Ulusoy Özgür İlke, Paltun Yelda Nayır
Department of Endodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
J Dent Sci. 2017 Jun;12(2):121-125. doi: 10.1016/j.jds.2016.09.001. Epub 2016 Nov 10.
BACKGROUND/PURPOSE: Teeth with internal resorption are susceptible to fracture because of the remaining thin dentinal walls. The aim of this study was to investigate the fracture resistance of roots with simulated internal resorption cavities and obturated with different hybrid techniques.
Seventy single root canals were instrumented. On the coronal half of the roots, standardized internal cavities with a length of 8 mm were created. The apical 6 mm of the 60 root canals were filled with AH Plus sealer and gutta-percha cones. Then, 80 roots were divided into four experimental groups and two control groups according to the internal cavity obturation: Group 1, AHPlus sealer + high-temperature thermoplasticized injectable gutta-percha; Group 2, DiaRoot Bioaggregate; Group 3, Biodentine; Group 4, MTA Fillapex; Group 5, instrumented, but not obturated roots; Group 6, intact roots. A compressive vertical loading at a speed of 1 mm/min was applied to the roots. The forces when the fracture occurred were statistically analyzed with one-way analysis of variance and Tukey test.
Biodentine group showed statistically higher resistance to fracture than the other experimental groups (P < 0.05).
Filling the internal resorption cavities with thin dentinal walls using Biodentine may provide strength to the tooth structure more than the other calcium silicate-based materials.
背景/目的：由于剩余的牙本质壁较薄，发生内部吸收的牙齿易发生折断。本研究的目的是调查模拟内部吸收腔并用不同混合技术充填的牙根的抗折性能。
对70个单根管进行预备。在牙根的冠方一半处制备长度为8mm的标准化内部腔隙。60个根管的根尖6mm用AH Plus封闭剂和牙胶尖充填。然后，根据内部腔隙的充填情况将80个牙根分为四个试验组和两个对照组：第1组，AHPlus封闭剂+高温热塑注射型牙胶；第2组，DiaRoot生物聚合体；第3组，生物活性牙本质；第4组，MTA Fillapex；第5组，已预备但未充填的牙根；第6组，完整牙根。以1mm/min的速度对牙根施加垂直压缩载荷。对折断时的力进行单因素方差分析和Tukey检验的统计学分析。
生物活性牙本质组的抗折性能在统计学上高于其他试验组（P<0.05）。
与其他硅酸钙基材料相比，使用生物活性牙本质充填具有薄牙本质壁的内部吸收腔可能为牙齿结构提供更大的强度。
