Ansari Shuja Riaz, Qayyum Zahur, Khitab Umar
Department of Oral & Maxillofacial Surgery, Khyber College of Dentistry, Peshawar, Pakistan.
J Ayub Med Coll Abbottabad. 2003 Jul-Sep;15(3):43-6.
The objective of this study was to compare sealing capabilities of different filling materials when used as retrograde filling materials following apiceotomy (to check their sealing abilities as retro filling). In this study apical seal obtained following reverse retrograde root filling with amalgam, was compared with those obtained with, Glassinomer (GIC) and Zinc oxide eugonal (ZnO2E) cement.
The root canals of 50 extracted single rooted upper anterior human teeth were used in this study. The root canals were instrumented and obturated with laterally condensed, gutta-percha and zinc oxide sealer. Each tooth was a pically resected at 90 degrees to its long axis and the root surface isolated with two coats of nail polish. Teeth were divided into 4 groups, the 1st group received amalgam retrograde filling, the 2nd and 3rd group was retro filled with GIC and ZnO2E cement respectively and the 4th control group received no retrograde root filling. All these teeth were suspended in 1% methylene blue dye at room temperature for 72 hours, the roots were sectioned and dye penetration measured by using (stereomicroscope) microscope. The sealing abilities of these materials were determined by their ability to inhibit dye penetration.
The result of this study has shown that GIC is just as effective as amalgam but ZnO2E cement showed poor sealing abilities.
GIC is just as effective as Amalgam as a retro-sealer and on some instance, better then it, but a long term in vivo study is required to prove it.
本研究的目的是比较不同充填材料在根尖切除术后用作倒充填材料时的封闭能力（检查其作为倒充填的封闭能力）。在本研究中，将用银汞合金进行倒充填根管充填后获得的根尖封闭与用玻璃离子水门汀（GIC）和氧化锌丁香酚（ZnO2E）水门汀获得的根尖封闭进行比较。
本研究使用了50颗拔除的单根上前牙的根管。根管进行预备并用侧向加压法充填牙胶和氧化锌封闭剂。每颗牙齿均在与牙根长轴呈90度角处进行根尖切除，并用两层指甲油隔离牙根表面。牙齿分为4组，第1组接受银汞合金倒充填，第2组和第3组分别用GIC和ZnO2E水门汀进行倒充填，第4组为对照组，不进行倒充填根管充填。所有这些牙齿在室温下悬浮于1%亚甲蓝染料中72小时，然后将牙根切片，并用（体视显微镜）显微镜测量染料渗透情况。这些材料的封闭能力通过其抑制染料渗透的能力来确定。
本研究结果表明，GIC与银汞合金的效果一样，但ZnO2E水门汀的封闭能力较差。
GIC作为倒充填封闭剂与银汞合金效果一样，在某些情况下甚至更好，但需要进行长期的体内研究来证实这一点。
