The Role Of Leeway Space In Orthodontic Treatment Planning
Write short note on Leeway space.
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Write short note on Leeway space of Nance.
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Write short answer on Leeway space of Nance.
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Write short note on Leeway space and its importance.
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Write short note on Leeway space and its significance.
Answer.
Leeway Space of Nance
The combine mesiodistal width of permanent canine and premolar is usually less than that of deciduous canines and molars. The surplus space is called Leeway space of Nance.
- The amount of Leeway space is greater in mandibular arch than in maxillary arch.
- It is 1.8 mm (0.9 mm in each side of arch) in maxillary arch and 3.4 mm (1.7 mm in each side of arch) in mandibular arch.
- This excess space is available after exchange of deciduous molars and canines is utilized for mesial drift of mandibular molars to establish class I molar relationship.
Importance/Significance of Leeway Space
- Presence of excessive Leeway space is a favorable feature, which provides for the mesial movement of the permanent molars.
- Leeway space in the mandibular arch is more than that of the maxillary arch. This is because the primary mandibular molars are wider than the primary maxillary molars. The Leeway space diffrential between the two arches cause the mandibular fist molar to move mesially relatively more than the maxillary fist molar. Such an arrangement causes a change in the molar relationship from end on in the early mixed dentition period to class I relation at the late mixed dentition period (late mesial shift.
- Leeway space defiiency may be seen in some individuals when size of unerupted premolars and permanent canine are larger than the space available.
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