[In vitro comparison of the retention adjustment of telescopic crowns].
OBJECTIVE
The objective of the present in vitro study is to explore the retention readjustment measure of the non-precious metal telescopic crown.


METHODS
Twenty-seven standard size dies were divided into three groups randomly, conventional Co-Cr alloy group, Co-Cr alloy slit telescopic crown group and Au-Pd alloy group. Each group had 9 dies. The retentive force of telescopic crowns was investigated after repeated insertion/separation tests. Statistical analysis was performed using SPSS12.0 software package for one-way ANOVA.


RESULTS
The retention of Au-Pd crown group and Co-Cr alloy slit telescopic crown was significantly larger than that of conventional Co-Cr alloy crown group. The maximal retention of Co-Cr alloy slit of the telescopic crown group was significantly larger than Au-Pd crown group. Compared with Co-Cr alloy slit telescopic crown group, the retention of all procedures in Au-Pd crown group had statistical significance except the retention of 800 procedures.


CONCLUSIONS
The retention of slit telescopic crown is similar to precious mental telescopic crown. Slit telescopic crown can compensate the retention deficient of none-precious metal telescopic crown. Supported by Science and Technology Research Project of Bureau of Health of Jiangxi Province (Grant No.060436).
Shi
Xiao-Feng
XF
Department of Prosthetic Dentistry, Stomatological Hospital Affiliated to Nanchang University, Nanchang 330006, Jiangxi Province, China.
Zeng
Li-Wei
LW
Yu
Si-Hua
SH
D003442:Crowns; D006801:Humans; D066298:In Vitro Techniques