[Analysis of retention of 3 different aesthetic Co-Cr-Mo alloy clasps on premolars].
OBJECTIVE
To analyze the retention of 3 different Co-Cr-Mo alloy clasps on premolars, and provide information for clinical design of aesthetic clasps.


METHODS
An EZ20 force measuring instrument was used to record the retention of Co-Cr-Mo alloy casting aesthetic clasps when they were dislodged from undercuts of different depths (0.25, 0.50, 0.75 mm) on premolars. The data were analyzed with SPSS 22.0 software passage.


RESULTS
The clasp retention in groups of 0.25 and 0.5 mm undercut was three-arm clasp > varied Y-shaped clasp > modified RPI clasp. In the group of 0.75 mm undercut, the clasp retention was varied Y-shaped clasp>three-arm clasp>modified RPI clasp after circulations.


CONCLUSIONS
A varied Y-shaped bar clasp of 0.75 mm undercut depth is suitable for premolar both for its adequate retention and aesthetic effect.
Shanghai Stomatological Hospital. Shanghai 200031, China. E-mail:15800714355@163.com.
Xue-Ying
XY
Wu
Qun
Q
Zhong
D001641:Bicuspid; D002858:Chromium Alloys; D003722:Dental Alloys; D016734:Dental Clasps; D003799:Dental Stress Analysis; D003781:Denture Retention; D003832:Denture, Partial, Removable; D004954:Esthetics; D006801:Humans; D014800:Vitallium / Q000737:chemistry*
D002858:Chromium Alloys; D003722:Dental Alloys; D014800:Vitallium