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Growth that shapes treatment · Orthodontics · INBDE Patient Cases

Growth & Development INBDE Patient Cases

By Dr. Isaac Sun, DDS

7 ADA INBDE-format patient cases on growth & development. 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.

7 patient cases35 linked questionsADA INBDE formatFull distractor explanations

Seven ADA INBDE-format patient cases on orthodontic growth and development: delayed eruption of the first permanent molar with eruption norms and panoramic workup, mild lower crowding in the late mixed dentition resolving through leeway-space utilization (with a passive lower lingual arch), spacing in the primary dentition with primate spaces as a developmental norm, the transient 'ugly duckling' stage of flared upper centrals resolving with permanent canine eruption, timing a Twin Block functional appliance to the pubertal growth spurt with CVM staging, pediatric condylar trauma and the risk of arrested mandibular growth and TMJ ankylosis with conservative management, and the forward vs backward mandibular growth rotation distinction that drives high-pull vs cervical headgear choice and Le Fort I impaction surgery in severe long-face non-growing patients. Topics include craniofacial growth mechanisms, mandibular growth at the condyle, eruption timing, mixed-dentition analysis (Moyers and Tanaka-Johnston), leeway space, primate spaces, the ugly-duckling stage, and growth-rotation patterns.

Case Coverage Map
What each case is testing
Delayed eruption of the first permanent molar:
Eruption norms (mandibular first molar/incisor at ~6, mandibular before maxillary), workup of delay, and the consequences of early loss of the first permanent molar.
Mild lower crowding in the late mixed dentition:
Leeway space (mandibular > maxillary), passive lower lingual arch, leeway utilization, and reassurance vs intervention.
Spacing in the primary dentition (and what it means):
Generalized spacing and primate spaces (mesial upper canine, distal lower canine) as developmental norms; absence predicts permanent crowding.
The 'ugly duckling' stage:
Transient flared upper centrals with midline diastema (~ages 7-9); resolves with permanent canine eruption; persistent diastema differential.
Timing a functional appliance to the growth spurt:
Twin Block/Herbst at or just before the pubertal peak; CVM staging on the lateral ceph; girls earlier than boys.
Pediatric condylar trauma and mandibular growth:
Condylar cartilage as a growth site, conservative management, TMJ ankylosis risk, and asymmetric growth arrest.
Forward vs backward mandibular rotation:
Dolichofacial vs brachyfacial pattern, high-pull vs cervical headgear, TAD-supported posterior intrusion, and Le Fort I impaction surgery in severe long-face non-growing patients.
Patient case: Delayed eruption of the first permanent molar
0 of 5 answered, 0 correct
Patient
Male, 7 years old
Chief Complaint
Family asks why the 'big back teeth' have not come in yet.
Background and/or Patient History
  • No medical issues
  • Maxillary central incisors visible but lower first permanent molars not erupted
  • Otherwise healthy growth and development
Allergies
NKDA
Medications
  • None
Current Findings
  • Eruption pattern question
  • Reassurance and continued observation
  1. Question 1
    Easy
    The first permanent tooth to erupt is usually:
  2. Question 2
    Moderate
    Mandibular teeth generally erupt:
  3. Question 3
    Moderate
    If the lower first molar is several years late, the next step is:
  4. Question 4
    Moderate
    Loss of a lower first permanent molar in a 7-year-old can lead to:
  5. Question 5
    Easy
    The teaching point is that eruption timing:

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Patient case: Mild lower crowding in the late mixed dentition
0 of 5 answered, 0 correct
Patient
Female, 10 years old
Chief Complaint
Family asks if the slightly crowded lower front teeth will need braces.
Background and/or Patient History
  • Mixed dentition; permanent lower incisors slightly crowded (~2 mm)
  • Lower primary canines and primary molars (D and E) present
  • Class I molar relationship
Allergies
NKDA
Medications
  • None
Current Findings
  • Mild lower incisor crowding in late mixed dentition
  • Opportunity for leeway-space utilization
  1. Question 1
    Moderate
    Leeway space arises because:
  2. Question 2
    Hard
    Leeway space is greater in the:
  3. Question 3
    Moderate
    To preserve leeway space until the deciduous canine and molars exfoliate, the dentist can consider a:
  4. Question 4
    Moderate
    Without intervention, the most likely course is:
  5. Question 5
    Easy
    The teaching point is that the mixed dentition:

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Patient case: Spacing in the primary dentition (and what it means)
0 of 5 answered, 0 correct
Patient
Male, 4 years old
Chief Complaint
Family worried about 'gaps between the baby teeth.'
Background and/or Patient History
  • Healthy 4-year-old with primary dentition
  • Generalized spacing in the upper and lower arches
  • Larger spaces mesial to the maxillary canines and distal to the mandibular canines
Allergies
NKDA
Medications
  • None
Current Findings
  • Normal spacing in the deciduous dentition (including primate spaces)
  1. Question 1
    Easy
    Generalized spacing in the deciduous dentition is:
  2. Question 2
    Hard
    Primate spaces are typically located:
  3. Question 3
    Moderate
    A child WITHOUT spacing in the deciduous dentition is at higher risk for:
  4. Question 4
    Easy
    Counseling for this family should emphasize:
  5. Question 5
    Easy
    The teaching point is that primary dentition spacing:

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Patient case: The 'ugly duckling' stage
0 of 5 answered, 0 correct
Patient
Female, 8 years old
Chief Complaint
Family worried about 'crooked, flared' upper front teeth and a midline gap.
Background and/or Patient History
  • Late mixed dentition; permanent upper centrals erupted but flared with a midline diastema
  • Permanent maxillary canines not yet erupted
  • Otherwise normal development
Allergies
NKDA
Medications
  • None
Current Findings
  • Classic 'ugly-duckling' stage
  • Reassurance and observation
  1. Question 1
    Moderate
    The 'ugly duckling' stage describes:
  2. Question 2
    Hard
    The midline diastema in this stage is driven by:
  3. Question 3
    Moderate
    The appropriate first-line action is:
  4. Question 4
    Hard
    If a midline diastema PERSISTS after permanent canine eruption, possible causes include:
  5. Question 5
    Easy
    The teaching point is that the ugly-duckling stage:

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Patient case: Timing a functional appliance to the growth spurt
0 of 5 answered, 0 correct
Patient
Female, 11 years old
Chief Complaint
Class II Div 1 with mandibular retrognathia; family asks about timing for a Twin Block appliance.
Background and/or Patient History
  • Class II Div 1 with mandibular retrognathia
  • Pubertal growth spurt approaching per CVM staging
  • Discussion of Twin Block timing
Allergies
NKDA
Medications
  • None
Current Findings
  • Growing skeletal Class II patient near the spurt
  • Functional appliance candidate
  1. Question 1
    Easy
    Functional appliances (Twin Block, Herbst) work best when used:
  2. Question 2
    Moderate
    Skeletal maturity is estimated noninvasively by:
  3. Question 3
    Moderate
    Girls reach the pubertal growth peak:
  4. Question 4
    Moderate
    After successful functional appliance use, the next phase is usually:
  5. Question 5
    Easy
    The teaching point is that functional appliances:

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Patient case: Pediatric condylar trauma and mandibular growth
0 of 5 answered, 0 correct
Patient
Male, 6 years old
Chief Complaint
Recent fall onto the chin; the mandibular condyle is now non-displaced fractured.
Background and/or Patient History
  • Healthy 6-year-old with an isolated non-displaced unilateral condylar fracture
  • Conservative management (soft diet, jaw mobilization)
  • Family asks about long-term growth consequences
Allergies
NKDA
Medications
  • None
Current Findings
  • Pediatric unilateral condylar fracture
  • Growth-site injury concern
  1. Question 1
    Easy
    The condylar cartilage is:
  2. Question 2
    Hard
    Severe pediatric condylar trauma can cause:
  3. Question 3
    Moderate
    Management of a non-displaced condylar fracture in this age is typically:
  4. Question 4
    Moderate
    A late complication of condylar trauma in children includes:
  5. Question 5
    Easy
    The teaching point is that the mandibular condyle:

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Patient case: Forward vs backward mandibular rotation
0 of 5 answered, 0 correct
Patient
Male, 12 years old
Chief Complaint
Long-face appearance with anterior open bite and prominent gummy smile.
Background and/or Patient History
  • Long-face profile with steep mandibular plane
  • Anterior open bite
  • Cephalometric FMA 38°
Allergies
NKDA
Medications
  • None
Current Findings
  • Dolichofacial pattern with backward mandibular rotation tendency
  • High-angle Class II treatment plan discussion
  1. Question 1
    Hard
    The patient's growth pattern is best described as:
  2. Question 2
    Hard
    In a growing high-angle Class II patient, headgear of choice is usually:
  3. Question 3
    Hard
    If a posterior open bite later requires correction in a non-growing patient with severe high-angle pattern, possible mechanics include:
  4. Question 4
    Hard
    If severe and non-growing, the surgical option might include:
  5. Question 5
    Easy
    The teaching point is that mandibular growth rotation:

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Growth & Development core recall

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