ABO ABO Periodontics and Interdisciplinary Treatment

Question 1

Orthodontic tooth movement is contraindicated in areas with active periodontitis primarily because:

Accepted Answer

Moving teeth through infected periodontium accelerates alveolar bone loss

Answer

Active periodontal infection in the alveolar bone combined with orthodontic forces accelerates bone resorption, worsening the patient's periodontal prognosis.

Question 2

Orthodontic intrusion of an overerupted tooth with chronic periodontitis can help by:

Accepted Answer

Reducing the infrabony defect depth and improving the osseous topography

Answer

Intrusion of periodontally involved over-erupted teeth can improve infrabony defect geometry, making subsequent periodontal surgery more predictable.

Question 3

Before starting orthodontic treatment in a patient with a history of periodontitis, the MOST important prerequisite is:

Accepted Answer

Achievement of periodontal stability (BOP < 20%, controlled disease)

Answer

Periodontal stability with minimal bleeding on probing confirms that active infection is controlled, making it safe to initiate orthodontic forces.

Question 4

Patients with a thin gingival biotype are at higher risk for which complication during orthodontic treatment?

Accepted Answer

Gingival recession, especially when moving teeth facially

Answer

Thin gingival tissue has reduced capacity to withstand orthodontic forces, making facial tooth movement more likely to cause gingival recession.

Question 5

Orthodontically forced eruption (extrusion) of a fractured tooth prior to crown placement serves to:

Accepted Answer

Bring the fracture margin supragingivally and develop bone/tissue for restorative margins

Answer

Forced eruption brings the fracture line coronal to the alveolar crest and gingival margin, providing adequate tooth structure and biological width for a crown.

American Board of Orthodontics (ABO) Practice Test

American Board of Orthodontics (ABO) Practice Test

ABO ABO Periodontics and Interdisciplinary Treatment