articulator
TRANSCRIPT
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Opening
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Opening
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Opening
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Opening
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Posselt’s Figure
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Posselt’s Investigations
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Posselt’s Investigations
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Posselt’s Figure
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MP
MO
ICPRCP
HA
MP = Maximal protrusionICP = Intercuspal positionRCP= Retruded Contact position HA = Hinge axisMO = Maximum opening
Posselt’s Figure
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Posselt’s Figure – top edge
RCP
ICP
IG
EE
MP
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Definitions
Articulators– A mechanical representation of the jaws and
temporo-mandibular joints
Articulators– A mechanical representation of the jaws and
temporo-mandibular joints
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Use of articulators
Diagnosis• slides and occlusal relationships
Treatment planning • Diagnostic wax - up• Occlusal adjustment
Fabrication of Splint / Prostheses
Diagnosis• slides and occlusal relationships
Treatment planning • Diagnostic wax - up• Occlusal adjustment
Fabrication of Splint / Prostheses
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Articulators
Types
– Simple Hinge– Average Value– Semi-adjustable– Fully adjustable
Types
– Simple Hinge– Average Value– Semi-adjustable– Fully adjustable
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Articulators
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Cast Holder
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Cast Holder
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Average Value
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Articulators
4”
4”
BONWILL 1854
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Articulators
Average ValueAverage Value
4”
4”
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Articulators
Average ValueAverage Value
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Articulators
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Denar II - Arcon
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Dentatus
Non ArconNon Arcon
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Denar II
Adjustable Condylar Angle, ISS & PSSAdjustable Condylar Angle, ISS & PSS
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Articulators
Semi-adjustable
Can alter;• TMJ to Incisor
distance• Bennett Angle• Condylor Guidance
Angle• Incisal guidance plate
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Articulators
• Needs Facebow recording
• Ideally should be used for complete denture cases
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Facebow recording
For semi adjustable articulator
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Fully adustable: Denar 5
Posterior wall
Superior wall
Medial wall
Inclination of superior wall
Condylar angle
Intercondylar (& glenoid fossa) distance
ISS
Posterior wall
Superior wall
Medial wall
Inclination of superior wall
Condylar angle
Intercondylar (& glenoid fossa) distance
ISS
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Denar 5a
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Pantographic recording
For fully adjustable articulator
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Difficultyofuse
HandHeld
AvValue
S-A FullyAdjustable
lots
none
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HandHeld
AvValue
S-A FullyAdjustable
Amount of adjustment
lots
none
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lots
Cost
HandHeld
AvValue
S-A FullyAdjustable
none
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Articulator use vs time vs cost
lots
Difficultyofuse
Cost
HandHeld
AvValue
S-A FullyAdjustable
Amount of adjustment
none
lots
none
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What if patient doesn’t match articulator?
Articulator
Patient
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Articulators
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ArticulatorsTherefore the distance from the condyle to the teeth is crucial
We obtain a measurement of this distance with a facebow
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Facebow
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Interocclusal recordUsed 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
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
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Aids to obtaining THA
Bimanual manipulation
Cotton wool rolls
Anterior “jig”
Splint therapy
Chin-point guidance
Bimanual manipulation
Cotton wool rolls
Anterior “jig”
Splint therapy
Chin-point guidance
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Anterior jig
Cold-cure acrylic (Duralay/Trim)
Greenstick
Cold-cure acrylic (Duralay/Trim)
Greenstick
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Anterior jig (trimmed)
Provides inclined planeProvides inclined plane
Separation of posterior teethAllows the use of easy flowingocclusal recording mediasuch as Blu-Mousse
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Anterior Jig
From Howatt, Capp & Barrett
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Clinically useful settings for articulator
Condylar angle 25°
Immediate side shift 0.3mm
Progressive side shift 6°
Condylar angle 25°
Immediate side shift 0.3mm
Progressive side shift 6°
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Incisal guidance table
Allows shape of palatal to be reproduced
Allows length of incisors to be maintained
Allows shape of palatal to be reproduced
Allows length of incisors to be maintained
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Tooth to be prepped
Shape created isthe inverse of Posselt’s figure
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Following tooth prep
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Tooth form reconstructed
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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.
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.
![Page 66: Articulator](https://reader034.vdocument.in/reader034/viewer/2022042815/557211e1497959fc0b8fa3a4/html5/thumbnails/66.jpg)