Escobar C, Michanowicz A E, Czonstkowsky M, Miklos F L
Oral Surg Oral Med Oral Pathol. 1986 May;61(5):504-7. doi: 10.1016/0030-4220(86)90395-6.
This study compared two different dental materials used in endodontic retrosealing procedures. One of these materials was a new low-temperature gutta-percha product, manufactured by the Hygenic Corporation, that involved an injection technique. The second of these materials was silver amalgam. Silver amalgam was selected because it has been recognized by many clinicians as the most effective apical sealing material. Two groups of ten recently extracted teeth were endodontically prepared with one of each of the materials being tested, and the effectiveness of these materials as sealants was determined by their ability to inhibit the penetration of methylene blue dye for a predetermined period of time through the apically sealed root tips. Preliminary results obtained indicated that, although these materials were not 100% effective in inhibiting the dye penetration, each was as effective as the other when evaluated by two observers following completion of the study as determined by its experimental design. No significant difference was exhibited between the amalgam group and the gutta-percha group. The leakage of the dye that was observed in each of the groups might have been caused by the ineffectiveness of, or the ineffective use of, the nail polish or cyanoacrylate used to coat all but the apically sealed tips of the endodonticalled prepared teeth. The function of these coating materials was to prevent penetration of the dye through the surface of the body of the root.(ABSTRACT TRUNCATED AT 250 WORDS)
本研究比较了用于牙髓倒充填术的两种不同牙科材料。其中一种材料是由卫生用品公司生产的新型低温牙胶产品，采用注射技术。另一种材料是银汞合金。选择银汞合金是因为它被许多临床医生认为是最有效的根尖封闭材料。两组各十颗近期拔除的牙齿分别用一种受试材料进行根管预备，通过在预定时间内抑制亚甲蓝染料透过根尖封闭的根尖来确定这些材料作为封闭剂的有效性。获得的初步结果表明，尽管这些材料在抑制染料渗透方面并非100%有效，但根据实验设计，在研究完成后由两名观察者评估时，每种材料的效果相同。银汞合金组和牙胶组之间未表现出显著差异。在每组中观察到的染料渗漏可能是由于用于涂覆除根管预备后根尖封闭端以外所有部位的指甲油或氰基丙烯酸酯无效或使用不当所致。这些涂层材料的作用是防止染料透过牙根体表面渗透。（摘要截短于250字）
