Analiza wartości siły retencji na drodze rozłączania koron teleskopowych w układach trójelementowych wykonanych w technologii CAD/CAM

*Anna Kochanek-Leśniewska¹, Andrzej Majcher², Elżbieta Mierzwińska-Nastalska¹

Summary
Introduction. The three-element telescopic crowns system is a modification of the traditional system. There is an intermediate element which wear during use dentures mounted between the primary and secondary crowns. The telescopic crowns components can be made in various technologies e.g. CAD/CAM technology.
Aim. The aim of the study was to analyze changes in the retention force on the way disconnecting telescopic crowns as a function of load cycles in three-element systems made using CAD/CAM technology.
Material and methods. Material consisted of 6 three-element telescopic crowns systems in which the primary and secondary crowns were made using CAD/CAM technology and provided with two types of direct elements, and 3 crowns systems as a control group made a cast and electroforming. Systems have been tested in Institute for Sustainable Technologies in Radom.
Results. The results are shown in the form of graphs of retention force as a function of the displacement telescopic crowns during their separation in the range 0-25 000 load cycles. The results were not statistically significant, but the graphical analysis indicated tendency to distribution of the relationship between the retention force by disconnecting the crown and the type of intermediate element.
Conclusions. It seems that the retention force distribution during disconnecting crowns largely depends on the contacting surfaces. Retention telescopic crowns made of different technologies may be variably sensitive to the crown geometry. The new associations in material systems telescopic crowns may appear isolated systems, the characteristics of which will differ from the characteristics of the group.

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