The attachment and morphologyof human periodontal ligament fibroblasts to mineral trioxide aggregate (MTA) was evaluated using a scanning electron microscope. The material was placed at an apical cavity of 30 single-rooted slices of extracted human teeth. The specimens were divided into two groups of 15 root slices each (freshly mixed and set state). For each experimental group, five root slices were used per observation period (4, 8, and 24 h). A set of two glass slides was used per observation period for the control group.

The aim of this study was to evaluate the integrity of the coronal seal of Temp-Bond and compare it to

Cavit and IRM after post space preparation using S. faecalis as a microbial tracer. In addition, the affect

of two methods of gutta percha removal on the apical seal of root canal fillings was also evaluated. Forty

extracted human single rooted teeth were prepared chemomechanically and obturated with gutta percha and

AH26 sealer cement using the lateral cold condensation technique to a standardized working length of 15