Epidemiolgy

Question 1

What is Prevalence

Answer 1

Number of new cases/number of population

Question 2

What is Incidence

Answer 2

Number of new cases in specified time/population initially disease free

Usually small expressed as /100,000

Question 3

Cross sectional study

Answer 3

Population at 1 given time have or not

Good for prevalence info

Question 4

Cohort Study

Answer 4

Follows over time
All start free of disease
Can be expensive and long

Question 5

Case control Studies

Answer 5

Good for rare disease
One time studying people who have died ease
Cheap and quick

Question 6

Index

Answer 6

Numerical value describing relative status with definite upper and lower limits

Used compare other populations

Question 7

What is validity

Answer 7

Measures what it was intended to

Question 8

What is practicality

Answer 8

Cheap and easy to use

Question 9

Reliability

Answer 9

Consistently measure the same even with different examiners

Question 10

Quantifiability

Answer 10

Measurements are meaningful and capable of statistical analysis

Question 11

Sensitivity

Answer 11

Ability to identify condition being measured

Question 12

Clarity

Answer 12

Scoring criteria clear

Question 13

Simplicity

Answer 13

Easy to use in field

Question 14

Objectivity

Answer 14

Capable of being applied without operator bias

Question 15

Acceptability

Answer 15

Comfortable and non threatening to the subject

Question 16

Gingivitis and periodontitis are both cause by

Answer 16

Inflammation response of the immune system

Question 17

Plaque index (Silness and Loe)
0.
1.
2.
3.

Answer 17

0 no plaque
1 no visible can be seen w/ sweep
2 mild to moderately visible at gingival level
3 heavy plaque filling gingival crease

Question 18

Simplified oral hygiene index

0

1

2

3

Answer 18

0 no debris or stain

1 covers 1/3 of surface

2. Debris or stain covers 1/3 to 2/3 of surface
3. More than 2/3