In orthodontic practice, effective space closure requires a solid understanding of the underlying biomechanics in order to avoid adverse effects. There are many variables that can condition the success of the treatment, factors such as anchorage, metal alloy, appliance design or the mechanics used are decisive. There are two types of methodology: mechanical with friction, or sliding, and mechanical without friction, which incorporates the use of springs in the archwire. The former stands out for its simple execution, while the latter, despite requiring greater skill in execution, provides control of the moment/force ratio, facilitating translation tooth movement, and a good force/deflection ratio, allowing for a lighter and more constant release of force.

The purpose of this conference is to discuss some therapeutic alternatives, illustrating them with clinical cases.

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