Asli Hamid Neshandar, Saberi Bardia Vadiati, Fatemi Arezoo Sadat
Department of Prosthodontics, Guilan University of Medical Sciences, Rasht, Iran.
Department of Priodontics, Dental School, Guilan University of Medical Sciences, Rasht, Iran.
Indian J Dent Res. 2017 May-Jun;28(3):314-319. doi: 10.4103/ijdr.IJDR_459_16.
Use of chlorhexidine (CHX) gel to eliminate the malodor of implant cavity may decrease the friction coefficient and effective preload and result in abutment screw loosening. This study aimed to assess the effect of CHX gel on the preload, torque, and detorque values.
This in vitro experimental study was conducted on three groups of five implants. Group A (G1) was the control group and no material was applied to the implant cavity. In Group B (G2), implant cavity was filled with saliva before abutment screw tightening. In Group C (G3), implant cavity was first filled with saliva and then with CHX gel. The abutments were torqued to 24 N/cm2 according to the manufacturer's instructions and were then loosened. These processes were repeated five times. The ratio of the mean percentage of detorque to torque values was measured in all groups. The collected data were analyzed using ANOVA and post hoc Tukey's test.
No significant difference was noted between G1 and G2. Group G2 had significantly higher detorque value (p < 0.05). ANOVA detected a significant difference in the mean torque (p < 0.05) and detorque (p < 0.001) values among the three groups. G3 showed maximum difference between torque and detorque values; the minimum difference was noted in G2.
Application of CHX gel (to decrease the malodor of the implant cavity) decreases the detorque and preload values and increases the risk of screw loosening.
使用洗必泰（CHX）凝胶消除种植体腔的恶臭可能会降低摩擦系数和有效预紧力，并导致基台螺丝松动。本研究旨在评估CHX凝胶对预紧力、扭矩和拧松扭矩值的影响。
本体外实验研究对三组，每组五颗种植体进行。A组（G1）为对照组，种植体腔未施加任何材料。B组（G2）在拧紧基台螺丝前，种植体腔充满唾液。C组（G3）种植体腔先充满唾液，然后再充满CHX凝胶。根据制造商的说明，将基台扭矩拧至24 N/cm2，然后松开。这些过程重复五次。测量所有组中拧松扭矩与扭矩值的平均百分比比值。使用方差分析和事后 Tukey 检验对收集的数据进行分析。
G1和G2之间未观察到显著差异。G2组的拧松扭矩值显著更高（p < 0.05）。方差分析检测到三组之间的平均扭矩（p < 0.05）和拧松扭矩（p < 0.001）值存在显著差异。G3组扭矩和拧松扭矩值之间的差异最大；G2组差异最小。
应用CHX凝胶（以减少种植体腔的恶臭）会降低拧松扭矩和预紧力值，并增加螺丝松动的风险。
