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Jaw Movements & Articulators. Jaw Movements. Opening. Opening. Opening. Opening. Posselt’s Figure. Posselt’s Investigations. Posselt’s Investigations. Posselt’s Figure. Posselt’s Figure. MP. ICP. RCP. HA. MP = Maximal protrusion ICP = Intercuspal position

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Presentation Transcript
slide1

Jaw Movements

&

Articulators

slide15

Posselt’s Figure

MP

ICP

RCP

HA

MP = Maximal protrusion

ICP = Intercuspal position

RCP= Retruded Contact position

HA = Hinge axis

MO = Maximum opening

MO

definitions
Definitions
  • Articulators
    • A mechanical representation of the jaws and temporo-mandibular joints
use of articulators
Use of articulators
  • Diagnosis
    • slides and occlusal relationships
  • Treatment planning
    • Diagnostic wax - up
    • Occlusal adjustment
  • Fabrication of Splint / Prostheses
articulators
Articulators
  • Types
    • Simple Hinge
    • Average Value
    • Semi-adjustable
    • Fully adjustable
articulators2
Articulators

BONWILL 1854

4”

4”

articulators3

4”

4”

Articulators
  • Average Value
articulators4
Articulators
  • Average Value
dentatus
Dentatus
  • Non Arcon
denar ii
Denar II
  • Adjustable Condylar Angle, ISS & PSS
articulators6
Articulators
  • Semi-adjustable
  • Can alter;
  • TMJ to Incisor distance
  • Bennett Angle
  • Condylor Guidance Angle
  • Incisal guidance plate
articulators7
Articulators
  • Needs Facebow recording
  • Ideally should be used for complete denture cases
facebow recording
Facebow recording

For semi adjustable articulator

fully adustable denar 5
Fully adustable: Denar 5
  • Posterior wall
  • Superior wall
  • Medial wall
  • Inclination of superior wall
  • Condylar angle
  • Intercondylar (& glenoid fossa) distance
  • ISS
pantographic recording
Pantographic recording

For fully adjustable articulator

slide41

lots

Difficulty

of

use

none

Av

Value

Fully

Adjustable

Hand

Held

S-A

slide42

lots

Amount of adjustment

none

Av

Value

Fully

Adjustable

Hand

Held

S-A

slide43

lots

Cost

none

Av

Value

Fully

Adjustable

Hand

Held

S-A

slide44

Articulator use vs time vs cost

lots

lots

Amount of adjustment

Difficulty

of

use

Cost

none

none

Av

Value

Fully

Adjustable

Hand

Held

S-A

articulators9
Articulators

Therefore the distance from the condyle to the teeth is crucial

We obtain a measurement of this distance with a facebow

interocclusal record
Interocclusal record
  • Used to locate the lower model to the upper
  • If lots of good stable occlusal contacts then no IOR needed
  • If need an RCP record, then we need an IOR that is thick and strong enough to obtain a record with the teeth separated and in terminal hinge axis e.g. Moyco Extra Hard Beauty wax
  • For routine ICP records when carrying out multiple crowns / bridgework, Blu-mousse just over the tooth preps is usually sufficient
aids to obtaining tha
Aids to obtaining THA
  • Bimanual manipulation
  • Cotton wool rolls
  • Anterior “jig”
  • Splint therapy
  • Chin-point guidance
anterior jig
Anterior jig
  • Cold-cure acrylic (Duralay/Trim)
  • Greenstick
anterior jig trimmed
Anterior jig (trimmed)
  • Provides inclined plane

Separation of posterior teeth

Allows the use of easy flowing

occlusal recording media

such as Blu-Mousse

anterior jig1
Anterior Jig

From Howatt, Capp & Barrett

clinically useful settings for articulator
Clinically useful settings for articulator
  • Condylar angle 25°
  • Immediate side shift 0.3mm
  • Progressive side shift 6°
incisal guidance table
Incisal guidance table
  • Allows shape of palatal to be reproduced
  • Allows length of incisors to be maintained
slide62

Tooth to be prepped

Shape created is

the inverse of Posselt’s figure

summary
Summary
  • The choice of articulator depends upon such factors as;
    • Intended use - Skill of the technician
    • Availability of equipment - Expense
    • Patient's occlusion - Skill of the operator
    • The more closely the articulator matches the patients anatomy, usually the better the outcome and the less adjustment is required at chairside on fitting prostheses.