Manders C A, Garcia-Godoy F, Barnwell G M
University of Texas Health Science Center at San Antonio.
Am J Dent. 1990 Apr;3(2):63-6.
The purpose of this study was to evaluate the sealing ability of four cavity preparation treatment modalities under amalgam restorations. Class V cavity preparations were placed in 20 extracted teeth and randomly divided into four groups of five teeth each (10 restorations for each group): 1) no liner; 2) two applications of Copalite; 3) a base of IRM; and 4) a base of Chelon-Silver. After assigned cavity preparation treatment was accomplished, the teeth were restored with amalgam. The restored teeth were subjected to thermocycling and subsequently stained with basic fuchsin. The teeth were longitudinally sectioned and dye penetration recorded. Amalgam restorations with a Copalite or Chelon-Silver base exhibited significantly less microleakage than those amalgam restorations with an IRM base or no cavity preparation treatment. With the Copalite varnish, microleakage extended beyond the axial wall (toward the pulp chamber through the dentinal tubules) while with the Chelon-Silver base, microleakage was limited to the restoration-tooth interface.
本研究的目的是评估汞合金修复体下四种窝洞预备处理方式的封闭能力。在20颗离体牙上制备V类洞，并随机分为四组，每组5颗牙（每组10个修复体）：1）不使用垫底材料；2）涂两层科帕利特（Copalite）；3）用IRM垫底；4）用Chelon - Silver垫底。完成指定的窝洞预备处理后，用汞合金修复牙齿。对修复后的牙齿进行热循环处理，随后用碱性品红染色。将牙齿纵向切片并记录染料渗透情况。与用IRM垫底或未进行窝洞预备处理的汞合金修复体相比，用科帕利特或Chelon - Silver垫底的汞合金修复体表现出明显更少的微渗漏。使用科帕利特清漆时，微渗漏延伸至轴壁之外（通过牙本质小管朝向髓腔），而使用Chelon - Silver垫底时，微渗漏仅限于修复体与牙齿的界面。
