Ranjikar Occlusion and other lectures

Question 1

What is the most common nightguard location?

Answer 1

Upper teeth just because the lower molars have asmall undercut thus the nightguard might be thin there!

Both jaw nightguard can be made for quite bad bruxism!

Question 2

What are the reasons for a nightguard?

Answer 2

1. Protection of tooth structure or restorative work
2. TMD - used to relief of head pain

Question 3

What are the two types of nightguards?

Answer 3

1. Full occlusal coverage nightguard - ramp and none ramp nightguard
2. Anterior coverage

Question 4

What is the different structures of a nightguard?

Answer 4

1. Hard
2. Soft
3. Bilaminar

Question 5

Give a summery of an upper nightguard construction.

Answer 5

1. Clinic appt 1 - alginate impression & bite record - use laboratory instructions
2. Send it to the lab
3. Clinic app 2 - insert nightguard & adjust occlusion

Question 6

How to write a lab prescription form for a nightguard construction?

Answer 6

1. Fill all the blank areas
2. In the special instruction write “Please construct an upper dual laminated nightguard using bite record provided”
3. Sign it and ask tutor to sign it

Question 7

What is surveying a cast?

Answer 7

It is a process of drawing lines on a rock cast in order to mark out the undercut of the teeth. Undercut is needed to maintain stability for rempros and fixedpros

Question 8

How do you check a nightguard?

Answer 8

1. Fit - stability and retention
2. Thickness
3. Occlusion - check with articulating papper and get an acrylic burs

Remember to show hot to insert and remove, store and clean the nightguard.

Remember to tell the patient that they might have some sleep disturbances and soreness at the start.

Review at net appoitment.

Question 9

What is sleep bruxism?

Answer 9

It is involuntary clenching and grinding of the teeth that occurs during the sleep. It usually associated with stress.

Question 10

What is sleep apnoe?

Answer 10

A potentially serious sleep disorder in which breathing repeatedly stops and starts. Please repeat the Gen Med Lectures.

Question 11

What are the three types of muscles of the body?

Answer 11

1. Smooth
2. Skeletal
3. Cardiac

Question 12

What are isotonic contraction and isometric contraction?

Answer 12

1. Isotonic contraction - tension remains the same but length changes while chewing
2. Isometric contraction - tension increase but length remains the same - clenching

Question 13

What is tetany?

Answer 13

It is an involuntary muscle contraction. Like when you have done a good gym session and your legs shake.

Question 14

Please review the following slide

Answer 14

Question 15

Please review the following slide

Answer 15

Question 16

What is origin and insertion of masseter muscles?

Answer 16

Origin: Zygomatic arch

Insertion: Mandible angle and mandible ramus

Question 17

What is the origin and insertion of the temporalis muscles?

Answer 17

Origin: Temporal fossa

Insertion: Mandible coronoid process

Question 18

What is the origin and insertion of medial pterygoid muscles?

Answer 18

Origin: Maxillary tuberosity

Insertion: Medial surface of mandible angle

Question 19

What is the origin and insertion of the lateral pterygoid muscles?

Answer 19

Origin: Infratemporl crest of greater wing of sphenoid bone

Insertion: Pterygoid fovea on Mandible condyle anterior neck

Question 20

What are the unique features of the TMJ?

Answer 20

1. One side can not move without the movement of the other
2. Rigid end point of closure - stop point
3. Composed dense fibrous tissue for chewing

Question 21

What is the role of Meckel’s cartilage and TMJ?

Answer 21

Meckel’s cartilage acts as the initial hinge in the embryological development.

Meckel cartilage disappears with the development of TMJ structures and forms the bones of the ear.

Question 22

What are the main components of the TMJ?

Answer 22

1. The mandibular fossa and articular turbecle on the cranium
2. Articular disc in between
3. Mandibular head or condyle on the mandible

Question 23

What is the role of articulating disk in the TMJ?

Answer 23

It moves along with the condyle and protect the condyle from the rough surface of the mandibular fossa - it work like a cushion.

Question 24

What is the role of synovial fluid?

Answer 24

To reduce friction between the articular cartilages of synovial joints during movement

Question 25

What is the name of the ligament in TMJ?

Answer 25

It is the TMJ ligament that prevents the joint to be displaced

Question 26

What is the normal opening of the mouth?

Answer 26

Around 35-40 mm

Question 27

What supplies the TMJ with blood?

Answer 27

Main the maxillary artery

Question 28

What is parafunction? What is an example of occlusal parafunctions?

Answer 28

Parafaction means non-functional - example in the the occlusion is bruxism or biting on foreign objects

Question 29

What is the main cause of nocturnal bruxism?

Answer 29

It is usually related to stress and emotional struggle

Question 30

What is diurnal bruxism?

Answer 30

Bruxism during the day

Question 31

What are the disadvantages and advantages of Angle’s Molar Classification?

Answer 31

Advantages - universal system of assessing occlusion

Disadvanatagaes - does not take into the account the mandibular position