Abstract
OBJECTIVE: To evaluate the fracture strength of human premolar teeth with wide root canals, restored with glass fiber posts and resin cement, together with different numbers of accessory posts.MATERIAL AND METHOD: Thirty-six premolars received standardized preparations that simulated weakened roots, and were divided into three groups (n=12): G0 - glass fiber post (Reforpost/Angelus) cementation with dual cure resin cement (Rely X ARC/3M ESPE); G1 - glass fiber post cementation and one accessory post (Reforpin/Angelus), with dual cure resin cement; G2 - glass fiber post cementation and two accessory posts, with dual cure resin cement. Resin composite cores were placed in each tooth. A metal coping was placed in a standardized position on the cores to perform the compressive tests using a test machine. Testing was performed applying a force parallel to the long axis of the teeth at a speed of 0.5 mm/min. Fracture mode was analyzed under a stereoscopic loupe, classified by scores.RESULT: the Analysis of Variance (ANOVA) was applied, and there was no statistical difference in the mean values of fracture strength among the groups (in kgf): G0 = 91.1 ± 56.9; G1 = 104.7 ± 66.6; G2 = 106.1 ± 51.9. Greater frequency of fracture or cracks was observed in the cervical one-third of the root in the teeth without cemented accessory posts, but no statistical difference was observed among the fracture modes.CONCLUSION: The number of accessory posts cemented into debilitated roots had no influence on either fracture strength or type of fracture of pre-molar roots.
Highlights
For endodontically treated teeth that have lost a significant portion of coronal structure, it may be necessary to insert an intraradicular post to promote retention of the restoration
Resin composite may be placed within the root canal, applying it to the root canal walls to reduce its lumen before using an intraradicular post[8,9]; a custom-made post may be fabricated[10,11]; or a strip of glass fiber reinforcement with an adhesive system may be inserted into the canal[12,13]
Zogheib et al.[15] and Costa et al.[16] found no improvement in root strength, when comparing the use of fiber glass posts cemented with three accessory posts to other techniques of root reconstruction with intraradicular posts, even after mechanical cycling, no evaluations have been made in regard to the way in which the number of accessory posts inserted in the canal may influence fracture resistance
Summary
For endodontically treated teeth that have lost a significant portion of coronal structure, it may be necessary to insert an intraradicular post to promote retention of the restoration. There are advantages and limitations to every technique indicated, and must be duly evaluated[10] Another option is to use a glass fiber post cemented together with fiber glass accessory posts[14], making it possible to fill the existing space between the root canal and the glass fiber post. Zogheib et al.[15] and Costa et al.[16] found no improvement in root strength, when comparing the use of fiber glass posts cemented with three accessory posts to other techniques of root reconstruction with intraradicular posts, even after mechanical cycling, no evaluations have been made in regard to the way in which the number of accessory posts inserted in the canal may influence fracture resistance. The aim of this study was to evaluate the fracture strength of the weakened roots of human premolars, restored with glass fiber posts and resin cement cemented with different numbers of accessory posts. The null hypothesis to be tested was that there are no differences among fracture strength of weakened roots of human premolars restored with different numbers of accessory posts
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