PDF(Pubmed)
Abstract：
Implantoplasty is a technique increasingly used to remove the biofilm that causes peri-implantitis on dental implants. This technique of mechanization of the titanium surface makes it possible to eliminate bacterial colonies, but it can generate variations in the properties of the implant. These variations, especially those in fatigue resistance and electrochemical corrosion behavior, have not been studied much. In this work, fatigue tests were performed on 60 dental implants without implantoplasty, namely 30 in air and 30 in Hank\'s solution at 37 °C, and 60 with implatoplasty, namely 30 in air and 30 in Hank\'s solution at 37 °C, using triaxial tension-compression and torsion stresses simulating human chewing. Mechanical tests were performed with a Bionix servo-hydraulic testing machine and fracture surfaces were studied by scanning electron microcopyElectrochemical corrosion tests were performed on 20 dental implants to determine the corrosion potentials and corrosion intensity for control implants and implantoplasty implants. Studies of titanium ion release to the physiological medium were carried out for each type of dental implants by Inductively Coupled-Plasma Mass Spectrometry at different immersion times at 37 °C. The results show a loss of fatigue caused by the implantoplasty of 30%, observing that the nucleation points of the cracks are in the areas of high deformation in the areas of the implant neck where the mechanization produced in the treatment of the implantoplasty causes an exaltation of fatigue cracks. It has been observed that tests performed in Hank\'s solution reduce the fatigue life due to the incorporation of hydrogen in the titanium causing the formation of hydrides that embrittle the dental implant. Likewise, the implantoplasty causes a reduction of the corrosion resistance with some pitting on the machined surface. Ion release analyses are slightly higher in the implantoplasted samples but do not show statistically significant differences. It has been observed that the physiological environment reduces the fatigue life of the implants due to the penetration of hydrogen into the titanium forming titanium hydrides which embrittle the implant. These results should be taken into account by clinicians to determine the convenience of performing a treatment such as implantoplasty that reduces the mechanical behavior and increases the chemical degradation of the titanium dental implant.
摘要：
植入物成形术是一种越来越多地用于去除在牙科植入物上引起植入物周围炎的生物膜的技术。这种钛表面机械化技术可以消除细菌菌落，但是它可以产生植入物特性的变化。这些变化，特别是那些在抗疲劳和电化学腐蚀行为，研究不多。在这项工作中,对60个没有植入成形术的牙种植体进行了疲劳测试，即空气中30℃和汉克溶液中30℃，37℃，60例进行了植入术，即空气中30℃和汉克溶液中30℃，37℃，使用三轴拉伸-压缩和扭转应力模拟人类咀嚼。使用Bionix伺服液压试验机进行机械测试，并通过扫描电子微复制研究断裂表面。对20个牙科植入物进行电化学腐蚀测试，以确定对照植入物和植入成形术植入物的腐蚀电位和腐蚀强度。通过电感耦合等离子体质谱法在37°C的不同浸没时间下对每种类型的牙科植入物进行钛离子向生理介质释放的研究。结果表明，由植入成形术引起的疲劳损失为30％，观察到裂纹的成核点位于植入物颈部区域的高变形区域，在该区域中，在植入成形术的治疗中产生的机械化导致疲劳裂纹的提高。已经观察到，在Hank's溶液中进行的测试降低了疲劳寿命，这是由于在钛中掺入氢导致形成氢化物，从而使牙种植体脆化。同样，植入成形术会导致耐腐蚀性降低，并在加工表面上出现点蚀。离子释放分析在植入的样品中稍高，但未显示统计学上的显着差异。已经观察到,由于氢渗透到钛中形成使植入物脆化的氢化钛,生理环境降低了植入物的疲劳寿命。临床医生应考虑这些结果，以确定进行诸如植入成形术的治疗的便利性，该治疗可降低钛牙植入物的机械行为并增加其化学降解。
