This document summarizes the try-in stage of denture construction. It discusses examining the trial denture extra-orally and intra-orally to check extension, retention, stability, occlusion, vertical dimension, centric relation, even occlusal pressure, esthetics, and phonetics. Any issues identified need to be addressed before proceeding to the next stage of denture fabrication. The try-in allows modifications to be made to the wax denture before processing into the final denture.

1. ‫الرحمن‬ ‫هللا‬ ‫بسم‬
‫الرحيم‬

2. Try- in Stage

3. It is a very important stage in denture construction which
follows the setting up of teeth and waxing up stages
To Check all the details in dentures because it is
difficult and sometimes impossible to do alteration in a
finished denture
Try-in stage

4. Procedures of
try-in

5. I- Extra- oral examination of trial denture:
- The articulator
- The master cast
- The trial denture bases
- The teeth
II- Intra- Oral examination of the trial denture:
- Upper denture
- Lower denture
- Both upper and lower together
III- Patient Approval:
IV- Protrusive records:

6. I- Extra- oral examination of trial denture:
- The articulator:
* VDO:
* Mounting rings
* Smooth movement
* Locked in centric no other movement
-The master cast: Free from
scratches, air bubbles, wax
debris
- denture base: stable, borders
smooth, round,
- the teeth: shade, form, size,
arrangement , relation to ridge

7. Check the upper denture alone:-
1- extension, stability, retention
2-occlusal plane highet and orientation
Check the lower denture alone:-
1- extension, stability, retention.
2-neutral zone and tongue space.
3-height of occlusal plane.
Check both dentures:-
1- vertical dimension
2-centri occlusion
3- evenness of occlusal pressure.
4- evaluation of esthetics
5- evaluation of phonetics
II- Intra- Oral examination of the trial denture

8. Extension retention
& stability

9. -Checking extension , retention & stability of upper
and lower dentures:-
1- Extension:
•All the peripheries of the denture should be
in the vestibule
•Over extended the denture will move away
from the tissues when the pressure on it is
removed and no retention will be established.
•Under extended the denture won’t remain in
place when the patient opens his mouth.
•This is done by visualization , palpation
•or testing paste

10. 2-Retention of the upper and lower dentures:
-When the patient opens and closes his mouth the denture
must stay in it’s place and considerable force needed to
remove it.
-We have to check the retention of the denture in the
following areas:
1-The anterior part of the denture
(labially)
2-The posterior palatal seal
area (post dam area)
3-Tuberosity region in the upper denture
4-The retromolarpad area in the lower denture.

11. 3-Stability of the upper and lower denture:
- Checking of the stability is done by applying
alternating vertical pressure on one side of the
denture if it rise from the other side this means
that the teeth are outside the ridge in side of the
applied pressure.
- If the denture teeters in the middle it indicates
that the denture is warped in the middle or the
relief area isn’t done properly.

12. Causes of denture instability:
1- The teeth set outside (more buccally) the ridge
2- Warpage of the denture base
3- Unrelieved hard area.

13. Height &
orientation of
occlusal plane

15. tongue space &
neutral zone

16. Setting up of the lower teeth, and shape of the
polished surface should allow proper tongue
function ( in the neutral zone area)
And to avoid the cramped tongue ( Lack of tongue
space)

17. Causes of cramped tongue:
1- posterior teeth set lingual to the neutral zone
2- posterior teeth tilted lingually
3- posterior teeth too broad bucco- lingually
Difference between the movement of the lower
denture caused by cramped tongue and lingual
overextension ?

18. checking both upper
and lower trial
denture

19.  -Watch the point of the chin then request to close the
teeth together this upward movement equals the
amount of the interocclusal distance.
 -When the mandible is in the rest position there should
be an interocclusal space of at least 2mm at the first
premolar but sometimes in some patients may require
more than 2mm.
 -When the teeth are in centric occluding relation the
patient’s face should produce a pleasing appearance.
vertical dimension of
centric occluding relation

20. Proper vertical dimension:
 -Patient should be able to speak without
clicking of the teeth
 -No interference with speech
 -Should be able to swallow
without difficulty.
 -Teeth should be visible without excessive
display of the teeth and denture base.
 -Maintaining desirable facial
expression.

21. -Freeway space:
 -Measuring the occluding face
height and the resting height
should check the amount of the
freeway space.
 -If the patient is struggling to put
their lips together ,there may be
insufficient freeway space
 -If there is too much freeway
space then the patient
will look over closed and show
too little teeth.

22.  - Wrong Vertical:
 In case of too much teeth showing
(which indicates high vertical
dimension) then all teeth will have to be
removed and a new jaw relationship
recorded .wax rims can be added to the
dentures bases and then trimmed to
the desired level.
 Remounting

23.  - Wrong Vertical:
 When the complaint that too little teeth
are visible
 (low vertical dimension) wax can be
added to the occlusal surfaces of the
teeth until a satisfactory amount of wax is
visible. A new centric relation record
should be made and then removing and
re-setting of the teeth to this new position
 Remounting

24. Verification of
centric
relation

25.  -Ask the patient to relax and try to touch the back of the
upper denture with the tip of the tongue and slowly
close the teeth together, making sure the bases are stable
 -Note if the teeth interdigitate accurately exactly like
they do on the articulator
 -This test gives correct information ,when the try in is
made with well adapted base plates
• the trial dentures should remain
in place while the teeth interdigitate
6-Verification of
centric relation

26. Faulty occlusion (wrong centric
relation)
 - Due to an error either in the registration or
mounting the articulator
 - Trial dentures moved from their places due to
poor retention and stability
 - If centric relation is found wrong in the
patient’s mouth a new mouth record of centric
occluding relation is obtained
 - Mandibular cast is detached
and remounted according
to the new record

27. -Remounting the mandibular cast according
to a new mouth record:-
 Remove the mandibular posterior teeth from
the lower trial denture base
 Place soft wax to replace the posterior teeth
 A new record of centric relation is obtained
 The lower cast is detached from the articulator ,
remounted according to the new centric relation
record
 The lower posterior teeth are then set up in the
new position and waxing up is complete
 The trial dentures are ready for a new try in

28. -Remounting the mandibular cast according
to a new mouth record:-

29. Verification For
even occlusal
pressure

30. Even occlusal pressure:
As the teeth come together, they should
occlude evenly with equal pressure.
Testing:
a.Place two thin celluloid strips between the
posterior teeth, any difference in force of
withdrawal
b.Placing the blade of wax knife between
occlusal surfaces

31. Causes of uneven occlusal pressure:
- Unequal pressure during J R ( softening of the
wax )
-Errors in seating record blocks on their
respective casts:
warppage , wax debris, touching record bases
at heal,
- Errors in mounting, interferences at posterior
parts of cast

32. Correction of uneven occluding pressure
 -If it is very slight, it can be corrected by
grinding the teeth after the denture is
processed.
 -If the unevenness is more than slight ,it is
better to take a new centric relation record at
this stage.
 -Remove the lower back teeth ,replace by
softened wax and remount the lower cast.

33. Esthtics &
Appearance

34. • Occlusal Plane Ant.
•Normally : at rest 2mm should be seen.
•Short lip: 5 to 6 mm of the incisors should
be seen.
•Long Lip : may complete
•coverage of the anterior
teeth.
•The plane of occlusion : should parallel
with ala tragus line & in
the front with interpupilary line

35. 1 - FAC E : -
-The face should be studied in front view, in right
& left lateral profile views
-The effect of the denture & teeth alignment
while the face is at rest & while various facial
expression

36. THE FOLLOWING SHOULD BE CHECKED
• The horizontal overlap & its effect on the
contour of the lips.
• The amount of upper incisors showing at rest
& smiles
• The prominence of the upper ant teeth &their
effect of upper lip & nasolabial folds
• The alignment of the posterior teeth & the
amount of support they give to the cheeks

37. 2-TEETH
 CENTRAL LINE : get better idea about the
position of central line
 SHAPA OF TH TEETH: should harmonize with
the shape of the face.
 SIZE OF THE TEEETH: should harmonize with
the size of the face.
 SHADE OF TEETH: should correct & suitable for
the patient
 REGULARITY OF THE SET UP :little irregularity
is usually called for to avoid artificial look.

38. Phonetic test

39. Phonetic tests
 One of the main objectives in complete denture
prosthesis is Correction of speech defects.
 Bad denture produces speech defects due to
one of the following:
1- Improper arrangement of teeth
2- improper contouring of the palat
3- High vertical dimension of occlusion
4- Lack of tongue space

40. Patient
Approval

41. Reference:
•Hassaballa, Clinical Complete Denture Prosthodontics, 2nd. ed.,
King Saud University Academic Publishing and Press, 2010.

42. Thank you