Try in for complete denture

1. TRY-IN
For Complete Denture Patients
Prepared by
Dr Sara Bahaa Mohamed
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2. Trial denture
“A preliminary arrangement of denture teeth that
has been prepared for placement into the patients
mouth to evaluate aesthetics & maxillomandibular
relationships”
Importance:
•
It is the last opportunity to evaluate many of the
previous steps already accomplished.
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3. 1) To check and verify the established
maxillomandibular relationship:
 Verify that centric occlusion and centric relation
coincide.
 Test for the acceptance of the established
vertical dimension of occlusion.
2) To determine if the positions of the teeth and the
contours of the denture bases are compatible with
the surrounding oral environment.
1) To verify tooth selection and arrangement for proper
esthetics and phonetics.
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4. Aspects of try in:
• Extraoral examination of the trial dentures.
• Intraoral examination of the trial dentures.
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5. Extraoral Examination Of The
Trial Dentures
The master cast
• As the finished denture is processed on the master
cast. So the master cast should be:
 In good shape.
 Free from air bubbles or scratches.
 Free from wax debris which lead to improper
adaptation of the trial denture bases leading to false
relationships.
 If there are any undercuts present in the cast, these
undercuts should be relieved to avoid scratching of
the cast by the trial denture bases.
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6. The trial denture bases
• Check the following:
The trial denture bases must be stable.
The borders of the trial denture base should be smooth,
round, and have no sharp edges.
Also the border should be shaped to conform to the depth
and width of the sulci.
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7. On the articulators
• The mounted cast is checked for:
a) Maintaining of the vertical
dimension of occlusion
 Top of the incisal pin is flush
with the upper member of the
articulator.
 The incisal pin is in contact
with the incisal table.
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8. Intraoral Examination Of The Trial
Dentures
1) Checking the trial dentures separately:
 Trying- in the upper denture.
 Trying- in the lower denture.
2) Checking the upper and lower dentures
together.
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9. Maxillary trial denture
Denture base extension:
• The labial and buccal extension:
 marked overextension of the flanges, will stretch the
sulcus tissues and when denture is inserted, leads to
elastic recoil resulting in dislodgment of the denture,
immediate denture displacement after its seating.
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10. • Also under extension of the upper trial denture
leads to poor physical retention.
• Correction will usually entail making a new final
impression.
• Provision of the frena {labial and buccal} should
be done to ensure that they have adequate
clearance.
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11. Posterior extension
• The posterior border of the upper trial denture
base should extended from the one hamular notch
to the other along the vibrating line of the soft
palate, and correctly placed on the master cast.
• If the post dam is not done before, it should be
done at this stage.
Arbitary scraping of the cast and redapting the
record base
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12. Retention
• It is noted that the retention of the trial denture is
less than that of completed denture, due to:
Absence of a posterior palatal seal.
Poor adaptation of the trial denture base to the
tissues.
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13. How to test the retention of upper
denture?
Seat the upper trial denture with a firm
upward and backward pressure.
Allow the tissues to settle around the
denture
Grip the labial and lingual surfaces of the
upper denture teeth between the thumb
and forefinger
Apply a firm downward vertical pull to
dislodge the denture away from the
tissues
 If the retention is good, dislodgment of
the trial denture may be difficult 13

14. Stability
• It is tested by applying pressure in a tissue ward
direction with the ball of the index finger in the
premolar and molar regions on each side alternately.
• This pressure must be directed at right angles to the
occlusal surface where displacement does occur.
• Causes of instability
Warpage of the denture base.
Posterior teeth set buccal to the underlying
alveolar ridge
Hard unrelieved area in the midline
e.g. torus palatinus.
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15. Orientation of the occlusal
plane
• Properly oriented occlusal plane is
important to:
Patient esthetics.
Patient comfort
Chewing function
Balance of occlusion
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16. Lower denture trial
• Denture base extension:
The lower trial denture extension
should be tested with the patient
mouth is opened no more than half
opened position to allow the
surrounding musculature is in an
acceptable state of relaxation.
Labial and buccal extensions are
checked as for the upper trial denture.
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17. evaluate lower denture retention
• Usually the lower denture retention is poor when
compared to the upper denture due to:
1. Small denture bearing area
2. The difficulty in obtaining an efficient border
seal.
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18. Lower occlusal plane
• In most patients, the incisal edges
of the natural lower canines and the
cusp tips of the lower first
premolars are located at the level
of the lower lip at the corner of
the mouth when the mouth is
slightly open.
• The posterior end of the occlusal
plane should be at the level of the
anterior two thirds of the retro
molar pad.
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19. Tongue space
• Natural teeth occupy a position in the mouth where
the inward pressure of the lips and the cheeks is
neutralized by an equal and opposite outward
pressure of the tongue, and it is in this zone of
neutral pressure that the artificial teeth must be
set (neutral zone).
.
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20. Checking the upper and lower
dentures together
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21. Checking the upper and lower
dentures together
• It is usually advisable to insert the lower trial denture
first and then the upper because there is less chance
of having the upper denture drop down.
• The patient should be seated in an upright position.
• The patient head is not supported by the headrest (the
headrest may effect the physiologic rest position of
the mandible so, it effect the amount of interocclusal
distance).
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22. Perfection & Verification of
Jaw-relation records
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23. Verifying the Vertical dimension
• Evaluation of Vertical dimension at rest & at occlusion
 pre extraction records
 amount of inter occlusal distance to which pt. was
accustomed
 phonetics & esthetics
 facial dimension & facial expressions
 lip length in relation to teeth
 inter arch distance & parallelism of the ridges
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24. Verifying Centric Relation
Intra Oral Observation of Intercuspation
• Pt. is guided into CR by a thumb placed on the
anteroinferior portion of the chin & index finger bilaterally
on the buccal flanges of the lower denture.
• Any Error in CR will be apparent when teeth slide over each
other.
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25. Contact during protrusion
At least three widely separated points or areas of
occlusion must exist.
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Eccentric relation records

26. Contact during lateral movement
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Working side Balancing side

27. 1. selection of artificial teeth
• Evaluated for size, form & color
• 6 anterior teeth should be of sufficient overall width to
extend approx. corner of mouth
• Color should blend with the face
• Any records used in initial selection
should be consulted & changes should
be made if it improves the appearance of patient
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28. 2. Horizontal orientation of anterior teeth
 Teeth set directly over ridges causes insufficient lip
support characterized by:
 Drooping of corners of mouth,
 Reduction in visible part of vermilion border,
 Deepening of nasolabial sulcus,
 Wrinkles over vermilion border
 Excessive lip support causes stretched lips, tendency of
lips to dislodge dentures during function, elimination of
normal contours of lips, philtrum & sulci.
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30. Harmony of the teeth with smiling line of the
lower lip
Line formed by upper anterior teeth should follow
curved line of lower lip during smiling
Vertical positioning of upper canines are responsible
for shape of smile line
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31. Canines should be arranged in such a way that their
incisal edges should be slightly shorter than that of
lateral incisors, if not it will create reverse smile line.
Reverse smile line is one of the frequent cause of
artificial appearing dentures.
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32. Thank you
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