Abstract
The aim of this study was to assess the correlation between the degree of angulation and the position of root curvatures and their influence on the comparative results between the performances of the Progressive, Staged and Serial Preparation Techniques. The mesiobucal canals of 70 extracted mandibular molars were filled with a radiological contrast of 100% Barium sulphate and radiographed with a direct digital radiographic system, in an apparatus that guarantees that the samples remain in the same spatial position at all times. The images were then analyzed in the Coreldraw 10 program (MicroSafe, RJ, Brasil) in accordance with two criteria: the methods of Berbert, Nishiyama(1) (1994) and Schneider11 (1971) to determine the position and the angle of the root curvatures, respectively. Initially, the possibility of correlation between these two variables was studied. The teeth were then selected according to angulation (greater than 25 degrees) and position of root curvatures (cervical, median and apical) in order to perform the endodontic techniques. After preparation, the samples were radiographed again and the images were superimposed in order to compare the pre- and post-operative areas. The difference between them showed the percentage of widening for each technique. The results showed that there was no correlation between the angulations and the root curvature positions, and that the different positions did not interfere in the performance of the techniques. The Progressive Preparation technique produced the highest widening values for all the groups, irrespective of the root curvature position.
Highlights
Chemical-surgical preparation is the stage of endodontic treatment in which the root canal is cleaned and modeled
The existence of alterations in the internal anatomy of the root canal may make it difficult to carry out treatment
Various positions and angulations of root curvatures, isthmuses, among other alterations, involve specific requirements for performing a good modeling. It is imperative for the professional who is going to work in Endodontics to have knowledge of the internal anatomy, to allow planning of the endodontic procedure, access to the pulp chamber and final obturation
Summary
Chemical-surgical preparation is the stage of endodontic treatment in which the root canal is cleaned and modeled If this is well done, it should allow an enlargement of the original canal space without deforming it, enabling a three-dimensional obturation to be done, promoting the repair of the periapical tissues. Various positions and angulations of root curvatures, isthmuses, among other alterations, involve specific requirements for performing a good modeling. It is imperative for the professional who is going to work in Endodontics to have knowledge of the internal anatomy, to allow planning of the endodontic procedure, access to the pulp chamber and final obturation. Curvatures have been classified as slight (up to five degrees), moderate (from five to twenty degrees) and severe (greater than twenty-five degrees)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
