INTRODUCTION: The reduced diameter of the mini-implants and the simplicity of the technique could minimize the operator mistake's possibility and avoid the contact between the thread of the screw and the dental root. In spite of that, it increases the fracture risk because of the diameter's decrease. METHODS: At the present work, mini-implants from five different trade marks, four Brazilian systems (INP, SIN, Conexão and Neodente) and a German system (Mondeal) were studied to identify important characteristics of this anchorage accessory, like composition, design and resistance to the insertion torque (in vitro). The values obtained from the mechanical torque test were submitted to variance analysis (ANOVA) and Tukey's test. RESULTS: All studied groups presented good results and are recommended to orthodontic clinic use.
Mini-implant; Skeletal anchorage
