Comparison between aluminum chloride and tetryzoline hydrochloride for control of vertical gingival displacement and crevicular fluid

Abstract Introduction The use of a gingival displacement cord with a gingival displacement substance is a common procedure for taking a quality impression of the cervical terminal in teeth for prosthetic purposes. Objective To evaluate whether the mechanical-chemical method with 0.05% tetryzoline hydrochloride or 25% aluminum chloride is capable of reducing crevicular fluid, and displacing a statistically significant larger quantity of gingival tissue vertically, compared with the mechanical method (without chemical substances). Material and method Ten patients were selected, and then No. 000 and 1 Ultrapak cords were randomly positioned on teeth 13, 21 and 23. Group I – cord with no chemical substance; Group II – cords impregnated with tetryzoline hydrochloride and Group III – cords impregnated with aluminum chloride. Using dental stone models, thirty images were captured with a camera coupled to a loupe to analyze the degree of gingival displacement. Crevicular fluid was quantified using a high-precision scale and individualized strips of absorbent paper for each tooth on which gingival displacement was performed. Result There was no statistical difference between the three groups relative to the amount of vertical gingival displacement (Anova, p=0.26). As regards reduction in crevicular fluid, there was no difference between the test and control groups (Wilcoxon and Friedman, p < 0.05). Conclusion The use of tetryzoline hydrochloride or aluminum chloride to impregnate the gingival displacement cord did not improve the quantity of vertical gingival displacement and did not reduce the amount of crevicular fluid.

摘要 引言
为获取用于修复治疗的牙齿颈缘高质量印模，使用带有排龈材料的牙龈排龈线（gingival displacement cord）是临床常见操作。
目的 相较于单纯机械方法（未添加化学制剂），评估采用0.05%盐酸四氢唑啉（tetryzoline hydrochloride）或25%氯化铝的机械-化学方法，是否能够减少龈沟液（crevicular fluid），并实现统计学意义上更显著的牙龈组织垂直移位。
材料与方法 选取10例患者，将000号与1号Ultrapak排龈线随机放置于13、21、23号牙位。分为三组：I组：不含化学制剂的排龈线；II组：浸有盐酸四氢唑啉的排龈线；III组：浸有氯化铝的排龈线。通过连接放大镜的相机拍摄牙科石膏模型的30幅图像，以分析牙龈移位程度。采用高精度天平结合针对每颗接受排龈处理牙齿的专用吸水纸条，对龈沟液进行定量检测。
结果 三组间垂直牙龈移位量无统计学差异（方差分析Anova，p=0.26）。在龈沟液减少效果方面，试验组与对照组间未观察到显著差异（Wilcoxon检验与Friedman检验，p<0.05）。
结论 采用盐酸四氢唑啉或氯化铝浸渍牙龈排龈线，既未提升垂直牙龈移位量，也未减少龈沟液分泌量。