Baharav H, Laufer B Z, Langer Y, Cardash H S
Section of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, University of Tel Aviv, Israel.
Int J Prosthodont. 1997 May-Jun;10(3):248-53.
The authors investigated the length of time medicated displacement cord should remain in the gingival crevice prior to impression making. A silk cord (Deknatel) was placed into the sulcus and was not removed during the study. Medicated cords (Hemodent on Ultrapak #1) were placed into the gingival sulcus for 2, 4, 6, and 8 minutes. Following cord removal, closure of the sulcus was recorded at intervals using a miniature video camera. Crevicular widths were measured at the midbuccal and transitional line angle areas. At both the midbuccal and transitional line angle areas, gingival crevices displaced for 2 minutes were significantly smaller at 20 seconds (P < .05) than crevices following displacement for 4, 6, and 8 minutes. No significant difference in crevicular width was found at any time period after cord removal for crevices displaced for 4, 6, and 8 minutes. At the transitional line angle, crevicular widths were significantly smaller than at the midbuccal at 20 seconds for all times and remained so up to 180 seconds. To achieve a crevicular width of 0.2 mm, cord should remain in the gingival crevice for an optimum time of 4 minutes prior to impression making when using the materials evaluated in this study.
作者们研究了在制取印模前，含药排龈线应保留在龈沟内的时间。将一根丝线（Deknatel）放入龈沟内，在研究过程中不取出。将含药排龈线（Ultrapak #1上的Hemodent）分别放入龈沟2、4、6和8分钟。取出排龈线后，使用微型摄像机每隔一段时间记录龈沟的闭合情况。在颊侧中点和移行线角区域测量龈沟宽度。在颊侧中点和移行线角区域，排龈2分钟的龈沟在20秒时明显比排龈4、6和8分钟后的龈沟小（P <.05）。对于排龈4、6和8分钟的龈沟，在取出排龈线后的任何时间段，龈沟宽度均未发现显著差异。在移行线角处，所有时间点20秒时的龈沟宽度均明显小于颊侧中点处，并且一直保持到180秒。当使用本研究中评估的材料时，为了获得0.2mm的龈沟宽度，在制取印模前，排龈线应在龈沟内保留4分钟的最佳时间。
