Journal of Osaka Dental University
Online ISSN : 2189-6488
Print ISSN : 0475-2058
ISSN-L : 0475-2058
Retentive force of telescopic Ce­-TZP/A crowns in water
Toshiki NAKAJIMAKatsunori TORIITakamasa FUJIIJunko TANAKAMasahiro TANAKA
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2019 Volume 53 Issue 2 Pages 171-177

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Abstract

We compared the retentive force of telescopic Ce‐TZP/A crowns in water with the force in the dry state. Ce‐TZP/A was used as the material for both the primary and secondary crowns. The half tapered angles of the primary crown were set to 2° and 4°. The retentive force was measured with applied loads of 25, 50, and 100 N on the occlusal surface of the secondary crown. The maximum resistance value during removal of the secondary crown was deemed to be the retentive force. The measurement of retentive force was performed in the dry state and in water for the same sample. The increased retentive force in water with loads of 25, 50 and 100 N was 2.5, 2.5 and 3.3 N, respectively, for crowns at a half tapered angle of 2°. It was 0.8, 1.1 and 2.1 N, respectively, for those at a half tapered angle of 4°. We found that the retentive force of telescopic Ce‐TZP/A crowns in water was significantly greater than in the dry state. When manufacturing telescopic Ce‐TZP/A crowns, it is necessary to consider the influence of saliva to evaluate the retentive force. (J Osaka Dent Univ 2019; 53: 171‐177)

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© 2019 Osaka Odontological Society
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