Aim: To discuss the modus operandi of Planas Direct Tracks and the components of crossbites
—anterior, posterior, buccal, unilateral or bilateral. Discussion: Modification of
mandibular posture is a common finding, especially in unilateral and anterior crossbites,
associated with deep bite. Frequently, there will be a modification in condylar position
related to the mandibular deviation from the midsagittal plane. In such cases, there are
almost always modifications in the activity of the muscles of mastication, lips, cheek, supraand
infrahyoid, etc. Mastication tends to be more frequent on the crossbite side. There are
also important modifications on the occlusal plane. These aspects—dental, skeletal, neuromuscular
—and the temporomandibular joint, mastication, and other functions are discussed.
Conclusion: Use of Planas Direct Tracks is an excellent treatment modality for crossbites
—anterior, posterior, buccal, unilateral or bilateral—in deciduous and early mixed
dentition, which applies natural forces (including growth, dental eruption, mandibular and
lingual posture and movements) to normalize the dental relationship and the other components
involved. World J Orthod 2002;3:239–249.