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Biomedical subjects

J R Kessler

Publications and source records attributed to J R Kessler.

5 recordsLinked to original sources
PubMed1995

A comparison of three different root canal sealers when used to obturate a moisture-contaminated root canal system.

Sealing ability of three classes of endodontic sealers, in moisture-contaminated canals, was evaluated. A total of 120 single-rooted extracted teeth were divided into three groups. The groups were obturated with either Procosol, Sealapex, or Ketac-Endo using saline as a moisture contaminant in all cases. Half (20 teeth) of each group was placed in a saline storage medium for 9 months. The remainder of the samples were placed in India ink, under a vacuum, cleared, and the amount of dye penetration measured under magnification. The stored samples were similarly treated after the 9-month storage period. In a moisture-contaminated canal, Procosol exhibited the least amount of apical leakage, followed by Sealapex, then Ketac-Endo. There was no significant difference in the amount of dye penetration after 9 months of storage over that found initially, which indicates that the deleterious effects of moisture contamination occur during the initial placement and setting reaction.

Analysis of Variance↗
PubMed1994

Apical seal of teeth obturated by the laterally condensed gutta-percha, the Thermafil plastic and Thermafil metal obturator techniques after post space preparation.

This in vitro study was conducted to determine the effect of post space preparation on teeth obturated with the Thermafil technique, both plastic and metal carriers, and the lateral condensation method. Three groups of 30 teeth each were obturated using the lateral condensation technique and the Thermafil plastic and metal techniques. Post space preparations were accomplished on the obturated groups. All specimens were submerged in India ink under a vacuum for 15 min and then soaked for an additional hour at atmospheric pressure. The teeth were decalcified and cleared to permit visualization and measurement of the extent of dye penetration. There was approximately three times more dye penetration in group 2 (plastic carrier) when compared with group 1 (lateral condensation) and group 3 (metal carrier). This was statistically significant at the 99% confidence level.

Analysis of Variance↗
PubMed1993

Effect of moisture on the apical seal of laterally condensed gutta-percha.

Eighty-five single-rooted human teeth were cleansed and shaped for obturation with gutta-percha and Proco-Sol root canal cement. Two of the three experimental groups had their canals contaminated with either 0.05 ml of NaOCl or saliva immediately prior to obturation. The remaining group of 25 teeth had dry canals prior to obturation. All teeth were obturated by the lateral condensation technique, covered with two coats of nail polish, immersed in India ink, and subjected to a vacuum for 15 min. The teeth were then cleared to allow visual assessment of the dye penetration through the apical seal. Positive and negative controls verified the experimental method. The recorded measurements were statistically analyzed and no significant differences were found among the groups.

Analysis of Variance↗