MCQs in Oral Pathology

Chapter 16: Abnormalities of teeth

 

 

1- The chemical disintegration of enamel is referred to as:

  1. Abrasion
  2. Attrition
  3. Erosion
  4. Hypoplasia
  5. Pitting

 

 

 

 

 

 

The answer is: C

 

2-Two sisters present to your clinic with yellow teeth (full arch) and diastemas. Radiographically, dentin appears normal. Their father has a similar condition. This condition is known as:

  1. Amelogenesis imperfecta
  2. Dentinogenesis imperfecta
  3. Environmental hypoplasia
  4. Fluorosis
  5. Regional odontodysplasia

 

 

 

 

 

 

The answer is: A

 

3-A patient presents with periapical lesions (cysts and granulomas) and his teeth that show nearly obliterated pulps and short spiky roots. However, his teeth had normal clinical color. This patient most likely has:

  1. Dentin dysplasia
  2. Dentinogenesis imperfecta
  3. Amelogenesis imperfecta
  4. Regional odontodysplasia
  5. Fluorosis

 

 

 

 

 

 

The answer is: A

 

4-Which of the following, makes surgical extraction likely to be very difficult:

  1. Tetracycline staining
  2. Taurodontism
  3. Dens in dente
  4. Ankylosis
  5. None of the above

 

 

 

 

 

 

The answer is: D

 

5-A reduced ability to sweat, missing teeth, fine hair, and xerostomia are seen in:

  1. Cleidocranial dysplasia
  2. Ectodermal dysplasia
  3. Gardner's syndrome
  4. Dentinogenesis imperfecta
  5. Osteogenesis imperfecta

 

 

 

 

 

 

The answer is: B

 

6-Which of the following is correct about dens invaginatus:

  1. Probably occurs as a result of continued proliferation of the dental lamina
  2. Is a common lesion of third molars
  3. Is always a supernumerary tooth
  4. Cannot be detected radiographically
  5. None of the above

 

 

 

 

 

 

The answer is: E

 

7-Which of the following conditions show teeth with elongated crowns, and pulp chambers that are enlarged in apical-occlusal height:

  1. Supernumerary teeth
  2. Regional odontodysplasia
  3. Taurodontism
  4. Dens evaginatus
  5. Dens invaginatus

 

 

 

 

 

 

The answer is: C

 

8-Following pulp exposure related to lingual pit defect, Pulpitis and periapical inflammation are seen in which of the following:

  1. Amelogenesis imperfecta
  2. Regional odontodysplasia
  3. Taurodontism
  4. Dens evaginatus
  5. Dens invaginatus

 

 

 

 

 

The answer is: E

 

9-Poorly formed shells of teeth are seen in which of the following:

  1. Dentin dysplasia
  2. Hypophosphatasia
  3. Regional odontodysplasia
  4. Cleidocranial dysplasia
  5. None of the above

 

 

 

 

 

The answer is: C

 

10- Mottled enamel is produced by:

  1. Syphilis
  2. Febrile diseases
  3. Fluorine
  4. Acids
  5. Tuberculosis

 

 

 

 

 

The answer is: C

 

11- The structures of enamel that are more resistant to the actions of acids are:

  1. Enamel cuticles
  2. Enamel lamellae
  3. Enamel rods
  4. Interprismatic substance of enamel
  5. Ameloblast

 

 

 

 

 

 

The answer is: A

 

12- The most common route by which infection may reach the pulp is through:

  1. The blood stream
  2. Traumatic injuries
  3. Dental caries
  4. Erosion
  5. Periosteum

 

 

 

 

 

 

The answer is: C

 

13- Dens in dente occurs most commonly in the:

  1. Maxillary canines
  2. Mandibular premolars
  3. Mandibular second molars
  4. Maxillary lateral incisors
  5. All incisors

 

 

 

 

 

 

The answer is: D

 

14- In an early carious lesions, the first structure to show evidence of destruction is the:

  1. Enamel prism
  2. Cuticle
  3. Interprismatic substance
  4. Lamellae
  5. Dead tracts

 

 

 

 

 

 

The answer is: C

 

15-The peak incidence of gingivitis in children occurs at ages:

  1. Birth-6 months
  2. 1-3 years
  3. 5-7 years
  4. 7-10 years
  5. 10-13 years

 

 

 

 

 

The answer is: E

 

16- Natal Teeth are seen in all EXCEPT:

 

  1. Vander woude syndrome
  2. Sotos syndrome
  3. Cleft palate
  4. Ellis van syndrome

 

 

 

 

 

 

The answer is: A

 

17- Green stains found on recently erupted upper anterior teeth of child which are not removed after brushing are due to:

 

  1. Chromogenic bacteria
  2. Neonatal Line
  3. Calculus
  4. Materia Alba

 

 

 

 

 

The answer is: A

 

18- To predict the occurrence of caries in a 6 year old child which of the following gives the best result:

 

  1. Sibling caries
  2. Mothers caries
  3. Synders Test
  4. Parental Caries

 

 

 

 

 

The answer is: B

 

19- The reason why primary molars appear lighter in colour is:

 

  1. Due to less thickness of dentin underlying enamel
  2. Different color
  3. Because of contrast with the adjacent tissue
  4. Different refractive index

 

 

 

 

 

 

The answer is: D

 

20-Which of the following is true about mesiodens:

  1. Probably occurs as a result of continued proliferation of the dental lamina
  2. Is the most common supernumerary tooth
  3. Most commonly occurs in the midline of the maxilla
  4. May also be a microdont
  5. All the above

 

 

 

 

 

The answer is: E

 

21-A condition where you have fusion of cementum of two or more teeth is referred to as:

  1. Fusion
  2. Concrescence
  3. Taurodontism
  4. Ankylosis
  5. None of the above

 

 

 

 

 

The answer is: B

 

22-Following wear of a supernumerary cusp , pulpitis and periapical inflammation are seen in:

  1. Amelogenesis imperfecta
  2. Regional odontodysplasia
  3. Turner's tooth
  4. Dens evaginatus
  5. Dens invaginatus

 

 

 

 

 

The answer is: D

 

23-Which of the following does not make tooth extraction more difficult:

  1. Paget's disease
  2. Pulp stones
  3. Dilaceration
  4. Concrescence
  5. Albers-Schonberg disease

 

 

 

 

 

 

The answer is: B

 

24-The phenomenon of a single tooth germ attempting to make two teeth is known as:

  1. Concrescence
  2. Fusion
  3. Gemination
  4. Ankylosis
  5. None of the above

 

 

 

 

 

The answer is: C

 

25-A 7-year-old patient presents with a quadrant of teeth showing abnormal formation of both enamel and dentin. All his other teeth appear clinically normal. Radiographically the affected teeth can be described as ghost teeth. He has:

  1. Regional odontodysplasia
  2. Dens evaginatuse
  3. Dentin dysplasiae
  4. Ectodermal dysplasia
  5. Cleidocranial dysplasia

 

 

 

 

 

 

The answer is: A

 

26-Enamel hypoplasia can result from which of the following:

  1. Congenital syphilis
  2. Nutritional deficiencies in utero or childhood
  3. Exanthematous diseases of childhood such as varicella
  4. Fluoride in drinking water at levels greater than 1 ppm
  5. All the above

 

 

 

 

 

 

The answer is: E

 

27-Excessive production of growth hormone in an adult is responsible for which of the following conditions:

  1. Paget's disease
  2. Acromegaly
  3. Hypophosphatasia
  4. Hemifacial hypertrophy
  5. Gigantism

 

 

 

 

 

The answer is: B

 

28-Which of the following statements is not true about amelogenesis imperfecta:

  1. Caused by environmental factors
  2. Affects all teeth
  3. Usually treated for cosmetic purposes
  4. Pulp chambers are unaffected
  5. Dentin is unaffected

 

 

 

 

 

 

The answer is: A

 

29-A 9-year-old patient presents with an entire dentition of yellow teeth that on x-ray show short spiky roots, obliterated pulps, and tulip-shaped molar crowns. This patient has:

  1. Tetracycline staining
  2. Fluorosis
  3. Amelogenesis imperfecta
  4. Regional odontodysplasia
  5. None of the above

 

 

 

 

 

 

The answer is: E

 

30-Which of the following would most likely affect only one or two teeth of a dentition:

  1. Amelogenesis imperfecta
  2. Regional odontodysplasia
  3. Dentin dysplasia
  4. Dens invaginatus (dens in dente)
  5. Tetracycline stain

 

 

 

 

 

 

The answer is: D