1. Increase the efficacy of fixation and we use them to fix removable prostheses. The preconditions of their creation are the adequate number and statement of teeth. Telescopic crowns have two parts; The primary crown is fixed on brushed teeth with cement and the secondary crown is situated in the removable denture and is the accurate negative duplication of the primary part. Primary and secondary parts interlock like key and lock and the efficacy of fixation is guaranteed by joint crown-walls.

2. Fixation allows excluding the possibility of unequal chewing function distribution and molar loosening. A telescopic crown consists of two crowns. The first is a metal capsule that is put on prepared tooth. The other is a part of removable prosthesis that copy the form of the first part inside and the natural tooth outside.

3. Can give more favorable axial force load, they give the best overdenture stability. The advantage of such systems is that they need less correction and interventions after the completion of work. It seems that two implants with telescopic crowns and an overdenture should be an optimal protocol for edentulous mandible.

4. A partially removable denture (dentures with telescopic crowns and attachments) will be supported not only by patients' gums, but also by the roots of their retaining teeth(even decayed).