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Testing of root canal-shaping instruments on natural human teeth has many difficulties, because of the different anatomical forms of root canals. The method is also capable of registering only minor changes in curvature in the two-dimensional long axis of the canal. The method offers a means of determining curvatures precisely without random specification of reference points. At the outer curvature, the maximum displacement (1.8 mm) recorded was also the result of preparation with Ni-Ti hand files, while a displacement of only 0.3 mm to the apical foramen was recorded with the other systems.
#Aku shaper manual manual
The point of maximum curvature at the inner curvature was displaced by 1.6 mm to the apical foramen through manual preparation with Ni-Ti files. The Profile® system displayed the smallest changes in radius (−0.9 mm) even with the outer curvature, and manual preparation with stainless steel files the most pronounced change (−1.8 mm). The radius of the inner curvature decreased by 0.5–1.2 mm in the manual systems as a result of the preparation. An increase in maximum curvature was registered for all four shaping systems investigated. The maximum and the mean curvature as well as the length of the arc from the apical foramen to the point of maximum curvature were determined mathematically. Using an equalising function, the curvatures were first represented in graphic and algebraic form. The inner and outer curvatures were registered in a system of coordinates before and after preparation in increments of 0.5 mm. Twenty severely curved, simulated root canals were prepared with rotary FlexMaster® and Profile® instruments in the crown-down technique and manually in the step-back technique. The aim of this paper is to present a new method based on numeric calculus to provide data on any type of root canal curvature at any point of the long axis of the canal. Clinical X-rays of the teeth with permanent obturation clearly showed that extremes of the root canal morphology could be successfully solved by the right choice of all factors during endodontic procedure.
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The main reasons for choosing manual technique were complexity, shape of presented curvatures and better tactile sensation control of canal instruments in order to avoid possible mistakes and complications. Coronal to apical 'crown down' technique was used for the root canal preparation with hand NiTi ProTaper instruments with progressive multicone design. This article presents a complete endodontic procedure in two teeth with different curvature shape of the root canal in patients that were treated at the Department of Restorative Dentistry and Endodontics, School of Dentistry, Belgrade. The aim of this study was, on the basis of clinical practice, to show the possibilities of the endodontic treatment in the teeth with severely curved root canals, after dependable decision about endodontic instruments and techniques. Recently, new instruments and techniques have been introduced in the endodontic procedure. Endodontic treatment of the teeth with severe root canal curvatures has become one of the greatest problems in clinical practice.