Vol. 6, Issue 2, Part I (2020)

Materials and Methods: Twenty single rooted human mature were decoronated and accessed. Samples were divided into two groups depending on the time of post space preparation and method of post space preparation: (group A: warm vertical compaction/rotary preparation without solvent, group B: warm vertical compaction / rotary preparation with solvent). and divided the two groups to two halves: the first half was prepared post space after 24hours, and the other half a week later.

Results: There was no significant difference in penetration depth of mythelene blue dye within group A. However, significant difference in penetration depth of mythelene blue dye within group B. No significant difference was seen between post space preparation after one day and post space preparation after one week.

Conclusion: The different timing of post space preparation no effect on apical sealing of root canal. However, post space preparation after one week better than one day, when using rotary removal of gutta- percha with solvent.