Endodontically treated teeth are widely considered to be more susceptible to fracture than vital teeth. Obturation procedures and post placement have been a main cause of vertical root fracture. Forty-eight human premolars with standardized weakened roots were endodontically treated and allocated to four experimental groups (n=12). After root canal treatment, in group 1, fiber posts #1 were cemented in root canals using Estelite Core Quick, and the crowns were restored with resin composite. For group 2 and 3, the roots and crowns were restored using a light-cured and self-cured adhesive and resin composites respectively. In group 4, it was used the Panavia F 2.0 resin cement and resin composite for corono-radicular reconstruction. In group 5, the teeth remained untouched. After 24 hours storage and 1000 thermocycles, samples were loaded at a cross head speed of 1 mm per minute. A significant difference was observed in fracture resistance among groups 4 and 5 compared to other groups. Root reconstruction with fiber post and Panavia resin cement, and crown building using light-cured resin composite resulted in increased fracture resistance equal to that of intact teeth.
展开▼
机译:经牙髓治疗的牙齿被认为比重要牙齿更容易骨折。闭孔手术和后置放置一直是垂直根部骨折的主要原因。根管治疗了具有标准弱化根的四十八个人前磨牙,并将其分配到四个实验组(n = 12)。根管治疗后,在第1组中,使用Estelite Core Quick将1号纤维桩粘合在根管中,并用树脂复合材料修复冠。对于第2组和第3组,分别使用光固化和自固化的粘合剂和树脂复合材料修复牙根和牙冠。在第4组中,使用Panavia F 2.0树脂水泥和树脂复合材料进行冠状-根状重建。在第5组中,牙齿保持不变。储存24小时和1000次热循环后,以每分钟1毫米的十字头速度加载样品。与其他组相比,第4组和第5组之间的抗断裂性有显着差异。用纤维桩和Panavia树脂水泥进行牙根重建,并使用光固化树脂复合材料进行牙冠成形,可增加与完整牙齿相等的抗断裂性。
展开▼