• Bergoli, César Dalmolin

Abstract

<jats:title>SUMMARY</jats:title><jats:sec><jats:title>Purpose</jats:title><jats:p>To evaluate the fracture load and survival rate of weakened and non-weakened roots restored with different intracanal posts.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>Eighty teeth (16 mm) were prepared to a length of 10 mm with a custom drill. Fifty roots were weakened with a tapered diamond drill, and 30 roots were not. The specimens were embedded with acrylic resin up to 3 mm from the coronal aspect, and the periodontal ligament was simulated. The 50 weakened roots were restored with (n=10) CPC-gold (cast post and core made of gold alloy), CPC-Ni (cast post and core made of Ni-Cr alloy), FP (glass fiber posts), FP-W (glass fiber posts with a wider coronal diameter), and FP-CR (fiber posts relined with composite resin). The 30 nonweakened roots were restored with (n=10) CPC-gold, CPC-Ni, and FP. All of the posts were adhesively cemented. All of the specimens were mechanically cycled (37°C, 45°, 130 N, 2.2 Hz, and 1.5 million pulses) and evaluated after every 5 × 104 cycles to evaluate the presence of cracks as a primary outcome (event). The specimens that survived cycling were subjected to a fracture load test (load application on the palatal aspect at a 45° inclination). Failure mode was classified as favorable (above the simulated bone level) and catastrophic (below the simulated bone level). Survival rates were estimated using the Kaplan-Meier method. Fracture load data were analyzed using the Kruskal-Wallis test (α=0.05) for weakened roots, one-way analysis of variance, and Tukey test (p&amp;lt;0.05) for non-weakened roots, and Student t-test (p&amp;lt;0.05) compared nonweakened vs weakened roots for the same post system.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>For the preliminary survival results, FP-W showed a higher survival rate when compared with CPC (gold/Ni). For the fracture load (N), the statistical analysis (p&amp;lt;0.0001) presented differences among the weakened groups: CPC-gold (541.4) = CPC-Ni (642.6) &amp;gt; FP (282.2) = FP-W (274.1) = FP-RC (216.6). No differences were observed for the groups that were nonweakened (majority of favorable failures): CPC-gold (459.3) = CPC-Ni (422.0) = FP (347.9). Weakened roots restored with CPC-gold promoted high values of load fracture and unfavorable failure rates.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>Cast post and cores or fiber posts can be used for restoring nonweakened roots. However, for weakened roots, a fiber post with a wider cervical emerging diameter appears to be a better alternative when compared with cast post and cores.</jats:p></jats:sec>

Topics

• glass
• glass
• gold
• crack
• composite
• resin
• size-exclusion chromatography
• gold alloy