[Comparison of the difference of the magnetic force by cast post-keepers combined with three different metals]
1Department of Prosthodontics, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
Purpose:
Three different metals were used to make cast post-keepers of magnetic attachment. The magnetic force was tested and analyzed.
Methods:
The cast-post keepers were combined by gold alloy, Ni-Cr alloy and Ti metal respectively. 12 samples were divided into three groups, 4 in each. Root surface structures were manufactured by these samples. The values of the magnetic force of the magnetic attachment were tested and compared using ANOVA.
Results:
The average value of the attractive force of the keeper combined by gold alloy was 4.84N, while that of the keeper combined by Ni-Cr alloy was 4.61N and the keeper combined by Ti was 4.12N. Significant difference was found between each two samples, P<0.01.
Conclusion:
The magnetic force of the keepers combined by three different metals decreased to certain degrees, the keeper combined by gold alloy decreased the least.
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