American Board of Orthodontics (ABO) Practice Exam

Question: 1 / 660

How much leeway space is recommended to be maintained according to LHA effects?

2.5mm

4.4mm

The recommended amount of leeway space to maintain according to the Localized Height of the Arch (LHA) effects is 4.4mm. This leeway space is critical in orthodontics because it represents the difference in space available for the permanent canines and premolars compared to the space occupied by the primary teeth.

Understanding leeway space is pivotal in guiding orthodontic treatment, particularly in the transition from primary to permanent dentition. The 4.4mm figure offers an optimal amount of space that can help accommodate the positioning of the permanent teeth effectively, reducing the chances of crowding and facilitating proper occlusion.

Maintaining the correct amount of leeway space ensures that the dental arch can develop harmoniously, allowing for proper alignment and function of the teeth as they erupt.

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6.0mm

3.2mm

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