Anchorage miniscrews: A surface characterization study using optical microscopy

Surface deterioration and elemental composition of retrieved orthodontic miniscrews

“…These tiny defects can be a starting point for electrochemical attack when miniscrews are inserted in the body. 17 Although titanium alloys are considered highly corrosion resistant because of the stable passive titanium oxide layer on the surface, they are not inert to corrosive attack. When the stable surface oxide layer breaks down or is removed and cannot reform on parts of the surface, titanium can be corrosive, as are many other base metals.…”

“…[13][14][15] On the other hand, we located 4 studies describing the surface and mechanical natures of retrieved orthodontic MSIs. 8,[16][17][18] Eliades et al 8 characterized the morphologic, structural, and compositional alterations, and assessed the changes in the hardness of orthodontic MSIs retrieved after successful service. They reported that used titanium-alloy MSIs have morphologic and surface structural alterations.…”

“…A statistically significant difference in the fracture torque was observed between the as-received and retrieved groups. Sebbar et al 17,18 assessed the surface changes in MSIs retrieved after usage and compared them with as-received MSIs under an optical microscope. Used MSIs showed signs of corrosion mainly at the sites of manufacturing defects.…”

Mini-implants for Orthodontic Anchorage: Surface Analysis after Redrilling and Sterilization – An in vitro Study

“…Immediate loading in the clinical setting could reduce osseointegration and lead to the soft tissues not enveloping the miniscrew surface. 20 Previous reports, however, did not present data of surface alterations after multiples insertions in the bone as well as possible damages caused by the autoclave process. Based on the above explanation, the main purpose of the present study was to investigate, in vitro, possible alterations on mini-implants surface after retrieval and if the cleaning process and sterilization can predispose damages.…”

Surface Properties and Maximum Insertion Energy of Sterilized Orthodontic Mini-Implants with Different Chemical Materials

“…The evaluation of the efficiency of ultrasonic, electrolytic and chemical cleaning procedures had been made in several studies [4][5][6], but in the Romanian literature, we found no study regarding the testing of the mechanical properties of the mini-implants after sterilization. Another important aspect studied in several papers [9][10][11][12][13][14][15][16] is the changes made by the sterilization and insertion procedures to the properties of temporary anchor devices. The studied properties were different, including the characteristics related to implants' stability (maximum insertion, removal torque) [9,[11][12][13], the mechanical characteristics (the fracture torque) [10,17 or the surface characteristics (roughness, topography) [14,15].…”