| JOURNAL OF OSAKA DENTAL UNIVERSITY | |
| Vol. 42 No. 1 APRIL - 2008 | |
| ISSN: 0475-2058 UBIC: 172 | |
SUMMARY |
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| We investigated the change in retentive force of electroformed telescope crowns over the long term by analyzing
the retentive force curve during 10,000 cycles of vertical insertion and dislodgement of ten outer crowns using a tensile and compression
testing machine. The peak retentive force, the peak pushing force and the duration of retentive force were measured. No significant differences
were found during 10,000 cycles in the peak retentive force, the peak pushing force or the duration of retentive force. The retentive
characteristics of electroformed telescope crowns did not change after the 10,000 cycles. Our results clarified that the electroformed
telescope crown could be used as an effective retainer over the long term. (J Osaka Dent Univ 2008; 42: 89-93)
Key words: Electroforming; Telescope; Retentive force; Attachment; Time factors. |
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