RADIOBIOLOGY MCQs – Oral Radiology MCQs

RADIOBIOLOGY MCQs – Oral Radiology MCQs

RADIOBIOLOGY MCQs – Oral Radiology MCQs

1. Example of deterministic effects are
A. Mucositis resulting from radiation therapy to oral cavity
B. Radiation-induced cataract formation
C. Both the above
D. None of the above

2. Stochastic effects caused by
A. Sublethal damage to DNA
B. Killing of many cells
C. Both of the above
D. None of the above

3. Severity of clinical effects is proportional to dose in case of
A. Deterministic effects
B. Stochastic effects
C. Both
D. None

4. Deterministic effect is
A. Probability of effect is independent of dose
B. Frequency of effect is proportional to dose
C. Severity of clinical effects is independent of dose
D. Severity of clinical effects is not proportional to dose

5. If radiation exposure occurs in G2 phase, then it results in
A. Chromatid aberration
B. Chromosome aberration
C. Chromosome translocation
D. Chromatid translocation

6. Different cells from various organs… recognized by French radiobiologists ________ and _____________.
Answer: Bergonié and Tribondeau

7. Which of the following cell is highly radiosensitive?
A. Endothelial cells
B. Basal cells of oral mucous
C. Vascular endothelial cells
D. Fibroblasts

8. All are radiosensitive organs except
A. Lymphoid
B. Mucous membrane
C. Bone marrow
D. Muscle

9. Dose rate indicates
A. Amount of dose given
B. Rate of exposure
C. Actual dose
D. Dose required

10. Which of the following is false regarding taste loss after radiation exposure?
A. Taste acuity decreases by a factor of 100–1,000
B. It is reversible
C. Recovery takes 2–4 months
D. Seen during second or third week of radiotherapy

11. Acute radiation syndrome – severe hematopoietic symptoms seen at a dose of
A. 1–2 Gy
B. >50 Gy
C. 4–7 Gy
D. 7–15 Gy

12. Radiation effect on blood cells – which cell has least duration?
A. Lymphocyte
B. Granulocyte
C. Platelets
D. Erythrocytes

13. All are low susceptible organs except
A. Salivary glands
B. Skin
C. Brain
D. Stomach

RADIOLOGICAL INTERPRETATION

1. Supernumerary teeth occur in ______ of the population
A. 1–4%
B. 5–8%
C. 12%
D. Less than 1%

2. Multiple supernumerary teeth occur most frequently in the ______ regions, usually in the _______
A. Molar, maxilla
B. Molar, mandible
C. Premolar, mandible
D. Anterior region, maxilla

3. Supernumerary teeth occur mostly in
A. Females
B. Males
C. Equal gender predilection
D. None of the above

4. Radiographs may reveal supernumerary teeth in the deciduous dentition after __________ years of age
A. 2–3 years
B. 3–4 years
C. Younger than 1 year
D. Older than 4 years

5. Radiographs may reveal supernumerary teeth in the permanent dentition after __________ years of age
A. 6–8 years
B. 8–9 years
C. Older than 9–12 years
D. Older than 12 years

6. Which of the following is false about pyknodysostosis?
A. Obtuse mandibular gonial angle often with relative prognathism
B. Osteopetrosis
C. Premature closure of sutures in skull
D. Autosomal recessive and also known as Toulouse-Lautrec syndrome

7. Hypodontia in the permanent dentition, excluding third molars, is found in ______ of the population
A. 10%
B. 1%
C. 15%
D. 20%

8. Peridens refers to
A. Supernumerary teeth that occur in the premolar region
B. Supernumerary teeth that occur in molar region
C. Both of the above
D. Supernumerary teeth distal to premolar

9. Although missing primary teeth are relatively uncommon, when one tooth is missing, it is usually a _________
A. Maxillary incisor
B. Mandibular incisor
C. Maxillary/mandibular first molars
D. Maxillary/mandibular second molars

10. Hemangioma is associated with
A. Macrodontia
B. Microdontia
C. Hypodontia
D. Synodontia

11. What is true concrescence?
A. If the condition occurs during development it is called true concrescence
B. If there is complete fusion of root of tooth it is called true concrescence
C. If it occurs in molar region it is called true concrescence
D. All of the above

12. Although gemination may occur in both dentitions, it more frequently affects the ________
A. Primary teeth
B. Permanent teeth
C. Equal in both
D. None of the above

13. Statements regarding Gemination
A – Occurrence in males and females is about equal
B – The enamel or dentin may be hypoplastic or hypocalcified
A. Both are true
B. Both are false
C. A true, B false
D. A false, B true

14. Gestant odontoma is also known as
A. Dens in dente
B. Dens evaginatus
C. Regional odontodysplasia
D. Enamel pearl

15. Incidence of dentinogenesis imperfecta
A. 1:2,000
B. 1:4,000
C. 1:6,000
D. 1:8,000

16. Which of the following is true about osteogenesis imperfecta?
A. Autosomal recessive
B. Increased incidence of impacted first and second molars
C. Class 2 malocclusion
D. Dentinogenesis imperfecta is found in 45 % of the patients

17. Most common tooth involved in case of dens evaginatus is
A. Mandibular premolar
B. Maxillary premolar
C. Lateral incisors
D. Canines

18. Bull’s eye appearance of the root apex is seen in case of
A. Dilaceration
B. Dilated odontome
C. Dentinogenesis imperfecta
D. Regional odontodysplasia