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/Objection. Recently, new materials for double crowns have been  introduced, such as zirconia and polyetheretherketone (PEEK). However, some  characteris-tics of these materials are not investigated sufficiently such  as retentive force and duration of “settling in phase”. During “settling in  phase”, telescopic overdenture has not yet achieved its definitive retention  force, and it can be harmful for periodontal tissue if the value is above  optimal for long time. Objective was to measure the in-vitro overall  pull-off force of telescopic crowns where primary crowns were made from  zirconia ceramics and a survey of the „settling in phase” duration. Methods. Forty zirconia primary telescopic crowns were produced on prepared  canine teeth. Twenty secondary crowns were of PEEK and other 20 of zirconia  with electroplated gold copings. The pull-off force measurements were  conducted utilizing a dynamometer until a constant value was obtained. Results. The specimens of the PEEK group showed higher initial retentive  force values. Settling in phase was finished between 800 and 900 cycles of  separation for both groups. Comparing the value of pull-off force between  individual different cycles, a statistically significant reduction was  recorded up to the 800th cycle, while between the 800th and 900th cycle  there was no difference. Conclusions. The settling in phase was finished  between 800 and 900 cycles of separation in both groups. Final retentive  force values for both tested telescopic groups were in the optimal range  which is 5-9 N per one telescopic crown.

Retention force of overdenture retained with telescopic crowns: A comparison of polyether ether ketone and zirconia ceramic telescopic crowns