Development Of Dentition And Occlusion
Question 1. Differentiate between Leeway space and Freeway space.
Or
Briefly differentiate between freeway space and Leeway space.
Answer.
Briefly differentiate between freeway space and Leeway space.
Answer.
Leeway Space
“Understanding the role of dentition and occlusion through Q&A”
The combine mesiodistal width of permanent canine and premolar is usually less than that of deciduous canines and molars. The surplus space is called as Leeway space of Nance.
- The amount of Leeway space is greater in mandibular arch than in maxillary arch.
- It is 1.8 mm in maxillary arch and 3.4 mm 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.
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Freeway Space
Freeway space is defied as gap existing between maxillary and mandibular teeth occlusal rims when mandible is in physiological rest position. The space is wedge shaped. It varies from to 2–4 mm.
Clinical Significance
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- It prevents fatigue of masticatory apparatus.
- It prevents clicking due to premature contacts of teeth.
- It prevents soreness of basal seat tissue.
- It prevents alveolar bone resorption.
- It prevents TMJ integrity.
- It helps in establishing proper phonation.
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