Comparative Resistance of AH26 and a New Sealer Prototype to a Bacterial Challenge

Table 1

Color change and culture findings from lower chamber in AH26 Group.

Unit*	Color^¶	Day^†	Positive culture^‡	Leakage^§
1	Red	None	No	No
2	Yellow/orange	30	Yes	Yes^§
3	Yellow	9	Yes	Yes^§
4	Red	None	No	No
5	Yellow/orange	19	Yes	Yes^§
6	Orange	15	Yes	Yes^§
7	Red	None	No	No
8	Orange	25	No	No
9	Red	None	No	No
10	Yellow	4	Yes	Yes^§
11	Red	None	No	No
12	Red	None	No	No
13	Yellow	4	Yes	Yes^§
14	Red	None	No	No
15	Yellow	13	No	Yes^§
16	Orange	26	No	No
17	Orange	15	No	No
18	Red	None	No	No
19	Orange	30	No	No
20	Yellow	18	No	Yes^§

* Each unit consists of a dual-chamber model with an embedded root between the chambers.
^¶Color in the lower chamber after 30 days (Red: no change; yellow: acid; orange: weakly acidic).
^†Day when a color change was first observed in the lower chamber.
^‡Cultivable S. mutans from lower chamber sample after 30 days.
^§Evidence for bacterial penetration through root canal into lower chamber.