Sequences of operations
Complete denture
The transfer of occlusal forces – mucosal only.
Tissue supported (born) denture.
Made usually of the acrylic resin - methylmetacrylate.
Sequence of operation
I. phase in dental office
Taking impression (alginate the best choice)
I. phase in dental lab
Pouring: gypsum model
Fabrication of the indivindiual impression tray – shelack or acrylic
II. phase in dental office
Ranging with the special low – fusing wax (the functional tray).This procedure is
done in the patient. The tray must be accurate without any excess, the wax
makes the tray more precise, patient moves with his/her
lips and cheeks – the function is important for the impresiion of details.
After this procedure the tray is called the functional tray
The impression after that is called the functional impression.
During this procedure patient is moving with his/her
lips and cheeks again. The most suitable material is
the zinkoxideugenol paste – a special impression material for edentulous jaws.
II. phase in dental lab
Ranging of the impression with the wax
The border of the functional impression.
must be protected using the wax strip. After that. The bite template is
fabricated as usually using shellack or acrylic for the base, the wall is made of wax. The width of the wax
wall in frontal area is around 8 mm, in posterior area 10 mm.
III. phase in dental office
Registration of the intermaxillary relationship.
The procedure consist
of two steps
1. Vertical relationship. The neck of the patient
is perpendicular to the horizontal plane. The occlusal
plane must be parallel to the bipupilar line in the frontal area and to
nasoauriculal line in the posterior area. The wax walls must be
plain cut, the height is according to the free position
of the mandible. After that the height is
reduced – 2 mm. This is a vertical relationship.
2. Horizontal relationship
The head of the patient
is bent backward and he/she swallows. This can halp us to find the horizontal
relationship. After these procedures the wax walls must be
put together (with paperclips or wax or other material). Ahter the bite registration
in the same phase the colour of teeth is choosen using the colour card (colour shade guide).
III. phase in dental lab
The wax pattern of the denture is made
This is made of wax – base and acrylic teeth are built in it.
according to the registrate using the articulator or occludor.
IV. phase in dental office
The wax pattern of the denture is tried in the patient, the occlusion, aesthetic and fonation are checked.
IV. phase in dental office
The wax pattern is flasked into a four parts flask using gypsum
The teeth are insulated with a special silicone material.
The flask is closed and filled with the gypsum completely.
After the hardening of the gypsum the flask is opened and the wax removed
The wax is removed using hot water. A thin tin foil is put
on some places, esp. on palatal suture in order
to unload them. The insulating agent based on alginate is used.
The flask is filled with the resin dought (mixed of powder and liquid), closed and put into a special cleap.
The resin is polymerized
using the 2,5 hours
polymerization
Schema:
1. During 1 hour reach
the temperature 70°C,
2. 30min interrupt heating
3. During further 30 min increase
the temperature – reach 100°C
4. 30 min stay on 100°C.
After that let the flask cool slowly.
The denture is taken out finished and polished
using special burs, grinding and polishing pastes.
V. phase in dental office
The denture is given over to the patient and the patient is informed how to use it.