Ranjikar Occlusion and other lectures Flashcards
What is the most common nightguard location?
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!
What are the reasons for a nightguard?
- Protection of tooth structure or restorative work
- TMD - used to relief of head pain
What are the two types of nightguards?
- Full occlusal coverage nightguard - ramp and none ramp nightguard
- Anterior coverage
What is the different structures of a nightguard?
- Hard
- Soft
- Bilaminar
Give a summery of an upper nightguard construction.
- Clinic appt 1 - alginate impression & bite record - use laboratory instructions
- Send it to the lab
- Clinic app 2 - insert nightguard & adjust occlusion
How to write a lab prescription form for a nightguard construction?
- Fill all the blank areas
- In the special instruction write “Please construct an upper dual laminated nightguard using bite record provided”
- Sign it and ask tutor to sign it
What is surveying a cast?
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
How do you check a nightguard?
- Fit - stability and retention
- Thickness
- 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.
What is sleep bruxism?
It is involuntary clenching and grinding of the teeth that occurs during the sleep. It usually associated with stress.
What is sleep apnoe?
A potentially serious sleep disorder in which breathing repeatedly stops and starts. Please repeat the Gen Med Lectures.
What are the three types of muscles of the body?
- Smooth
- Skeletal
- Cardiac
What are isotonic contraction and isometric contraction?
- Isotonic contraction - tension remains the same but length changes while chewing
- Isometric contraction - tension increase but length remains the same - clenching
What is tetany?
It is an involuntary muscle contraction. Like when you have done a good gym session and your legs shake.
Please review the following slide
Please review the following slide
What is origin and insertion of masseter muscles?
Origin: Zygomatic arch
Insertion: Mandible angle and mandible ramus
What is the origin and insertion of the temporalis muscles?
Origin: Temporal fossa
Insertion: Mandible coronoid process
What is the origin and insertion of medial pterygoid muscles?
Origin: Maxillary tuberosity
Insertion: Medial surface of mandible angle
What is the origin and insertion of the lateral pterygoid muscles?
Origin: Infratemporl crest of greater wing of sphenoid bone
Insertion: Pterygoid fovea on Mandible condyle anterior neck
What are the unique features of the TMJ?
- One side can not move without the movement of the other
- Rigid end point of closure - stop point
- Composed dense fibrous tissue for chewing
What is the role of Meckel’s cartilage and TMJ?
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.
What are the main components of the TMJ?
- The mandibular fossa and articular turbecle on the cranium
- Articular disc in between
- Mandibular head or condyle on the mandible
What is the role of articulating disk in the TMJ?
It moves along with the condyle and protect the condyle from the rough surface of the mandibular fossa - it work like a cushion.
What is the role of synovial fluid?
To reduce friction between the articular cartilages of synovial joints during movement
What is the name of the ligament in TMJ?
It is the TMJ ligament that prevents the joint to be displaced
What is the normal opening of the mouth?
Around 35-40 mm
What supplies the TMJ with blood?
Main the maxillary artery
What is parafunction? What is an example of occlusal parafunctions?
Parafaction means non-functional - example in the the occlusion is bruxism or biting on foreign objects
What is the main cause of nocturnal bruxism?
It is usually related to stress and emotional struggle
What is diurnal bruxism?
Bruxism during the day
What are the disadvantages and advantages of Angle’s Molar Classification?
Advantages - universal system of assessing occlusion
Disadvanatagaes - does not take into the account the mandibular position
