In vitro study was made of sealing effects of periodontal dressing materials (Septo-pack, COE-pak [Hard & Fast set]).
Glass tubes containing experimental materials were put in methylene blue solution (1.0%) at a definite temperature.
The results obtained were as follows:
1. Septo-pack and COE-pak [Hard & Fast set] showed good results in methylene blue solution test and sealing ability against water.
2. All in five cases of Septo-pack and COE-pak [Hard & Fast set] showed not a tendency to expansion.
