Abstract:

Objective

The aim of this study was to compare the coronal microleakage of casting nickel chromium alloy post and cores， bonded amalgam cores， conventional amalgam cores and fiber post reinforced composite resin cores on endodotically treated molars.

Methods

Sixty extracted human maxillary molars were endodontically treated and assigned to six groups randomly. Four groups were prepared for casting nickel chromium alloy post and cores， bonded amalgam cores， conventional amalgam cores and fiber post reinforced composite resin cores respectively. The other two groups served as positive control and negative control. The teeth were stored in India ink for 1 week. The coronal microleakage of ink penetration was assessed with a coded scoring system.

Results

The four experimental groups showed significantly less microleakage than the positive control （P ＜0.05）. The bonded amalgam cores and fiber post reinforced composite resin cores demonstrated significantly less microleakage than the casting nickel chromium alloy and conventional amalgam cores （P ＜0.05）.

Conclusion

All kinds of post and cores can reduce the microleakage of endodotically treated molars. Bonded amalgam and fiber post reinforced composite resin core are more preferable.

Key words: Amalgam core techniques, Fiber post reinforced composite resin core, Coronal microleakage