Dentoalveolar

Question 1

Most common teeth to be impacted

Answer 1

Maxillary and mandibular third molars

Question 2

Most common impacted teeth other than third molars

Answer 2

Maxillary canines

Followed by mandibular premolars, maxillary premolars, and second molars

Question 3

Syndromes associated with impacted teeth

Answer 3

Cleidocranial dysplasia

Down syndrome

Question 4

Systemic deficiencies associated with impacted teeth

Answer 4

Endocrine deficiencies (hypothyroidism, hypopituitarism)

Question 5

Mandibular third molar tooth germ is usually visible radiographically by what age?

Answer 5

9 yrs

Question 6

Mandibular third molar crown and root formation ages?

Answer 6

Crown formation age 14
Roots 50% formed by age 16
Roots usually completely formed with open apex by age 18

Question 7

95% of all third molars that will erupt will have completed eruption by what age?

Answer 7

Age 24

Question 8

Indications for removal of impacted third molars (9)

Answer 8

1. Periodontitis
2. Pericoronitis
3. Dental caries
4. Orthodontic considerations
5. Odontogenic cysts/tumors
6. Root resorption of adjacent teeth
7. Teeth underlying dental prostheses
8. Prevention of jaw fx
9. Management of unexplained pain

Question 9

Most common reason for removal of impacted third molars after age 20

Answer 9

Pericoronitis

25-30% of impacted third molars are extracted because of pericoronitis.

Question 10

True/false? Anterior incisor crowding is associated with mandibular third molars?

Answer 10

False. Evidence suggests impacted third molars are not a significant cause of postorthodontic anterior crowding. Anterior crowding is more associated with deficient arch length.

Question 11

Ideal wait time for removal of mandibular third molars prior to mandibular osteotomy?

Answer 11

6-12 months

Question 12

Incidence of cyst/tumor development around impacted third molar?

Answer 12

3%

Usually seen in patients younger than 40. May decrease with age.

Question 13

General contraindications for removal of impacted teeth (3)

Answer 13

Advanced patient age
Poor health
Surgical damage to adjacent structures

Question 14

Age at which impacted tooth should not be remove if it is completely covered in bone without communication with the oral cavity and no sign of pathology.

Answer 14

Age 40

Question 15

Optimal time for uprighting a molar tooth?

Answer 15

2/3 of the root is formed

Question 16

Percentage of impacted tooth presentations

Answer 16

Mesioangular (45%)
Vertical (40%)
Horizontal (10%)
Distoangular (5%)

Question 17

What determines degree of difficulty of surgery to remove an impacted tooth (2)?

Answer 17

1. Depth of impact ion and type of overlying tissue

2. Age of the patient

Question 18

Findings of Miloro study on lingual nerve position in relation to third molar? (JOMS 1997)

Answer 18

Mean vertical from crest 2.75mm
Mean horizontal from crest 2.53mm
25% in direct contact w lingual plate
10% superior to lingual crest

Question 19

Postsurgical swelling usually reaches peak when?

Answer 19

By the end of the second postoperative day

Question 20

Most important determinant of the amount of postoperative pain that occurs?

Answer 20

Length of the operation

Question 21

Incidence of dry socket after removal of impacted mandibular third molars

Answer 21

3-25%

Question 22

Name two demographics with higher incidence of dry socket

Answer 22

1. Smokers

2. Females taking oral contraceptives

Question 23

Pathogenesis of alveolar osteitis

Answer 23

Lysis of a fully formed blood clot before the clot is replaced with granulation tissue. 3-4 days post op.

Question 24

If maxillary third molar is displaced into infratemporal fossa and unable to be retrieved initially?

Answer 24

Allow for fibrosis and return for removal in 2-4 weeks