Clasp by injection molding of plastic.

Constantly emerging issues of technicians at the manufacturing method of injection molding clasp prompted me to write a little explanation.

To begin with indications and contraindications, as well as the possible structures.
Clasp method of injection molding (hereinafter plastic clasp) are sufficiently broad in scope. In principle, they can be of any prosthetic appliance dentition defect, due prosthetics partial removable dentures. Well under contraindication is the lack of support at the equator teeth, most often seen in the molded crown.

Relative contraindication is deep sky as possible not a tight seal of the arc to the mucosa in the palatal suture. However, using special techniques for this problem can be avoided

Frequently asked question, and whether a prosthetic appliance with plastic clasp with periodontal disease, and especially if the teeth are mobile?

From my experience I can say: you can, and if there is a need for splints, you can get a great result as an aesthetic and therapeutic, using vestibular arc and mnogozvenevye denture clasp. (Changeover denture clasp not recommend.)

Fearing removal of mobile teeth during removal clasp is not worth it.
Which color to choose red or white?
We can offer you two colors of red and seven white flowers. But I would like to draw your attention to the fact that the white plastic on the teeth are not very similar (it is not transparent) and often looks like a tooth stuck to a piece of bread. Red plastic, it is close enough in appearance to the gum and looks more quietly, but Klammer of red plastic to visually shorten the reference tooth.

How to get prints?
Any silicone material. The impression must be double-layered. Prosnimaetsya all orthopedic bed.
In print, a dental technician must obtain a model (IMPORTANT!) Of gypsum super class 4! Warning The model should be a super plaster cast as a whole (and the basement too).

Skeleton clasp is cast on the refractory model and on the master model must be prepared for duplication.
In preparing the model for the duplication is not necessary to use parallelometr! Preparation of the model lies in the isolation clasp wax layer of 1-2 persons under the saddle. When the terminal defects do not forget to make stops in the saddle as the holes in the insulation in the seventh teeth.



Must simulate Stoppers basis! Limiter basis should Byl modeled at an acute angle. Close undercut wax on the teeth it is not necessary, especially supporting the teeth. Dubl-model must be thoroughly dried at a temperature of 250 ° C for at least 10 minutes. (Models ordered in our laboratory are subjected to such treatment).

Modeling framework clasp!
Frameworks to simulate the wax does not contain persistent dyes, is perfect for these purposes "Base wax -02" and "Clasp-02" firm "Stoma" Kharkov.
Warning Do not use the profile wax clasp works as well as wax for the non-removable prosthesis, because they are usually painted with dye-resistant, which can lead to discolouration of plastic skeleton.

How thick should the plastic frame clasp?
Let's start with the lower jaw.
The arc of the lower jaw must be a minimum thickness of 2 mm but not more than 3 mm, a width of not less than 6 mm but not exceeding 10 mm. Perfectly suited for modeling of the arc of the mandible wax "wax Base -02". Take a strip of wax base width of 7-11 mm warm-up, lay on the model Mezhuyev necks of teeth and the transitional fold, firmly press the model, rounded edges on the strip and makes an arc shape as shown in the figure. Do not forget to take into account the modeling further processing and polishing.
Warning Do not turn, frame clasp to denture bases, it is not necessary.



Klammer run right by the neck of the tooth, focus on the equator do not have to, and use parallelometriyu too. Shoulder width Klammer from 1,5 mm to 4mm. Thickness from 1,5 mm to 2,5 mm. Occlusive lining minimum thickness of 1 mm.

The most preferred denture clasp for plastic clasp, Klammer Ney number 1.
Least preferred denture clasp for plastic clasp, Klammer Bonvilya, as well as Roach and throw kogteobraznye denture clasp. Saddles are modeled from two or three plates of wax "Clasp-02" firm "Stoma" Kharkov holes in the saddle, on the wax model is not necessary, it can interfere with quality casting frame. (Distention drill holes in the saddle in the final frame). Be sure to model the constraints bases. Make sure that the internal and external constraints are not placed against each other.
Warning When modeling framework wax give a small allowance for processing and polishing of plastics.

The upper jaw.

                                                                                                                                              
In preparing the model to duplicate, note the depth of the sky! In the deep sky, make sure to engrave on the edge of the base of the arc, the depth of engraving in the palatal suture to 0,5 mm and decreases to the alveolar bone OD 0,25 mm. In preparing the model for the duplication is not necessary to use parallelometr! Preparation of the model lies in the isolation clasp wax layer of 1-2 persons under the saddle. Must simulate Stoppers basis! Limiter basis should Byl, modeled at an acute angle. Close undercut wax on the teeth it is not necessary, especially supporting the teeth.

Modeling frame clasp the upper jaw, start with packing saddles two of the three plates clasp wax.
The arc of the upper jaw must be a minimum thickness of 2 mm in the ribs, but not more than 3 mm, a width of not less than 10 mm but not exceeding 30 mm.

Warning Do not turn, frame clasp to denture bases, it is not necessary.

For modeling of the arc of the upper jaw is very convenient to use wax "Clasp-02" firm "Stoma", Kharkiv. In the beginning: in the middle of the arc Generate stiffener and pour wax caps bases.


In order to lay on the sky warmed plate clasp wax indentation from the edge of the arc 4-5 mm trim the wax by repeating the contour of the arc. Repeat again, but this time, reducing the indent edge of the arc up to 3 mm. Take the third disc clasp wax, heating, lay at the sky firmly press the wax on the edge of the arc.

Then gently push the plate to the rest of the arc so as to form a smooth transition from the edge of the arc to the ribs and the ribs to the edge of the arc. Trim the wax on the edge of the arc and flow to the model. Generate limiters basis, make sure that the internal and external constraints are not placed against each other.

Klammer run right by the neck of the tooth, focus on the equator do not have to, and use parallelometriyu too.
Shoulder width Klammer from 1,5 mm to 4mm. Thickness from 1,5 mm to 2,5 mm.
Occlusive lining minimum thickness of 1 mm.

A few words about unilateral Partial dentures (butterfly)!


The photo you see unilateral

Partial dentures. (Butterflies).


If minor defects of the tooth 1.2, where the future will not need relocation, you can immediately install an artificial tooth in wax frame clasp. This applies not only to unilateral clasp, but other structures. The main thing you need to take into account the fact that the plastic frame is connected to the plastic artificial teeth only mechanical, chemical bonding is absent. For this we must create in his mouth, diotaricheskie holes (these are holes in which the narrow entrance and extended cavity).

Tooth with diotoricheskimi holes.

Also I would like to draw your attention to the fact that the preparation of a model set of teeth in the case directly to the frame there is no need to isolate alveolar process, as well as denture bases itself will be a skeleton. And most important to remember that in the beginning you need to model denture clasp and other elements of the frame, and then pripasovat to the wax frame plastic tooth.

Note that when pripasovke teeth can reduce the thickness of Klammer and other items (can break), but you must select a tooth in place for the frame.