Dental Screws in Dental Implant Prosthodontics Part 4 of 4

Classification based on the positions of the screw assembly.

Screw assemblies in two adjacent abutments
This method may be used to connect two cast crowns, two roots or a cast crown and a root.

Screw assemblies in the removable section of a combined prosthesis
The fixed part of the prosthesis is cemented in the usual manner and the removable part is then screwed to the fixed component. In this way it is possible to construct a prosthesis on divergent abutments.

Screw assemblies in the removable section of a combined prosthesis.


Screw assemblies in the fixed part of a combined prosthesis
This technique requires double copings on the abutment, the inner coping being cemented to the abutment and the outer coping subsequently screwed onto the inner coping. A removable prosthesis is then fitted over the outer coping. While the outer coping is screwed in place and can be removed by the dentist. It is covered by the removable section of the prosthesis that can be taken out and inserted by the patient. This is a multipurpose screw system that can be employed when bar attachments and even implants are constructed.

Screw assemblies in both fixed and removable parts of a combined prosthesis.
This system is too specialized and complicated to have many applications in dental pratice.

Other Classification of Dental Screws:

Reference
Matsuo E, (1981): Screw Retained Dental Prosthesis, Quintessence Publishing Ed. 1.

Written by:
Jesus Lecitona+
Dental Implants Cost website – http://costofdentalimplant.com/
PDA Information Committee Member
PDA Pangasinan Chapter
PDA San Juan City Chapter

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