OCCLUSAL
REGISTRATION IN
REMOVABLE PARTIAL
DENTURE
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiand...
OCCLUSION
• The static relationship between the
incising or masticating surfaces of the
maxillary or mandibular teeth or t...
CENTRIC RELATION
• The maxillomandibular relationship in which the
condyles articulate with the thinnest avascular
portion...
CENTRIC OCCLUSION
• The occlusion of opposing teeth when the
mandible is in centric relation.(GPT-7)
www.indiandentalacade...
MAXIMAL INTERCUSPAL
POSITION
• The complete intercuspation of the
opposing teeth independent of condylar
position, sometim...
VERTICAL DIMENSION
• The distance between two selected
points, one on a fixed and one on a
movable member.
• OCCLUSAL VERT...
• PHYSILOGICAL REST POSITION :the
mandibular position assumed when the
head is in an upright position and the
involved mus...
OCCLUSAL REGISTRATION
• A registration of the positional relationship
of apposing teeth or arches; a record of
the positio...
OBJECTIVES:
 To establish & maintain a harmonious
relationship with all oral structures & to
provide a masticatory appara...
 A harmonious occlusion contributes
materially to the control of damaging,
leverage induced stresses where as a
faculty o...
www.indiandentalacademy.com
IDEAL REQUIREMENTS OF
BITE REGISTRATION
MATERIAL
 Limited resistance before setting to avoid
displacing the teeth or mand...
 Easy to manipulate.
 No adverse effects on the tissues involved
in recording procedures.
 Interocclusal record should ...
IMPRESSION PLASTER
• Basically plaster of Paris in which
modifiers have been added. Modifiers
accelerates setting time &de...
ADVANTAGES:
 Accurate.
 Rigid after setting.
 Do not distort after extended storage.
www.indiandentalacademy.com
DISADVANTAGES:
 Difficult to handle because the material is
unmanageable prior to setting.
 The final interocclusal reco...
WAXES
• Thermoplastic waxes are frequently used
for interocclusal registration as records or
as a carrier for registration...
ADVANTAGES:
 Easy to manipulate
DISADVANTAGES:
 Inaccurate
 Unstable
 Inconsistent due to interference with
passive an...
ZINC –OXIDE EUGENOL
PASTES
• Is an effective interocclusal registration
material
• ADVANTAGES
• Fluidity before setting.
•...
• Adhesion to its carrier
• Rigidity and inelasticity after final set
• Accuracy in recording occlusal and incisal
surface...
DISADVANTAGES
• Lengthy setting
time
• Significant
brittleness
• The accuracy of
the registration
material may
surpass the...
SILICONE ELASTOMERS
Two types of silicone elastomers are
available as interocclusal registration
materials
• Condensation ...
ADVANTAGES:
• Accuracy
• Stability after setting
• Minimal resistance to closure
• Does not require a carrier
DISADVANTAGE...
POLYETHER ELASTOMERS
• These were introduced to dentistry in the
early 1970’s.
• Poly ether interocclusal registration
mat...
ADVANTAGES:
• Accuracy
• Stability after polymerization and during
storage
• Fluidity and minimal resistance to closure
• ...
www.indiandentalacademy.com
DISADVANTAGES
• Resiliency and accuracy may exceed the
accuracy of the plaster casts. Both of
these factors can interfere ...
ACRYLIC RESINS
• The most frequent application of acrylic
resins for interocclusal records is in the
fabrication of single...
DISADVANTAGES:
• Dimensional instability of some
commercial formulations due to continued
polymerization resulting in shri...
STABILIZED BITE RIMS
• Stabilized rims may be constructed on the
replicas of the diagnostic cast. The rims
are transferred...
• LaDeane Fattore ,William F.malone and
associates conducted a study to compare the
clinical accuracy of various inter occ...
AND they concluded that
• Polyether inter occlusal recording medium
without a carrier was the most accurate
• Polyether an...
RECORDING OF OCCLUSAL
RELATIONSHIP
• It may vary from simple apposition of the
apposing casts by occluding sufficient
rema...
• The horizontal jaw relation (planned
intercuspal position or centric relation) in
which restoration is to be fabricated
...
METHODS OF RECORDING
OCCLUSION
 Direct apposition of casts.
 Interocclusal records with posterior teeth
remaining.
 Occ...
DIRECT APPOSITION OF CASTS
Also known as
“HAND
ARTICULATION”
coined by –
KROGH
POULSEN.
www.indiandentalacademy.com
INDICATIONS
• Sufficient opposing teeth that remain in
contact to make the existing jaw
relationship obvious.
• Only few t...
www.indiandentalacademy.com
• The opposing
casts are occluded
by hand.
• It can be moved
slightly in various
lateral
anteroposterior
direction of
move...
• The occluding
casts are secured
together either
with wooden
sticks/wire nails &
sticky wax .
• They are
mounted in a
art...
ADVANTAGES:
• Though there are limitation, yet it is better
than using an inaccurate record between
the remaining natural ...
LIMITATIONS
• The principle danger is this method may
perpetuate the existing vertical dimension
and any existing occlusal...
INTEROCCLUSAL RECORDS
WITH POSTERIOR TEETH
REMAINING
INDICATION:
It is the modification of the first
method and is used wh...
www.indiandentalacademy.com
PROCEDURE• A uniformly
softened, metal
reinforced wafer of
base plate or set
up wax is placed
between the teeth
and the pa...
• All excess wax
should be removed
with a sharp knife.
www.indiandentalacademy.com
• The wax is
removed and
chilled thoroughly.
It is again replaced
in mouth to correct
the distortion and
chilled again.
ww...
• The wax record should be further corrected
with a bite registration paste to obtain a
more accurate and dimensionally st...
• The impression
paste is applied to
both the side of the
wax record and the
patient is assisted
to close in centric
relat...
• After the paste is
set, the record is
removed and
excess is trimmed
off.
www.indiandentalacademy.com
• Record is secured
to the maxillary
cast and then
mounted in an
articulator.
www.indiandentalacademy.com
ADVANTAGES
• Provides an accurate interocclusal record.
• If an intact opposing arch is present stone
can be directly pour...
OCCLUSAL RELATIONALSHIPS
USING OCCLUSAL RIMS ON
RECORD BASES
INDICATION:
• When tooth supported edentulous space
is long.
...
•When one or more distal extension areas
are present.
www.indiandentalacademy.com
PROCEDURE
• Accurate
records
bases are to
be used to
support the
occlusal
relationship.
www.indiandentalacademy.com
• Occlusal rims are
constructed over
the record bases
by wax occlusion
rims or modeling
plastic occlusion
rims.
www.indian...
• Vertical dimension
is corrected .
Occlusion rims are
reduced in height
just out of occlusal
contact. A single
stop is ad...
• Bite registration is
made by injecting
the recording
medium in
between the two
occluding surfaces.
www.indiandentalacade...
• Patient should be
guided to the
centric position and
should be held in
position till the
material sets.
www.indiandental...
• Completed record
is examined and it
is trimmed so that
only cusp tips and
indices remain.
Cast are then
mounted on the
a...
JAW RELATION RECORDS
MADE ENTIRELY ON OCCLUSAL
RIMS
• When no occlusal contact exists between
the teeth, such as when oppo...
• When few
remaining teeth do
not occlude and
will not influence
eccentric jaw
movement.
• When only anterior
teeth is pre...
OBJECTIVES
• Static relation of the maxillary and
mandibular casts to each other should be
established in three planes. Th...
• Dynamic relationship of the two cast to be
established by protrusive and lateral
interocclusal records. These records ca...
PROCEDURE
• Stable record bases and rims are
required.
• Vertical dimension at rest and at occlusion
is established by mea...
• Eccentric records such as protrusive and
lateral records are made.
• Facebow transfer is made and the casts
are mounted ...
ADVANTAGES
• Method of choice when edentulous areas
are to be restored are opposed by
edentulous areas in a opposing jaw.
...
• Does not require patient co-operation as
that needed for generating functional
pathway.
www.indiandentalacademy.com
LIMITATION
• Skill and care is necessary to obtain the
intraoral records, accuracy and
thoroughness with which they are us...
ESTABLISHING OCCLUSION BY
RECORDING OF OCCLUSAL
PATHWAYS
• FUNCTIONALLY
GENERATED PATH
METHOD.
• It is a dynamic record
of...
• Theory:
when the pathways each tooth opposed
to the edentulous space makes
throughout all functional movements of the
ma...
CLINICAL PROCEDURE
• Stable acrylic resin record base with
compound hard wax or hard inlay wax
(purple) can be used to rec...
• Occlusal rims is
constructed slightly
higher than the
occlusal plane so
that the natural
teeth are apart by
0.5 to 0.75m...
• Buccolingual width
of rim is several
millimeters wider
than that of
opposing teeth.
This is necessary
to record the full...
There are two methods of having the patient
grind the occlusal pathways.
• First method : the patient is instructed to
wea...
• The patient is asked to wear the
prosthesis overnight so that any
involuntary or bruxism contacts can be
records.
• The ...
• Second method: is for the patient to create
the pathway directly under the supervision
of the dentist.
• Advantage: dent...
• The wax pattern is
boxed and poured
in improved stone
to provide
permanent record
of the generated
pathways.
www.indiand...
• The stone record is
mounted on a
articulator and the
artificial teeth are
set to contact the
record.
www.indiandentalaca...
ARTIFICIAL TEETH SET TO THE
GENERATED PATHWAY
• The incisal pin is opened 1mm before the
artificial teeth are positioned. ...
• After the teeth are set in correct alignment
the incisal pin is returned to correct
vertical dimension of occlusion.
• P...
• Spots of dye are transferred to the denture
teeth. selective grinding is done till the
incisal tip touches the incisal t...
ADVANTAGES
• The method makes unnecessary the
registration of inter occlusal records or a
face bow transfer and dispenses ...
LIMITATIONS
• Not indicated when the opposing
occlusion is provided by a complete
denture or when all the teeth is not
pre...
• The patient’s masticatory force and
direction may vary with foods of different
types. So the masticatory pattern of the
...
ESTABLISHING JAW
RELATIONS FOR A
MANDIBULAR PARTIAL
DENTURE OPPOSING A
MAXILLARY COMPLETE
DENTURE
www.indiandentalacademy....
• It is the most common situation.
• The maxillary denture may be already
present or it may be made concurrently
with the ...
ESTABISHMENT OF JAW
RELATION WITH EXISTING
MAXILLARY COMPLETE
DENTURE
• If the existing maxillary denture is
satisfactory ...
• The stylus must be carefully removed from
the denture and attached to the same
palatal location on the stone
cast.Mandib...
• When the mandibular partial denture
replaces all posterior teeth and the
anterior teeth are noninterfering, a central
be...
• If the relationship of maxillary posterior
teeth to the mandibular ridge is favorable
and the complete denture is stable...
MAXILLARY DENTURE TO BE
MADE CONCURRENTLY WITH
THE PARTIAL DENTURE
• If the mandibular partial denture will be
tooth suppo...
• If the mandibular partial denture has one
or more distal extension bases, the
occlusion on both the arches should be
acc...
• Occlusion should be established with
favorable tooth-to-ridge relationship,
optimal occlusal plane and cuspal
harmony be...
FIXED PARTIAL DENTURE
AGAINST REMOVABLE PARTIAL
DENTURE
• In this situation fixed partial denture
should be fabricated and...
• Better occlusion is possible if the occlusal
plane is restored with the abutment
restorations and pontics for the fixed
...
REFERENCES
• Removable partial denture-McCracken’s.
• Clinical removable partial prosthodontics-Stewart
• Partial dentures...
For more details please visit
www.indiandentalacademy.com
www.indiandentalacademy.com
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Occlusal registration in removable partial denture / orthodontic seminars

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Occlusal registration in removable partial denture / orthodontic seminars

  1. 1. OCCLUSAL REGISTRATION IN REMOVABLE PARTIAL DENTURE INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. OCCLUSION • The static relationship between the incising or masticating surfaces of the maxillary or mandibular teeth or tooth analogues. (GPT-7) www.indiandentalacademy.com
  3. 3. CENTRIC RELATION • The maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective disks with the complex in the anterior-superior position against the shape of the articular eminences. This position is independent of tooth contact. This position is clinically discernible when the mandible is directed superior and anteriorly.it is restricted to a purely rotary movement about a transverse horizontal axis.(GPT-7) www.indiandentalacademy.com
  4. 4. CENTRIC OCCLUSION • The occlusion of opposing teeth when the mandible is in centric relation.(GPT-7) www.indiandentalacademy.com
  5. 5. MAXIMAL INTERCUSPAL POSITION • The complete intercuspation of the opposing teeth independent of condylar position, sometimes referred to as the best fit of the teeth regardless of the condylar position.(GPT-7) www.indiandentalacademy.com
  6. 6. VERTICAL DIMENSION • The distance between two selected points, one on a fixed and one on a movable member. • OCCLUSAL VERTICAL DIMENSION : the distance between two points when the occluding members are in contact. www.indiandentalacademy.com
  7. 7. • PHYSILOGICAL REST POSITION :the mandibular position assumed when the head is in an upright position and the involved muscles, particularly the elevators and depressor groups, are in equilibrium and tonic contraction, the condyles are in a neutral, unstrained position.(GPT-7) www.indiandentalacademy.com
  8. 8. OCCLUSAL REGISTRATION • A registration of the positional relationship of apposing teeth or arches; a record of the positional relationship of the teeth or jaws to each other.(GPT-7) www.indiandentalacademy.com
  9. 9. OBJECTIVES:  To establish & maintain a harmonious relationship with all oral structures & to provide a masticatory apparatus which is efficient, comfortable & esthetically pleasing.  Necessary for distribution of functional forces evenly as possible to all supporting structures within their capability of withstanding the stress. www.indiandentalacademy.com
  10. 10.  A harmonious occlusion contributes materially to the control of damaging, leverage induced stresses where as a faculty occlusion compounds the destructive forces. www.indiandentalacademy.com
  11. 11. www.indiandentalacademy.com
  12. 12. IDEAL REQUIREMENTS OF BITE REGISTRATION MATERIAL  Limited resistance before setting to avoid displacing the teeth or mandible during closure.  Rigid or resilient after setting.  Minimal dimensional change after setting.  Ideal recording of occlusal & incisal surface of the teeth. www.indiandentalacademy.com
  13. 13.  Easy to manipulate.  No adverse effects on the tissues involved in recording procedures.  Interocclusal record should be verifiable. www.indiandentalacademy.com
  14. 14. IMPRESSION PLASTER • Basically plaster of Paris in which modifiers have been added. Modifiers accelerates setting time &decreases setting expansion. www.indiandentalacademy.com
  15. 15. ADVANTAGES:  Accurate.  Rigid after setting.  Do not distort after extended storage. www.indiandentalacademy.com
  16. 16. DISADVANTAGES:  Difficult to handle because the material is unmanageable prior to setting.  The final interocclusal record is brittle. www.indiandentalacademy.com
  17. 17. WAXES • Thermoplastic waxes are frequently used for interocclusal registration as records or as a carrier for registration. • Wax is widely accepted as an interocclusal recording material. www.indiandentalacademy.com
  18. 18. ADVANTAGES:  Easy to manipulate DISADVANTAGES:  Inaccurate  Unstable  Inconsistent due to interference with passive and active movements of mandible. www.indiandentalacademy.com
  19. 19. ZINC –OXIDE EUGENOL PASTES • Is an effective interocclusal registration material • ADVANTAGES • Fluidity before setting. • Fluidity is a critical quality of an occlusal registration material because it ensures minimal interference with mandibular closure during record making procedures. www.indiandentalacademy.com
  20. 20. • Adhesion to its carrier • Rigidity and inelasticity after final set • Accuracy in recording occlusal and incisal surfaces of the teeth • High degree of repeatability www.indiandentalacademy.com
  21. 21. DISADVANTAGES • Lengthy setting time • Significant brittleness • The accuracy of the registration material may surpass the accuracy of the casts, resulting in improper fit. www.indiandentalacademy.com
  22. 22. SILICONE ELASTOMERS Two types of silicone elastomers are available as interocclusal registration materials • Condensation silicone • Additional silicone Currently, additional silicone has gained acceptance because it is more stable than condensation silicone www.indiandentalacademy.com
  23. 23. ADVANTAGES: • Accuracy • Stability after setting • Minimal resistance to closure • Does not require a carrier DISADVANTAGES: • its resistance to compression of the set material ,which contributes to difficulty in seating of plaster cast www.indiandentalacademy.com
  24. 24. POLYETHER ELASTOMERS • These were introduced to dentistry in the early 1970’s. • Poly ether interocclusal registration material consists of the basic impression material augmented by plasticizers and fillers www.indiandentalacademy.com
  25. 25. ADVANTAGES: • Accuracy • Stability after polymerization and during storage • Fluidity and minimal resistance to closure • Polyether can be used without a carrier www.indiandentalacademy.com
  26. 26. www.indiandentalacademy.com
  27. 27. DISADVANTAGES • Resiliency and accuracy may exceed the accuracy of the plaster casts. Both of these factors can interfere with the placement of the plaster cast into the recording medium during mounting procedures. • The records are trimmed to remove excess material and preserve only the teeth indentations, avoiding distortions. www.indiandentalacademy.com
  28. 28. ACRYLIC RESINS • The most frequent application of acrylic resins for interocclusal records is in the fabrication of single –stop centric occlusion records ADVANTAGES • Accurate • Rigid after setting www.indiandentalacademy.com
  29. 29. DISADVANTAGES: • Dimensional instability of some commercial formulations due to continued polymerization resulting in shrinkage. • The strength and rigidity of the material can damage plaster cast and dies during articulator mounting. www.indiandentalacademy.com
  30. 30. STABILIZED BITE RIMS • Stabilized rims may be constructed on the replicas of the diagnostic cast. The rims are transferred to the mouth and the centric closure position recorded. • Stabilized rims are indicated for the positioning the cast prior to the formation of the treatment plan and tooth preparation. www.indiandentalacademy.com
  31. 31. • LaDeane Fattore ,William F.malone and associates conducted a study to compare the clinical accuracy of various inter occlusal recording materials (JPD 1984:51(2) 152-157) . • THEY COMPARED 1.Two thickness pink base plate wax 2.Reinforced wax 3.Zinc -oxide eugenol paste 4.A modified ,non rigid poly ether recording medium with a carrier 5.Poly ether without a carrier www.indiandentalacademy.com
  32. 32. AND they concluded that • Polyether inter occlusal recording medium without a carrier was the most accurate • Polyether and Zinc -oxide eugenol paste with carriers were the next most accurate recording mediums. • Recording waxes were consistently unreliable. • Distortion occurred more frequently in a vertical direction followed by an antero- posterior direction. www.indiandentalacademy.com
  33. 33. RECORDING OF OCCLUSAL RELATIONSHIP • It may vary from simple apposition of the apposing casts by occluding sufficient remaining natural teeth to recording of jaw relationship in the same manner as for a completely edentulous patient. www.indiandentalacademy.com
  34. 34. • The horizontal jaw relation (planned intercuspal position or centric relation) in which restoration is to be fabricated should be determined during diagnosis & treatment planning. • Mouth preparation should be based on this determination including occlusal adjustment of natural dentition wherever indicated. www.indiandentalacademy.com
  35. 35. METHODS OF RECORDING OCCLUSION  Direct apposition of casts.  Interocclusal records with posterior teeth remaining.  Occlusal relation using occlusal rims on record bases.  Jaw relation made entirely on occlusion rims.  Establishing occlusion by recording of occlusal pathways. www.indiandentalacademy.com
  36. 36. DIRECT APPOSITION OF CASTS Also known as “HAND ARTICULATION” coined by – KROGH POULSEN. www.indiandentalacademy.com
  37. 37. INDICATIONS • Sufficient opposing teeth that remain in contact to make the existing jaw relationship obvious. • Only few teeth are to be replaced on short denture bases. • There is no evidence of occlusal pathology. www.indiandentalacademy.com
  38. 38. www.indiandentalacademy.com
  39. 39. • The opposing casts are occluded by hand. • It can be moved slightly in various lateral anteroposterior direction of movement by observation of facets on remaining teeth. www.indiandentalacademy.com
  40. 40. • The occluding casts are secured together either with wooden sticks/wire nails & sticky wax . • They are mounted in a articulator. www.indiandentalacademy.com
  41. 41. ADVANTAGES: • Though there are limitation, yet it is better than using an inaccurate record between the remaining natural teeth. • It eliminates the clinical appointment for establishing occlusal relationship. www.indiandentalacademy.com
  42. 42. LIMITATIONS • The principle danger is this method may perpetuate the existing vertical dimension and any existing occlusal disharmony. • So occlusal analysis and correction of any occlusal disharmony should precede the accepting of such a jaw relation. www.indiandentalacademy.com
  43. 43. INTEROCCLUSAL RECORDS WITH POSTERIOR TEETH REMAINING INDICATION: It is the modification of the first method and is used when sufficient teeth remain to support the partial denture (Kennedy class III or class IV) but the relationship of opposing teeth does not permit the occluding of cast by hand. www.indiandentalacademy.com
  44. 44. www.indiandentalacademy.com
  45. 45. PROCEDURE• A uniformly softened, metal reinforced wafer of base plate or set up wax is placed between the teeth and the patient is guided to close in centric relation. www.indiandentalacademy.com
  46. 46. • All excess wax should be removed with a sharp knife. www.indiandentalacademy.com
  47. 47. • The wax is removed and chilled thoroughly. It is again replaced in mouth to correct the distortion and chilled again. www.indiandentalacademy.com
  48. 48. • The wax record should be further corrected with a bite registration paste to obtain a more accurate and dimensionally stable record. • For this procedure the opposing surface of teeth is coated with petroleum jelly for ease of removal of record. www.indiandentalacademy.com
  49. 49. • The impression paste is applied to both the side of the wax record and the patient is assisted to close in centric relation guided by the wax record. www.indiandentalacademy.com
  50. 50. • After the paste is set, the record is removed and excess is trimmed off. www.indiandentalacademy.com
  51. 51. • Record is secured to the maxillary cast and then mounted in an articulator. www.indiandentalacademy.com
  52. 52. ADVANTAGES • Provides an accurate interocclusal record. • If an intact opposing arch is present stone can be directly poured into the record to serve as a opposing cast. • Acceptable procedure in fabricating unilateral fixed partial denture. www.indiandentalacademy.com
  53. 53. OCCLUSAL RELATIONALSHIPS USING OCCLUSAL RIMS ON RECORD BASES INDICATION: • When tooth supported edentulous space is long. • When opposing teeth do not meet. www.indiandentalacademy.com
  54. 54. •When one or more distal extension areas are present. www.indiandentalacademy.com
  55. 55. PROCEDURE • Accurate records bases are to be used to support the occlusal relationship. www.indiandentalacademy.com
  56. 56. • Occlusal rims are constructed over the record bases by wax occlusion rims or modeling plastic occlusion rims. www.indiandentalacademy.com
  57. 57. • Vertical dimension is corrected . Occlusion rims are reduced in height just out of occlusal contact. A single stop is added to maintain their terminal position. www.indiandentalacademy.com
  58. 58. • Bite registration is made by injecting the recording medium in between the two occluding surfaces. www.indiandentalacademy.com
  59. 59. • Patient should be guided to the centric position and should be held in position till the material sets. www.indiandentalacademy.com
  60. 60. • Completed record is examined and it is trimmed so that only cusp tips and indices remain. Cast are then mounted on the articulator by using the record. www.indiandentalacademy.com
  61. 61. JAW RELATION RECORDS MADE ENTIRELY ON OCCLUSAL RIMS • When no occlusal contact exists between the teeth, such as when opposing maxillary complete denture is to be made concurrently with a mandibular partial denture. www.indiandentalacademy.com
  62. 62. • When few remaining teeth do not occlude and will not influence eccentric jaw movement. • When only anterior teeth is present www.indiandentalacademy.com
  63. 63. OBJECTIVES • Static relation of the maxillary and mandibular casts to each other should be established in three planes. This is accomplished clinically by establishing the vertical ,centric and orientation relationship. www.indiandentalacademy.com
  64. 64. • Dynamic relationship of the two cast to be established by protrusive and lateral interocclusal records. These records can be used to program the articulator to simulate the natural movements of the jaw. www.indiandentalacademy.com
  65. 65. PROCEDURE • Stable record bases and rims are required. • Vertical dimension at rest and at occlusion is established by means of NISWONGER’s precepts. • Centric relationship can be established by direct interocclusal method or by stylus tracing is used. www.indiandentalacademy.com
  66. 66. • Eccentric records such as protrusive and lateral records are made. • Facebow transfer is made and the casts are mounted on a semi adjustable articulator. • Articulator is programmed to simulate natural movements of the lower jaw. Desired occlusion is obtained. www.indiandentalacademy.com
  67. 67. ADVANTAGES • Method of choice when edentulous areas are to be restored are opposed by edentulous areas in a opposing jaw. • Better method when the prosthesis is opposed by a completely edentulous arch. • Occlusion can be developed rather simply for a typical partial denture, in a minimum amount of time. www.indiandentalacademy.com
  68. 68. • Does not require patient co-operation as that needed for generating functional pathway. www.indiandentalacademy.com
  69. 69. LIMITATION • Skill and care is necessary to obtain the intraoral records, accuracy and thoroughness with which they are used to program the instrument. www.indiandentalacademy.com
  70. 70. ESTABLISHING OCCLUSION BY RECORDING OF OCCLUSAL PATHWAYS • FUNCTIONALLY GENERATED PATH METHOD. • It is a dynamic record of movement of opposing tooth surface. www.indiandentalacademy.com
  71. 71. • Theory: when the pathways each tooth opposed to the edentulous space makes throughout all functional movements of the mandible are recorded, the artificial teeth may thus be positioned and formed so that it will remain in harmonious contact with its antagonist all the times. www.indiandentalacademy.com
  72. 72. CLINICAL PROCEDURE • Stable acrylic resin record base with compound hard wax or hard inlay wax (purple) can be used to record the occlusal pathways. www.indiandentalacademy.com
  73. 73. • Occlusal rims is constructed slightly higher than the occlusal plane so that the natural teeth are apart by 0.5 to 0.75mm. www.indiandentalacademy.com
  74. 74. • Buccolingual width of rim is several millimeters wider than that of opposing teeth. This is necessary to record the full range of motion. www.indiandentalacademy.com
  75. 75. There are two methods of having the patient grind the occlusal pathways. • First method : the patient is instructed to wear the occlusal rims continuously for 24 hrs excepting when eating and drinking hot or chilled drinks. He should be told to close the jaws intermittently and grind the wax in all possible jaw position. www.indiandentalacademy.com
  76. 76. • The patient is asked to wear the prosthesis overnight so that any involuntary or bruxism contacts can be records. • The resulting pathway will be record of all possible jaw movements and tooth contacts. www.indiandentalacademy.com
  77. 77. • Second method: is for the patient to create the pathway directly under the supervision of the dentist. • Advantage: dentist is able to observe and correct the movement the patient is making. • Disadvantage: atleast 30min of active movement of the mandible is necessary. www.indiandentalacademy.com
  78. 78. • The wax pattern is boxed and poured in improved stone to provide permanent record of the generated pathways. www.indiandentalacademy.com
  79. 79. • The stone record is mounted on a articulator and the artificial teeth are set to contact the record. www.indiandentalacademy.com
  80. 80. ARTIFICIAL TEETH SET TO THE GENERATED PATHWAY • The incisal pin is opened 1mm before the artificial teeth are positioned. This increase in vertical dimension will be returned to normal by selective grinding of the teeth. • The selective grinding develops occlusal anatomy of the denture teeth to conform to the functionally generated stone path.www.indiandentalacademy.com
  81. 81. • After the teeth are set in correct alignment the incisal pin is returned to correct vertical dimension of occlusion. • Prussian blue dye is painted on to the surface of generated pathway. Opening and closing tapping movements are made of stone path against the denture teeth. www.indiandentalacademy.com
  82. 82. • Spots of dye are transferred to the denture teeth. selective grinding is done till the incisal tip touches the incisal table. • The articulator is not moved into protrusive and lateral movements because these positions are incorporated in the pathway. www.indiandentalacademy.com
  83. 83. ADVANTAGES • The method makes unnecessary the registration of inter occlusal records or a face bow transfer and dispenses with the need for a complicated articulator. • Jaw movements and tooth pathways are reproduced under more nearly functional conditions than is the case when static registration are transferred to an instrument. www.indiandentalacademy.com
  84. 84. LIMITATIONS • Not indicated when the opposing occlusion is provided by a complete denture or when all the teeth is not present in the opposing occlusion. • Resistance may be encountered by the mandible as the teeth shear through the wax, which may serve to deflect the mandible from its natural path. www.indiandentalacademy.com
  85. 85. • The patient’s masticatory force and direction may vary with foods of different types. So the masticatory pattern of the teeth during actual function differs from that which they follow as they generate pathways. • Cannot be used to replace the anterior teeth. www.indiandentalacademy.com
  86. 86. ESTABLISHING JAW RELATIONS FOR A MANDIBULAR PARTIAL DENTURE OPPOSING A MAXILLARY COMPLETE DENTURE www.indiandentalacademy.com
  87. 87. • It is the most common situation. • The maxillary denture may be already present or it may be made concurrently with the opposing partial denture. www.indiandentalacademy.com
  88. 88. ESTABISHMENT OF JAW RELATION WITH EXISTING MAXILLARY COMPLETE DENTURE • If the existing maxillary denture is satisfactory and has acceptable occlusal plane, it can be treated as natural dentition. Face bow transfer is made and the cast obtained from the denture impression is mounted on the articulator. centric and eccentric records are made. www.indiandentalacademy.com
  89. 89. • The stylus must be carefully removed from the denture and attached to the same palatal location on the stone cast.Mandibular cast is orientated by means of centric records. • After processing the partial denture is mounted against the complete denture for occlusal correction. It will ensure more accurate cuspal relationship. www.indiandentalacademy.com
  90. 90. • When the mandibular partial denture replaces all posterior teeth and the anterior teeth are noninterfering, a central bearing point tracer may be mounted in the palate of maxillary denture and centric relation recorded by means of an intraoral stylus tracing against a stable mandibular base. www.indiandentalacademy.com
  91. 91. • If the relationship of maxillary posterior teeth to the mandibular ridge is favorable and the complete denture is stable functionally generated method can be used to obtain the records. • If the maxillary denture has be made with occlusal plane too low and improper interarch relationship due to any malposition of the natural teeth and if those teeth has been lost ,repositioning of the maxillary posterior teeth should be done before the construction of the partial denture. www.indiandentalacademy.com
  92. 92. MAXILLARY DENTURE TO BE MADE CONCURRENTLY WITH THE PARTIAL DENTURE • If the mandibular partial denture will be tooth supported it should be restored first and so the maxillary complete denture is made to occlude with an intact arch. www.indiandentalacademy.com
  93. 93. • If the mandibular partial denture has one or more distal extension bases, the occlusion on both the arches should be accomplished simultaneously. • All mouth preparations and restorative procedures need should be accomplished on remaining natural teeth. www.indiandentalacademy.com
  94. 94. • Occlusion should be established with favorable tooth-to-ridge relationship, optimal occlusal plane and cuspal harmony between all occluding teeth. • After try-in both dentures can be processed at the same time or the maxillary denture alone is fabricated and a record is obtained using functionally generated pathway and mandibular partial denture teeth can be set to accommodate the record. This gives good occlusal harmony. www.indiandentalacademy.com
  95. 95. FIXED PARTIAL DENTURE AGAINST REMOVABLE PARTIAL DENTURE • In this situation fixed partial denture should be fabricated and then the construction of removable partial denture should be made. www.indiandentalacademy.com
  96. 96. • Better occlusion is possible if the occlusal plane is restored with the abutment restorations and pontics for the fixed prosthesis and the teeth of removable partial denture are then arranged to articulate with them. www.indiandentalacademy.com
  97. 97. REFERENCES • Removable partial denture-McCracken’s. • Clinical removable partial prosthodontics-Stewart • Partial dentures –Osborne • Removable partial prosthodontics-Grosso & Miller. • Partial dentures -Swenson • Occlusion in removable partial denture-JPD, Jan-2004 • Accurate occlusal relationship in partial denture construction-JPD,Nov 1953. • Clinical evaluation of the accuracy of interocclusal recording materials-JPD ,Feb 1984 www.indiandentalacademy.com
  98. 98. For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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