19725
document
[ Comparison of fracture resistance of pulpless teeth restored with fiber reinforced composite posts and three kinds of resin core material ] . OBJECTIVE To compare the fracture resistances of pulpless teeth restored with FRC ( Fiber Reinforced Composite ) posts and three kinds of resin core material . METHODS A total of 42 recently extracted upper incisors were randomly divided into 3 groups . Group A was restored with prefabricated glass-fiber posts and Artglass polymer core ; group B with prefabricated glass-fiber posts and Charisma composite resin core ; and group C with prefabricated glass-fiber posts and AB composite resin core . In every group , the core material was processed by hot-press and non hot-press respectively . The posts size and shape were identical in the 3 groups . All teeth were fully covered with polycarbonate resin crowns . Fracture resistance was measured by applying point force at 130 degrees to the long axis of the teeth on an universal testing machine . RESULTS Mean fracture threshold was 505.4 N +/- 42.0 N and 564.1 N +/- 41.7 N in group A , 411.3 N +/- 23.3 N and 315.3 N +/- 19.1 N in group B and 358.4 N +/- 36.1 N and 423.4 N +/- 47.5 N in group C. In all groups , there was no posts fracture and polycarbonate resin crowns fragmentation . CONCLUSION The composite restoration of FRC posts combined with resin core and resin crown can improve the fracture resistance of the pulpless roots . The strength of resin core material can be increased by hot-press methods .
19726
Intervention_Physical
pulpless teeth restored with fiber reinforced composite posts
19727
Intervention_Physical
FRC ( Fiber Reinforced Composite ) posts
19728
Intervention_Physical
three kinds of resin core material
19729
Intervention_Physical
prefabricated glass-fiber posts and Artglass polymer core
19730
Intervention_Physical
prefabricated glass-fiber posts and Charisma composite resin core
19731
Intervention_Physical
prefabricated glass-fiber posts and AB composite resin core
19732
Intervention_Physical
FRC posts combined with resin core and resin crown
19733
Intervention_Physical
hot-press methods
19734
Outcome_Physical
fracture resistance
19735
Outcome_Physical
fracture resistances
19736
Outcome_Physical
Fracture resistance
19737
Outcome_Physical
Mean fracture threshold
19738
Outcome_Physical
no posts fracture and polycarbonate resin crowns fragmentation
19739
Outcome_Physical
fracture resistance
19740
Participant_Sample-size
42