Influence of immediate or delayed post space preparation on the apical sealing ability of different root canal sealers

Lan Yu-yan; Huang Hai-xia; Fan Li-yuan; Pu Lin; Liu Min; Sun Li-bo

doi:10.3969/j.issn.2095-4344.2017.10.002

Abstract：BACKGROUND: Apical sealing ability is the key to ensure the long-term curative effect of root canal therapy. The post space preparation exposes some inevitable influence on root canal sealing ability, so how to minimize this effect becomes a hot spot.OBJECTIVE: To explore the effects of immediate or delayed post space preparation on the apical sealing ability of different root canal sealers.METHODS: Forty-eight extracted human premolar teeth were obtained, and the tooth crown was cut off. The samples were randomly divided into three groups (n=16 teeth per group). Group A underwent the immediate post space preparation; group B underwent the delayed post space preparation; group C without the post space preparation. Then all groups were subdivided into two groups, and then were filled with the gutta-percha/AH-Plus (groups A1, B1 and C 1)or the gutta-percha/mineral trioxide aggregate (groups A2, B2 and C2). The depth of apical dye penetration was measured using pressure-driven system. RESULTS AND CONCLUSION: There were no significant differences in the apical microleakage between groups A1 and B1, A2 and B2, C1 and C2 (P > 0.05). The apical microleakage in the group A1 was significantly higher than that in the group A2, and the group B1 also showed higher apical microleakage than the group B2 (P < 0.05). Our findings suggest that either immediate or delayed post space preparation exposes little influence on the apical microleakage after root canal filling with gutta-percha/mineral trioxide aggregate, which exhibits better apical sealing ability than the AH-plus.