1. DENTAL ARTICULATORS

2. Dental articulator is a mechanical device which represents the TMJ and the jaw members to which maxillary and mandibular casts may be attached to simulate some or all jaw movements

3. Purposes Of An Articulator
Hold maxillary and mandibular casts in a determined fixed relationship
To produce Hinge, lateral and protrusive movements

4. Uses Of An Articulator To diagnose occlusion
Correct and modify artificial restorations
To find out the relation between natural & artificial teeth
Arrangement of artificial teeth

5. Requirements Of An Ideal Articulator
Should hold cast in correct horizontal &vertical relationship
Should open &close in hinge movement
Moving parts should move freely &non moving parts should be rigid
Should accept face-bow
Should be made of non corrosive material.

6. Limitations of articulators
Articulators may show errors due to metal fatigue
Articulators may not exactly simulate mandibular movements
Articulators can not detect errors in jaw relations

7. Classification Of Dental Articulators
Here we are going to discuss classification based on the ability to simulate jaw movements
*Simple articulator
**Mean – value articulator
***Semi-adjustable articulator
**** Fully adjustable articulator

8. Simple Articulator
Able to accept a single static registration. Only vertical movement is possible.
Can be used when a tentative jaw relation is done (for diagnostic purposes)

10. Mean Value Articulator (Average-Value Articulator)
Permits horizonal and vertical but not orient motions to TMJ
The condylar path is fixed in the order of 30 degree
Has incisal pin guide which helps to hold the articulator open at a definite position
Suitable for patients having condylar path around 30 degree

12. Semi-adjustable Articulator (Hanau articulator)
Include adjustable incisal guide table
Face-bow to relate casts to hinge movements
Horizontal path can be registered
Lateral movement can be calculated

13. Hanau Articulator
Semi-adjustable articulator, holds condylar sphere in upper member and condylar element in lower member
Horizontal condylar guidance can be adjusted through protrusive movemet
Lateral movement is calculated :
L = H/8 + 12

15. Mounting the casts
Mounting is to attach casts to articulator
*Adjust articulator
*Prepare the casts
*Transfer maxillary cast
*Mounting of mandibular cast and adjust horizontal condylar guidance

16. Fully adjustable Articulator
Accept 3dimension movements
To simulate mandibular movements
More accurate restorations are possible on these instruments
(complicated &needs long time)

18. Arcon Articulator
condylar sphere in lower member and condylar element in upper member
Non arcon articulator
condylar sphere in upper member and condylar element in lower member

19. Face- bows
Caliper instrument used to (orient the maxillary cast to cranium)
Arbitary
*conventional
**Ear piece (external auditory meatus)
Kinematic
Commonly used in fixed prosthodontics

23. JAW RELATIONS Vertical dimension of rest (VDR)
Vertical dimension of occlusion
(VDO)
Intero-cclusal distance (free way space)

25. RVD – OVD = Interocclusal space
Equations
VD = RVD & OVD
Always RVD >OVD
RVD – OVD = Interocclusal space
Freeway space = 2-4mm.

27. Centric relation (bone to bone)
&Eccentric relation
Centric occlusion (tooth to tooth)
Condylar path
Condylar guide inclination

28. Thank u