Occlusion

Question 1

RESTORATION ISSUES = overload teeth

Answer 1

1. Premature contacts/ Interference = rest left too high (shiny amalgam indicates high spot)
   o Fremitus = tap teeth, tooth vibrates > neighbouring
   o Continual low grade trauma
    PDL inflam, pain on biting
    PDL widens
    Mobility+drifting
2. Lateral forces on Posterior teeth = pre/molars designed for vertical
3. Excessive forces from Parafunction = bruxism, habits use muscles > chewing
    ↑wear, fracture rest, muscle pain, microcracks

• Conformative treatment = to existing occlusion, same bite, avoid issues
• Reorganised treatment = △ occlusion

Question 2

ANATOMY

Answer 2

• Ascending ramus = masseter inserts
• Coronoid process = temporalis m inserts
• Condylar process = jaw hinge
• Zygomatic arch
• Glenoid fossa = condyle inserts  articular eminence guides

Question 3

Occlusion Biting

Answer 3

• Freeway Space = resting 2-4mm
• Inter-cuspal Pos = max interlock of teeth
• Retruded Contact Pos = closing, 1st contact

Question 4

Occlusal schemes

Answer 4

1. Canine guidance = contact in working side
2. Group function = 2+ teeth contact  wear

Question 5

Occlusal Positions

Answer 5

• Open = terminal hinge axis, digastric m, rotation 20mm  translation, lateral pterygoid
• Close = temporalis m  masseter+medial pterygoid m clenches
• Protrude = condylar guidance
• Lateral = lateral pterygoid, working side moves direction, non orbits

Question 6

Articulator

Answer 6

o ICP
o Occlusal scheme
o Evidence parafunctional habits
o Extraoral = m palpation, tender to p
o Palpate TMJs open+close, click+grind