The telescopic crown is a two-piece construction: primary and secondary. It is used primarily for fixing removable dentures. The primary part is a metal cap. The secondary crown is fixed on the frame of the prosthesis. When connecting the two parts, a sturdy structure is formed. With its help, it is possible to form a strong fastening of prostheses, which at the same time will be easily removable.
Varieties of telescopic crowns
This mechanism was first tested in Germany at the beginning of the last century. The telescopic crown owes its name to its resemblance to a telescope. Its components move in the same way relative to each other. Over almost a century of history, this design managed to prove its practicality, ease of use and good aesthetics. Nowadays, telescopic crowns can serve as an excellent alternative to implant prostheses.
There are two varieties of this design - cylindrical crowns and conical. Basically, they differ in appearance. The very first samples of telescopic crowns were made by craftsmen with cylindrical walls. They are characterized by a fairly tight fit. Today, such a design is advisable to use only among patients with absolutely healthy gums.
The telescopic conical crown is an improved cylindrical version. Its main advantage is the absence of the influence of errors that are possible at the manufacturing stage. This design does not allow distortion or jamming when fixing the prosthesis. The main disadvantage of the improved system is the possibility of disconnecting crowns in contact with food.
The benefits of telescopic crowns
What positive aspects can be noted in the application of this design?
- Chewing load is evenly distributed on all teeth and gums.
- No effect on diction and bite.
- Possibility of installation on implants.
- Long service time.
- Easy to use and maintain.
- Maintaining tooth health for a long time.
These are not all the advantages of telescopic crowns. Everyone can note for themselves the positive aspects of using the design.
Disadvantages of telescopic crowns
Among the main disadvantages of this design can be noted a long manufacturing period and high cost. However, negative aspects are fully compensated by the above advantages of crowns.
Indications for installation
The use of telescopic crowns is advisable in the following cases:
- the presence of periodontal disease and loose supporting teeth;
- there is no financial opportunity to install implants;
- too few teeth for castle clasp prostheses.
The need to use this design is still determined by the doctor.
Telescopic crowns: manufacturing steps
The production of the design described in the article today is possible in two ways: stamping and casting. The first method is considered the simplest. However, when using casting, it is possible to obtain a more attractive appearance of the product due to processing with modern materials.
The manufacture of telescopic crowns begins with turning the patient’s teeth under the inside of the structure. Then the specialist takes the casts and sends them to the laboratory. There, technicians are already making models for them and making caps. It is very important to check the parallelism of the walls of the abutment teeth so that the structure fits exactly. After trying on the caps, they form a plaster cast for casting the future model. An external crown is made taking into account a gap of 0.5-1 mm. According to the resulting print, an external structure is already being made.
Cost and Life
A telescopic crown is considered a relatively expensive treat. Its cost can vary from 5 to 11 thousand rubles. If we talk about complete prosthetics, the final price will depend on several factors at the same time (material used, number of abutment teeth, etc.). It is not possible to precisely name it.
Clasp dentures on telescopic crowns are characterized by a short service life - not more than 10 years. To increase it, you must periodically visit a doctor and monitor the work of the structure.