Analyzing Relation of Canal Operating Force and Canal Curvature in RCT: A Mathematical Overview
About: This article is published in Materials Today: Proceedings.The article was published on 2021-01-01. It has received 1 citations till now. The article focuses on the topics: Curvature.
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TL;DR: In this paper , the root canal center line curvatures and their cross-sectional dimensions are used to determine the geometry of a root canal model, which is based on the measurement and statistical evaluation of the root canal center line's curvatures.
Abstract: Models of artificial root canals are used in several fields of endodontic investigations and pre-clinical endodontic training. They allow the physical testing of dental treatments, the operating of instruments used and the interaction between these instruments and the tissues. Currently, a large number of different artificial root canal models exist whose geometry is created either on the basis of selected natural root canal systems or to represent individual geometrical properties. Currently, only a few geometric properties such as the root canal curvature or the endodontic working width are taken into consideration when generating these models. To improve the representational capability of the artificial root canal models, the aim of the current study is therefore to generate an artificial root canal based on the statistical evaluation of selected natural root canals. Here, the approach introduced by Kucher for determining the geometry of a root canal model is used, which is based on the measurement and statistical evaluation of the root canal center line’s curvatures and their cross-sectional dimensions. Using the example of unbranched distal root canals of mandibular molars (n = 29), an artificial root canal model representing the mean length, curvature, torsion and cross-sectional dimensions of these teeth could be derived.
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TL;DR: The predictability from clinical and radiographic signs of the treatment-outcome in individual cases with preoperative periapical lesions cases was found to be low and factors which were not measured or identified may be critical to the outcome of endodontic treatment.
1,615 citations
TL;DR: The purpose of this paper is to discuss the aetiology of the failure of root canal treatment, particularly in cases of well-treated root canals, and indications for the treatment of endodontic failures.
Abstract: Siqueira JF, Jr. Aetiology of root canal treatment failure: why well-treated teeth can fail (Literature review). International Endodontic Journal , 34 , 1‐10, 2001. Literature review Root canal treatment usually fails when the treatment is carried out inadequately. However, there are some cases in which the treatment has followed the highest standards yet still results in failure. In most of the cases, the endodontic failure results from persistent or secondary intraradicular infection. Extraradicular infections may also be implicated in the failure of some cases. In addition, it has been claimed that a few cases can fail because of intrinsic or extrinsic nonmicrobial factors. The purpose of this paper is to discuss the aetiology of the failure of root canal treatment, particularly in cases of well-treated root canals. Indications for the treatment of endodontic failures are also discussed.
839 citations
TL;DR: The method of canal preparation and the position of the apical seal relative to the radiographic apex were both found to be significant and the overall success rate was 84.29%, representing 692 of 821 teeth included in the survey.
Abstract: This retrospective study on the outcome of conventional root canal therapy was carried out on patients attending the Eastman Dental Hospital between 1970 and 1982. A minimum follow-up period of 5 years was required for patients to be included in the survey. The characteristics of the resulting sample group, the techniques for canal preparation and obturation and the obturating materials used were analysed. The type of obturating material used had no demonstrable effect on success rate but sex, age, preoperative vitality and periapical pathology were associated with significantly differing success rates. Technique also influenced success rate; the method of canal preparation and the position of the apical seal relative to the radiographic apex were both found to be significant. The overall success rate was 84.29%, representing 692 of 821 teeth included in the survey.
253 citations
TL;DR: The aim of this study was to use a force analyzer device, the modified Endographe with a new cupule, to compare the forces and wedging effects developed in the root canal using four obturation techniques: warm vertical compaction, lateral condensation, thermomechanicalCompaction, and Thermafil condensation.
47 citations
TL;DR: The technique using melted gutta percha may not be favourable compared with the conventional lateral condensation technique because melted guttha percha undergoes a large amount of shrinkage during setting.
Abstract: The purpose of this investigation was to investigate the rheological properties of four commercially available gutta perchas for root canal filling. The relaxation modulus [Gr(0): instantaneous shear modulus] and specific volume of their materials were examined. In addition, the quantity of heat was also studied by differential scanning calorimeter. In a lower temperature range than the first-order transition temperature (melting point), the Gr(0) values of each material were almost identical. A marked decrease of Gr(0) was observed at the melting point, and the range of the first-order transition temperature at heating was from 42.0 to 60.0 degrees C. At higher temperatures than the first-order transition temperature of each material, a considerable difference in Gr(0) values was observed. The transition temperatures obtained by the results of the Gr(0), specific volume and quantity of heat agreed with one another. A marked specific volume change was observed at the first-order transition temperature. The technique using melted gutta percha may not be favourable compared with the conventional lateral condensation technique because melted gutta percha undergoes a large amount of shrinkage during setting.
37 citations