title: Clinical performance and satisfaction of removable prostheses with self-adjusting magnetic attachments.
abstract: BACKGROUND
  Conventional magnetic attachments have rigid assemblies and are unable to compensate for the movement of the prosthesis under function, which may result in the deepening of periodontal pockets and an increase in the mobility of abutment teeth.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the clinical performance and satisfaction of participants with removable prostheses with self-adjusting magnetic attachments that allow vertical and rotational movement.
  
  
  METHODS
  The clinical performance of 17 prostheses with 22 self-adjusting magnetic attachments in 16 participants was analyzed for a mean of 3.1 years. Periodontal indices, including probing pocket depth and tooth mobility, were measured at denture placement (baseline) and from 0.5 to 5 years after insertion. Control data were obtained from the remaining teeth, which were restored by resin or metal coping. Prosthetic parameters, including the reduction of retention in self-adjusting magnetic attachments, reline, or fracture of dentures, were also recorded. A visual analog scale questionnaire on participant satisfaction with stability, comfort, and cleaning of the prostheses was completed. The Wilcoxon signed rank test and 1-way analysis of variance (α=.05) were performed on data collected at the time of prostheses placement and final follow-up evaluation.
  
  
  RESULTS
  No significant differences were found in terms of probing pocket depth and tooth mobility between the baseline and postinsertion data for self-adjusting magnetic attachments and control teeth. Retention in all prostheses was stable, without reduction. Higher visual analog scale scores for "easy cleaning" were noted.
  
  
  CONCLUSIONS
  No significant difference between baseline and postinsertion was noted regarding the periodontal condition of self-adjusting magnetic attachments and control teeth with resin or metal coping materials.
authors.affiliation: Assistant Professor, Department of Prosthodontics, School of Dentistry, National Taiwan University, Taipei, Taiwan.
authors.forename: Tsung-Chieh
authors.initials: TC
authors.lastname: Yang
authors.affiliation: Professor, Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan. Electronic address: ymaeda@dent.osaka-u.ac.jp.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Maeda
authors.affiliation: Assistant Professor, Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Gonda
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003774:Dental Plaque Index; D019232:Dental Restoration Failure; D003779:Denture Design; D003823:Denture Rebasing; D003781:Denture Retention / Q000295:instrumentation*; D003824:Denture, Complete; D003828:Denture, Overlay; D003832:Denture, Partial, Removable; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D059346:Magnets; D008297:Male; D008875:Middle Aged; D009910:Oral Hygiene; D017060:Patient Satisfaction; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000145:classification; D014086:Tooth Mobility / Q000145:classification; D016896:Treatment Outcome; D064232:Visual Analog Scale