Analysis of the different mechanics used in closing spaces in the straight arch technique. 1st. Part

Abstract

Most of the challenges encountered in the management of the Straight
Wire Technique (although not the only ones) are related to controlling
sagittal movements during space closure in cases involving
extractions. Space closure can be achieved through two different
approaches: Opening and Loop Recovery Mechanics and Sliding Mechanics.
The Double Key Loop (DKL) enables the orthodontist to employ both
techniques, whereas the Post Arch is limited to the latter.

Every specialist must have precise knowledge of how to properly
utilize the various tools and resources available in the therapeutic
arsenal, including their variations, the optimal force values to
apply, and the ability to predict the expected biomechanical response.
They must also be aware of undesired movements generated during this
second phase of orthodontic treatment in the affected teeth or dental
groups. A lack of expertise in these areas can delay, alter, or even
prevent the achievement of the final treatment objectives.

The introduction of Skeletal Anchorage using interradicular
microimplants has been, without a doubt, the most significant
advancement in these mechanics. It minimizes undesirable (parasitic)
movements on the dental anchorage units, a persistent challenge with
"conventional" mechanics. While conventional space closure techniques,
such as the Post Arch or DKL, have been used for years with acceptable
results, they do not always guarantee a predictable biomechanical
response. This unpredictability often stems from the operator's lack
of knowledge or improper technique, although in some cases, it is
impossible to bypass Newton's Third Law (the principle of action and
reaction) inherent to all movements.

Skeletal anchorage provides a solution to this challenge, marking one
of the most significant advancements in orthodontics since Dr.
Lawrence F. Andrews introduced the pre-adjusted appliance. This makes
it a highly recommended tool to incorporate into clinical practice.