Parekh Bandish, Irani Rukshin S, Sathe Sucheta, Hegde Vivek
Department of Conservative Dentistry and Endodontics, Terna Dental College, Navi Mumbai, Maharashtra, India.
Department of Conservative Dentistry and Endodontics, M. A. Rangoonwala College of Dental Sciences and Research Centre, Pune, Maharashtra, India.
J Conserv Dent. 2014 May;17(3):234-7. doi: 10.4103/0972-0707.131783.
Microbial contamination of the pulp space is one of the major factors associated with endodontic failure. Thus, in addition to a three dimentional apical filling a coronal seal for root canal fillings has been recommended.
The present study was conducted to evaluate and compare the intra-orifice sealing ability of three experimental materials after obturation of the root canal system.
Fourty single rooted mandibular premolars were decoronated, cleaned, shaped and obturated. Gutta-percha was removed to the depth of 3.5 mm from the orifice with a heated plugger. Ten specimens each were sealed with Light Cure Glass Ionomer Cement (LCGIC), Flowable Composite (Tetric N-Flow), and Light Cure Glass Ionomer Cement with Flowable Composite in Sandwich Technique along with a positive control respectively and roots submerged in Rhodamine-B dye in vacuum for one week. Specimens were longitudinally sectioned and leakage measured using a 10X stereomicroscope and graded for depth of leakage.
According to the results of the present study LC GIC + Tetric N Flow demonstrated significantly better seal (P < 0.01) than LC GIC. However there was no statistically significant difference in leakage (P > 0.01) between Tetric N-Flow and LCGIC+Tetric N-Flow groups.
In the current study LCGIC+Tetric N-Flow was found to be superior over other experimental materials as intra-orifice barriers.
牙髓腔的微生物污染是导致根管治疗失败的主要因素之一。因此，除了进行三维根尖充填外，还建议对根管充填物进行冠部封闭。
本研究旨在评估和比较三种实验材料在根管系统充填后孔口内的封闭能力。
选取40颗单根下颌前磨牙，去除冠部，进行清理、预备和充填。用加热的充填器将牙胶从根管口去除至3.5mm深度。分别将10个样本用光固化玻璃离子水门汀（LCGIC）、流动树脂（Tetric N-Flow）、光固化玻璃离子水门汀与流动树脂三明治技术封闭，同时设置阳性对照组，将牙根置于罗丹明-B染料中，在真空中浸泡一周。将样本纵向切片，并使用10倍体视显微镜测量渗漏情况，并根据渗漏深度进行分级。
根据本研究结果，LC GIC + Tetric N Flow的封闭效果明显优于LC GIC（P < 0.01）。然而，Tetric N-Flow组与LCGIC+Tetric N-Flow组之间的渗漏情况无统计学差异（P > 0.01）。
在本研究中，发现LCGIC+Tetric N-Flow作为孔口内屏障优于其他实验材料。
