Mechanical Properties of Mini-Implants Used in Extra-Radicular Anchorage

• Published in: Pesquisa brasileira em odontopediatria e clínica integrada 2023-01, Vol.23
• Main Authors: Lopes, Gabriela Barros, Pithon, Matheus Melo, Mordente, Carolina Morsani, Nojima, Lincoln Issamu, Horta, Martinho Campolina Rebello, Oliveira, Dauro Douglas, Soares, Rodrigo Vilamarim
• Format: Article
• Language: English
• Subjects: DENTISTRY, ORAL SURGERY & MEDICINE; Orthodontic Anchorage Procedures; Orthodontics; Stainless Steel; Titanium
• ISSN: 1519-0501; 1983-4632; 1983-4632
• DOI: 10.1590/pboci.2023.044

ABSTRACT Objective: To evaluate the mechanical properties of mini-implants (MIs) manufactured from stainless steel and compare them with conventional titanium-aluminum-vanadium alloy MIs. Material and Methods: The following groups were formed: G1 (n=24), 8×1.5 mm steel MIs; G2 (n=24), 12×2.0 mm steel MIs; and G3 (n=24), 10×1.5 mm titanium MIs. The 72 MIs were inserted in the infra zygomatic crest region of the maxilla and retromolar trigone in the jaw of 10 pigs. Pull-out, insertion torque, fracture and percussion tests were performed in order to measure the tensile strength, primary stability and fracture strength of MIs. A digital torque gauge was used to measure insertion and fracture torque, a universal mechanical testing machine was used for pull-out testing and a periotest device was used to measure the micromovement of MIs. For morphological and MI component evaluation, scanning electron microscopy (SEM) was performed. D'Agostino & Pearson, Kruskal-Wallis, and Dunn post-hoc and normality tests were used. Results: G2 insertion and fracture torques were significantly higher than G1 and G3 insertion and fracture torques (p