The document discusses the history and classification of articulators. It describes various types of articulators including mean value, semi-adjustable, and fully adjustable articulators. Key articulators mentioned include the Hanau, Whip Mix, and Denar articulators. Articulators are mechanical instruments that simulate jaw movements and are used for diagnosis, treatment planning, and the fabrication of dental restorations.
3. A mechanical instrument that represents the
temporomandibular joint and jaws, to which maxillary
and mandibular casts may be attached to simulate
some or all mandibular movements. (GPT-8)
Articulator
6. The first mechanical articulator
J B Garriot 1805
‘Gariot Hinge Joint
Articulator’
Hinges with a set screw
in the posterior
7. The Howarth Plaster Articulator 1830.
Plaster articulators
Two nested metal boxes held
in position and the hinge
movement was controlled with
elastics
8. The Barn door hinge articulator
Vertical stop at anterior end introduced
9. First to imitate mandibular movements –
but not successful
Daniel T Evans’ articulator 1840
11. Bonwill articulator
1858
Bonwills theory of occlusion
New century articulator
George B Snow
Adjustable condylar paths and
tension spring
Acme articulator (1906)
Straight condylar path
Adjustable condylar inclination
Provision for Bennett
movement.
15. Hagmen balancer
1925
Designed according to
Monson’s Spherical
theory.
Functioning head- 4’’
above occlusal plane
Occlusal plane- base of
isosceles triangle
16. Hanau Model H-110
1926 : Hanau
Individual condylar guidance
adjustments
Lateral setting was calculated
by : L=H/8+12
Hanau Model H-110 modified
o Similar to H-110 except that
it had an incisal guide table
instead of incisal guide cup
18. Bergstorm articulator
Arcon instrument
Hanau H had similar
features
accept facebow record,
uses protrusive
interocclusal record and
has curved condylar
guides.
19. Transograph (1952)
Split axis instrument designed
to allow each condylar axis to
function independently of each
other
Depends on Hinge axis-
adjustment
Ney articulator- (1962)
Dr. A. J DePietro
Arcon
no locking device between
the upper and lower members
for centric position
Gothic arch tracing
21. 1.Diagnosis, treatment planning and patient
presentation in both the natural and artificial
dentitions.
2.To plan dental procedures
3.To aid in the fabrication of dental
restorations and lost dental parts.
4. To correct and modify completed restorations.
5.Teaching and studying of occlusion and
mandibular movements.
Uses
22. Purposes
1. To hold the maxillary and mandibular casts in a
determined fixed relationship
2. Mounting of dental casts for diagnosis,
treatment planning and patient presentation.
3. To simulate the jaw movement like opening and
closing and also border movements.
4. Fabrication of occlusal surfaces for dental
restoration.
5. Arrangement of artificial teeth for complete and
removable partial denture.
24. ..then why not use
it
Patient’s saliva, tongue, and cheeks
Shifting denture bases and resiliency of the
supporting tissues
Inability of humans to detect visually subtle
changes in motion
Visualization (lingual)
More chair time
25. Limitations
Error in tooling and errors resulting from metal
fatigue and wear.
Simulate but not duplicate the jaw movements.
Movements simulated are empty mouth sliding
motions, not functional movements.
Errors in jaw relation reproduced as errors in
denture occlusion.
26. Hold casts in correct
horizontal and vertical
position
Positive anterior stop
Accept face bow transfer
Open and close in hinge movement
and
allow for protusive &lateral motion
Moving parts should move
freely & be accurately
machined
Non moving parts should be
of rigid construction
Basic Requirements
27. Adjustable horizontal and lateral
condylar guide elementsAccept third point of reference
Terminal hinge position locking
device
Removable mounting plates
Adjustable incisal guide tableAdjustable Intercondylar width
of condylar elements.
Additional Requirements
28. Classification
Gillis (1926)
The adaptable or adjustable type
The average or fixed type.
Beck (1962)
Suspension instrument
Axis instruments
Tripod instruments
29. Posselt (1968)
a) Plain line or simple hinge.
b) Mean value types
c) Adjustable types:
Semi adjustable : Posterior
control mechanisms- set by
interocclusal positional records e.g.
Hanau, Dentatus.
Fully adjustable : set by 3
dimensional pantographs e.g. Denar.
30. Sharry ( 1974 )
Simple
Hinge type
Fixed guide type
Adjustable
Kingery (1934)
Simple articulators and
Adjustable or adaptable articulators.
33. Articulators based on geometric theories of
mandibular movements
Bonwill’s
Equilateral theory
Monson’s
spherical theory
Hall’s conical
theory
34. Bonwill theory of occlusion
4 inch distance between condyles and each
condyle and the incisor point
Allows lateral movement and movements only
in horizontal plane
4’’
4’’
35. Conical theory: (R E HALL)
Lower teeth move over surfaces of upper teeth
as over surface of a cone generating an angle of
45° with the central axis of the cone tipped 45°
to the occlusal plane.
Hall’s automatic articulator
36. Spherical theory of
occlusion
G.S.Monson
Surface of a sphere with
diameter of 8 inches
Monson’s maxillo
mandibular articulator
37.
38. Based on records
Those utilizing the inter occlusal records
Those using the graphic record adjustment
Those utilizing hinge-axis location for adjusting
the articulator.
39. Winkler’s classification
International Prosthodontic Workshop on
Complete Denture Occlusion at the
University of Michigan -1972.
Based on articulator’s function.
Class I
Single static registration
Slab articulators
Hinge-joint articulator-Gariot
Barn- door hinge
40. Class II
Permit horizontal as well as vertical motion
Class II- A
Based on average value
Will not accept a face bow transfer.
Gysi Simplex
41. Class II-B
Based on arbitrary theories of motion
Maxillo-mandibular instrument - Monson
42. Class II - C
Based on engraved records
House articulator
43. Class III
Simulate condylar pathways
Allow face bow transfer.
Class III A
Accept static protrusive registration
Example: Hanau Model H, H2, Dentatus,
Class III B
Accept static protrusive registration and
some lateral protrusive registration
Example: Panadent, Hanau 130-21
44. Class IV
Accept three dimensional dynamic
registrations.
Class IV- A
Condylar path - engraving registrations
TMJ articulator
Class IV - B
Condylar pathways - selectively angled and
customized by selection from variety of
curvatures/ modification/both.
Gnathoscope, Denar, Simulator.
45. Heartwell
Emphasized role of pantograph in record
registration
Class I
Will receive and reproduce stereograms
(pantograms)
McCollum Gnathoscope, Hanau Kinescope,
Ney Articulator, Stuart Gnathologic computer,
Denar D5A
46. Class II
Will not receive pantograph
Type 1- (Hinge) - can open and close in a
hinge movement.
Do not accept face bow.
Gariot , Barn Door hinge , Trubyte Simplex,
Bonwill
Type 2 (Arbitrary) - designed to adapt to
specific theories of occlusion
Monson, Transograph
47. Type 3 (Average) - designed to provide condylar
element guidance by means of positional
records, averages or mini-recorder systems.
Face bow can be used.
Example: House, Dentatus, Hanau, Whip-Mix,
Denar (Mark II, Omni model), TMJ, Panadent
Type 4 (Special) –
Designed and used primarily for complete
dentures.
Example: Kile Dentograph, Stansberry Tripod
48. Based on adjustability (Rihani A)
Non-adjustable
Semi-adjustable
Fully adjustable
Rihani A, Classification of articulator, J Prosthet Dent, 1980;43:344 – 347
49. Non adjustable articulators
Can open and close in a fixed horizontal
axis.
Fixed condylar path along which condylar
ball can be moved to simulate lateral and
protrusive jaw movement.
Incisal guide pins ride on an inclined plane in
a fixed inclination.
50. Semi adjustable articulators
Adjustable condylar and incisal guides
Capable of accepting face bow record.
Condylar guides - programmed from protrusive
and lateral records obtained from patient.
Adjustable condylar paths, incisal guide tables
and inter condylar distances. The degree and
ease of these adjustments differ.
Arcon Non-arcon
51. Arcon articulators
‘Arcon’ - Articulator and Condyle.
Bergstrom
Condylar element - lower member
Condylar guidance - upper
member mechanical analog of
glenoid fossa.
Advantages
Whip mix
Hanau university
series
53. Heinz O Beck et al in 1959
Evaluated the arcon concept of articulation and
concluded that no definite superiority could be
noted in the clinical evaluation of complete
dentures constructed on the arcon over the
condylar type of instruments
54. Lawrence A. Weinberg et al in 1963
Concluded that both the arcon & condylar
instruments produce the same motion
because condylar guidance is the result of the
interaction of a condylar ball on an inclined
plane. The only change is in the numbers
used to record the inclination
Lawrence A Weinberg et al,Arcon principle in the condylar mechanism of
adjustable articulators,J Prosthet Dent,1963; 13(2):263–268
55. Fully adjustable articulators
Allows mandibular movement
in all directions
Instead of condylar guidance ,
receptacles in which acrylic
dough can be contoured to
form a customized condylar
and incisal guidance
Stuart instrument
Gnathoscope, Simulator
57. Mean value articulator
Upper member can
be moved upward
and backward .
Condylar inclination
of 30 degrees on
both side .
Anterior part is
supported by the
incisal guide rod
above and incisal
guide table below
with 10 to 15
inclination.
58. Stephens Class II
Hinge movement
Limited lateral movement.
Some -set screw- posterior- hold
frames in a fixed vertical position
Others -anterior pin
In Complete dentures when non-
cusp teeth- indicated
59. Stuart Articulator
Records and repeats the positions in
three planes
Mandibular movements are recorded
by magnetically controlled ball point
styli
Recorder is locked at centric relation
60. Whip Mix articulators
1963 by Charles Stuart
Easily mount the casts
Original model is 8500
Inter Condylar distance-
removable condylar guidance
spacer
Narrowest distance-96mm
Intermediate -110mm
Widest distance-124mm
61. Whip Mix articulators
Model 9000 is similar to 8500- except the lower
frame is ½ inch taller to provide more space for mounting
the mandibular cast
Model 8800 (steep plane of occlusion and osseous
defects)
Model 9800
62. Whip Mix articulators
DB 2000, DB 2200, 2240
Posterior viewing and access
space ↑
Interframe distance increased
to 114mm
Quick action centering latch
system
Bilateral heavy elastics
2240 – Accumount system
63. Denar articulators
Dr. Niles Guichet
Current model – D5A
Adjustments to the guidance surfaces are possi-
ble in all three planes of space
Denar reference plane locator and marker -
locating the reference points.
Adjustable metal incisal table and custom incisal
platform.
64. Hanau articulators
Introduced by Rudolph Hanau
Model H
Designed for complete dentures
The condylar elements are a part of the upper
frame and fixed at 110 mm.
The condylar elements functioned in a slot type
guidance mechanism adjustable from -40 to
+80 degrees.
The side shift adjustments range from 0° to 20°
and progressive in nature.
65. Non adjustable
Hanau-mate average type articulator
Semi adjustable
Series 96 H 2 Articulator
Wide-Vue Arcon
The 130 university series
Modular Articulator System
66. Hanau-mate average type
articulator
Non-adjustable, Arcon
Condylar guidance - 30°
Built-in average Bennett
Angle - 15°
Removable upper member
to speed wax ups.
67. Model 96H2
Semi-Adjustable, Non-Arcon
Intercondylar distance - fixed at
110mm
Bennett angle-0 to 300
Adjustable Incisal guide
Bennett movement- L=H/8+12
68. Wide-Vue Model 183 and 184
Arcon in nature
In 184 upper and lower
frames can be separated
Horizontal condylar path
angle -20 to +60 °
Bennett angle- 0-30°
70. Hanau wide vue articulators
Condylar guidance
Control centers
Condylar track may be
adjustably inclined on the
horizontal transverse axis
from 0 to +60° or to a -20°
(Protrusive inclination)
Condylar track adjusted on
vertical axis from 0 to 30 °
(Progressive Bennett angle)
71. Closed condylar track-
prevents accidental
disengagement of the
upper member.
Fixed centric stop
Limits condylar element
movement
Centric lock
Arrest condylar element at
centric position
72. Dual end incisal pin :
Chisel edge
Spherical tip
Vertical stop
Provides a stylus contact
for excursive movements
73. Adjustable incisal guide
Central guiding table is
5.56mm wide
0 to 60° (protrusive
inclination) – AP
Lateral wings: 0 to 45°
74. Orbital indicator
Represents infra orbital
notch
Provides vertical
orientation for the upper
arch
79. “It must be recognized that the person operating the
instrument is more important than the instrument.
If dentists understand articulators and their
deficiencies, they can compensate for their
inherent adequacies.”
- Carl O Boucher
80. References
Arthur O. Rahn, Charles M. Heartwell, Text book of
complete denture, 5th edition, Febiger Publications,
Pennysylvania, pp 59-106.
Sheldon Winkler, Essentials of complete denture
prosthodontics, 2nd edition, pp 142- 183
Edgar N. Starck, The History of Articulators: From
Facebows to the Gnathograph, a Brief History of Early
Devices Developed for Recording Condylar Movement:
Part I, J Prosthodont, 2001;10(4):241-248
Edgar N. Starck, The History of Articulators: Pursuing the
Evolution of the Incisal-Pin and Guide, Part II, J
Prosthodont, 2001;10(2):113-121
81. Edgar N. Starck, The History of Articulators: A Critical History
of Articulators Based on Geometric Theories of Mandibular
Movement, Part III:The “Balancer” Designs, J Prosthodont,
2002;11(4):305-320
Awni Rihani, Classification of articulator, J Prosthet Dent,
1980; 43:344 – 347
K. Chandrasekharan Nair, Rediscovering Complete
Dentures, 1st edition, 33-44
Hanau manual
Lawrence A Weinberg et al,Arcon principle in the condylar
mechanism of adjustable articulators,J Prosthet Dent,1963;
13(2):263–268
Ashish R Jain, Articulators through the years revisited : From
1700 to 1900- Part I, WJD,2015;6(4):222-225
Ashish R Jain, Articulators through the years revisited: From
1900 to 1950- Part II, WJD,2016;7(1):23-31
Ashish R Jain, Articulators through the years revisited: From
1751 to 1970- Int J Pharm Bio Sci 2016 July ; 7(3): (B) 880 -
Editor's Notes
It is often said “patient’s mouth is the best articulator”. The primary function of articulator is to act as a patient. it is not practical and convenient to work exclusively in the patient’s mouth at all times, thus, articulators have been designed to enable the dental surgeon and technician to study the patient’s dentition and construct the prosthesis without the continued presence of the patient.
The mechanical Hinge articulators were capable of functioning only in a vertical movement. Hence, a need to invent articulators that could imitate the mandibular movement arose. Fixed descending condylar path : as downward movement of the mandible was observed during mandibular excursions.
Gritman articulator : 15 degree, an average determined by measurements taken from a large number of patients.
‘Dentist’s Guide’. For the first time, there is a mention of provision for protrusive and lateral movements.
e use of a protrusive interocclusal wax record to measure the angle of the condylar paths that he believed corresponded to the observed space, and to use this record to set the condylar controls of an adjustable articulator. Christensen’s procedure was a major contribution and is likely the origin of the intraoral (checkbite) method for recording mandibular movement. observation of the space that occurs between the maxilla and mandible during protrusion.
The Bonwill’s theory of occlusion–teeth move in relation to each other as guided by the condylar control and the incisal poin
Tension spring for greater range of movement.
Mean value articulator. Alfred Gysi : was probably the 1st to have an incisal pin & guide assembly.
Designed to reproduce all ranges of mov so as to determine and restore mand path of occlusion. The operating mechanism of the Balancer was a single ball and socket (universal) joint called the “functioning head”, from which was suspended a pendulum holding the maxillary cast mounting plate by vertical sleeve
The Hanau Model H110, which was introduced by Hanau in 1926, was designed primarily for complete dentures. The articulator evolved from the Model Hl15 that was manufactured in 1922 and 1923. It has individual condylar guidance adjustments in both the sagittal and the horizontal planes. Rather than using lateral positional records, the lateral setting is calculated by dividing the horizontal condylar inclination by 8 and adding 12.
the instrument will reproduce not only the positions on movement paths but the actual path themselves. It was designed for use with the gnathograph, an extraoral device for tracing mandibular movements.
Bergstrom in 1950 designed an arcon articulator. He was the first to use the term ‘Arcon’ (Ar-articulator, concondyle). In this articulator condylar guides are on upper member and condylar elements are on lower member. It can accept facebow record, uses protrusive interocclusal record and has curved condylar guides.
Later on hanau h2 series and whipmix and denar articulators were introduced The Ney articulator is an arcon insirument with no locking device between the upper and lower members for centric position. The condylar elements can be set to varying intercondylar distances
Patient co-operation is not a factor
Mechanical instrument made of metal, some of plastic material.no provision to indicate or correct the errors of occlusion
According to this theory the teeth move in relation to each other as guided by the condylar controls and incisal points. since the condylar guides are not adjustable, it permits movements only in horizontal plane.
Upper membrane moves antero-posteriorly & medio-laterally . Monsoon associated bonwill’s triangle with his own observation & formulated his spherical theory.The condylar path & the occlusal plane form a curve which is part of an 8inch sphere, the centre of which is the common centre of mandibular motion.This sphere touches the apices of the bonwill triangle.
mandibular teeth move over the maxillary teeth as over the surface of a sphere with a diameter of 8 cm in radius, the center of which is located in the region of glabella and the surface of the sphere passes through the glenoid fossa along the articulating eminences or concentric with them
monson believed that all jaw movements take place around 2 axes. 1 axis runs through the common center & the other is located around the condylar axis.
His articulator has shafts that correspond to the respective axes.
Most accepted and widely used
Needles House chew in method
Min basic requirement for prosthodontic work
Better visualization & understanding of mandibular movements
Condyles move in a relationship to their condylar housing that is similar to the way the condyles move in relationship to the glenoid fossae in the skull. This makes visualization and understanding of condylar movements easier. The motion resulted from the action of a condylar ball on an inclined plane and reversing their relationship did not change the motion.
Uses: fabrication of small restorations and for prosthesis repairs, for complete dentures when non-cusp teeth are indicated
Record the amt and character of movement in one plane in relation to other planes
Arcon.for better diagnosis of occlusion of natural teeth. The intercondylar distance is adjustable to three positions: small (S), 96 mm; medium (M), 110 mm and large (L), 124 mm by means of a removable condylar guidance spacers along the instruments horizontal axis
model 9000 is similar to model 8500, except the lower frame is ½ inch taller to provide more space for mounting the mandibular cast. Some dentists prefer this for complete dentures. The Whip Mix Model 8800 Articulator provides an additional ½ inch space to mount the maxillary cast. This is more suitable in situations with extremely steep plane of occlusion or when osseous defect exists in the maxilla.
Model 9800 combines the upper frame of model 8800 with the lower frame of model 9000 to provide the greatest distance between the upper and lower frames
A quick action centering latch system is part of the new design. It precisely centers the upper and lower frames to each other.
elastics
(1) prevent separation of the upper and lower frames during excursive movements;
(2) maintain the orbiting condylar element against the medial wall of the condylar assembly during a lateral movement;
(3) tend to return the condylar element back to CR after releasing lateral movement pressured;
2240 features the Accumount system, which allows interchanging of mounted casts between other 40 series
Anatomic landmarks are used with many articulators and techniques to establish the posterior and anterior reference points. The Denar Reference Plane Locator and Marker is useful for this purpose. With it the anatomic points usually can be relocated precisely
Wide Vue I has a closed condylar track (does not allow upper member to be removed) and Wide Vue II has an open condylar track.
. It represents the slopes of articular eminence in the skull which guides the movement of the condyles. The condylar element moves along the inclines of the condylar guidance and together determines the protrusive and lateral movements of the articulator.