Espinar-Escalona Eduardo, Bravo-Gonzalez Luis-Alberto, Pegueroles Marta, Gil Francisco Javier
Department of Stomatology, School of Dentistry, University of Seville, C/Avicena s/n, 41009, Seville, Spain.
Teaching Unit of Orthodontics, School of Dentistry, University of Murcia, Hospital Morales Meseguer, 2nd floor, Avda. Marqués de los Vélez s/n, 30008, Murcia, Spain.
Clin Oral Investig. 2016 Jun;20(5):1115-20. doi: 10.1007/s00784-016-1770-y. Epub 2016 Mar 9.
Self-drilling orthodontic mini-implants can be used as temporary devices for orthodontic treatments. Our main goal was to evaluate surface characteristics, roughness and wettability, of surface modified mini-implants to increase their stability during orthodontic treatment without inducing bone fracture and tissue destruction during unscrewing.
Modified mini-implants by acid etching, grit-blasting and its combination were implanted in 20 New Zealand rabbits during 10 weeks. After that, the bone-to-implant (BIC) parameter was determined and the torque during unscrewing was measured. The surface characteristics, roughness and wettability, were also measured, onto modified Ti c.p. discs.
Acid-etched mini-implants (R a ≈ 1.7 μm, contact angle (CA) ≈ 66°) significantly improved the bone-to-implant parameter, 26 %, compared to as-machined mini-implants (R a ≈ 0.3 μm, CA ≈ 68°, BIC = 19 %) due to its roughness. Moreover, this surface treatment did not modify torque during unscrewing due to their statistically similar wettability (p > 0.05). Surface treatments with higher roughness and hydrophobicity (R a ≈ 4.5 μm, CA ≈ 74°) lead to a greater BIC and to a higher removal torque during unscrewing, causing bone fracture, compared to as-machined mini-implants.
Based on these in vivo findings, we conclude that acid-etching surface treatment can support temporary anchoring of titanium mini-implants.
This treatment represents a step forward in the direction of reducing the time prior to mini-implant loading by increasing their stability during orthodontic treatment, without inducing bone fracture and tissue destruction during unscrewing.
自攻型正畸微型种植体可作为正畸治疗的临时装置。我们的主要目标是评估表面改性微型种植体的表面特性、粗糙度和润湿性，以提高其在正畸治疗期间的稳定性，同时在拧松过程中不引起骨折和组织破坏。
通过酸蚀、喷砂及其组合对微型种植体进行改性，并将其植入20只新西兰兔体内，为期10周。之后，测定骨与种植体（BIC）参数，并测量拧松过程中的扭矩。还对改性纯钛圆盘的表面特性、粗糙度和润湿性进行了测量。
与加工后的微型种植体（R a≈0.3μm，接触角（CA）≈68°，BIC=19%）相比，酸蚀微型种植体（R a≈1.7μm，CA≈66°）因其粗糙度显著提高了骨与种植体参数，提高了26%。此外，由于其润湿性在统计学上相似（p>0.05），这种表面处理在拧松过程中不会改变扭矩。与加工后的微型种植体相比，具有更高粗糙度和疏水性（R a≈4.5μm，CA≈74°）的表面处理导致更大的BIC和拧松过程中更高的去除扭矩，从而导致骨折。
基于这些体内研究结果，我们得出结论，酸蚀表面处理可以支持钛微型种植体的临时锚固。
这种治疗方法在减少微型种植体加载前的时间方面向前迈进了一步，通过提高其在正畸治疗期间的稳定性，同时在拧松过程中不引起骨折和组织破坏。
