Biomedical subjects

F R Portell

Publications and source records attributed to F R Portell.

8 recordsLinked to original sources

PubMed1989

A comparison of apical seal: chloroform versus eucalyptol-dipped gutta-percha obturation.

Three groups of extracted teeth were obturated using gutta-percha and lateral condensation. In one group the gutta-percha was dipped in chloroform before condensation. In a second a eucalyptol dip was used. No dip was used in the third group. A dye penetration study was done to compare leakage among the three groups. The teeth were cleared for viewing and measurements of dye penetration were made using a stereomicroscope. Statistical analysis using Kruskal-Wallis one-way analysis of variance of the results showed no significant difference among test groups at the 0.05 level.

Chloroform↗

PubMed1989

Does cold burnishing gutta-percha create a better apical seal?

This study investigated the seal created by cold burnishing the gutta-percha exposed after apical root resection of endodontically treated teeth. Sixty single-rooted extracted human teeth with a single straight canal were divided into four experimental groups of 15 teeth each. In two of the experimental groups the canals were instrumented and obturated well with laterally condensed gutta-percha and sealer. The remaining two groups were instrumented and poorly obturated with laterally condensed gutta-percha and sealer. The apical 2 mm of all the teeth were then resected and the effect of cold burnishing the exposed gutta-percha was investigated using a linear dye penetration technique. Under the condition of this study, cold burnishing gutta-percha after apical root resection of a well-obturated root canal resulted in a poorer apical seal than if no burnishing were performed. Cold burnishing the exposed gutta-percha after apical root resection of poorly obturated root canals improved the apical seal as compared with nonburnished poorly obturated canals.

Dental Leakage↗

PubMed1989

Leakage in vitro with IRM, high copper amalgam, and EBA cement as retrofilling materials.

An in vitro dye leakage study was performed to compare the sealing ability of high copper amalgam with Copalite, IRM, and EBA cement when used as retrofilling materials. Fifty-one extracted anterior teeth were instrumented and then obturated with gutta-percha. The apical 3 mm of the roots were resected and 2-mm deep apical preparations were made. The roots were then randomly placed into three groups and retrofilled with one of the experimental materials. After 72 h in India ink, the teeth were cleared and evaluated for leakage with a stereomicroscope. No leakage was evident in the three teeth used as negative controls and complete leakage was noted in the three positive control teeth. Statistical analysis showed that IRM and EBA cement had significantly less leakage than amalgam with Copalite. The difference between the EBA cement and IRM was not significant.

Copper↗

PubMed1988