Articulators
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com
www.indiandentalacade...
Contents
 Introduction
 History
 Classification
 Requirements
 Uses
 Advantages
 Selection of instruments
 Arcon V...
 Modified incisal guide pins
 Articulators in market
 Care and maintance
 Conclusion
 References
www.indiandentalacad...
 Articulating anything is like carving a
statue. While sculpting, sculptor does not
add clay, actually he keeps chiseling...
Introduction
 Definition:
A mechanical instrument thatA mechanical instrument that
represents the temporomandibular joint...
History
www.indiandentalacademy.com
Plaster Articulator-
Philip Pfaff (1756)
A plaster extension on
distal portion of
mandibular cast was
grooved to serve as ...
Barn door hinge articulator.
J.B Gariot (1805)
Also called as “plain-line
articulator”.
No provision for anterior
vertical...
Daniel T. Evens articulator(1840)
Synonym “Dentist’s Guide
Features:
Provision for protrusive and lateral
movements.
Also ...
Bonwill articulator
( 1858)
Features:
Allows lateral
movement,(eccentric
movements) and
permits movement only
in the horiz...
Richmond Hayes
Articulator(1889)
Features :
Has a fixed descending
condylar path and has non
adjustable condylar
elements....
Grittman Articulator(1899)
Features :
This has a Descending condylar
paths of 15 degrees.
Permits eccentric motion based o...
Gysi –Articulator(1812)
Features:
 It is an “average value”
instrument.
 Condylar paths 33 degrees
 Lateral paths 16 de...
Gysi Trubyte Articulator
(1930)
Features :
Simple plain-line and average
articulator .
An adjustable instrument adaptable
...
Christensen’s articulator(1905)
Features:
To measure the angle of the condylar paths (by protrusive
records) .
Christensen...
 The term Christensen’s phenomenon
coined by Ulf Posselt
 It had been previously described by
Balkwill in 1866
www.india...
Luce articulator(1911)
Features:
Provision for recording
eccentric motion based on
engraving.
It has posterior and incisal...
Mandibulo-Maxillary
Instrument (1923)
By George Monson.
Based on spherical theory of
occlusion.
Have slot screws that can ...
Stansbery Tripod
Articulator(1929)
Designed without a hinge to
facilitate the reproduction of any
positional set relations...
House Articulator (1930)
Features:
Permit eccentric motion based on
engraved records.
Accepts records by means of
Needle H...
Page’s Transograph
(1952)
Split axis instrument .
Allows each condylar
housing to function
independently of the other
www....
Hanau Model M kinescope
(1923)
It has double condylar
posts.The inner posts serve 2
purposes
They act as horizontal condyl...
Hanau Model H110
(1926)
Accepts face bow transfer.
Horizontal condylar
inclinations are set by
means of a protrusive
inter...
Hanau Model H110
Modified(1927)
Similar to H110 except that
it had an incisal guide table
instead of incisal guide
cap.
Ad...
Hanau Crown and
Bridge
articulator(1934)
Small articulator requires no
face bow.
Has a posterior pin and
guidance mechanis...
Hanau Model H2
Series(1958)
There was an increased
distance between upper
and lower members from
95mm to 110 mm.
Accepts f...
Hanau H2 Series
•Hanau model H2-O with orbital
indicator attachment.
•Model H2-X with extendable
condylar shafts.
•Model H...
Hanau Radial Shift (1981)
 Condylar guidance of
the articulator is
designed to incorporate
a curved immediate
side shift ...
Hanau Wide Vue(1983)
Lingual visibility is
unobstructed
Dual End Incisal
Pin
Wide Vue 2-
Open condylar track.
www.indiande...
TMJ ARTICULATORS -Kenneth Swanson (1965)
This is now a versatile system.
It accepts custom fossa
analogs that are formed f...
Classification of ArticulatorsClassification of Articulators
 Based on Theories of OcclusionBased on Theories of Occlusio...
 International prosthodontic workshop onInternational prosthodontic workshop on
complete denture occlusion (1972)complete...
Classification based on THEORIES of
OCCLUSION
 Bonwill’s theory of occlusion
 Conical theory of occlusion (R.E.Hall )
 ...
BONWILL’S THEORY OF
OCCLUSION
 Bonwill introduced
(1864) -“Theory of
Equilateral Triangle”
 4" (10 cm ) distance
occurs ...
CONICAL THEORY OF OCCLUSION
 R.E.HALL (1915) proposed that
 Lower teeth move over the surface of
the upper teeth as over...
www.indiandentalacademy.com
SPHERICAL THEORY OF OCCLUSION
(Monson 1918)
 Monson proposed that
 Lower teeth moves over the surface of the
upper teeth...
• The center of the sphere
is located in the region of
Glabella and the surfaces
of the sphere passes
through the Glenoid ...
Gillis (1926), Boucher (1934), Kingery
(1934)
 ADJUSTABLEADJUSTABLE
 NON ADJUSTABLENON ADJUSTABLE
www.indiandentalacadem...
BECK’S (1962) :
 Suspension instrumentSuspension instrument
 Axis instrumentAxis instrument
 Tripod instrumentTripod in...
WEINBERG (1963))
 ARBITRARY (Monson spherical theory)
 POSITIONAL (Stansbery tripod concept)
 SEMI ADJUSTABLE (Hanau H ...
POSSELT’S (1968)POSSELT’S (1968)
 Plain line Articulator
 Mean value Articulator
 Adjustable Articulator
www.indiandent...
International workshop on Complete
Denture Occlusion (1972)
Based on
 Instruments function,
 Instrument capability,
 In...
Class I.
 Subdivision A
 Subdivision B
Class II.
 Subdivision A
 Subdivision B
 Subdivision C
Class III.
 Subdivisio...
 Subdivision A:
 Vertical motion is possible, but only
for convenience.
The Corelator (Denar Corp.)
The Verticulator (Je...
 Subdivision B:
 Vertical motion is joint related.
The Centric relator (Denar Corp)
www.indiandentalacademy.com
 CLASS II. ARTICULATOR
 An instrument that PERMITS Horizontal
as well as Vertical motion but does notdoes not
orientorie...
 Subdivision A:
 Eccentric motion permitted is based on
average or arbitrary values
 NO FACE-BOW TRANSFER.
Gysi Simplex...
 Subdivision B:
 Eccentric motion permitted is based
on theories of arbitrary motion.
 No Face-Bow Transfer.
Shofu Hand...
 Subdivision C:
 Eccentric motion permitted is determined
by the patient using engraving
methods/records.
 No face bow ...
 CLASS III. ARTICULATOR
 Simulate condylar pathways using
averages or mechanical equivalents
for all or part of the moti...
 Subdivision A:
 Accept STATIC PROTRUSIVE Registrations
and use equivalents for the rest of the
motion.
Dentatus articul...
 Subdivision B:
 Accepts STATIC LATERAL PROTRUSIVE
registrations and use equivalents for the
rest of the motion.
Panaden...
The Ney Articulator
Gysi Trubyte articulator,
Hanau 130-21
www.indiandentalacademy.com
www.indiandentalacademy.com
 CLASS IV. ARTICULATOR
 Accept three dimensional dynamic
registrations.
 Orientation of the casts to the
temporomandibu...
 Subdivision A:
 The cam representing the condylar paths
are formed by registration engraved by the
patient.
TMJ-Stereog...
www.indiandentalacademy.com
Stereograph (TMJ articulator)
www.indiandentalacademy.com
Denar Combi articulator
www.indiandentalacademy.com
 Subdivision B:
 Have condylar paths that can be
ANGLEDANGLED and CUSTOMIZEDCUSTOMIZED either by
selection from a variet...
Stuart Articulator
Denar D5A Articulator
www.indiandentalacademy.com
Stuart Pantograph
Denar Pantograph
www.indiandentalacademy.com
www.indiandentalacademy.com
Cyberhoby fully adjustable articulator
and Cyberhoby computer pantograph
www.indiandentalacademy.com
Requirements
 It should
Hold casts in correct horizontal and vertical
relationships.
Provide a positive anterior vertical...
Additional requirements
 Centric locking device
 Removable mounting plates that can be
positioned accurately.
 Adjustab...
Uses
 To diagnose dental occlusal conditions in both
natural and artificial conditions.
 To plan dental procedures that ...
Advantages
 Better visualization (lingual view)..
 Patient cooperation not critical once the
appropriate inter occlusal ...
Advantages of adjustable
articulators
 Balanced occlusion:
In any closed mandibular position,centric or
eccentric maxium ...
Contd
 Reduced trauma:
Minimum amount of damage to the supporting
tissue.
Functional movements
Balanced articulation allo...
Limitations
 The articulator is subject to error in tolling
and errors resulting from metal fatigue.
 The movements simu...
Selection of an articulator for
complete dentures
 If occlusal contacts are to be perfected in centric
relation only ,the...
contd
 These complicated articulators pose problems in
fabricating complete dentures because of the
resiliency of soft ti...
Parts of an Articulator
The movement of the frame of the
articulator is governed at three
points.
Posteriorly by the two c...
Condylar guidance
 It is the mechanical form located in the
upper posterior region that controls
movement of its mobile.
...
Importance
 Condylar path is determined by the distal slope
of the articular eminence.
 This path dis engages the teeth ...
negative condylar guidance
 When the inclination of central bearing
plate is greater than the axis path
inclination a neg...
Incisal guidance
 Anatomically
The influence of the contacting surfaces of
the mandibular and maxillary anterior
teeth on...
Incisal guide angle
 Anatomically
The angle formed by the intersection of the plane
of occlusion and a line within the sa...
Importance
 Angle of the incisal guidance table will markedly
affect the cusp angles,cusp height,overbite and
overjet.
 ...
Importance contd
 Make vertical overlap as lessas
possible.this is particularly true when the
mandible is atrophic and al...
Thank you
For more details please visit
www.indiandentalacademy.com
www.indiandentalacademy.com
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Articulators / fixed orthodontic courses

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Articulators / fixed orthodontic courses

  1. 1. Articulators INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Contents  Introduction  History  Classification  Requirements  Uses  Advantages  Selection of instruments  Arcon Vs Non-arcon www.indiandentalacademy.com
  3. 3.  Modified incisal guide pins  Articulators in market  Care and maintance  Conclusion  References www.indiandentalacademy.com
  4. 4.  Articulating anything is like carving a statue. While sculpting, sculptor does not add clay, actually he keeps chiseling the un-essential material until the truth is revealed.  Likewise though articulator is an important mechanical entity, in itself it is of no meaning unless occlusion obtained from it functions in the mouth in harmony with biologic factors that regulate the mandibular activity of the patient www.indiandentalacademy.com
  5. 5. Introduction  Definition: A mechanical instrument thatA mechanical instrument that represents the temporomandibular jointrepresents the temporomandibular joint and jaws, to which maxillary andand jaws, to which maxillary and mandibular casts may be attached tomandibular casts may be attached to simulate some or all mandibularsimulate some or all mandibular movement.movement.((GPT-8GPT-8)) www.indiandentalacademy.com
  6. 6. History www.indiandentalacademy.com
  7. 7. Plaster Articulator- Philip Pfaff (1756) A plaster extension on distal portion of mandibular cast was grooved to serve as a guide for plaster extension of maxillary cast. www.indiandentalacademy.com
  8. 8. Barn door hinge articulator. J.B Gariot (1805) Also called as “plain-line articulator”. No provision for anterior vertical stop.  Adaptable Barn door hinge articulator It has an anterior vertical stop. www.indiandentalacademy.com
  9. 9. Daniel T. Evens articulator(1840) Synonym “Dentist’s Guide Features: Provision for protrusive and lateral movements. Also had vertical stop feature . Limitations: Inconvenient and difficult to use. www.indiandentalacademy.com
  10. 10. Bonwill articulator ( 1858) Features: Allows lateral movement,(eccentric movements) and permits movement only in the horizontal plane. www.indiandentalacademy.com
  11. 11. Richmond Hayes Articulator(1889) Features : Has a fixed descending condylar path and has non adjustable condylar elements. www.indiandentalacademy.com
  12. 12. Grittman Articulator(1899) Features : This has a Descending condylar paths of 15 degrees. Permits eccentric motion based on average values. The condylar paths also include a slight Balkwill bennet angle to represent the average oblique descent of the condyle. www.indiandentalacademy.com
  13. 13. Gysi –Articulator(1812) Features:  It is an “average value” instrument.  Condylar paths 33 degrees  Lateral paths 16 degrees  First type to have an incisal pin and guide assembly www.indiandentalacademy.com
  14. 14. Gysi Trubyte Articulator (1930) Features : Simple plain-line and average articulator . An adjustable instrument adaptable to either extra oral or Intraoral records. Changeable inclined plane for the incisal rod. Provision for recording lateral movements www.indiandentalacademy.com
  15. 15. Christensen’s articulator(1905) Features: To measure the angle of the condylar paths (by protrusive records) . Christensen’s procedure is likely the origin of the intraoral (checkbite) method for recording mandibular movement. www.indiandentalacademy.com
  16. 16.  The term Christensen’s phenomenon coined by Ulf Posselt  It had been previously described by Balkwill in 1866 www.indiandentalacademy.com
  17. 17. Luce articulator(1911) Features: Provision for recording eccentric motion based on engraving. It has posterior and incisal path controls that were functionally generated in modeling plastic. www.indiandentalacademy.com
  18. 18. Mandibulo-Maxillary Instrument (1923) By George Monson. Based on spherical theory of occlusion. Have slot screws that can vary the instrument radius. www.indiandentalacademy.com
  19. 19. Stansbery Tripod Articulator(1929) Designed without a hinge to facilitate the reproduction of any positional set relationship. No representation of the condyles. Provided with a lathe attachment for “milling in” the occlusion of the completed dentures. www.indiandentalacademy.com
  20. 20. House Articulator (1930) Features: Permit eccentric motion based on engraved records. Accepts records by means of Needle House method . Also employs a milling device in the upper member for occlusal adjustment. www.indiandentalacademy.com
  21. 21. Page’s Transograph (1952) Split axis instrument . Allows each condylar housing to function independently of the other www.indiandentalacademy.com
  22. 22. Hanau Model M kinescope (1923) It has double condylar posts.The inner posts serve 2 purposes They act as horizontal condylar guides. They are variable rotation centers when the posts are moved inward or outward. www.indiandentalacademy.com
  23. 23. Hanau Model H110 (1926) Accepts face bow transfer. Horizontal condylar inclinations are set by means of a protrusive interocclusal records Lateral settings calculated by L=H/8+12 www.indiandentalacademy.com
  24. 24. Hanau Model H110 Modified(1927) Similar to H110 except that it had an incisal guide table instead of incisal guide cap. Adjustments in 3 dimensions through a considerable range www.indiandentalacademy.com
  25. 25. Hanau Crown and Bridge articulator(1934) Small articulator requires no face bow. Has a posterior pin and guidance mechanism to simulate working and balancing side excursions of 15 degrees. Its fixed protrusive movement is 30 degrees. www.indiandentalacademy.com
  26. 26. Hanau Model H2 Series(1958) There was an increased distance between upper and lower members from 95mm to 110 mm. Accepts face bow transfer. Horizontal condylar inclinations are simulated by means of a protrusive interocclusal record. www.indiandentalacademy.com
  27. 27. Hanau H2 Series •Hanau model H2-O with orbital indicator attachment. •Model H2-X with extendable condylar shafts. •Model H2 PR with calibrated adjustments to protrude or retrude the condyles up to 3mm •Model H2 XPR is a combination of the above models. www.indiandentalacademy.com
  28. 28. Hanau Radial Shift (1981)  Condylar guidance of the articulator is designed to incorporate a curved immediate side shift (radial shift) with an adjustable progressive Bennett angle. www.indiandentalacademy.com
  29. 29. Hanau Wide Vue(1983) Lingual visibility is unobstructed Dual End Incisal Pin Wide Vue 2- Open condylar track. www.indiandentalacademy.com
  30. 30. TMJ ARTICULATORS -Kenneth Swanson (1965) This is now a versatile system. It accepts custom fossa analogs that are formed from intra oral stereographic tracing. Intercondylar distance is limited from 110mm to 150mm. It has all conversion feature of deluxe model articulator www.indiandentalacademy.com
  31. 31. Classification of ArticulatorsClassification of Articulators  Based on Theories of OcclusionBased on Theories of Occlusion  Gillis (1926), Boucher (1934), KingeryGillis (1926), Boucher (1934), Kingery (1934)(1934)  Beck’s (1962)Beck’s (1962)  Weinberg (1963)Weinberg (1963)  Posselt's (1968)Posselt's (1968)  Thomas (1973)Thomas (1973)  Sherry (1974)Sherry (1974) www.indiandentalacademy.com
  32. 32.  International prosthodontic workshop onInternational prosthodontic workshop on complete denture occlusion (1972)complete denture occlusion (1972)  Heartwell and Rahn classification www.indiandentalacademy.com
  33. 33. Classification based on THEORIES of OCCLUSION  Bonwill’s theory of occlusion  Conical theory of occlusion (R.E.Hall )  Spherical theory of occlusion (G.S.Monson 1918 ) www.indiandentalacademy.com
  34. 34. BONWILL’S THEORY OF OCCLUSION  Bonwill introduced (1864) -“Theory of Equilateral Triangle”  4" (10 cm ) distance occurs between the condyle and between each condyle & the incisal point. www.indiandentalacademy.com
  35. 35. CONICAL THEORY OF OCCLUSION  R.E.HALL (1915) proposed that  Lower teeth move over the surface of the upper teeth as over the surface of asurface of a conecone, generating an angle of 45° with the central axis of the cone tipped at 45 angle to the occlusal plane. www.indiandentalacademy.com
  36. 36. www.indiandentalacademy.com
  37. 37. SPHERICAL THEORY OF OCCLUSION (Monson 1918)  Monson proposed that  Lower teeth moves over the surface of the upper teeth as over the surface of a sphere with a diameter of 8 " (20 cm). www.indiandentalacademy.com
  38. 38. • The center of the sphere is located in the region of Glabella and the surfaces of the sphere passes through the Glenoid fossa along the articulating eminences. www.indiandentalacademy.com
  39. 39. Gillis (1926), Boucher (1934), Kingery (1934)  ADJUSTABLEADJUSTABLE  NON ADJUSTABLENON ADJUSTABLE www.indiandentalacademy.com
  40. 40. BECK’S (1962) :  Suspension instrumentSuspension instrument  Axis instrumentAxis instrument  Tripod instrumentTripod instrument www.indiandentalacademy.com
  41. 41. WEINBERG (1963))  ARBITRARY (Monson spherical theory)  POSITIONAL (Stansbery tripod concept)  SEMI ADJUSTABLE (Hanau H concept)  FULLY ADJUSTABLE (Hanau Kinoscope concept, Gysi Trubyte concept and McCollum concept) www.indiandentalacademy.com
  42. 42. POSSELT’S (1968)POSSELT’S (1968)  Plain line Articulator  Mean value Articulator  Adjustable Articulator www.indiandentalacademy.com
  43. 43. International workshop on Complete Denture Occlusion (1972) Based on  Instruments function,  Instrument capability,  Intent  Registration procedure  Registration acceptance. www.indiandentalacademy.com
  44. 44. Class I.  Subdivision A  Subdivision B Class II.  Subdivision A  Subdivision B  Subdivision C Class III.  Subdivision A  Subdivision B Class IV.  Subdivision A  Subdivision B www.indiandentalacademy.com
  45. 45.  Subdivision A:  Vertical motion is possible, but only for convenience. The Corelator (Denar Corp.) The Verticulator (Jelenko) www.indiandentalacademy.com
  46. 46.  Subdivision B:  Vertical motion is joint related. The Centric relator (Denar Corp) www.indiandentalacademy.com
  47. 47.  CLASS II. ARTICULATOR  An instrument that PERMITS Horizontal as well as Vertical motion but does notdoes not orientorient the motion to the temporomandibular joints. www.indiandentalacademy.com
  48. 48.  Subdivision A:  Eccentric motion permitted is based on average or arbitrary values  NO FACE-BOW TRANSFER. Gysi Simplex Articulatorwww.indiandentalacademy.com
  49. 49.  Subdivision B:  Eccentric motion permitted is based on theories of arbitrary motion.  No Face-Bow Transfer. Shofu Handy II Articulator www.indiandentalacademy.com
  50. 50.  Subdivision C:  Eccentric motion permitted is determined by the patient using engraving methods/records.  No face bow transfer The Gnathic Relator www.indiandentalacademy.com
  51. 51.  CLASS III. ARTICULATOR  Simulate condylar pathways using averages or mechanical equivalents for all or part of the motion.  Orientation of cast relative to joints  Arcon or Nonarcon instruments  Accept facebows  Mounting plates for unlimited case load. www.indiandentalacademy.com
  52. 52.  Subdivision A:  Accept STATIC PROTRUSIVE Registrations and use equivalents for the rest of the motion. Dentatus articulator www.indiandentalacademy.com
  53. 53.  Subdivision B:  Accepts STATIC LATERAL PROTRUSIVE registrations and use equivalents for the rest of the motion. Panadent Model P Articulator www.indiandentalacademy.com
  54. 54. The Ney Articulator Gysi Trubyte articulator, Hanau 130-21 www.indiandentalacademy.com
  55. 55. www.indiandentalacademy.com
  56. 56.  CLASS IV. ARTICULATOR  Accept three dimensional dynamic registrations.  Orientation of the casts to the temporomandibular joints and replication of ALL MANDIBULAR MOVEMENTS. www.indiandentalacademy.com
  57. 57.  Subdivision A:  The cam representing the condylar paths are formed by registration engraved by the patient. TMJ-Stereographic instrument www.indiandentalacademy.com
  58. 58. www.indiandentalacademy.com
  59. 59. Stereograph (TMJ articulator) www.indiandentalacademy.com
  60. 60. Denar Combi articulator www.indiandentalacademy.com
  61. 61.  Subdivision B:  Have condylar paths that can be ANGLEDANGLED and CUSTOMIZEDCUSTOMIZED either by selection from a variety of curvatures, by modification, or both.  These articulators are the instruments of choice for complete reconstructions and as teaching aids for advanced occlusal studies. www.indiandentalacademy.com
  62. 62. Stuart Articulator Denar D5A Articulator www.indiandentalacademy.com
  63. 63. Stuart Pantograph Denar Pantograph www.indiandentalacademy.com
  64. 64. www.indiandentalacademy.com
  65. 65. Cyberhoby fully adjustable articulator and Cyberhoby computer pantograph www.indiandentalacademy.com
  66. 66. Requirements  It should Hold casts in correct horizontal and vertical relationships. Provide a positive anterior vertical stop (incisal pin) Accept a facebow transfer record utilising anterior reference point. Open and close in hinge movement. Allow lateral and protrusive jaw motion. www.indiandentalacademy.com
  67. 67. Additional requirements  Centric locking device  Removable mounting plates that can be positioned accurately.  Adjustable incisal guide table.  Adjustable inter condylar width of the condylar elements. www.indiandentalacademy.com
  68. 68. Uses  To diagnose dental occlusal conditions in both natural and artificial conditions.  To plan dental procedures that involve positions,contuors,and relationships of both natural and artificial teeth as they relate to each other..  To correct and modify completed restorations.  Can be helpful in teaching and studying of occlusion and mandibular movements. www.indiandentalacademy.com
  69. 69. Advantages  Better visualization (lingual view)..  Patient cooperation not critical once the appropriate inter occlusal record is obtained.  Refinement of complete denture occlusion is much easier using an articulator than in patient’s mouth.  Saves time.  Patients tongue, saliva, cheeks are not factors. www.indiandentalacademy.com
  70. 70. Advantages of adjustable articulators  Balanced occlusion: In any closed mandibular position,centric or eccentric maxium number of teeth is in contact and therefore the occlusal load is distributed over the supporting tissues. Stability: Because of maximum number of teeth in contact and elimination of cuspal interference,little tendency of the dentures to be dragged across the mucosa www.indiandentalacademy.com
  71. 71. Contd  Reduced trauma: Minimum amount of damage to the supporting tissue. Functional movements Balanced articulation allows for normal mandibular movement, than teeth set for static occlusion which requires a new pattern of muscle controlled movements to be learnt. www.indiandentalacademy.com
  72. 72. Limitations  The articulator is subject to error in tolling and errors resulting from metal fatigue.  The movements simulated are empty mouth sliding motions and not functional movements.  It is unlikely for any articulator to duplicate condylar movements in the TMJ. www.indiandentalacademy.com
  73. 73. Selection of an articulator for complete dentures  If occlusal contacts are to be perfected in centric relation only ,then a simple hinge articulator can be selected  If denture teeth are to have cross arch and cross tooth balanced occlusion then minimum requirement is semi adjustable articulator.  If complete control of occlusion is desired,a completely adjustable articulator is selected. www.indiandentalacademy.com
  74. 74. contd  These complicated articulators pose problems in fabricating complete dentures because of the resiliency of soft tissues of basal seat on which the recording bases must rest.  As the resiliency permits some movements of the bases in relation to the bone, the records made are not necessarily of the true path. www.indiandentalacademy.com
  75. 75. Parts of an Articulator The movement of the frame of the articulator is governed at three points. Posteriorly by the two condylar guidances and anteriorly by the incisal post www.indiandentalacademy.com
  76. 76. Condylar guidance  It is the mechanical form located in the upper posterior region that controls movement of its mobile.  Condylar guidance inclination  The angle formedby the inclination of a condylar guide control surface of an articulator with the horizontal. (GPT-8) www.indiandentalacademy.com
  77. 77. Importance  Condylar path is determined by the distal slope of the articular eminence.  This path dis engages the teeth in the excursions of the mandible.  The cusps should travel past each other with out interfering with the excursions,yet they should be close enough to masticate food efficiently.  The angle of the path determines the cuspal angle from the tip of a cusp to the fossa.  The curvature determines the topography of cusp between its and the base of the fossa.www.indiandentalacademy.com
  78. 78. negative condylar guidance  When the inclination of central bearing plate is greater than the axis path inclination a negative angle will be registered.  In such cases , compesatory curves may almost be flat or reversed. www.indiandentalacademy.com
  79. 79. Incisal guidance  Anatomically The influence of the contacting surfaces of the mandibular and maxillary anterior teeth on mandibular movements.  On the articulator The influence of the contacting surfaces of the guide pin and guide table on articulator movements. www.indiandentalacademy.com
  80. 80. Incisal guide angle  Anatomically The angle formed by the intersection of the plane of occlusion and a line within the sagittal plane determined by the incisal edges of the maxillary and mandibular central incisors when the teeth are in maximum intercuspation.  On the articulator That angle formed in the sagittal plane,between the plane of reference and the slope of anterior guide table,as viewed in the sagittal plane. www.indiandentalacademy.com
  81. 81. Importance  Angle of the incisal guidance table will markedly affect the cusp angles,cusp height,overbite and overjet.  Steeper the slope of the incisal guide table,the higher and steeper will need to be the cusps of premolar and molar teeth.  This high steep cusps are liable to instability of dentures in mouth because limitations in the accuracy of simulating the patient in the laboratory. www.indiandentalacademy.com
  82. 82. Importance contd  Make vertical overlap as lessas possible.this is particularly true when the mandible is atrophic and almost without any alveolar ridge. www.indiandentalacademy.com
  83. 83. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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