The effects of post space preparation and post restoration on apical sealing ability / 华西口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the effects of post space preparation and post restoration on apical sealing ability.</p><p><b>METHODS</b>60 extracted mandibular premolars each with single canal were selected. All canals were prepared by manual ProTaper instrument using crown-down technique. The samples were the divided into 5 groups randomly. Group A 20 samples, the immediate post space preparation group; group B 20 samples, the delayed post space preparation group; group C 10 samples, the intact group; group D 5 samples, a positive control; group E 5 samples, a negative control. There were two subsets in groups A and B which were restored by temporary materials (A1 and B1) or fiber post and cores (A2 and B2). Indian ink dye method was used to measure the apical leakage in stereomicoscope.</p><p><b>RESULTS</b>The mean length of dye penetration for group A1, A2, B1, B2 and C were (0.52 +/- 0.47), (0.49 +/- 0.44), (1.17 +/- 0.77), (1.12 +/- 0.54), and (0.23 +/- 0.40) mm, respectively. Positive group demonstrated maximum dye penetration, and negative group showed no dye penetration. There was no statistically significant difference between group A1, A2 and group C (P>0.05). However, there were statistically significant differences between group B and group A, C (P<0.05). The length of dye penetration for group B was longer than that for group A and C.</p><p><b>CONCLUSION</b>The sealing ability was decreased after delayed post space preparation when using the AH-Plus sealer.</p>