Telescopic crowns - from conventional to digital production

In conventional technique, telescopic crowns - also known as double crowns - were usually made of gold alloys or with the help of electroplating technology. With the advent of digital technology, new possibilities have opened up in the field of telescopic crown manufacture, such as zirconium, non-precious metal alloys, titanium or PEEK plastics.

Contents:

  • Telescopic crown
    -    Parallel-walled telescopic crowns
    -    Conical crown
    -    Resilience telescopic crowns
    -    Electroplated crown

  • Telescopic prosthesis
    -    Telescopic bridge
    -    Tertiary structure

  • Advantages

  • Disadvantages

  • Requirements for the preparation

  • Manufacture of telescopic crowns

Telescopic crown

The telescopic crown consists of an inner crown (also known as a primary or inner telescopic) and an outer crown (also known as a secondary or outer telescopic). It is used to attach removable dentures. The remaining teeth are used for anchoring.

Cemented onto the prepared tooth stump, there is a primary telescopic - designed to a minimum thickness according to the material properties. As its name suggests, the secondary telescopic is pushed over the primary telescopic like a telescope and is firmly connected to the removable part of the denture. The two crowns fit together exactly. For this reason, it is essential to ensure that they are inserted in a parallel direction. The wafer-thin saliva film has a positive effect with this technique, as the crowns slide smoothly into one another and an adhesive bond is created between the crowns.

The term telescopic crown is generally used as a collective term for double crowns. These are divided into three specific classes:
 

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

The dentist decides on the basis of the individual conditions in the patient's mouth whether a crown or bridge is possible.
If the stump is still worth preserving, it can be provided with a crown. However, if there is a tooth gap, two abutment teeth are required for the bridge restoration. The restoration is provided by a bridge pontic, which is attached to the adjacent teeth with the help of crowns / bridge anchors.

Advantages of telescopic works

The telescopic prosthesis / bridge can be extended to a full prosthesis if additional teeth are lost. Older people in particular, who generally find it difficult to adapt to the dental prosthesis, can get used to the foreign body in their mouth more easily. Removing the prosthesis also makes cleaning easier. In contrast to other dental restorations, the prosthesis can be used for a long time.

In the upper jaw, the telescopic prosthesis can in some cases avoid a palate plate, which many patients find more pleasant.

Since this type of restoration is completely coated with resin, it comes aesthetically very close to the natural dentition and is therefore very popular.
 

Disadvantages of telescopic works

The biggest disadvantage are probably the relatively high costs, since two crowns have to be made for each tooth during production. In addition, it can only be technically implemented if the work is done very precisely.

Requirements for the preparation for telescopic crowns

A lot of space has to be created for telescopics. As a guide, it is recommended to plan two metal thicknesses of 0.3-0.4mm each and the corresponding veneer of 0.8mm.

The transition from artificial to natural tooth crowns must be harmonious and correspond to the anatomy of the tooth. When preparing two or more teeth, a uniform insertion direction must be ensured.

As a result, a more delicate, aesthetically high-quality work can be created and it enables the patient to incorporate the dentures more easily.
 

digitaler Modellguss in PEEK

Manufacture of telescopic crowns

The digital age has also created many new opportunities in dental technology. Telescopic crowns - manufactured digitally - set this technique to new quality standards. In the meantime, internal telescopic are designed in the CAD software. With just a few clicks, the telescopic can be quickly implemented and circularly in a constant thin wall thickness. Laborious measuring and thinning of the crown are a thing of the past. Steps or cone angles can also be quickly and easily integrated into the construction. A wide variety of manufacturing processes and materials are available for the CAM process. 

The customer can choose between telescopics that are manufactured using LaserMelting or subtractive processes. A wide variety of materials is available, from classic cobalt-chrome, titanium and gold to zirconium and PEEK.

In conventional production, the work depended on the precision of the dental technician and his modeling. Problems with the conventional manufacture of telescopic crowns included faulty casting processes, distortions and poor friction. Precise work can also be carried out by the dental technician in digital production. But even if digitization has simplified a lot and some difficulties in the manufacture of telescopic crowns are a thing of the past, there are new challenges that dental technicians have to face.

Telescopics manufactured by LaserMelting have, for example, a different, unfamiliar optical surface that you have to get used to. The workflow has been rethought from analog to digital and, depending on the parameters found, brings with it many new possibilities.

If you have any questions about CAD/CAM manufactured telescopic work, please do not hesitate to contact our experts. We will be glad to advice you on an equal footing!