The measurement of retentive force of laser-melted and cast post-keepers of Magfit magnetic attachments.
- Author:
Ling YANG
1
;
Li DU
;
Yinghe LIN
Author Information
- Publication Type:Journal Article
- MeSH: Dental Alloys; Dental Casting Investment; Dental Casting Technique; Dental Prosthesis Retention; instrumentation; Dental Soldering; methods; Denture Precision Attachment; Electromagnetic Fields; Lasers; Magnetics; instrumentation; Post and Core Technique; Stainless Steel; Welding; methods
- From: West China Journal of Stomatology 2003;21(5):386-388
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVEIn order to compare the influence of casting and laser welding on magnetic retentive force, the magnetic retentive forces of laser-melted and cast post-keepers of the magnetic attachments were measured in vitro.
METHODS5 cast and 6 laser-melted post-keeper specimens (Magfit MD800) were formed, respectively. Using untreated keeper as control group, the vertical magnetic retentive forces were measured by a universal testing machine.
RESULTSThe average vertical magnetic retentive force of the laser-melted post-keeper group and the cast post-keeper group in vitro were (4.223 +/- 0.217,0)N, (3.792,9 +/- 0.296,4)N, respectively. Compared with the cast post-keeper group, the average vertical magnetic retentive force of the laser-melted post-keeper groups was much higher in vitro (P < 0.05).
CONCLUSIONLaser welding had less influence on the magnetic retentive force of the magnetic attachments than casting.
