SBO-DO Discrepancy Index

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Part 1: The Questions

OVERJETSee instruction

Negative Overjet (x-bite): Total sum of (mm × teeth)

OVERBITESee instruction

ANTERIOR OPEN BITESee instruction

0 mm (edge-to-edge): Number of teeth > 0 mm: Total sum of (mm × teeth)

LATERAL OPEN BITESee instruction

≥ 0.5 mm: Total sum of (mm × teeth)

Note: Form applies 2 pts per mm per tooth automatically.

CROWDING (only one arch)See instruction

OCCLUSAL RELATIONSHIPSee instruction

End-to-End Class II or III (Number of sides, max 2) Full Class II or III (Number of sides, max 2) Beyond Class II or III (Additional mm)

POSTERIOR CROSSBITESee instruction

Lingual Posterior X-Bite (> 0 mm): Number of teeth Buccal Posterior X-Bite (> 0 mm): Number of teeth

CEPHALOMETRICS (Degrees)See instruction

ANB (Leave blank if N/A) SN-MP (Leave blank if N/A) L1 to MP (Leave blank if N/A)

OTHER (Count of occurrences)See instruction

Supernumerary teeth

Ankylosis (perm. teeth)

Anomalous morphology

Impaction (exc. 3rd molars)

Missing teeth (exc. 3rd)

Missing teeth, congenital

Spacing (4+ per arch)

Tooth transposition

Addl. tx complexities

Midline discrepancy (≥3 mm) [@ 2 pts] Spacing (mx cent diastema ≥ 2 mm) [@ 2 pts] Skeletal asymmetry (nonsurgical tx) [@ 3 pts]

Part 2: The Filled Form

EXAM YEAR

SBO-DO DISCREPANCY INDEX

Resident ID #

CASE#

PATIENT

TOTAL D.I. SCORE

For mm measures, round up to the next full mm.
Examiners will verify measurements in each category.

OVERJET

≥ 0 to < 1 mm (edge-to-edge)= _ pt

≥ 1 to ≤ 3 mm= _ pts

> 3 to ≤ 5 mm= _ pts

> 5 to ≤ 7 mm= _ pts

> 7 to ≤ 9 mm= _ pts

> 9 mm= _ pts

Negative Overjet (x-bite):
1 pt per mm per tooth = _ pts

Total

OVERBITE

> 1 to ≤ 3 mm= _ pts

> 3 to ≤ 5 mm= _ pts

> 5 to ≤ 7 mm= 3 pts

Impinging (100%)= _ pts

Total

ANTERIOR OPEN BITE

0 mm (edge-to-edge), 1 pt per tooth= _ pts

then 1 pt per mm per tooth= _ pts

Total

LATERAL OPEN BITE

≥ 0.5 mm, 2 pts per mm per tooth

Total

CROWDING (only one arch)

≥ 0 to ≤ 1 mm= _ pts

> 1 to ≤ 3 mm= _ pts

> 3 to ≤ 5 mm= _ pts

> 5 to ≤ 7 mm= _ pts

> 7 mm= _ pts

Total

OCCLUSAL RELATIONSHIP

Class I to End On= 0 pts

End-to-End Class II or III= 2 pts per side _ pts

Full Class II or III= 4 pts per side _ pts

Beyond Class II or III
= 1 pt per mm additional _ pts

Total

LINGUAL POSTERIOR X-BITE

> 0 mm, 1 pt per toothTotal

BUCCAL POSTERIOR X-BITE

> 0 mm, 2 pts per toothTotal

CEPHALOMETRICS

ANB ≥ 6° or ≤ -2°@4pts =

Each full degree > 6°_ x 1 pt =

Each full degree < -2°_ x 1 pt = _

SN-MP

≥ 38°@2pts =

Each full degree > 38°_ x 2 pts = _

≤ 26°@1pt =

Each full degree < 26°_ x 1 pt = _

L1 to MP ≥ 99º@1pt =

Each full degree > 99°_ x 1 pt = _

Total

OTHER

Supernumerary teeth_ x 1 pt = _

Ankylosis of permanent teeth_ x 2 pts = _

Anomalous morphology_ x 2 pts = _

Impaction (except 3rd molars)_ x 2 pts = _

Midline discrepancy (≥3 mm)@ 2 pts = _

Missing teeth (except 3rd molars)_ x 1 pt = _

Missing teeth, congenital_ x 2 pts = _

Spacing (4 or more, per arch)_ x 2 pts = _

Spacing (mx cent diastema ≥ 2 mm)@ 2 pts = _

Tooth transposition_ x 2 pts = _

Skeletal asymmetry(nonsurgical tx)@ 3 pts = _

Addl. treatment complexities_ x 2 pts = _

Identify:

Total Other