Module 2 Occlusion and angles classifications (6) and Bone and TMJ anatomy (7)

When evaluating a patients occlusion what tooth relationship do we observe?

• we observe the canine to canine relationship and the 1st-molars relationship

What does a normal occlusion describe?

• the contact relationship of the mandibular arch and the the maxillary arch

• the teeth are in maximum conact and spaced normally

What does a normal and healthy occlusion look like?

• the maxillary anterior teeth overlap the insical edge of the mandibular anterior teeth by 2mm

• Maxillary posterior teeth are one cusp distal to the manndibular posterior teeth

• Max canine is slightly behind the mandibular canine cusp

• Mandibular 1st molar mesial cusp is in the groove of the mandibular 1st molar

What is Malocclusion?

• any deviation/ difference from normal occlusion

• cna include the missalignment of only one tooth, a group of teeth, or an entire arch

What is Angles Clasification?

• A system made to classify occlusion and malocclusion

• Made by Dr. EDWARD ANGLE

Describe Class I

• is also known as Neutroclusion

• Is when the cusp of the max. canine occludes between the distal of the mand. cuspid and mesial of the mand. 1st molar

• Is when the mesial buccal cusp of the Max.1st molar occludes with the buccal groove of the mand. 1st molar

• Patient has a MESOGNATHIC profile

Describe Class II

• Is also known as Distocclusion

• Is when the distal of the madibular canine is distal to the maxillary canine

• Is when the MB cusp of the max. 1st molar occludes after/ mesial to the groove of the mand. 1st molar

• The max. anteriors may be more slanted inwards or outwards

• Patient may have a mesognathic retrognathic profile

Describe class III

• also known as mesioclusion

• Is when the distal of the mand. canine is mesial tot he max. canine (mand. canine is one tooth mesial tot he max. canine)

• Is when the MB cusp of max. 1st molar is distal/ behind the groove of the mand. 1st molar

• patient has a prognathic profile

What is a formen?

an opening in bone

What is a fossa?

a depression/ hollow area

What is a process?

A projection or a prominence of bone

What is a suture?

a non-moving joint of two bones

What is a tubercle/tuberosity?

a rounded process

What is a Sinus?

A cavity or space within bone

What are the 8 bones of the Cranium?

• Frontal

• Parietal (x2)

• Occipital

• Temporal (x2)

• Sphenoid

• Ethmoid

What are the 14 bones of the face?

• Zygomatic (x2)

• Maxillary (x2)

• Palatine (x2)

• Nasal (x2)

• Lacrimal (x2)

• Vomer

• Inferior Conchae (x2)

• Mandible

What is the TMJ?

• where the mandible meets the temporal bone

• provide the lower jaw movement of opening and closing, sideways, and foward and backwards

What are symptoms of people with TMJ disorders

• Pain

• Sounds in the joint: Crepitus

• Limited movement

What is TMJ disorders caused by?

• Stress

• Bad oral habits: Bruxism, grinding, clenching

• Accidents/ injury

• Joint disease

• Mallocclusion