PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “ROOT CANAL OBTURATION”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 127 records · Page 7Linked to original sources
PubMed1990

Evaluation of temperature rise on the outer surface of teeth during root canal obturation techniques.

The heat generated at the apical 2 mm of the outer root surface of extracted human canine teeth during three obturation procedures was measured. The rise in temperature was found to be less when a sealer was used in all obturation techniques. Temperatures as high as 44.02 degrees C were recorded with warm gutta-percha with no sealer, and the lowest temperature rise occurred with a thermoplasticized gutta-percha technique with a sealer. The thickness of the remaining dentin and cementum after cleaning and shaping were found to have no effect in reducing temperature rise. The results of this investigation indicated that temperature rise on the outer surface of the root as a result of heat-generating obturation procedures is negligible and will not have an effect on the supporting attachment apparatus.

Bismuth↗
PubMed1992

A comparison of four root canal obturation methods employing gutta-percha: a computerized analysis of the internal structure.

The purpose of the present investigation was to compare the internal structure of gutta-percha for presence/absence of empty spaces when used in four different obturation methods: thermoplastic, chloroform-softened, thermomechanical, and warm lateral condensations. Each obturation was performed five times in a metal mold representing a root canal system. Following obturation the mold was disassembled and the gutta-percha was freeze-fractured at the 1.0, 3.5, and 6.5 mm levels as measured from the tip of the obturations. The fractured gutta-percha was placed in a scanning electron microscope, the image transferred to a computer, and converted to digital data. The results were subjected to statistical evaluation. The results demonstrated no difference between the obturation methods at the 1 mm level, however at the 3.5 mm level, thermomechanical condensation produced an internal structure characterized by a greater number of empty spaces (p < 0.0007). At the 6.5 mm level, thermomechanical condensation differed only from the chloroform-softened gutta-percha (p < 0.01).

Analysis of Variance↗
PubMed1992

Comparison of conventional root canal obturation techniques with Thermafil obturators.

This study compared microleakage of Thermafil Obturators to the single cone technique in Lexan blocks simulating root canals (n = 20) stained with Prussian blue dye. The microleakage of Thermafil and laterally condensed extracted human teeth was also investigated after the teeth were stained with India ink or Prussian blue dye over 1- or 2-wk dye immersion periods. In Lexan blocks there was no statistical difference in mean leakage between the single cone technique and Thermafil. Teeth with Thermafil Obturators exhibited greater leakage than those with the lateral condensation. Greater leakage was also seen where India ink was used. Dye immersion time did not have a significant influence on leakage scores. The combination of India ink with Thermafil demonstrated the greatest average leakage. This study demonstrated that Lexan canal simulating blocks do not mimic extracted human teeth for evaluating microleakage.

Coloring Agents↗
PubMed2002

Evaluation of apical leakage of root canals obturated with Nd: YAG laser-softened gutta-percha, System-B, and lateral condensation techniques.

In endodontics, a laser can be used as a heat source and gutta-percha can be softened by a laser and used in the root canals. The System-B endodontic heat source unit was designed for the obturation of the root canal system with a single continuous wave of thermoplasticized gutta-percha. The aim of this study was to compare the apical leakage of lateral condensation; Nd: YAG laser-softened gutta-percha and System-B techniques. Fifty-five extracted, single root human maxillary anterior and premolar teeth were used in this study. After working length determination, the "step-back technique" was used to prepare the root canals. The teeth were randomly divided into three experimental groups of 15 each and two control groups of 5 specimens each. The first group was obturated by lateral condensation, the second group by gutta-percha softened with an Nd: YAG laser, and the third group was obturated using the System-B technique. Apical leakage of the roots was evaluated by dye penetration using a stereomicroscope after sectioning the roots. The results of the first and third groups were similar, and the results of the second group showed differences when compared with the other groups. However, variance analysis revealed there was no statistically significant difference among the results.

Analysis of Variance↗
PubMedDate not supplied

Clinical evaluation of root canal obturation methods in primary teeth.

PURPOSE: This study evaluated in vivo 2 different obturation techniques (lentulo spiral mounted in a slow-speed handpiece and hand-held) in primary teeth. METHODS: The study was carried out on 24 children (mean age = 6.71 years) who had received 50 single-visit zinc oxide and eugenol (ZOE) pulpectomies in primary molars. The root canal filling materials were deposited into the canals either by a lentulo spiral mounted in a slow-speed handpiece or by a hand-held lentulo spiral. Evaluation of pulpectomized molars was performed by both authors immediately and 6 months following treatment using specific clinical and radiographic criteria. In cases of disagreement, the lower rank was selected. RESULTS: The study found 64% (16/25) optimal filling (if 1 or more of the canals having ZOE ended at the radiographic apex or up to 2 mm short of the apex) when the lentulo spiral mounted in the slow-speed handpiece was used. It also found a 96% (21/22) clinical success rate in the group obturated by the lentulo spiral mounted in a slow-speed handpiece vs 48% (12/25) optimal filling and a 92% (23/25) clinical success rate in the group obturated by a hand-held lentulo spiral. The radiographic success for over- and optimally filled canals, when combining both lentulo groups, was significantly greater than underfilled root canals (P = .009). CONCLUSIONS: There was no statistically significant difference between the 2 techniques of obturation, according to the quality of the root canal filling or success rate.

Child↗
PubMed2005

The imaging of root canal obturation using micro-CT.

AIM: To examine the potential and accuracy of micro-computed tomography (micro-CT) for imaging of filled root canals. METHODOLOGY: The root canals of five extracted maxillary teeth were shaped manually with K-files. After irrigation and drying, the root canals were filled by lateral condensation using gutta-percha cones and AH plus (Dentsply Maillefer, Ballaigues, Switzerland) as sealer. The filled root canals were examined by micro-CT at resolutions <11 microm. Three-dimensional reconstructions of the root canal fillings were made. The roots were sectioned histologically and standard photographs of the sectioned surfaces were taken. Digitized photographic images and the corresponding micro-CT sections were correlated qualitatively by superimposition. Quantitative morphometric data were obtained with respect to the surface area of the root canal filling and the individual gutta-percha points of the histological and the micro-CT sections. Pearson correlation coefficients were calculated. RESULTS: There was a good qualitative correlation between the images from the histological and the micro-CT sections. The fillings were clearly differentiated from the root canal walls. Individual gutta-percha cones and sealer were discernable. Pearson correlation coefficients showed a highly significant correlation between the two methods (P < 0.001) with respect to the area of the complete root canal filling (r = 0.992) and the gutta-percha cones (r = 0.968). CONCLUSIONS: The micro-CT technique was a highly accurate and nondestructive method for the evaluation of root canal fillings and its constituents. Qualitative and quantitative correlation between histological and micro-CT examination of root canal fillings was high.

Dental Pulp Cavity↗
PubMed1990

[Root canal obturation based on Sealapex calcium hydroxide. A clinical and radiological follow-up after 1 year].

To assess the efficiency of a calcium hydroxide containing root canal sealer (Sealapex), 227 obturated canals were examined clinically and radiologically after one year. When compared to a previously published study (Verdon & Holz 1988), the results show a decline of radiopacity within the canals and an almost complete resorption of the cement overfillings. It was also noted a slight improvement in the radiologic appearance of the periapical lesions.

Calcium Hydroxide↗
PubMed2005

Root surface temperature rises during root canal obturation, in vitro, by the continuous wave of condensation technique using System B HeatSource.

OBJECTIVES: This in vitro study evaluated increases in root surface temperature during the continuous wave of condensation technique using a System B HeatSource. STUDY DESIGN: Forty-five extracted human teeth (15 maxillary central incisors, 15 mandibular central incisors, and 15 maxillary canines) were used. After root canal cleaning and shaping, the teeth were filled with the continuous wave of condensation technique using a System B HeatSource. Temperature changes on the whole mesial and vestibular outer surfaces of the roots were measured using an infrared thermal imaging camera. RESULTS: The results of this in vitro study showed that the use of the continuous wave of condensation technique to fill the maxillary central incisors and maxillary canines produced temperature rises below the critical level. In the mandibular central incisors the use of a System B HeatSource resulted in elevation of the root surface temperature by more than 10 degrees C. CONCLUSION: The continuous wave of condensation technique using the System B HeatSource produces temperature changes on the outer root surfaces, which, in the case of teeth with relatively thin dentinal walls, can reach relatively high values.

Body Temperature↗