Mandible

Question 1

Symphysis boundaries

Answer 1

Lateral roots of central incisors

Question 2

Parasymphysis boundaries

Answer 2

Lateral roots of central incisors up to lateral root of canines

Question 3

Standard surgical incision to mandible

Answer 3

Transoral vestibular

Question 4

Where is intraoral incision placed

Answer 4

8-10mm from junction of attached and mobile mucosa

Question 5

Type of incision for edentulous patients

Answer 5

Crestal

Question 6

When to do transcutaneous approach

Answer 6

Preexisting lacerationsSignificant comminution or bone lossDifficult repositioning needing visualization of lingual aspect.

Question 7

Type of screw used for superior plate

Answer 7

Monocortical*bicortical or monocortical may be used for inferior plate

Question 8

Which is applied first after occlusion is established?

Answer 8

Tension band plate then compression Or IDW then compression

Question 9

<p>Miniplate osteosynthesis: Type of Fixation</p>

Answer 9

<p>Semi rigid</p>

Question 10

Miniplate osteosynthesis: Type of Fixation

Answer 10

Semi rigid

Question 11

Length of time for postop soft diet after miniplate osteosynthesis

Answer 11

4 weeks

Question 12

Do compression plate osteosynthesis and lag screw osteosynthesis require soft diet?

Answer 12

No, both are functionally stable

Question 13

How long does chin area have to be taped post op? Why?

Answer 13

2-3 days*to avoid swelling that may lead to dehiscence and secondary soft tissue healing

Question 14

Other method to immobilize soft tissues post op apart from taping

Answer 14

IMMF

Question 15

Body boundaries

Answer 15

Lateral to canine, anterior to 3rd molar

Question 16

Angle boundaries

Answer 16

Third molar region and junction of body and ramus

Question 17

T or F: Angle of mandible is thicker inferiorly

Answer 17

F: THINNER

Question 18

6 muscles attached to mandible and location

Answer 18

Mylohyoid mylohyoid ridge, lingualMedial pterygoid medial inferior borderMasseter lateral inferior border / angleBuccinatorlateral border, ext oblique ridgeTemporalis coronoid processSuperior constrictor medial to angle

Question 19

Afferent nerves (3) and supply

Answer 19

Inferior alveolar nerve - mental nerve, lip chin teethLingual nerve - 1-2mm medial to int oblique ridge, FOM Tongue, sensation and taste to ant 2/3Long buccal nerve - crosses ant ramus above the angle, sensation to cheek and buccal vestibule

Question 20

Motor supply of mandibular region

Answer 20

V3 - musc of mastication/mylohyoid/ant digastricVII- facial expression, marginal (depressors of lip - located 1cm beneath antegonial notch of the angle, and cervical branches in submandibular triangle

Question 21

Blood supply to body and angle (2)

Answer 21

Inf alveolar arteryPeriosteal plexus

Question 22

Draw the limits of the coronoid condyle subcondylar area and ramus

Answer 22

perpendicular lines LOOK IT UP p 159 Prein

Question 23

Gold standard diagnostics for fractures of the coronoid condylar head

Answer 23

CT

Question 24

Standard treatment for fractures of the atrophic mandible

Answer 24

Load bearing osteosynthesis (reconstruction plate or locking reconstruction plate with bicortical screw placement to carry the functional load)

Question 25

Most common screw sites for load bearing osteosynthesis in atrophic mandibles

Answer 25

The angle and symphysis typically provide the screw sites *due to better bone quality and quantity

Question 26

Reasons for decreased bone viability in edentulous and atrophic mandibles

Answer 26

Diminished vascularity, no load bearing capacity, brittle