Girish Karri, Mandava Jyothi, Chandra R Ravi, Ravikumar K, Anwarullah Anupreeta, Athaluri Mounika
Department of Conservative Dentistry and Endodontics, GITAM Dental College, Visakhapatnam, Andhra Pradesh, India.
J Conserv Dent. 2017 Mar-Apr;20(2):115-119. doi: 10.4103/0972-0707.212238.
The aim of this study was to evaluate the fracture resistance of simulated immature teeth, when the root canals were completely filled either with mineral trioxide aggregate (MTA) or Biodentine, comparing with that of roots filled with apexification procedure.
Sixty mandibular premolar teeth with single, straight canals decoronated at cementoenamel junction were divided into five groups ( = 12 each). Group 1 samples served as negative control and remaining four groups root samples were shaped and cleaned using ProTaper rotary files. To simulate immature roots, a #5 Peeso reamer was passed beyond the apex so that apices were enlarged to a diameter of 1.5 mm. Group 2 and 4 samples were filled with 5 mm of MTA or Biodentine apical plug and backfilling with gutta-percha using AH Plus sealer. Group 3 and 5 root samples were completely obturated with MTA and Biodentine, respectively. All the teeth were loaded vertically until fracture, using the universal testing machine.
Forces at which fracture of the roots occurred were subjected to statistical analysis using SPSS/PC version 2 software, and the results were analyzed with the one-way analysis of variance and Newman-Keuls multiple test.
Complete root canal obturation with MTA or Biodentine has shown significantly higher fracture resistance ( < 0.05) when compared to apexification with MTA or Biodentine.
Obturation of the root canals with bioactive materials has shown highest fracture resistance when compared to apexification groups.
本研究的目的是评估模拟未成熟牙齿的抗折性，当根管分别用三氧化矿物凝聚体（MTA）或生物陶瓷充填时，与采用根尖诱导成形术充填的牙根进行比较。
60颗下颌前磨牙，牙根单根且根管笔直，在牙骨质牙釉质界处截冠，分为五组（每组n = 12）。第1组样本作为阴性对照，其余四组牙根样本使用ProTaper旋转锉进行预备和清理。为模拟未成熟牙根，用#5 Peeso扩孔钻超出根尖，使根尖扩大至直径1.5 mm。第2组和第4组样本用5 mm的MTA或生物陶瓷根尖充填，并用AH Plus封闭剂热牙胶充填根管。第3组和第5组牙根样本分别用MTA和生物陶瓷完全充填根管。所有牙齿使用万能试验机垂直加载直至折断。
牙根折断时的力使用SPSS/PC版2软件进行统计学分析，结果采用单因素方差分析和Newman-Keuls多重检验进行分析。
与用MTA或生物陶瓷进行根尖诱导成形术相比，用MTA或生物陶瓷完全充填根管显示出显著更高的抗折性（P < 0.05）。
与根尖诱导成形术组相比，用生物活性材料充填根管显示出最高的抗折性。
