• Tippawan Inthararith D.D.S. (Hons)
• Piyanee Panitvisai D.D.S., M.D. Sc.(Endodontics), Thai Board of Endodontics

Objective To compare the dye leakage of retrograde filling technique using MTA and retrograde
filling technique using flowable resin composite with and without human blood contamination.

Materials and methods 68 extracted, single-rooted, single canal of upper anterior human teeth were
collected. The crowns were removed with low speed diamond saw to give 15 mm of root length.
All teeth were instrumented and obturated with gutta-percha and AH Plus root canal sealer.
Three millimeters of the root apex were resected. The samples were randomly divided into four
experimental groups (n=15) and two control groups (n=4). Two experimental groups were retroprepared
with ultrasonic to the depth of 3 mm and retrofilled with retrograde filling technique using MTA with
and without blood contamination. Another two experimental groups were retrofilled with retrograde
filling technique using flowable resin composite with and without blood contamination. The leakage of
dye was evaluated under vacuum. Two-way ANOVA was used to test for significant differences of the
leakage among the groups of specimens at the significant level of 0.05.

Results The group of retrograde filling technique using flowable resin composite without blood
contamination displayed significantly less leakage (p < 0.05) than all other groups.

Conclusion Leakage of retrofillings using MTA and flowable resin composite was affected by
retrograde filling techniques and blood contamination. The retrograde filling technique using
flowable resin composite without blood contamination displayed the least leakage.

(CU Dent J. 2009;32:167-78)