Age Determination- Teeth

Age Determination- Teeth

Q. 1

Among the secondary changes in tooth the most useful one for age determination is:

 A

Attrition

 B

Secondary dentine deposition

 C

Root resorption

 D

Root transparency

Q. 1

Among the secondary changes in tooth the most useful one for age determination is:

 A

Attrition

 B

Secondary dentine deposition

 C

Root resorption

 D

Root transparency

Ans. D

Explanation:

Gustafson’s criteria is used to determine the age base on the secondary changes in the tooth.

Among the criteria transparency of the root is considered to be the single most important one in age determination.

In this, the two opposite sides of an extracted or naturally fallen tooth is ground uniformly to thin in upto less than 1mm thickness.

Then its transparency is assessed and and the age is estimated with the help of a regression line prepared by study in the translucency of teeth of known ages.

 
The Gustafson’s criteria for age determination includes:
  • Attrition
  • Periodontosis
  • Secondary dentin
  • Cementum apposition
  • Root resorption
  • Root transparency
Ref: Textbook Of Forensic Medicine And Toxicology: Principles And Practice By Vij page 53.

Q. 2

Eruption of temporary teeth will be completed by :

 A

One to one and half year

 B

Two to two and half year

 C

Three to four years

 D

Four to five years

Q. 2

Eruption of temporary teeth will be completed by :

 A

One to one and half year

 B

Two to two and half year

 C

Three to four years

 D

Four to five years

Ans. B

Explanation:

B i.e. 2-21/2 years


Q. 3

A girl of 10 years will have….. permanent and……. temporary teeth :

 A

8,12

 B

8,16

 C

16,8

 D

12,12

Q. 3

A girl of 10 years will have….. permanent and……. temporary teeth :

 A

8,12

 B

8,16

 C

16,8

 D

12,12

Ans. C

Explanation:

C i.e. 16, 8

Quiz In Between


Q. 4

The primary dentition begins to show teeth eruption by-

 A

6 weeks

 B

12 weeks

 C

6 months

 D

12months

Q. 4

The primary dentition begins to show teeth eruption by-

 A

6 weeks

 B

12 weeks

 C

6 months

 D

12months

Ans. A

Explanation:

Ans. is ‘a’ i.e., 6 weeks

o Rule of six :-

Primary (temporary) dentition begins  —> 6 weeks.

Secondary (permanent) dentition begins —> 6 years.


Q. 5

At what age do first permanent teeth appear ?

 A

5 years

 B

6 years

 C

7 years

 D

8 years

Q. 5

At what age do first permanent teeth appear ?

 A

5 years

 B

6 years

 C

7 years

 D

8 years

Ans. B

Explanation:

Ans. is ‘b’ i.e., 6 years

o First primary (milk) tooth erupts at 6 months.

o First secondary (permanent) tooth appear at 6 year of age.


Q. 6

Delayed dentition is seen in all/except

 A

Down syndrome

 B

Congenital hypothyroidism

 C

Rickets

 D

All of above

Q. 6

Delayed dentition is seen in all/except

 A

Down syndrome

 B

Congenital hypothyroidism

 C

Rickets

 D

All of above

Ans. D

Explanation:

Ans. is ‘d’ i.e., All of above

Quiz In Between


Q. 7

True about dentition –

 A

Hypothyroidism causes delayed dentition

 B

Premolar is not seen in primary dentition

 C

3rd molar is the last to appear in secondary dentition

 D

All

Q. 7

True about dentition –

 A

Hypothyroidism causes delayed dentition

 B

Premolar is not seen in primary dentition

 C

3rd molar is the last to appear in secondary dentition

 D

All

Ans. D

Explanation:

Ans. is ‘a’ i.e., Hypothyroidism causes delayed dentition; ‘b’ i.e., Premolar is not seen in primary dentition; ‘c’ i.e., 3rd molar is the last to appear in secondary dentition


Q. 8

All are true about permanent teeth, except:  

MP 11

 A

Ridge is present between neck and body

 B

Anterior teeth are inclined forward

 C

Roots of molars are larger

 D

They are ivory white in color

Q. 8

All are true about permanent teeth, except:  

MP 11

 A

Ridge is present between neck and body

 B

Anterior teeth are inclined forward

 C

Roots of molars are larger

 D

They are ivory white in color

Ans. A

Explanation:

Ans. Ridge is present between neck and body


Q. 9

First permanent tooth to arise:

AP 10; UPSC 11; Delhi 11

 A

Incisor

 B

Canine

 C

Premolar

 D

Molar

Q. 9

First permanent tooth to arise:

AP 10; UPSC 11; Delhi 11

 A

Incisor

 B

Canine

 C

Premolar

 D

Molar

Ans. D

Explanation:

Ans. Molar

Quiz In Between


Q. 10

The period of mixed dentition is between the age of:

UP 11

 A

2-9 years

 B

6-11 years

 C

12-14 years

 D

16 years

Q. 10

The period of mixed dentition is between the age of:

UP 11

 A

2-9 years

 B

6-11 years

 C

12-14 years

 D

16 years

Ans. B

Explanation:

Ans. 6-11 years


Q. 11

Number of permanent teeth at 8 years:

JIPMER 12

 A

6

 B

8

 C

12

 D

16

Q. 11

Number of permanent teeth at 8 years:

JIPMER 12

 A

6

 B

8

 C

12

 D

16

Ans. C

Explanation:

Ans. 12


Q. 12

False with regard to permanent teeth is:           

TN 08

 A

Molars erupt around 6 years

 B

Dentigerous cyst is common in canines

 C

There are 16 permanent teeth at the age of 10 years

 D

3rd molars eruption is variable

Q. 12

False with regard to permanent teeth is:           

TN 08

 A

Molars erupt around 6 years

 B

Dentigerous cyst is common in canines

 C

There are 16 permanent teeth at the age of 10 years

 D

3rd molars eruption is variable

Ans. B

Explanation:

Ans. Dentigerous cyst is common in canines


Q. 13

Age of eruption of Permanent 1st molor ‑

 A

6 years

 B

8 years

 C

10 years

 D

12 years

Q. 13

Age of eruption of Permanent 1st molor ‑

 A

6 years

 B

8 years

 C

10 years

 D

12 years

Ans. A

Explanation:

Ans. is ‘a’ i.e., 6 years

Quiz In Between



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