Determination of the centric occlusion

The main challenge for the physician on this second clinical, is the correct definition of the lower jaw to the top in three mutually perpendicular planes, which ensures optimum functional and aesthetic prosthesis for rehabilitation and treatment. Major operating elements aimed at achieving this goal are:

1. Determination of the occlusal (prosthetic) plane.

2. Determining the height of the lower part of the face (the height of the bite).

3. Determination mesio-distal position of the lower jaw.

4. Central Locking Bite.

Determination centric done with wax bases and occlusal ridges. Supporting guidelines for constructing the elements bite (the vestibular surface of the relief decoration roller center line, the line of canines, smile line) are defined and applied to the occlusal ridges during the determination of the central occlusion. As a basic material used primarily wax, and only with significant atrophy of the alveolar processes, as well as a small mouth slit, prepare the bases of plastic.

To wax bases and occlusal rollers meet the following requirements:

a) The bases should be made of high quality hard wax with a relatively high softening point;

b) bases shall fit the models throughout their length, gapping bases to the model leads to incorrect zagipsovke models in the articulator in future improper closing of artificial teeth;

c) edge wax bases must be rounded, without sharp edges, they should be just pressed on the model, respectively relief neutral (valve) zone, that is to be voluminous, elongated, overly thick or sharp edges bases cause discomfort or pain, which leads to errors in determining the centric;

d) bases should be reinforced with wire, to prevent the possibility of deformation, on the basis of the upper jaw wire should be laid in the first place on the border of the hard and soft palate, as it is the most vulnerable area for the strain;

e) occlusion rollers must be monolithic, as the rollers are made of wax platelets may flake, making it difficult (cast rolls can be prepared by melting the wax in the form of a certain height);

f) The rollers must be sufficiently high and wide, fast and comfortable during dissection rollers cut them with wax than layering it, the height of both cylinders should be within 4 cm, width of the roller should be in the range of 8-10 cm, the front portion of the upper roller should be positioned at a distance of 8 +2 mm anterior to the incisive papilla. The width of the upper and lower roller in the front section should not exceed 3 mm (top);

g) the upper occlusal roller accordingly should be cut at an angle to the side of the maxillary cusps, otherwise mucous tubercles of the lower jaw may balk at these sites roller that shifts the basis and its deformation;

h) check clinging wax bases, which depends on their snug fit to the tissues of the prosthetic field and exact match basis relief edges of the neutral zone. If the basis balances only on the jaw, it is a sign of deformation functional impression.

Eliminate the balance in this case, the only way of obtaining a new imprint jaw. If the deformation of the bite basis arose in the course of its production laboratory, he is balancing on the model jaw. In such cases, you can eliminate the balancing basis, loaded it with a roller for 1 minute. In warm water and then press it to the model. Lack of functional clinging bases may be due, breach of density basis to fit the edges of the central (valve) zone. Need to test the limits of the basis, as the vestibular and the oral part.

Date: 2015-01-02; view: 1530