Articulator

1. Articulators
Dr.Himanshu Tiwari
Senior Lecturer
Dept. Of Prosthodontics
and crown and bridge

2. Jaw Movements

8. MP
MO
ICP
RCP
HA
MP = Maximal protrusion
ICP = Intercuspal position
RCP= Retruded Contact position
HA = Hinge axis
MO = Maximum opening
Posselt’s Figure

9. Posselt’s Figure – top
edge
RCP
ICP
IG
EE
MP

10. Articulators

11. Articulators
◼ A mechanical representation of the jaws and
temporo-mandibular joints

12. Diagnosis
● slides and occlusal relationships
Treatment planning
● Diagnostic wax - up
● Occlusal adjustment
Fabrication of Splint / Prostheses

13. Types
◼ Simple Hinge
◼ Average Value
◼ Semi-adjustable
◼ Fully adjustable

18. 4”
4”
BONWILL 1854

19. Average Value
4”
4”

20. Average Value

23. Non Arcon

24. Adjustable Condylar Angle, ISS & PSS

25. Semi-adjustable
Can alter;
•TMJ to Incisor
distance
•Bennett Angle
•Condylor Guidance
Angle
•Incisal guidance plate

26. •Needs Facebow
recording
•Ideally should be used
for complete denture
cases

27. For semi adjustable articulator

28. Posterior wall
Superior wall
Medial wall
Inclination of superior wall
Condylar angle
Intercondylar (& glenoid fossa) distance
ISS

29. Articulator
Patient

31. Therefore the distance from the condyle to the teeth is crucial
We obtain a measurement of this distance with a facebow

36. Bimanual manipulation
Cotton wool rolls
Anterior “jig”
Splint therapy
Chin-point guidance

37. Cold-cure acrylic (Duralay/Trim)
Greenstick

38. From Howatt, Capp & Barrett

39. Condylar angle at saggittal plan30 and lateral
guidance 15 °
Immediate side shift 0.3mm
Progressive side shift 6°

40. Allows shape of palatal to be reproduced
Allows length of incisors to be maintained

44. Tooth to be prepped
Shape created is
the inverse of Posselt’s figure

45. Following tooth prep

46. Tooth form reconstructed

47. 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.

48. Key note messages
▣ 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.

49. Thank You