Soleimani Maryam, Żmudzki Jarosław, Pakieła Wojciech, Jaśkowska Anna, Krasny Kornel
Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, 18a Konarskiego Str., 41-100 Gliwice, Poland.
Doctoral School, Silesian University of Technology, 2A Akademicka Str., 44-100 Gliwice, Poland.
J Funct Biomater. 2024 Apr 9;15(4):96. doi: 10.3390/jfb15040096.
Re-tightening the loosened dental implant abutment screw is an accepted procedure, however the evidence that such screw will hold sufficiently is weak. The purpose of this study was material analysis of lost dental implant abutment screws made of the TiAlV alloy from various manufacturers, which became lost due to unscrewing or damaged when checking if unscrewed; undamaged screws could be safely re-tightened. Among 13 failed screws retrieved from 10 cases, 10 screws were removed due to untightening and 3 were broken but without mechanical damage at the threads. Advanced corrosion was found on nine screws after 2 years of working time on all surfaces, also not mechanically loaded. Sediments observed especially in the thread area did not affect the corrosion process because of no pit densification around sediments. Pitting corrosion visible in all long-used screws raises the question of whether the screws should be replaced after a certain period during service, even if they are well-tightened. This requires further research on the influence of the degree of corrosion on the loss of the load-bearing ability of the screw.
重新拧紧松动的牙种植体基台螺钉是一种被认可的操作，然而，这种螺钉能否充分固定的证据并不充分。本研究的目的是对不同制造商生产的由TiAlV合金制成的丢失牙种植体基台螺钉进行材料分析，这些螺钉因拧松或在检查是否拧松时损坏而丢失；未损坏的螺钉可以安全地重新拧紧。在从10例病例中取出的13颗失效螺钉中，10颗因拧松而被取出，3颗断裂但螺纹无机械损伤。在所有表面经过2年的工作时间后，在9颗螺钉上发现了严重腐蚀，且这些螺钉未承受机械载荷。特别是在螺纹区域观察到的沉积物并未影响腐蚀过程，因为沉积物周围没有点蚀致密化现象。在所有长期使用的螺钉中都可见点蚀腐蚀，这就提出了一个问题，即即使螺钉拧紧良好，在使用一定时间后是否应该更换。这需要进一步研究腐蚀程度对螺钉承载能力损失的影响。
