ABO Dentofacial Orthopedics Flashcards

Surgically assisted rapid palatal expansion (SARPE) is indicated primarily in which patient population?

Answer: Skeletally mature patients needing maxillary expansion > 5 mm

SARPE is used in adults or skeletally mature patients where the fused midpalatal suture prevents non-surgical expansion.

Which measurement on a lateral cephalogram best reflects the vertical position of the maxilla?

Answer: Palatal plane to SN angle (SN-PP)

The angle between the palatal plane and the SN plane (SN-PP) quantifies the vertical inclination and position of the maxilla.

When using a bionator appliance, the mandible is typically advanced by how much from the rest position to create an orthopedic stimulus?

Answer: 2–4 mm

A 2–4 mm mandibular advancement is sufficient to stimulate condylar growth without exceeding the patient's neuromuscular adaptation capacity.

The facemask protraction force of 400–600 grams is directed approximately how far below the occlusal plane to minimize clockwise mandibular rotation?

Answer: 15–20 degrees below the occlusal plane and forward

A force directed approximately 15–20 degrees below the occlusal plane tends to minimize the clockwise mandibular rotation that worsens the vertical dimension.

In orthopedic treatment, 'dentoalveolar compensation' refers to:

Answer: Dental tipping that masks an underlying skeletal discrepancy

Dentoalveolar compensation occurs when teeth incline to partially camouflage a skeletal jaw discrepancy, reducing the apparent severity of the skeletal problem.

Thumb or finger sucking habits are most likely to cause which type of malocclusion?

Answer: Anterior open bite, upper incisor proclination, and constricted upper arch

Thumb sucking places the thumb between the arches, proclines upper incisors, creates an anterior open bite, and constricts the upper arch through cheek pressure.