ADEX Periodontal Examination Practice
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
ADEX Dental Licensing Exam Prep &
Study Guide
1. A 48-year-old patient presents with generalized 5–6 mm periodontal
probing depths, bleeding on probing, radiographic horizontal bone loss, and
several sites with furcation involvement. Which finding most strongly
supports periodontitis rather than gingivitis?
A. Gingival erythema
B. Bleeding on probing
C. Clinical attachment loss attributable to periodontal destruction
D. Plaque accumulation
Answer: Clinical attachment loss attributable to periodontal destruction
Rationale: Periodontitis is characterized by periodontal attachment loss and
supporting bone destruction. Gingivitis may produce inflammation and bleeding
but does not cause true periodontal attachment loss.
, 2. A patient has a periodontal pocket measuring 7 mm on the facial aspect of
a mandibular molar. The gingival margin is located 3 mm apical to the
cemento-enamel junction. What is the clinical attachment level?
A. 4 mm
B. 7 mm
C. 10 mm
D. 3 mm
Answer: 10 mm
Rationale: When the gingival margin is apical to the CEJ, the recession is added
to the probing depth. CAL = probing depth + recession = 7 + 3 = 10 mm.
3. During periodontal charting, a probe penetrates approximately 1–2 mm
into clinically healthy junctional epithelium and connective tissue. Which
factor primarily accounts for variation in probing depth?
A. Tooth color
B. Probing force and tissue inflammation
C. Enamel thickness
D. Occlusal anatomy
Answer: Probing force and tissue inflammation
Rationale: Probe penetration is influenced by probing force, inflammation,
tissue consistency, probe diameter, and the orientation of the probe. Inflamed
tissues permit deeper penetration than healthy tissues.
4. A patient exhibits generalized bleeding on probing and abundant plaque
but has no clinical attachment loss or radiographic bone loss. What is the
most appropriate diagnosis?
A. Stage III periodontitis
B. Periodontal abscess
C. Gingivitis
D. Necrotizing periodontitis
,Answer: Gingivitis
Rationale: Gingivitis is an inflammatory condition confined to the gingiva
without periodontal attachment or alveolar bone destruction.
5. Which periodontal pocket is most directly associated with destruction of
the periodontal ligament and alveolar bone?
A. Gingival pseudopocket
B. Suprabony pocket
C. Periodontal pocket
D. Developmental gingival groove
Answer: Periodontal pocket
Rationale: A true periodontal pocket develops when inflammatory periodontal
destruction causes apical migration of the junctional epithelium and loss of
connective tissue attachment.
6. A patient has a 6-mm probing depth and the gingival margin is located 2
mm coronal to the CEJ. What is the clinical attachment level?
A. 2 mm
B. 4 mm
C. 6 mm
D. 8 mm
Answer: 4 mm
Rationale: When the gingival margin is coronal to the CEJ, the amount of
coronal gingival enlargement is subtracted from probing depth: 6 − 2 = 4 mm
CAL.
7. Which radiographic finding is most consistent with chronic periodontal
destruction?
A. Widened pulp chamber
B. Loss of lamina dura only
, C. Crestal and angular alveolar bone loss
D. Increased enamel radiopacity
Answer: Crestal and angular alveolar bone loss
Rationale: Periodontitis produces loss of supporting alveolar bone, which may
appear as horizontal or vertical/angular defects depending on the pattern of
destruction.
8. Which periodontal instrument is specifically designed to detect subgingival
calculus and evaluate root surface irregularities?
A. Explorer
B. College pliers
C. Excavator
D. Amalgam condenser
Answer: Explorer
Rationale: A periodontal explorer is designed for tactile detection of subgingival
deposits, root irregularities, and calculus.
9. A patient has a deep periodontal pocket on the distal surface of a maxillary
first molar. The probe cannot reach the entire pocket because of limited
access. Which radiographic projection may provide additional information
about the area?
A. Bitewing radiograph
B. Occlusal radiograph only
C. Cephalometric radiograph
D. Panoramic radiograph only
Answer: Bitewing radiograph
Rationale: Bitewings are particularly useful for evaluating posterior crestal bone
levels and interproximal areas, although clinical probing remains essential.
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
ADEX Dental Licensing Exam Prep &
Study Guide
1. A 48-year-old patient presents with generalized 5–6 mm periodontal
probing depths, bleeding on probing, radiographic horizontal bone loss, and
several sites with furcation involvement. Which finding most strongly
supports periodontitis rather than gingivitis?
A. Gingival erythema
B. Bleeding on probing
C. Clinical attachment loss attributable to periodontal destruction
D. Plaque accumulation
Answer: Clinical attachment loss attributable to periodontal destruction
Rationale: Periodontitis is characterized by periodontal attachment loss and
supporting bone destruction. Gingivitis may produce inflammation and bleeding
but does not cause true periodontal attachment loss.
, 2. A patient has a periodontal pocket measuring 7 mm on the facial aspect of
a mandibular molar. The gingival margin is located 3 mm apical to the
cemento-enamel junction. What is the clinical attachment level?
A. 4 mm
B. 7 mm
C. 10 mm
D. 3 mm
Answer: 10 mm
Rationale: When the gingival margin is apical to the CEJ, the recession is added
to the probing depth. CAL = probing depth + recession = 7 + 3 = 10 mm.
3. During periodontal charting, a probe penetrates approximately 1–2 mm
into clinically healthy junctional epithelium and connective tissue. Which
factor primarily accounts for variation in probing depth?
A. Tooth color
B. Probing force and tissue inflammation
C. Enamel thickness
D. Occlusal anatomy
Answer: Probing force and tissue inflammation
Rationale: Probe penetration is influenced by probing force, inflammation,
tissue consistency, probe diameter, and the orientation of the probe. Inflamed
tissues permit deeper penetration than healthy tissues.
4. A patient exhibits generalized bleeding on probing and abundant plaque
but has no clinical attachment loss or radiographic bone loss. What is the
most appropriate diagnosis?
A. Stage III periodontitis
B. Periodontal abscess
C. Gingivitis
D. Necrotizing periodontitis
,Answer: Gingivitis
Rationale: Gingivitis is an inflammatory condition confined to the gingiva
without periodontal attachment or alveolar bone destruction.
5. Which periodontal pocket is most directly associated with destruction of
the periodontal ligament and alveolar bone?
A. Gingival pseudopocket
B. Suprabony pocket
C. Periodontal pocket
D. Developmental gingival groove
Answer: Periodontal pocket
Rationale: A true periodontal pocket develops when inflammatory periodontal
destruction causes apical migration of the junctional epithelium and loss of
connective tissue attachment.
6. A patient has a 6-mm probing depth and the gingival margin is located 2
mm coronal to the CEJ. What is the clinical attachment level?
A. 2 mm
B. 4 mm
C. 6 mm
D. 8 mm
Answer: 4 mm
Rationale: When the gingival margin is coronal to the CEJ, the amount of
coronal gingival enlargement is subtracted from probing depth: 6 − 2 = 4 mm
CAL.
7. Which radiographic finding is most consistent with chronic periodontal
destruction?
A. Widened pulp chamber
B. Loss of lamina dura only
, C. Crestal and angular alveolar bone loss
D. Increased enamel radiopacity
Answer: Crestal and angular alveolar bone loss
Rationale: Periodontitis produces loss of supporting alveolar bone, which may
appear as horizontal or vertical/angular defects depending on the pattern of
destruction.
8. Which periodontal instrument is specifically designed to detect subgingival
calculus and evaluate root surface irregularities?
A. Explorer
B. College pliers
C. Excavator
D. Amalgam condenser
Answer: Explorer
Rationale: A periodontal explorer is designed for tactile detection of subgingival
deposits, root irregularities, and calculus.
9. A patient has a deep periodontal pocket on the distal surface of a maxillary
first molar. The probe cannot reach the entire pocket because of limited
access. Which radiographic projection may provide additional information
about the area?
A. Bitewing radiograph
B. Occlusal radiograph only
C. Cephalometric radiograph
D. Panoramic radiograph only
Answer: Bitewing radiograph
Rationale: Bitewings are particularly useful for evaluating posterior crestal bone
levels and interproximal areas, although clinical probing remains essential.
