SRTA Periodontal Examination Practice
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
SRTA Dental Licensing Exam Prep &
Study Guide
1. A patient presents with generalized 5–6 mm probing depths, bleeding on
probing, subgingival calculus, and radiographic horizontal bone loss. The
most appropriate initial periodontal diagnosis is:
A. Localized gingivitis
B. Generalized periodontitis
C. Acute necrotizing ulcerative gingivitis
D. Traumatic occlusal injury
Answer: Generalized periodontitis
Rationale: The combination of generalized periodontal pocketing, clinical
attachment loss, bleeding, calculus, and radiographic alveolar bone loss is
consistent with periodontitis rather than gingivitis.
, 2. Which clinical measurement most directly reflects the amount of
periodontal support lost during disease progression?
A. Probing depth
B. Gingival index
C. Clinical attachment level
D. Plaque index
Answer: Clinical attachment level
Rationale: Clinical attachment level incorporates the position of the gingival
margin relative to the cemento-enamel junction and provides a more stable
measure of periodontal attachment loss than probing depth alone.
3. A patient has a 7-mm probing depth with the gingival margin located 3 mm
apical to the CEJ. 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, recession is added to
probing depth. Therefore, CAL = 7 mm + 3 mm = 10 mm.
4. Which finding is most characteristic of a periodontal pocket rather than a
pseudopocket?
A. Coronal enlargement of gingival tissue without attachment loss
B. Increased probing depth caused exclusively by edema
C. Apical migration of the junctional epithelium
D. Increased gingival volume with an intact attachment apparatus
Answer: Apical migration of the junctional epithelium
,Rationale: A true periodontal pocket results from apical migration of the
junctional epithelium with destruction of connective tissue attachment.
5. Which microorganism is strongly associated with severe periodontal
destruction and is frequently detected in advanced periodontitis?
A. Streptococcus mutans
B. Porphyromonas gingivalis
C. Lactobacillus acidophilus
D. Candida albicans
Answer: Porphyromonas gingivalis
Rationale: P. gingivalis is a key periodontal pathogen associated with dysbiotic
subgingival biofilms and destructive periodontal inflammation.
6. Which periodontal instrument is specifically designed primarily for
detecting calculus and evaluating root surface characteristics?
A. Sickle scaler
B. Periodontal probe
C. Explorer
D. Hoe scaler
Answer: Explorer
Rationale: An explorer provides tactile sensitivity for detecting subgingival
calculus, root irregularities, and restoration margins.
7. Which instrument is most appropriate for subgingival scaling on the distal
surface of a mandibular molar?
A. Universal curette
B. Gracey 13/14 curette
C. Gracey 1/2 curette
D. Sickle scaler
Answer: Gracey 13/14 curette
, Rationale: The Gracey 13/14 is designed for posterior teeth, particularly distal
surfaces of molars.
8. The primary advantage of a Gracey curette compared with a universal
curette is that the Gracey curette:
A. Has two cutting edges that are equally active
B. Is designed with a blade offset for specific tooth surfaces
C. Cannot be used subgingivally
D. Is intended only for supragingival calculus
Answer: Is designed with a blade offset for specific tooth surfaces
Rationale: Gracey curettes are area-specific instruments with a single working
cutting edge and a blade designed for adaptation to particular tooth surfaces.
9. When adapting a curette to a deep periodontal pocket, the ideal working-
end angulation during subgingival instrumentation is approximately:
A. 0–15 degrees
B. 20–30 degrees
C. 60–80 degrees
D. 120–140 degrees
Answer: 60–80 degrees
Rationale: A 60–80-degree angle between the face of the curette and the tooth
surface permits effective calculus removal while reducing unnecessary tissue
trauma.
10.Which stroke is most appropriate for removing tenacious subgingival
calculus?
A. Light exploratory stroke
B. Short, controlled calculus-removal stroke
C. Long sweeping stroke with minimal lateral pressure
D. Random horizontal stroke
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
SRTA Dental Licensing Exam Prep &
Study Guide
1. A patient presents with generalized 5–6 mm probing depths, bleeding on
probing, subgingival calculus, and radiographic horizontal bone loss. The
most appropriate initial periodontal diagnosis is:
A. Localized gingivitis
B. Generalized periodontitis
C. Acute necrotizing ulcerative gingivitis
D. Traumatic occlusal injury
Answer: Generalized periodontitis
Rationale: The combination of generalized periodontal pocketing, clinical
attachment loss, bleeding, calculus, and radiographic alveolar bone loss is
consistent with periodontitis rather than gingivitis.
, 2. Which clinical measurement most directly reflects the amount of
periodontal support lost during disease progression?
A. Probing depth
B. Gingival index
C. Clinical attachment level
D. Plaque index
Answer: Clinical attachment level
Rationale: Clinical attachment level incorporates the position of the gingival
margin relative to the cemento-enamel junction and provides a more stable
measure of periodontal attachment loss than probing depth alone.
3. A patient has a 7-mm probing depth with the gingival margin located 3 mm
apical to the CEJ. 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, recession is added to
probing depth. Therefore, CAL = 7 mm + 3 mm = 10 mm.
4. Which finding is most characteristic of a periodontal pocket rather than a
pseudopocket?
A. Coronal enlargement of gingival tissue without attachment loss
B. Increased probing depth caused exclusively by edema
C. Apical migration of the junctional epithelium
D. Increased gingival volume with an intact attachment apparatus
Answer: Apical migration of the junctional epithelium
,Rationale: A true periodontal pocket results from apical migration of the
junctional epithelium with destruction of connective tissue attachment.
5. Which microorganism is strongly associated with severe periodontal
destruction and is frequently detected in advanced periodontitis?
A. Streptococcus mutans
B. Porphyromonas gingivalis
C. Lactobacillus acidophilus
D. Candida albicans
Answer: Porphyromonas gingivalis
Rationale: P. gingivalis is a key periodontal pathogen associated with dysbiotic
subgingival biofilms and destructive periodontal inflammation.
6. Which periodontal instrument is specifically designed primarily for
detecting calculus and evaluating root surface characteristics?
A. Sickle scaler
B. Periodontal probe
C. Explorer
D. Hoe scaler
Answer: Explorer
Rationale: An explorer provides tactile sensitivity for detecting subgingival
calculus, root irregularities, and restoration margins.
7. Which instrument is most appropriate for subgingival scaling on the distal
surface of a mandibular molar?
A. Universal curette
B. Gracey 13/14 curette
C. Gracey 1/2 curette
D. Sickle scaler
Answer: Gracey 13/14 curette
, Rationale: The Gracey 13/14 is designed for posterior teeth, particularly distal
surfaces of molars.
8. The primary advantage of a Gracey curette compared with a universal
curette is that the Gracey curette:
A. Has two cutting edges that are equally active
B. Is designed with a blade offset for specific tooth surfaces
C. Cannot be used subgingivally
D. Is intended only for supragingival calculus
Answer: Is designed with a blade offset for specific tooth surfaces
Rationale: Gracey curettes are area-specific instruments with a single working
cutting edge and a blade designed for adaptation to particular tooth surfaces.
9. When adapting a curette to a deep periodontal pocket, the ideal working-
end angulation during subgingival instrumentation is approximately:
A. 0–15 degrees
B. 20–30 degrees
C. 60–80 degrees
D. 120–140 degrees
Answer: 60–80 degrees
Rationale: A 60–80-degree angle between the face of the curette and the tooth
surface permits effective calculus removal while reducing unnecessary tissue
trauma.
10.Which stroke is most appropriate for removing tenacious subgingival
calculus?
A. Light exploratory stroke
B. Short, controlled calculus-removal stroke
C. Long sweeping stroke with minimal lateral pressure
D. Random horizontal stroke
