Iowa Section of AADR - The University of Iowa College of Dentistry

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M. Zhu 1 , H. Zhang 10 , Y. Ou 1 , J.A. Banas 1
1 University of Iowa; 10 University of Illinois at Chicago
Purpose:
compounds and extracts from 5 plant species for activity against the dental pathogen Streptococcus mutans.
Materials and methods: Compounds and extracts were tested in two separate assays.
S. mutans was inoculated into each well of 96-well plates that contained growth medium plus
development. A compound or extract was designated “growth inhibitory” if growth was not evident. The
of the stain was measured spectrophotometrically at 550nm.
S. mutans were generated and stained as described above,
effects.
Results: Of 1478 compounds and extracts tested, 285 inhibited growth. Another 259 compounds or extracts
Conclusion: The results indicate that compounds and extracts from a selection of Asian plants have potential as
35.
Gutta Percha From Moderately Curved Root Canals with ProTaper Retreatment Files
R. Beasley1 , A.E. Williamson1 , B.C. Justman1 , D.R. Drake1 , F. Qian1 1 University of Iowa
greater ease than other carrier-based systems. This in vitro
GuttaCore and two other common obturation materials from moderately curved canals. Mesial roots (n=60)
of mandibular molars were randomly divided into three groups with the same mean curvature and the mesiobuccal
canal was prepared to ISO size 30 with 0.04 taper. Group A (n=20) was obturated using a continuous-wave
GuttaCore, respectively, according to the manufacturers’ instructions. After allowing sealer to set, each specimen
working length. The time taken to reach working length and the time required for obturation material removal
Conclusion:
used, it was impossible to remove all traces of gutta percha and sealer from root canals utilizing this retreatment
technique.
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