PubMed · 8150190
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
J McSpadden. 1993. Multiphase gutta-percha obturation technique.. https://pubmed.ncbi.nlm.nih.gov/8150190/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
CLINICAL TECHNIQUE: It is generally accepted that the success of root-canal treatment is mainly dependent on the proper cleaning, shaping and hermetic obturation of root canals. Obturation of the root canal is of importance as 60% of endodontic failures are attributable to incomplete obliteration of the root-canal system. The clinical application of many obturation techniques used today demands the preservation of the natural apical construction or the preparation of an artificial equivalent during chemo-mechanical preparation. However, in clinical practice there are cases where the apical foramen is wide because of over-instrumentation, root-end resection during periradicular surgery, root resorption or because the apex of the root is incompletely formed. Thus the preparation of an artificial apical stop is very difficult to achieve. It is a common experience that performing usual gutta-percha condensation techniques in such canals often results in overfilling and therefore special obturation techniques are needed. Some clinical cases of teeth with wide apical foramen treated by a special obturation method are presented in this paper. In this method the end point of the primary gutta-percha cone is elasticized with a heated instrument and inserted into the root canal to record the internal morphology of the apical portion.
AIM: The aims of this study were firstly to compare the area of canal occupied by gutta-percha, sealer or voids using the System B heating device with that obtained by a modified vertical condensation technique using the Touch 'n Heat: and secondly to compare the temperature changes at the root canal wall and external root surface during obturation with the above techniques. METHODOLOGY: Forty-five resin blocks, each with a standardized, simulated, prepared main root canal and five lateral canals, were assigned to three equal experimental groups. The canals were obturated using either the System B technique at two different temperature settings, or vertical condensation with a Touch 'n Heat instrument as the heat source. A heat transfer model was used to simultaneously record internal and external root surface temperature elevations during obturation by the three techniques. Data were analysed using unpaired Student's t-test and Mann-Whitney U-test. RESULTS: Both obturation techniques produced root fillings consisting of over 90% gutta-percha at most levels, although the percentages of sealer and voids 2-3 mm from the working length following System B obturation were higher than those found following modified vertical condensation. Modified vertical condensation resulted in more gutta-percha in lateral canals. Obturation was accomplished more quickly using the System B, and temperature elevations produced during obturation with the System B were significantly less (P < 0.001) than with vertical condensation. An elevation of external root surface temperature by more than 10 degrees C occurred during vertical condensation. CONCLUSIONS: The results suggest that the System B may produce an acceptable obturation and that the use of a Touch 'n Heat source during vertical condensation may result in damage to the periodontium.
The balanced force concept proposes that instruments are guided by the canal structure when rotational motion is used. Changing the direction of rotation controls the probability that instruments will become overstressed and controls the cutting of structure to give an efficient result. Crown-down progression of the cleaning and shaping is possible as a result of predetermined preparations and use of a recent modified tip file design, the Flex-R file. Preparation time is minimized, while cleaning is enhanced by the crown-down approach. After cleaning and shaping, the intracanal aseptic state must be preserved by obturation. System B condensation followed by Inject-R Fill, back-filling is described as an efficient method to accomplish this obturation.