Shahi Shahriar, Yavari Hamid R, Rahimi Saeed, Eskandarinezhad Mahsa, Shakouei Sahar, Unchi Mahsa
Department of Endodontics, Dental Faculty, Tabriz University (Medical Sciences), Tabriz, Iran.
J Oral Sci. 2011 Dec;53(4):517-22. doi: 10.2334/josnusd.53.517.
Inadequate apical seal is the major cause of surgical endodontic failure. The root-end filling material used should prevent egress of potential contaminants into periapical tissue. The purpose of this study was to compare the sealing ability of four root-end filling materials: white mineral trioxide aggregate (MTA), gray MTA, white Portland cement (PC) and gray PC by dye leakage test. Ninety-six human single-rooted teeth were instrumented, and obturated with gutta-percha. After resecting the apex, an apical cavity was prepared. The teeth were randomly divided into four experimental groups (A: white MTA, B: gray MTA, C: white PC and D: gray PC; n = 20) and two control groups (positive and negative control groups; n = 8). Root-end cavities in the experimental groups were filled with the experimental materials. The teeth were exposed to Indian ink for 72 hours. The extent of dye penetration was measured with a stereomicroscope at 16× magnification. The negative controls showed no dye penetration and dye penetration was seen in the entire root-end cavity of positive controls. However, there was no statistically significant difference among the four experimental groups (P > 0.05). All retrograde filling materials tested in this study showed the same microleakage in vitro. Given the low cost and apparently similar sealing ability of PC, PC could be considered as a substitute for MTA as a root-end filling material.
根尖封闭不完善是牙髓外科治疗失败的主要原因。所使用的根尖充填材料应防止潜在污染物进入根尖周组织。本研究的目的是通过染料渗漏试验比较四种根尖充填材料的封闭能力：白色三氧化矿物凝聚体（MTA）、灰色MTA、白色波特兰水泥（PC）和灰色PC。对96颗人单根牙进行预备，并使用牙胶进行充填。切除根尖后，制备根尖腔。将牙齿随机分为四个试验组（A：白色MTA，B：灰色MTA，C：白色PC，D：灰色PC；n = 20）和两个对照组（阳性和阴性对照组；n = 8）。试验组的根尖腔用试验材料充填。将牙齿浸泡在印度墨水中72小时。用体视显微镜在16倍放大倍数下测量染料渗透程度。阴性对照组未见染料渗透，阳性对照组的整个根尖腔均可见染料渗透。然而，四个试验组之间没有统计学上的显著差异（P > 0.05）。本研究中测试的所有倒充填材料在体外均表现出相同的微渗漏。鉴于PC成本低且封闭能力明显相似，PC可被视为MTA作为根尖充填材料的替代品。
