Retention of removable partial denture with double crowns

Abstract

The aim of this paper is to explain the mechanisms of retention with double crowns, examine the possibility of improving the process of measuring the forces of separating double crowns and suggest the measures for optimizing the retention forces with telescopic partial dentures. After the manufacturing of a partial denture with double crowns, it can only be established whether if the retention force is strong enough or not, but its nominal value remains unknown. Optimally it should be between 5 and 10N per anchor. Too strong retention force of partial denture causes traumatic damages of periodontal tissues, when taking the denture off, while not enough strong retention force doesn't connect the partial denture to the supporting tissues tightly enough. The paper describes the mechanism of retention with telescope and conus crowns and the way of measuring the force of their separation. For the purpose of optimizing the retention force, the ways of reducing exceedingly strong and increasing insufficient force were described. The necessity of being acquainted with the nominal value of the retention force of telescopic denture and its bringing to within the borders of optimal force is stressed in the conclusion.

Cilj ovog rada je objasniti mehanizme retencije kod dvostrukih kruna, ispitati mogućnost unapređivanja postupka merenja sila razdvajanja dvostrukih kruna i predložiti mere za optimizaciju retencione sile kod teleskop parcijalnih proteza. Po završenoj izradi parcijalne proteze sa dvostrukim krunama jedino se može zaključiti da li je retenciona sila dovoljna ili ne, ali njena nominalna vrednost ostaje nepoznata. Optimalno ona treba da iznosi između 5 i 10N po pojedinačnom sidru. Prevelika retenciona sila parcijalne proteze uzrokuje traumatska oštećenja potpornog aparata zuba nosača, pri skidanju proteze, dok nedovoljna retenciona sila ne vezuje parcijalnu protezu za noseća tkiva u dovoljnoj meri. U radu je opisan mehanizam retencije kod teleskop i konus kruna i način merenja sile njihovog razdvajanja. U cilju optimizacije retencione sile opisani su načini redukcije prevelike, odnosno povećanja nedovoljne sile. U zaključku rada se ističe neophodnost poznavanja nominalne vrednosti retencione sile teleskop proteze i njeno dovođenje u granice optimalne sile.