Leeway Space of Nance
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Leeway Space of Nance

Occlusion

Oral Anatomy

Leeway Space of Nance

The combine mesiodistal width of permanent canine and premolar is usually less that that of deciduous canines and molars. The surplus space is called as leeway space of Nance.

 

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  • The amount of leeway space is greater in mandibular arch than in the maxillay arch.
  • Maxilla: 0.9mm/segment = 1.8mm total [Textbook of Orthodontics By Gurkeerat Singh]

  • Mandible: 1.7mm/segment = 3.4mm total [Textbook of Orthodontics By Gurkeerat Singh]

  • 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.

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