1020 occlusion

Occlusion

Max/mand contact when mand completely closed

Ideal occlusion

Class 1, max/mand 1/3 facially, max distal to mand 1/2, L max cusps in mand fossa- F mand cusps in max fossa, contacts can still change w/ bite

Normal occlusion

Not ideal but functional and comfortable, centric occ.

Centric occlusion

Voluntary position allowing maximum contact, where your teeth come together to chew

Arch development (perm)

1st molar, anterior, premolar, canine and 2nd molar, 3rd molar

Leeway space

From difference in size between prim and perm premolar

Curve of spee

Anteroposterior curve from incisal and occlusal surfaces- convex max, concave mand

Curve of Wilson

Lateral curve, concave curve from frontal section is taken through each set of molars

Centric stops/contacts

Height of cusp contour, marginal ridges, central fossa, indicated w/ articulating paper

Centric relation

(Jaw position) Most retruded mandible position in its fossa, controlled by muscle/ligament not occ., edentalous baseline, consistently reproducible

Protrusive occlusion

Forward movement of mandible = anteriors still touch

Lateral occlusion

Side to side mand movement creates working side, opp side is balancing, working canine rise or group function (canine + posteriors)

Mandibular rest position

Physiological mandibular rest, freeway space/ interocclusal clearance

freeway space/ interocclusal clearance

Average 2-3 mm between arches. Posture, fatigue, tension affect

Terminal plane

Molar alignment relationship

Flushed terminal plane

2nd molars are end-end

Mesial step plane

Mand 2nd molar is mesial to max (normal/ideal)

Distal step plane

Mand 2nd molar is distal to max (abnormal)

Malocclusion

Any deviation from ideal, minor- entire max/mand abnormal. Open, over bite, over let, cross, edge-edge

Overbite Jet

Horizontal space between max/mand ant in centric occ.

Edge-edge

Anterior teeth contact @ incisal edge, cusp-cusp posteriors, usually class lll

Individual tooth (single tooth in relation to others)

Bucco/labioversion, linguoversion, infraversion, supraversion, torsoversion (rotation)

Angle classification

Based on perm 1st molar and canines when biting, hypothesis-perm max 1st molar =occ. key, doesn't recognize arch size or diff bites, patient may have diff class on each side

Class I

Mesoganthic (normal) profile

Class ll

Max 1st molar is mesial to mand MB groove by at least premol width

Class ll division l

Retroganthic profile

Class ll division 2

Mesoganthic profile (normal)

Class Ill

Same as ll but opp. max is distal, underbite

Proximal contact areas (m/d)

Protect interdental papilla: gum tissue by preventing food impaction, stabilize teeth (no movement)

Parafunctional habits

Mand movement not normal = non functional

Bruxism

Clenching but grinding in diff directions

Clenching

Closing in centric occ w/ high force for long time

Thumb sucking

Can cause incomplete lip closure w/ max incisor protrusion