of radicular dentine and cementum in incisors, canines and premolars, and to develop geometric average models.

Conclusions.
The aim of the study was to calculate an average thickness of root dentine and cementum for anterior and premolar teeth. The results obtained and the analysis conducted allowed the formulation of a hypothesis of a ‘standard average’ form for each group of teeth. Based on the results of this study, the following conclusions were drawn:
  1. Wall thicknesses varied greatly.
  2. Generally, thicknesses were greater on the lingual surfaces of the roots.
  3. Statistically significant differences between thicknesses in the mesial and distal surfaces of the roots were observed only in one case. Nevertheless, many roots were flattened mesio-distally.
  4. Wall thickness was thin in the apical third.
» In vivo determination of root canal length: a preliminary report using the Tri Auto ZX apex-locating handpiece
By JofER editor | Published 07/6/2002 | Endodontic Articles 7 | Unrated
F. Grimberg, G. Banegas, L. Chiacchio & O. Zmener
Department of Adult Dental Care, Faculty of Odontology, University of Buenos Aires, Argentina.

Aim.
The aim of this study was to assess the clinical perfomance of a cordless handpiece with a built-in apex locator - the Tri Auto ZX - designed for root canal preparation with nickel-titanium rotary files.

Conclusions.
Firstly, the EL and ARL were coincident in all instances. When both EL and ARL were compared with AL, the values registered were either coincident or different in +-0.5 mm from the AL (P < 0.05). Secondly, the Tri Auto ZX system protects against overpreparation.
» Effects of rotary instruments and ultrasonic irrigation on debris and smear layer scores: a scanning electron microscopic study
By JofER editor | Published 07/4/2002 | Endodontic Articles 7 | Unrated
B. E. Mayer, O. A. Peters & F. Barbakow
Department of Preventive Dentistry, Cariology and Periodontology, University of Zurich, Switzerland.

Aim.
This study evaluated debris and smear layer scores after two types of instruments manufactured from different alloys were used to ultrasonically activate irrigants during canal preparation. The influence of two rotary preparation techniques on cleanliness of the shaped canals was also studied.

Conclusion.
Under the conditions of this study, ultrasonically activated irrigation did not reduce debris nor smear layer scores of prepared root canals. This finding was not influenced by the design of nor the material used to fabricate the ultrasonic tips used to transmit ultrasonic energy. No significant differences in cleaning root canals were recorded between the Lightspeed and ProFile .04 rotary instruments evaluated.
» The ferrule effect: a literature review
By JofER editor | Published 07/2/2002 | Endodontic Articles 7 | Unrated
N. R. Stankiewicz & P. R.Wilson
General Dental Practice, Bath, UK.
School of Dental Science, The University of Melbourne, Melbourne, Australia.


Literature review.
A ferrule is a metal ring or cap used to strengthen the end of a stick or tube. It has been proposed that the use of a ferrule as part of the core or artificial crown may be of benefit in reinforcing root-filled teeth. A review of the literature investigating this effect is presented. The literature demonstrates that a ferrule effect occurs owing to the artificial crown bracing against the dentine extending coronal to the crown margin. Overall, it can be concluded that a ferrule is desirable, but should not be provided at the expense of the remaining tooth/root structure.


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