Effects of immediate and delayed intraradicular preparation on bond strength of fiber posts.
BACKGROUND
To assist the retention of restorations prepared in endodontically treated teeth, fiber posts are widely used in dental practice. The ideal time to prepare space for the post is still controversial.


OBJECTIVE
The purpose of this study was to evaluate the effects of immediate and delayed postspace preparation on the retention of the self-adhesive resin cement.


METHODS
Twelve bovine teeth were used with sectioned roots standardized to 19 mm. The teeth were properly instrumented and filled with gutta-percha and eugenol-free cement AH Plus. Two experimental groups (n = 6) were created based on the different times of post preparation (immediate and delayed). Using cemented cylindrical fiber posts, the teeth were put in acrylic resin and polyvinyl chloride tubes, where the cuts were made. Two slices were obtained from the cervical third, two from the medium third and two from the apical third. Subsequently, the samples were subjected into push-out tests. Statistical analysis were performed using ANOVA and Tukey's test (P = 5%).


RESULTS
The results indicated that, for all of the evaluated thirds, delayed preparation showed greater bond strength than immediate preparation.


CONCLUSIONS
A delayed post preparation of the root space, following the root canal filling, is recommended.
Marina Barbosa Mello
MB
Machado
Department of Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Luis Fernando Dos Santos
LF
Alves Morgan
Giovana Mongruel
GM
Gomes
Walison Arthuso
WA
Vasconcellos
Fabiano Pereira
FP
Cardoso
Rodrigo de Castro
Rde C
Albuquerque
D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D004708:Endodontics / Q000379:methods*; D006801:Humans; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000032:analysis*; D012387:Root Canal Filling Materials; D018915:Root Canal Preparation / Q000379:methods*
D019279:Resin Cements; D012387:Root Canal Filling Materials; C095998:Adhesive cement