Orthodontic Tools

Anterior Open Bite Closure Calculator

Estimates anterior open bite closure (A) from posterior molar intrusion (C) using the lever-arm relationship A = (C / d) × (b + d).

Inputs

Cephalometric measurements in millimeters.

Ar to Menton distance (b + d)

Total mandibular lever length, mm.

Ar to molar contact distance (d)

Fulcrum-to-molar arm, mm.

Posterior molar intrusion (C)

Planned intrusion at the molar, mm.

Results

Predicted geometric outcome.

Lever-arm ratio (b + d) / d

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Predicted anterior open bite closure (A)

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Clinical interpretation

Enter all three measurements. Ensure (b + d) > d and d > 0.