PAR scoring and definitions

Question 1

What are the 5 components of PAR and their weightings?

Answer 1

Upper and lower anterior segments x 1
Right & Left buccal segments x 1
Overjet and reverse overjet x 6
Overbite and openbite x 2
Centerlines x 4

Question 2

What is PAR used for?

Answer 2

Used to measure the success of treatment.

Question 3

How is PAR calculated?

Answer 3

Total for component x weighting factor = weighted total

Question 4

What is a good standard of treatment?

Answer 4

70%

Question 5

How do we assess the improvement of PAR?

Answer 5

Record the start PAR, finish PAR and reduction in PAR as a percentage

Use a Nomogram to plot the pre treatment and post treatment values.

Question 6

How is the percentage reduction worked out?

Answer 6

(Reduction PAR divided by starting PAR) X 100 = percentage reduction

Question 7

What is hypodonita?

Answer 7

Congenital absence of one or more primary or secondary teeth.

Question 8

What is oligodonita?

Answer 8

More than 6 missing teeth

Question 9

What is anodonita?

Answer 9

Total loss of teeth

Question 10

What is impaction?

Answer 10

Failure of eruption of a tooth due to crowding or an obstruction within the dental arch

Question 11

What is a deepbite?

Answer 11

Vertical overlap of upper incisors over lower incisors when posterior segment is in occlusion. Upper incisors overlap lower incisors in excess of 4mm or more.

Question 12

What is a normal overbite?

Answer 12

Upper incisors cover one third of lower incisors with posterior segment in occlusion.

Question 13

What is an increased overbite?

Answer 13

Upper incisors cover more than one third of lower incisors when posterior segment in in occlusion

Question 14

What is a decreased overbite?

Answer 14

Upper incisors cover less than one-third of lower incisors when posterior segment is in occlusion

Question 15

What is an incomplete overbite?

Answer 15

Lower incisors do not come into contact with hard or soft tissues

Question 16

What is a complete overbite?

Answer 16

Lower incisors come into contact with hard or soft tissues.

Question 17

What is an anterior openbite?

Answer 17

No vertical overlap of the upper and lower incisors when posterior segment is in occlusion

Question 18

What is a posterior openbite?

Answer 18

No vertical overlap of upper and lower posterior teeth when posterior segment teeth are in occlusion

Question 19

What is a crossbite?

Answer 19

An abnormal relationship between opposing teeth in buccopalatel or buccolingual direction

Question 20

What is a posterior crossbite?

Answer 20

Buccal cusps of lower teeth occlude buccal to buccal cusps of upper teeth when patient is in full occlusion

Question 21

What is an anterior crossbite?

Answer 21

One or more of the maxillary incisors occlude lingual to lower incisors with posterior teeth in occlusion

Question 22

What is a lingual crossbite?

Answer 22

Buccal cusps of lower teeth occlude palatal to palatal cusps upper teeth when patient in full occlusion

Question 23

What is an overjet?

Answer 23

Distance between upper and lower incisors in horizontal plane. Normal overjet is 2-4mm

Question 24

What is bimaxillary proclination?

Answer 24

Occlusions where both upper and lower incisors are proclined.

Question 25

What is the center of resistance?

Answer 25

Point in the body where resistance to movement is concentrated

Question 26

What is force moment?

Answer 26

The component found within a force that causes rotational movement.

Question 27

What is force couple?

Answer 27

In fixed appliances, when an archwire connects into a bracket slot a force couple is created, which will achieve rotation, inclination of teeth and torque.

Question 28

What is another version of PAR?

Answer 28

ICON - Index treatment complexity outcome and need