Dr Balendra pratap singh
BDS, MDS, MAMS, FISDR, FPFA, FAAMP, ICMR-IF
Assistant Professor
Department of Prosthodontics
King George’s Medical University, Lucknow
Posselt’s Figure
MP
ICP
RCP
HA
MP = Maximal protrusion
ICP = Intercuspal position
RCP= Retruded Contact position
HA = Hinge axis
MO = Maximum opening
MO
Posselt’s Figure – top edge
MP
ICP
IG
RCP
EE
Articulators

A mechanical representation of the jaws and
temporo-mandibular joints
Diagnosis
•
slides and occlusal relationships
Treatment planning
•
•
Diagnostic wax - up
Occlusal adjustment
Fabrication of Splint / Prostheses
Types
Simple Hinge
 Average Value
 Semi-adjustable
 Fully adjustable

BONWILL 1854
4”
4”
Average Value
4”
4”
Average Value
Non Arcon
Adjustable Condylar Angle, ISS & PSS
Semi-adjustable
Can alter;
•TMJ to Incisor distance
•Bennett Angle
•Condylor Guidance
Angle
•Incisal guidance plate
•Needs Facebow
recording
•Ideally should be used
for complete denture
cases
For semi adjustable articulator
Posterior wall
Superior wall
Medial wall
Inclination of superior wall
Condylar angle
Intercondylar (& glenoid fossa) distance
ISS
Articulator
Patient
Therefore the distance from the condyle to the teeth is crucial
We obtain a measurement of this distance with a facebow
Bimanual manipulation
Cotton wool rolls
Anterior “jig”
Splint therapy
Chin-point guidance
Cold-cure acrylic (Duralay/Trim)
Greenstick
From Howatt, Capp & Barrett
Condylar angle at saggittal plan30 and lateral
guidance 15 °
Immediate side shift 0.3mm
Progressive side shift 6°
Allows shape of palatal to be reproduced
Allows length of incisors to be maintained
Tooth to be prepped
Shape created is
the inverse of Posselt’s figure
Following tooth prep
Tooth form reconstructed
The choice of articulator depends upon such
factors as;




Intended use
Availability of equipment
Patient's occlusion
- Skill of the technician
- Expense
- 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.


No articulator is best and no one can record all
jaw movements
Articulator can try to record only jaw
movements not reproduced anatomy of joint.