Goldman M, Simmonds S, Rush R
Department of Endodontics, School of Dental Medicine, Tufts University, Boston, MA 02111.
Oral Surg Oral Med Oral Pathol. 1989 Mar;67(3):327-32. doi: 10.1016/0030-4220(89)90365-4.
An in vitro study to determine the usefulness of dye-penetration studies was conducted. In part I, teeth were prepared through the foramen and then left open, either apically, coronally, or at both ends. In all cases, the dye did not penetrate the full length of the canal. The only exception was when both ends were left open and the teeth were placed into the dye in an upright position. In part II, a measurable defect in a canal filling the length of the canal was created and left open apically. When the tooth was immersed in dye, the penetration was incomplete. When the air was removed by vacuum pump prior to placement in the dye, the penetration was total. The validity of dye studies that do not consider entrapped air is open to question.
进行了一项体外研究以确定染料渗透研究的效用。在第一部分中，通过根尖孔制备牙齿，然后保持开放，开口可以在根尖、冠部或两端。在所有情况下，染料都没有渗透到根管的全长。唯一的例外是两端都保持开放且牙齿直立放置在染料中时。在第二部分中，在根管内制造了一个贯穿根管长度的可测量的缺损，并在根尖处保持开放。当牙齿浸入染料中时，渗透不完全。当在放入染料之前用真空泵去除空气时，渗透是完全的。不考虑 entrapped air（此处可能是“残留空气”之类意思，结合语境猜测）的染料研究的有效性值得怀疑。
