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Holding the result and managing complications · Orthodontics · INBDE Patient Cases

Retention, Stability & Complications INBDE Patient Cases

By Dr. Isaac Sun, DDS

8 ADA INBDE-format patient cases on retention, stability & complications. Each case is a shared patient box (chief complaint, history, medications, allergies, exam) followed by linked multiple-choice questions with full distractor explanations. Practice the way the real exam is structured.

8 patient cases40 linked questionsADA INBDE formatFull distractor explanations

Eight ADA INBDE-format patient cases on orthodontic retention, stability, and complications: choosing a retainer at deband (Hawley settling vs Essix full-coverage vs fixed bonded lingual), late lower incisor crowding years after treatment driven by continued mandibular growth and PDL fiber recoil with long-term fixed lower retention, apical root resorption found at deband with risk factors and mid-treatment pause-and-repair, white spot lesions and decalcification with prevention plus CPP-ACP and resin infiltration (ICON), gingival recession after buccal expansion in a thin biotype patient with soft-tissue grafting, TMD during treatment with conservative care and referral for persistent severe symptoms, suspected nickel allergy with coated wires and titanium-molybdenum alternatives and allergist consultation, and the common after-hours orthodontic emergencies (poking wires, debonded brackets, broken retainers). Topics include retainer types, retention philosophy, relapse mechanisms, root resorption risk factors, white spot lesion management, biotype-aware planning, TMD considerations, material allergies, and orthodontic emergency management.

Case Coverage Map
What each case is testing
Choosing a retainer at deband:
Hawley settles occlusion + adjustable; Essix full-coverage + aesthetic; fixed bonded retainer avoids compliance but needs hygiene; modern long-term retention.
Lower incisor crowding years after treatment:
Late mandibular growth + PDL recoil drive late lower crowding; limited re-treatment plus fixed lower retention; hygiene aids for bonded retainers.
Apical root resorption found at deband:
Mild resorption is common; severe is rare; risk factors (heavy force, intrusion, jiggling, pipette roots, susceptibility); pause-and-repair mid-treatment.
White spot lesions at deband:
Subsurface enamel demineralization; prevention (plaque control + topical fluoride/varnish + CPP-ACP + diet); ICON/microabrasion for established lesions.
Gingival recession after buccal expansion:
Thin biotype + buccal expansion drives recession; biotype-aware planning; soft-tissue grafting for established symptomatic cases.
TMD during orthodontic treatment:
TMD is multifactorial; ortho neither cause nor cure; conservative care + documentation + referral for severe persistent symptoms.
Suspected nickel allergy in an orthodontic patient:
Oral mucositis/lichenoid reactions; coated wires + TMA + nickel-free systems; allergist consult for severe cases; latex/acrylic also considered.
After-hours orthodontic emergency call:
Wax for poking wires; rebond loose brackets quickly; repair broken bonded retainers; counseling at bond-up reduces call volume.
Patient case: Choosing a retainer at deband
0 of 5 answered, 0 correct
Patient
Female, 17 years old
Chief Complaint
Comprehensive orthodontic treatment completed; deband visit; retention plan discussion.
Background and/or Patient History
  • Comprehensive fixed-appliance case completed
  • Class I molar and canine; well-aligned arches
  • Discussion of Hawley vs Essix vs fixed bonded retainer
Allergies
NKDA
Medications
  • None
Current Findings
  • Routine deband; retention selection
  1. Question 1
    Moderate
    Hawley retainers differ from Essix in that:
  2. Question 2
    Moderate
    A fixed bonded lingual retainer (e.g., lower 3-3):
  3. Question 3
    Easy
    The modern retention philosophy in most cases is:
  4. Question 4
    Moderate
    If the patient prefers maximum aesthetics during the day, a reasonable plan is:
  5. Question 5
    Easy
    The teaching point of retainer selection is that:

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Patient case: Lower incisor crowding years after treatment
0 of 5 answered, 0 correct
Patient
Male, 27 years old
Chief Complaint
Lower incisor crowding noticed years after comprehensive orthodontic treatment.
Background and/or Patient History
  • Comprehensive ortho completed at age 16 with removable Hawley retainers (wear gradually decreased over the years)
  • Late mandibular growth and reduced retention compliance
  • Lower incisor crowding has slowly developed
Allergies
NKDA
Medications
  • None
Current Findings
  • Late lower incisor crowding from inadequate long-term retention
  1. Question 1
    Moderate
    A major contributor to late lower incisor crowding years after treatment is:
  2. Question 2
    Moderate
    Long-term lower retention is widely used because:
  3. Question 3
    Moderate
    A reasonable late management plan for this patient is:
  4. Question 4
    Moderate
    If a bonded lower retainer is placed, hygiene aids include:
  5. Question 5
    Easy
    The teaching point is that retention:

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Patient case: Apical root resorption found at deband
0 of 5 answered, 0 correct
Patient
Female, 16 years old
Chief Complaint
Routine deband panoramic radiograph shows mild apical resorption of the upper centrals.
Background and/or Patient History
  • Comprehensive orthodontic treatment completed (~2.5 years)
  • Deband panoramic radiograph shows mild apical root resorption of upper centrals (~2 mm)
  • Asymptomatic patient
Allergies
NKDA
Medications
  • None
Current Findings
  • Mild apical root resorption at deband
  1. Question 1
    Moderate
    Mild apical root resorption after orthodontic treatment is:
  2. Question 2
    Moderate
    Risk factors for greater root resorption include:
  3. Question 3
    Moderate
    Documentation at deband should include:
  4. Question 4
    Moderate
    If apical resorption had been MORE SIGNIFICANT mid-treatment, the appropriate response is:
  5. Question 5
    Easy
    The teaching point is that root resorption:

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Patient case: White spot lesions at deband
0 of 5 answered, 0 correct
Patient
Male, 15 years old
Chief Complaint
Multiple chalky white opacities around bracket bases on the labial surfaces at deband.
Background and/or Patient History
  • 2 years of comprehensive fixed-appliance treatment with suboptimal hygiene
  • White spot lesions at the gingival and labial margins of multiple brackets
  • Deband visit with discussion of management
Allergies
NKDA
Medications
  • None
Current Findings
  • Established white spot lesions at deband
  1. Question 1
    Moderate
    White spot lesions are:
  2. Question 2
    Moderate
    Initial post-deband management of mild WSL is:
  3. Question 3
    Hard
    For more advanced or aesthetically obvious WSL, additional options include:
  4. Question 4
    Moderate
    Mid-treatment prevention focuses on:
  5. Question 5
    Moderate
    If hygiene remained poor mid-treatment, an option is to:

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Patient case: Gingival recession after buccal expansion
0 of 5 answered, 0 correct
Patient
Female, 18 years old
Chief Complaint
Sensitivity and gingival recession on the buccal of lower canines after expansion-based treatment.
Background and/or Patient History
  • Comprehensive ortho with buccal expansion of the lower arch
  • Thin gingival biotype
  • Buccal recession of 2-3 mm on lower canines after treatment
Allergies
NKDA
Medications
  • None
Current Findings
  • Gingival recession from buccal expansion in a thin-biotype patient
  1. Question 1
    Moderate
    Risk factors for orthodontic-related gingival recession include:
  2. Question 2
    Moderate
    Prevention starts with:
  3. Question 3
    Moderate
    Established symptomatic recession is managed with:
  4. Question 4
    Moderate
    Coordination at this stage involves:
  5. Question 5
    Easy
    The teaching point is that orthodontic recession:

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Patient case: TMD during orthodontic treatment
0 of 5 answered, 0 correct
Patient
Female, 19 years old
Chief Complaint
Bilateral pre-auricular pain and joint clicking during ongoing orthodontic treatment.
Background and/or Patient History
  • Comprehensive ortho in progress
  • Bilateral pre-auricular pain and clicking
  • Pre-existing TMD signs documented at start
Allergies
NKDA
Medications
  • None
Current Findings
  • TMD signs during ortho
  1. Question 1
    Moderate
    Orthodontic treatment and TMD are best described as:
  2. Question 2
    Moderate
    First-line TMD management during ortho includes:
  3. Question 3
    Moderate
    Persistent severe TMD that does not respond to conservative measures should prompt:
  4. Question 4
    Moderate
    Documentation of TMD findings at the START of treatment:
  5. Question 5
    Easy
    The teaching point is that TMD in orthodontic patients:

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Patient case: Suspected nickel allergy in an orthodontic patient
0 of 5 answered, 0 correct
Patient
Female, 14 years old
Chief Complaint
Oral mucositis and lichenoid changes opposite the brackets several weeks into treatment.
Background and/or Patient History
  • Comprehensive fixed-appliance treatment several weeks in
  • Patient with known nickel sensitivity (skin reactions to costume jewelry)
  • Oral mucositis and lichenoid changes opposite the brackets
Allergies
Nickel sensitivity
Medications
  • None
Current Findings
  • Suspected nickel-related oral mucosal reaction
  1. Question 1
    Moderate
    Nickel allergy may present in an orthodontic patient as:
  2. Question 2
    Moderate
    Materials to consider in suspected nickel allergy include:
  3. Question 3
    Moderate
    Other appliance allergens to consider include:
  4. Question 4
    Moderate
    Severe or persistent reactions warrant:
  5. Question 5
    Easy
    The teaching point is that material reactions in ortho:

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Patient case: After-hours orthodontic emergency call
0 of 5 answered, 0 correct
Patient
Male, 13 years old
Chief Complaint
Family calls after hours: a wire is poking the cheek and a bracket has come off.
Background and/or Patient History
  • Active comprehensive orthodontic treatment
  • Distal end of an archwire is poking the cheek
  • A bracket has debonded but is still ligated to the wire
Allergies
NKDA
Medications
  • None
Current Findings
  • Two common after-hours minor emergencies
  1. Question 1
    Easy
    First-line management for the poking wire is to:
  2. Question 2
    Moderate
    If the wire end is very short and can be safely accessed, a clinical option is to:
  3. Question 3
    Moderate
    The debonded bracket still ligated to the wire is best managed by:
  4. Question 4
    Moderate
    If a broken bonded lower retainer is found years after deband, the appropriate response is to:
  5. Question 5
    Easy
    The teaching point of orthodontic emergencies is that:

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Retention, Stability & Complications core recall

Refresh the anatomy facts these cases depend on: nerve numbers, foramina, functions, and lesion findings.

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