title: [The measurement of retentive forces in mandibular complete overdenture with Magfit magnetic attachments].
abstract: OBJECTIVE
  To evaluate the in vivo retentive forces of mandibular complete overdenture with Magfit attachments, as well as the relation between the location of magnetic attachments and the retentive forces of the denture.
  
  
  METHODS
  5 patients were selected and treated with mandibular complete overdentures retained by Magfit EX600 and MD800 attachments. A strainometer was used to measure the retentive forces in anterior, central and posterior parts of the overdenture before and after magnets were set. The vertical and anterior-upper 60 degrees retentive forces of the overdenture were measured one month later.
  
  
  RESULTS
  The retentive forces of the overdentures after setting magnets were significantly greater than that before magnets were set (P < 0.05). There was no significant difference in retentive forces between the different parts (P > 0.05). The retentive force in vertical direction was greater than that in anterior-upper 60 degrees direction (P < 0.025).
  
  
  CONCLUSIONS
  Magnetic attachments can significantly improve the retention of mandibular complete overdenture. The location of magnetic attachments greatly influences the retentive force of the overdenture.
authors.affiliation: Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Li
authors.initials: L
authors.lastname: Du
authors.forename: Chun
authors.initials: C
authors.lastname: Xu
authors.forename: Yonglie
authors.initials: Y
authors.lastname: Chao
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017267:Dental Prosthesis Design / Q000379:methods; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D003799:Dental Stress Analysis; D003834:Denture Precision Attachment; D003826:Denture, Complete, Lower; D003828:Denture, Overlay; D004574:Electromagnetic Fields; D005260:Female; D006801:Humans; D008280:Magnetics / Q000295:instrumentation*; D008297:Male; D008422:Materials Testing; D013314:Stress, Mechanical