[Comparison of the difference of the magnetic force by cast post-keepers combined with three different metals].
OBJECTIVE
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.


CONCLUSIONS
The magnetic force of the keepers combined by three different metals decreased to certain degrees, the keeper combined by gold alloy decreased the least.
Zhao
Jun
J
Department of Prosthodontics, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
Wei
Bin
B
Li
Ying
Y
D002858:Chromium Alloys / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D060328:Magnetic Phenomena; D008670:Metals; D014025:Titanium / Q000737:chemistry
D002858:Chromium Alloys; D003722:Dental Alloys; D006047:Gold Alloys; D008670:Metals; D014025:Titanium