removable- prosthesis - articulator - قسم الاستعاضه الصناعيه

4. Opening

5. Opening

6. Opening

7. Opening

12. Posselt’s
Figure

13. Posselt’s Investigations

14. Posselt’s Investigations

15. Posselt’s Figure

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

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

19. Definitions
Articulators
– A mechanical representation of the jaws and
temporo-mandibular joints

20. Use of articulators
Diagnosis
• slides and occlusal relationships
Treatment planning
• Diagnostic wax - up
• Occlusal adjustment
Fabrication of Splint / Prostheses

21. Articulators
Types
– Simple Hinge
– Average Value
– Semi-adjustable
– Fully adjustable

22. Articulators

23. Cast Holder

24. Cast Holder

25. Average Value

26. Articulators
4”
4”
BONWILL 1854

27. Articulators
Average Value
4”
4”

28. Articulators
Average Value

29. Articulators

30. Denar II - Arcon

31. Dentatus
Non Arcon

32. Denar II
Adjustable Condylar Angle, ISS & PSS

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

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

35. Facebow recording
For semi adjustable articulator

36. Fully adustable: Denar 5
Posterior wall
Superior wall
Medial wall
Inclination of superior wall
Condylar angle
Intercondylar (& glenoid fossa) distance
ISS

37. Denar 5a

40. Pantographic recording
For fully adjustable articulator

42. Difficulty
of
use
Hand
Held
Av
Value
S-A Fully
Adjustable
lots
none

43. Hand
Held
Av
Value
S-A Fully
Adjustable
Amount of adjustment
lots
none

44. lots
Cost
Hand
Held
Av
Value
S-A Fully
Adjustable
none

45. Articulator use vs time vs cost
lots
Difficulty
of
use
Cost
Hand
Held
Av
Value
S-A Fully
Adjustable
Amount of adjustment
none
lots
none

46. What if patient doesn’t match
articulator?
Articulator
Patient

47. Articulators

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

49. Facebow

53. 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

54. Aids to obtaining THA
Bimanual manipulation
Cotton wool rolls
Anterior “jig”
Splint therapy
Chin-point guidance

55. Anterior jig
Cold-cure acrylic (Duralay/Trim)
Greenstick

56. Anterior jig (trimmed)
Provides inclined plane
Separation of posterior teeth
Allows the use of easy flowing
occlusal recording media
such as Blu-Mousse

57. Anterior Jig
From Howatt, Capp & Barrett

58. Clinically useful settings for
articulator
Condylar angle 25°
Immediate side shift 0.3mm
Progressive side shift 6°

59. Incisal guidance table
Allows shape of palatal to be reproduced
Allows length of incisors to be maintained

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

64. Following tooth prep

65. Tooth form reconstructed

66. 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.