Rehabilitation of weakened premolars with a new polyfiber post and adhesive materials.
BACKGROUND
Polyfiber posts used inside the root canal can help to restore the fracture resistance of weakened premolars.


OBJECTIVE
To assess the fracture resistance of endodontically treated premolars restored with different techniques, including the new polyfiber post (Spirapost).


METHODS
One hundred superior premolars were distributed into 10 groups (n = 10): Sound teeth (G1-positive control) and experimental (G2 to G10), which received MODP cavities and canal treatment. Groups were restored as follows: G2 - unrestored (negative control); G3 - microhybrid resin (MR); G4 - flowable resin (FR) + (MR); G5 - glass fiber post (Reforpost) + MR; G6 - Reforpost + FR + MR; G7 - polyethylene fiber (Ribbond) + MR; G8 - Ribbond + FR + MR; G9 - polyfiber post (Spirapost) + MR and G10 - Spirapost + FR + MR. After 24 h, the specimens were loaded until fracture. Data were analyzed by ANOVA and Tukey's test (P < 0.05).


RESULTS
Premolars restored with Spirapost (G9 and G10) provided the highest fracture strength (P < 0.05), similar to sound teeth (G1), regardless of the composite resin. Intermediate values were achieved by G3, G4, G5, G6, G7, and G8, which were similar (P > 0.05) and different from the others (P < 0.05). Inferior values were found in G2 (P < 0.05).


CONCLUSIONS
Fracture resistance of premolars with MODP cavities and endodontic access was recovered with the direct rehabilitation with Spirapost, regardless of the type of composite resin.
Marcia Rachel Costa
MR
Braga
Danielle Cristine
DC
Messias
Luciana Martins
LM
Macedo
Yara Correa
YC
Silva-Sousa
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Aline Evangelista Souza
AE
Gabriel
D001641:Bicuspid / Q000187:drug effects*; D003188:Composite Resins / Q000494:pharmacology; D003738:Dental Cements / Q000494:pharmacology*; D006801:Humans; D012387:Root Canal Filling Materials; D014082:Tooth Fractures / Q000517:prevention & control
D003188:Composite Resins; D003738:Dental Cements; D012387:Root Canal Filling Materials