Effects of Auxiliary Fiber Posts on Endodontically Treated Teeth With Flared Canals

Abstract

Macro-Lock post combined with auxiliary fiber posts could increase the fracture resistance of endodontically treated roots with over-flared canals. However, an effect of the auxiliary fibers on retention strength was not observed. SUMMARYThis study investigated the fracture resistance and retention of endodontically treated roots with over-flared canals restored with different post systems, including one cast metal post and four fiber posts with/without auxiliary fiber posts. One hundred endodontically treated incisor roots were experimentally flared using a tapered diamond bur. The roots were restored using one of the five post systems: Ni-Cr cast metal post (CM), D.T. Light glass fiber post (DT), Macro-Lock glass fiber post (ML), ML+2 Fibercone auxiliary fiber posts (2FC), and ML+5 Fibercone auxiliary fiber posts (5FC). After fabrication of the crowns, half of the specimens (n¼50) were subjected to a fracture failure test-loading with an incremental static force at an angle of 45 degrees to the long axis of the root. The other 50 samples underwent a pull-out test. Fracture failure strength and pull-out strength were measured and analyzed using one-way analysis of variance (ANOVA) followed by Tukey's post hoc test (a¼0.05). After the tests were completed, all specimens displayed oblique root fractures or cracks, initiating from the palatal cervical margin and propagating in a labial-apical direction. The order of the fracture failure strength was as follows: 5FC¼CM¼2FC. ML.DT. Cast metal posts demonstrated the highest pull-out strength (p,0.05). No significant differences in pull-out strength were found in the ML, 2FC, and 5FC groups. Within the limitations of this study, it was concluded

Fracture resistances of zirconia, cast Ni-Cr, and fiber-glass composite posts under all-ceramic crowns in endodontically treated premolars

“…Similar results were achieved in a previous study in which the fracture resistance of fiber glass was compared with cast gold posts for restoring endodontically treated premolars 22. In another study comparing fracture resistance of stainless-steel and fiber-glass posts in teeth restored with all-ceramic crowns, Li et al28 reported higher fracture resistance for fiber-glass posts.…”

Fracture resistance and stress distribution of simulated immature teeth after apexification with mineral trioxide aggregate

“…The use of an auxiliary fibre post (Li et al . ) or fibre post relining (Faria‐e‐Silva et al . , Macedo et al .…”

Assessment of Push Out Bond Strength and Cement Thickness for Oval Root Canals Restored with Different Post Techniques

“…These posts have gained their attractiveness due to many advantages: very good esthetic results, easy procedure, less clinical time, easy retrievability and preservation of the remaining tooth structure (5,6 ,7) . On the top of that is the main advantage of the glass fiber post which is the compatibility of its modulus of elasticity with that of the dentin, giving it a unique property that aids in protection of endodontically treated teeth from root fractures (7,8) . These posts are cemented to dentin with adhesive resin cements, thus allowing this assembly to become biomimicry, therefore more uniform stress distribution is allowed throughout the radicular dentin and less susceptibility to unrestorable fractures is reached (8,9) .…”

“…On the top of that is the main advantage of the glass fiber post which is the compatibility of its modulus of elasticity with that of the dentin, giving it a unique property that aids in protection of endodontically treated teeth from root fractures (7,8) . These posts are cemented to dentin with adhesive resin cements, thus allowing this assembly to become biomimicry, therefore more uniform stress distribution is allowed throughout the radicular dentin and less susceptibility to unrestorable fractures is reached (8,9) . Nevertheless, the drawback that was detected within the fiber posts is its circular cross section which render this treatment option to be perfect in cases of root canals with circular cross section only (9,10,11) .…”