Pandey Chandrashekhar, Bhattarai Bishwa Prakash, Riddhabhaya Apiwat, Wongsirichat Natthamet, Rokaya Dinesh
Department of Clinical Dentistry, International College of Dentistry, Walailak University, Bangkok 10400, Thailand.
Department of Oral Biosciences, International College of Dentistry, Walailak University, Bangkok 10400, Thailand.
J Funct Biomater. 2022 Jun 21;13(3):85. doi: 10.3390/jfb13030085.
Little has been studied regarding the repeated usage of healing abutments and their effects on the distortion of dental implant-healing abutment hex surfaces. Additionally, implant manufacturers do not provide specific guidelines on how many times a healing abutment can be used before discarding. Therefore, we evaluated the effect of repeated screwing-unscrewing of implant-healing abutment on the healing abutment hex surface and screw head. A total of 12 Biomate implants with 4 mm diameter and 13 mm length were inserted into a synthetic bone block. The standard healing abutments of 3 mm diameter and 4 mm length were screwed onto each implant using a torque ratchet at a final torque of 30 Ncm. Immediately, the abutments were unscrewed at 30 Ncm. Then, screwing-unscrewing was repeated for 4, 8, 16, 24, 32, 40, 80, 160, 320, and 400 times and the healing abutments were scanned under the scanning electron microscope for any distortion. Distortion was graded as 0, 1, 2, and 3. Data were analyzed using SPSS 24.0. Descriptive statistics were calculated. One-way ANOVA with post hoc using Tukey’s HSD test was performed to analyze the difference in distortion at different screwing-unscrewing times. A significant level was selected at p-value = 0.05. It was found that distortion healing abutments screws were seen after 32 times screwing and unscrewing. There was a significant difference in the distortion (p-value < 0.05) after 24 times of repeated usage of healing abutment and at 160, 320, and 400 times. No surface distortions were observed at the healing abutment screw head at 4, 8, 16, 24, 32, 40, 80, 160, 320, and 400 cycles of screwing-unscrewing. It can be concluded that repeated screwing and unscrewing of the implant-healing abutments causes damage to the healing abutment hex surface. The distortion of healing abutments screws was seen after 32 times screwing and unscrewing. No surface distortions were observed on the healing abutment screw head until 400 times of screwing and unscrewing. Hence, the clinician should be cautious while using the healing abutments repeatedly.
关于愈合基台的重复使用及其对牙种植体-愈合基台六角形表面变形的影响，目前研究较少。此外，种植体制造商未提供关于愈合基台在丢弃前可使用次数的具体指导方针。因此，我们评估了种植体-愈合基台反复拧入-拧出对愈合基台六角形表面和螺钉头部的影响。将12颗直径4mm、长度13mm的Biomate种植体植入合成骨块中。使用扭矩扳手以30Ncm的最终扭矩将直径3mm、长度4mm的标准愈合基台拧到每个种植体上。然后，立即以30Ncm的扭矩拧下基台。接着，反复拧入-拧出4、8、16、24、32、40、80、160、320和400次，并在扫描电子显微镜下扫描愈合基台是否有任何变形。变形分为0、1、2和3级。使用SPSS 24.0分析数据。计算描述性统计量。采用单因素方差分析并使用Tukey's HSD检验进行事后分析，以分析不同拧入-拧出次数下变形的差异。选择p值=0.05作为显著水平。结果发现，在拧入和拧出32次后，愈合基台螺钉出现变形。在愈合基台重复使用24次后以及160、320和400次时，变形存在显著差异（p值<0.05）。在拧入-拧出4、8、16、24、32、40、80、160、320和400个循环时，愈合基台螺钉头部未观察到表面变形。可以得出结论，种植体-愈合基台的反复拧入和拧出会对愈合基台六角形表面造成损伤。在拧入和拧出32次后，愈合基台螺钉出现变形。在拧入和拧出400次之前，愈合基台螺钉头部未观察到表面变形。因此，临床医生在反复使用愈合基台时应谨慎。
