Gehrcke Vanessa, de Oliviera Milene, Aarestrup Fernando, do Prado Maíra, de Lima Carolina Oliveira, Campos Celso Neiva
Department of Dental Clinic, Federal University of Juiz de Fora School of Dentistry, Juiz de Fora, MG, Brazil.
Department of Restorative Dentistry, Federal University of Juiz de Fora School of Dentistry, Juiz de Fora, Brazil.
Eur Endod J. 2017 Oct 2;2(1):1-5. doi: 10.14744/eej.2017.17009. eCollection 2017.
To evaluate the fracture resistance of different intra-radicular post systems in flared root canals.
Sixty human canines were used. The coronal portion was removed and the root length was standardized at 17 mm. Canals were prepared and filled with gutta-percha/AH Plus sealer. Roots were embedded in self-polymerising acrylic resin blocks. According to the material used, the teeth were randomly divided into three groups (n=20): glass fibre post (GFP): GFP and Z350 resin composite core; pre-fabricated metal post (PMP): PMP and Z350 resin composite core; and cast metal core (CMC): CMC with silver-tin alloy. Coronal reconstruction involved fabrication of metal copings. Samples were submitted to mechanical compression testing at 45º in a universal test machine. Fracture pattern was evaluated under a stereoscope. The fracture strength values were submitted to one-way analysis of variance (ANOVA) and Tukey tests (α=0.05).
There was no statistically significant difference between the resistance values among groups (P=0.193). With regard to fracture pattern, GFP showed 55% and PMP 45% of Type I fractures, which considered repairable or favourable, whereas MCC presented 50% of Type V, which was considered irreparable or unfavourable.
Glass fibre and pre-fabricated metal posts have good fracture resistance to compression and may be used for restoring flared root canals, since they presented fractures mainly involving the filling core, thus facilitating later repair.
评估不同根管内桩系统在扩大型根管中的抗折性能。
使用60颗人犬牙。去除冠部，将牙根长度标准化为17毫米。预备根管并充填牙胶尖/AH Plus封闭剂。将牙根埋入自凝丙烯酸树脂块中。根据使用的材料，将牙齿随机分为三组（n = 20）：玻璃纤维桩（GFP）：GFP和Z350树脂复合核；预成金属桩（PMP）：PMP和Z350树脂复合核；以及铸造金属核（CMC）：CMC与银锡合金。冠部重建包括制作金属顶盖。在万能试验机上对样本进行45°的机械压缩测试。在体视显微镜下评估骨折类型。将骨折强度值进行单因素方差分析（ANOVA）和Tukey检验（α = 0.05）。
各组之间的抗力值无统计学显著差异（P = 0.193）。关于骨折类型，GFP显示55%的I型骨折，PMP显示45%的I型骨折，I型骨折被认为是可修复的或有利的，而CMC显示50%的V型骨折，V型骨折被认为是不可修复的或不利的。
玻璃纤维桩和预成金属桩具有良好的抗压缩折性能，可用于修复扩大型根管，因为它们的骨折主要涉及充填核，便于后期修复。
