Interocclusal / online orthodontic courses

IMPORTANCE AND RELEVANCE OF
INTER OCCLUSAL RECORDS IN
FIXED PROSTHODONTICS
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

INTRODUCTION
 The tactile or inter occlusal check record is
referred to as physiological method.The
kinesthetic sense or muscle sense helps to
direct movements of parts of body through
space.
 It is one of the methods of recording centric
relation . It is particularly indicated in situations
of abnormally related jaws , supporting tissues
that are excessively displaceable , large
tongues , & uncontrollable or abnormal
mandibular movements. It is also used to check
occlusion in existing dentures & in trial dentures
.

TYPES OF INTER OCCLUSAL RECORDS
 Centric inter occlusal records
 Eccentric inter occlusal records
 lateral inter occlusal records
 protrusive inter occlusal records

DEFINITIONS
 Inter occlusal record : registration of the
positional relationship of the opposing teeth or
arches
 A record of the positional relationship of the teeth
or jaws to each other.
 Centric inter occlusal record- a record of centric
jaw position
 Eccentric inter occlusal record – a record of jaw
position other than centric
 Lateral –record of lateral eccentric jaw position
 Protrusive – record of protruded eccentric jaw
position .

FACTORS THAT INFLUENCE INTER OCCLUS
RECORDS
 Amount and equalization of pressure , which
depends on uniform consistency of recording
material .
 Comfort of patient ,which depends on stability
& compatibility of record bases. Artificial teeth
are more compatible to mandibular movements
than occlusion rims.
 An inter occlusal record with multiple points of
references made by styli or cusp tips is more
satisfactory than with occluding surfaces of wax
or non cusp form teeth.

TECHNIQUES
 Active techniques
 Passive techniques

METHODS OF ASSISTING THE PATIENT TO
RETRUDE THE MANDIBLE
1)instructing the patient to:
 let your jaw relax ,pull it back and close slowly and
easily on your back teeth
 get the feeling of pushing your
upper jaw out and close your back teeth
together

 Protrude and retrude the mandible repeatedly as the
patient holds the fingers lightly against the chin
 Turn the tongue backwards towards the posterior
border of the upper denture
 Tap the opcclusal rims or the back teeth repeatedly
 Tilting the head back while all the exercise is carried
out
 Palpating the temporal and the masseter muscles to
relax them

 One hand chin point guidance technique

Unguided technique
 Lucia jig
 leaf gauge
 Central bearing point
 Cotton roll

Tongue to palate technique

CHARACTERISTICS OF IDEAL REGISTRATION MATERIA
 Limited resistance before setting to avoid
displacing teeth or mandible during closure.
 Rigid after setting
 Minimum dimensional change
 Accurate record of incisal & occlusal
surfaces
 Easy to manipulate
 No adverse effect on tissue
 Records should be verifiable

 According to Dawson, the criteria for accuracy in
making interocclusal records include the following
points:
 1. The recording material must not cause any
movement of teeth or displacement of soft tissues.
 2. The recording material must fit cast as accurately
as it fits the teeth intra-orally.
 3. The accuracy of the jaw relation record should
check in the mouth and on the casts

MATERIALS
 Impression plaster
 zinc oxide eugenol
 waxes
 elastomers
 acrylic resins
 Impression compound

IMPRESSION PLASTER (SOLUBLE PLASTER)
 Type 1 modified with addition of accelerators to
decrease setting time & setting expansion
 Records are accurate , rigid after setting , do not
distort with extended storage ,
 Difficult to handle , record is brittle .

BITE REGISTRATION WAXES
 Ease of manipulation ,
 Inaccurate ,unstable ,inconsistent , may interfere
with active & passive movements

ZINC OXIDE EUGENOL PASTE
 Fluidity before setting – is a critical factor
because it ensures minimal interferences
with mandibular closure during recording .
 Adhesion to carriers
 Rigid and inelastic after setting
 Accuracy in recording occlusal and incisal
surfaces
 High degree of reproducibility

 Brittle(vital portion may be lost by breakage)
 Sticks to tissues
 Unless trimmed ,flash around the teeth may prevent
accurate seating of casts

SILICONE ELASTOMERS
Addition and condensation silicones
 Good accuracy.stable after setting,minimum
resistance to closure Resistance to compression of
set material
which contributes to difficulty of seating of plaster casts

Polyether material
 Accurate,stable to store,good fluidity,and
minimum resistance to closure .
Self curing acrylic resins
 Good fluidity , but brittle , generates heat
while setting , distortion & very hard on
dies.

Impression compound type I
uneven softening of material,distortion and inability
to reproduce details accurately.

 Three general classes of records are used to
transfer maxillo mandibular relation ship from
patient to articulator
 Inter occlusal records
 Graphic records
 Hinge axis records

Thank you
For more details please visit

Interocclusal / online orthodontic courses

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to Interocclusal / online orthodontic courses

Similar to Interocclusal / online orthodontic courses (20)

More from Indian dental academy

More from Indian dental academy (20)

Recently uploaded

Recently uploaded (20)

Interocclusal / online orthodontic courses