Ortho/Pedo

Question 1

A moment is ……

Answer 1

measure of tendency to rotate around the center of resistance

Question 2

The only force possible with a couple is …….

Answer 2

rotation around the center of resistance

* Regardless of where the couple (bracket) is applied

Question 3

Functional appliance are used to ………

Answer 3

correct class II malocclusion

Question 4

Head gear provides both

Answer 4

anchorage and traction

* It modifies the growth of the maxilla

Question 5

Endodontically treated teeth are subject to ……. when moved endodontically

Answer 5

root resorption

Question 6

Hyrax differs from Haas appliance in that Hyrax …….

Answer 6

doesn’t have an acrylic base
* Note: Haas has two bands, one on the first premolar, the second on the first molar on each side. While Hyrax has on band on the first molar only

Question 7

Unlike functional cross bite, skeletal cross bite shows …….

Answer 7

smooth closure to centric occlusion

Question 8

Class III malocclusion is more common in ………

Answer 8

asians

Question 9

In orthodontic treatment planning, the priorities are …..

Answer 9

impacted teeth first, then interarch relation, followed by intra arch relation

Question 10

A flat mandibular plane angle indicates ………., while a steep plane angle indicates ……..

Answer 10

short anterior face with anterior deep bite

long anterior face with anterior open bite

Question 11

Normal maxillary/mandibular plane angle value is …….

Answer 11

27 ( +/- 4 )

* Greater value indicates longer lower anterior face height

Question 12

Longer face predisposes the patient to …….., while short face ……..

Answer 12

CL II

CL III

Question 13

Cephalometric is useful for assessing …….

Answer 13

bone-bone, tooth-tooth, and tooth-bone relationship

Question 14

Supracrestal fibrotomy is most commonly performed on ………

Answer 14

Max. lateral incisors

Question 15

Time elapsed between the extractions of serial exo is ……..

Answer 15

6-15 months

Question 16

Full time retention after ortho treatment should last for ……..

Answer 16

4 months

* after that, a 1 year partial time retention is preferred

Question 17

Lymphoid tissue reaches %200 size at age …., then declines. Major tissues reach their max at ….., while genital tissue starts growth at ……..

Answer 17

12
20
14
* Note: Neural tissue reaches %90 size at age 9

Question 18

The growth of the Maxilla follows the growth of ……, while the Mandible growth follows ……..

Answer 18

the neural tissue
gential tissue
* Peak of growth for girls is 12, and boys 14
* The earlier the growth peak, the shorter the growth period, and the less the growth

Question 19

The clefting of lip/palate prevalence is …

Answer 19

1 of 700 - 1000 births

Question 20

Permanent teeth move …….. & …….. while erupting

Answer 20

occlusaly and buccaly

Question 21

Light ortho forces causes …….

Answer 21

frontal resorption, and faster movement

Question 22

The premature loss of mand. primary canines indicates …….

Answer 22

insufficient arch size in the anterior region

* Crowns of permanent lateral incisor impinge on the roots of the primary canines, causing their resorption

Question 23

Malocclusion is more identifiable at the age of ……….. due to ………

Answer 23

7 - 9 years

due to eruption of incisors, which reveal the arch - tooth size discrepancy

Question 24

The nasolabial angle is …..

Answer 24

the angle between the base of the nose and the upper lip. Should be perpendicular or obtuse

Question 25

SN - GoGn angle mean is ......

Answer 25

32.0

Question 26

Bimaxillary dentoalveolar protrusion appears as .....

Answer 26

incompetent lips lips strain prominent lips in the profile view

Question 27

Thumb sucking, if stopped before mixed dentition, will ......

Answer 27

not lead to malocclusion

Question 28

Mand. primary second molar erupts in ..... in relation to its Max. counter part

Answer 28

flush-terminal relation | * The mand. second molar is larger M-D than its upper counterpart

Question 29

Late mesial shift occurs at the age of .......

Answer 29

10 years | * CL II relationship will occur if late shift doesnt occur

Question 30

Leeway space is .... in the Max. and .... in the Mand.

Answer 30

3 5 * Measured for primary canine, first & second molar

Question 31

There's an increase in vertical face height in girls at age ......

Answer 31

17 | * for boys at 20

Question 32

There's a DECREASE in arch length during the late adolescent due to .....

Answer 32

late mesial shift of molars into leeway space

Question 33

N2O in excess of ..... is contraindicated in pedo dentistry

Answer 33

50% | * Note: O2 must be 30% minimum

Question 34

........ is the most commonly used premed prior to GA

Answer 34

versed

Question 35

MAC for N2O is ......

Answer 35

104% | * It is the concentration needed to produce immobility in 50% of patients

Question 36

Ectodermal dysplasia is .....

Answer 36

sex linked recessive | * more in males

Question 37

Most common solid tumors of childhood is ......

Answer 37

neuroblastoma * originates in the adrenal medulla or other sites of the sympathetic system * Most common site is the abdomen

Question 38

The ...... arch is underdevloped in pituitary dwarvism

Answer 38

mandible

Question 39

ADHD is treated with ......

Answer 39

ritalin, concerta, adderall

Question 40

In low conc., fluoride inhibits .....

Answer 40

glucosyltransferase & intracellular polysaccharides formation

Question 41

Cause of death from fluoride toxicity is ......

Answer 41

heart failure and respiratory paralysis

Question 42

Most commonly missed primary tooth is ......

Answer 42

maxillary lateral incisor

Question 43

Cementum is ........ in children

Answer 43

thinner * Cementum thickness increases with age * Also in children: wider PDL, flatter alveolar crest, greater pocket depths, less attached gingiva

Question 44

.......... has a large mesial marginal ridge that resembles a cusp

Answer 44

Primary mand. first molar * also has a large transverse ridge from MB to ML * Has a distinctive occlusal pattern "H"

Question 45

Formocresol can be diluted to ...... of original for pulpotomy

Answer 45

20% strength | * other fixative agents: ferric sulfate and gluteraldehyde

Question 46

What is the treatment for a primary tooth with necrotic pulp after trauma (no fracture)?

Answer 46

RCT if necessary (symptomatic) otherwise, leave it alone

Question 47

Interglobular dentin is found in ........

Answer 47

dentin near the DEJ * It is less mineralized than globular dentin * Evident especially when there's a disturbance in calcification (like Dentinogenesis imperfecta)

Question 48

Finger spring can be used with ....... appliance to close maxillary diastema

Answer 48

Hawley arch

Question 49

The intersphenoidal synchondrosis becomes inactive at age .......

Answer 49

3 yrs | * The sphenoethmoidal stops at age 7