Co-Cr Material Telescope Crowns Precision Attachment Stabilizing
Telescopic copings have been used for several years in oral
rehabilitation of patients with advanced periodontal disease.
Patients with periodontal disease undergoing prosthetic
reconstruction often present with teeth with minimal supportive
tissue and increased tooth mobility.
Therefore, it is extremely important for the prosthesis not to
cause periodontal destruction or worsen an existing periodontal
Three different types of double crown systems are used to retain
RPDs. They are distinguished from each other by their retention
- Cylindrical crowns that exhibit retention through friction fit of
- Conical crowns or tapered telescopic crowns that exhibit friction
only when completely seated using a “wedging effect.” The magnitude
of the wedging effect is mainly determined by the convergence angle
of the inner crown; the smaller the convergence angle, the greater
is the retentive force
- Double crown with clearance fit (hybrid telescope or hybrid double
crown) exhibits no friction or wedging during insertion or removal.
Retention is achieved by using additional attachments or
functional-molded denture borders.
- Creation of a common path of insertion
- Easy to perform routine oral hygiene
- Rigid splinting action
- Distribution of stresses to the abutment teeth
- Provision of suitable abutments for RPDs even when the remaining
teeth are periodontally compromised
- Much easier insertion and removal for the patient
- Accommodates future changes in the treatment plan
- Psychologically well-tolerated by patients.
- Increased cost
- Complex laboratory procedures
- Extensive tooth reduction required
- Increased number of dental appointments
- Difficulty in achieving esthetics
- Retention diminishes after repeated insertion/separation cycles
- Readjustment of retentive forces is difficult.
Although fixed restoration provides favorable conditions for
preservation of oral function, telescopic overdenture may be
considered as another option, combining good retentive and
stabilizing properties with a splinting action. The telescopic
system may therefore be seen as providing suitable abutments for
overdenture even when the remaining teeth are compromised. For
other prostheses, excellent oral hygiene maintenance is essential
for an optimal prognosis. With telescopic construction, apart from
the splinting of the abutment teeth with the telescopic system, the
gingival tissues are easily accessible around the entire marginal
circumference of the abutment, thus permitting easy home care and
oral hygiene. However, correctly implemented plaque control is
fundamental in the prevention of recurrence of gingivitis.