Premature extraction or exfoliation of deciduous tooth results in space loss which causes malocclusion. Interception of space loss by using space regainer aids in prevention of malocclusion. This article highlights the use of modified lingual arch and nickel–titanium (Ni–Ti) open-coil spring in unilateral space regaining of mandibular arch. The Ni–Ti open-coil spring along with cross-arch stabilization is the mechanics used in this study for space gaining.
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