Lertchirakarn Veera, Timyam Araya, Messer Harold H
Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
J Endod. 2002 Mar;28(3):217-9. doi: 10.1097/00004770-200203000-00018.
The aim of this study was to compare vertical forces at fracture of endodontically treated mandibular incisors obturated with different types of root canal sealer. Four groups of 10 teeth each were tested; group 1 served as positive and negative controls (five teeth each), and groups 2, 3, and 4 were obturated by lateral condensation with gutta-percha and AH Plus, Tubliseal, or Ketac-Endo, respectively. All teeth were loaded vertically using a plugger tip inserted into the canal space until fracture occurred; the load at fracture and the pattern of fracture were recorded. Statistical analysis was performed using a one-way analysis of variance and post hoc Scheffé test at the 95% level of confidence. Force at fracture of roots obturated with Ketac-Endo was significantly higher than those obturated with AH Plus and Tubliseal. Most fracture lines were in a buccolingual direction. The results suggested that Ketac-Endo strengthens endodontically treated roots and may be used for weak roots, which are likely to be susceptible to vertical root fracture.
本研究的目的是比较用不同类型根管封闭剂充填的根管治疗下颌切牙折断时的垂直力。将四组牙齿，每组10颗进行测试；第1组作为阳性和阴性对照（每组各5颗牙），第2、3和4组分别用牙胶尖侧向加压充填并配合AH Plus、Tubliseal或Ketac-Endo封闭剂。所有牙齿均使用插入根管的充填器尖端垂直加载直至发生折断；记录折断时的负荷及折断模式。采用单因素方差分析和95%置信水平的事后Scheffé检验进行统计分析。用Ketac-Endo封闭的牙根折断时的力显著高于用AH Plus和Tubliseal封闭的牙根。大多数折裂线呈颊舌向。结果表明，Ketac-Endo可增强根管治疗后牙根的强度，可用于可能易发生垂直根折的薄弱牙根。
