Vivan Rodrigo Ricci, Guerreiro-Tanomaru Juliane Maria, Bosso-Martelo Roberta, Costa Bernardo Cesar, Duarte Marco Antonio Hungaro, Tanomaru-Filho Mário
Department of Dentistry, Bauru Dental School, USP - Universidade de São Paulo, Bauru, SP, Brazil, Universidade de São Paulo, Department of Dentistry, Bauru Dental School, Universidade de São Paulo, Bauru SP , Brazil.
Department of Restorative Dentistry, Araraquara Dental School, UNESP - Universidade Estadual Paulista, Araraquara, SP, Brazil, Universidade Estadual Paulista, Department of Restorative Dentistry, Araraquara Dental School, Universidade Estadual Paulista, Araraquara SP , Brazil.
Braz Dent J. 2016 May-Jun;27(3):332-5. doi: 10.1590/0103-6440201600340.
The aim of this study was to evaluate the bond strength of root-end filling materials. Forty 2-mm-thick slices were obtained from human single-rooted teeth. After root canal preparation using a 1.5 mm diameter cylindrical drill, the dentinal walls were prepared by diamond ultrasonic tip (CVD T0F-2). The specimens were divided according the material (n=10): MTA Angelus (MTAA), MTA Sealer (MTAS, experimental), Sealer 26 (S26) and zinc oxide and eugenol cement (ZOE). The push-out test was performed in a mechanical test machine (EMIC DL 2000) at 1 mm/min speed. The failure type was evaluated by stereomicroscopy. The results were subjected to ANOVA and Tukey test, at 5% significance level. MTAA (19.18 MPa), MTAS (19.13 MPa) and S26 (15.91 MPa) showed higher bond strength (p<0.05). ZOE (9.50 MPa) showed the least bond strength values (p<0.05). Adhesive failure was prevalent in all groups, except for ZOE, which showed mixed failures. It was concluded that root-end filling materials MTA Angelus, MTA Sealer and Sealer 26 showed higher bond strength to dentinal walls than zinc oxide and eugenol cement after retrograde preparation.
本研究的目的是评估根尖充填材料的粘结强度。从人类单根牙获取了40个2毫米厚的切片。使用直径1.5毫米的圆柱形钻头进行根管预备后，用金刚石超声尖（CVD T0F - 2）制备牙本质壁。根据材料将标本分为4组（每组n = 10）：MTA Angelus（MTAA）、MTA封闭剂（MTAS，实验用）、封闭剂26（S26）和氧化锌丁香酚水门汀（ZOE）。在机械试验机（EMIC DL 2000）上以1毫米/分钟的速度进行推出试验。通过体视显微镜评估失败类型。结果进行方差分析和Tukey检验，显著性水平为5%。MTAA（19.18兆帕）、MTAS（19.13兆帕）和S26（15.91兆帕）显示出较高的粘结强度（p < 0.05）。ZOE（9.50兆帕）显示出最低的粘结强度值（p < 0.05）。除ZOE显示混合失败外，所有组均以粘结失败为主。得出的结论是，在进行倒充填预备后，根尖充填材料MTA Angelus、MTA封闭剂和封闭剂26对牙本质壁的粘结强度高于氧化锌丁香酚水门汀。
