Five-year clinical trial using three attachment systems for implant overdentures

Clin Oral Implants Res. 2014 Feb;25(2):e171-8. doi: 10.1111/clr.12086. Epub 2012 Dec 21.


Objective: The objective is to compare, in a prospective randomized clinical trial, three types of attachment systems for mandibular implant overdenture, focusing on costs, maintenance requirements and complications from baseline to the end of 5-year follow-up period.

Materials and methods: Sixty-nine fully mandibular and fully/partially maxillary edentulous patients received two screw-type Straumann implants, in the mandibular canine region. New overdentures with three types of attachment systems were inserted according to an early-loading protocol: Group B (balls, divided into Subgroup B.1 - retentive anchor with gold matrix and Subgroup B.2 - retentive anchor with titanium matrix) (n = 23), Group M (magnets) (n = 23) and Group L (locator) (n = 23).

Results: The highest maintenance event number (195) was observed in Group B vs. 31 in Group L and 15 in Group M. Significantly more complications were recorded in Subgroup B.1 than in Subgroup B.2, Group M and Group L (P < 0.05). Group M registered the highest prosthetic success (82.6%) in the 5 years, followed by Group L (78.2%). Subgroup B.1 had the lowest success rate (50%). The magnet group recorded statistically significant higher costs, comparing with the other two groups (P < 0.05).

Conclusions: The three attachment systems functioned well after 5 years. The magnets had a low maintenance requirement and high success rate, despite the relatively increased initial costs. Retentive anchor with titanium matrix and locator may be a better choice from a financial point of view, taking into consideration the initial low cost of the components and also the reduced number of complications.

Keywords: complications; costs; locator; magnet; prosthetic maintenance; retentive anchor.

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Costs and Cost Analysis
  • Dental Prosthesis, Implant-Supported*
  • Denture Retention / methods*
  • Denture, Overlay*
  • Female
  • Humans
  • Jaw, Edentulous / rehabilitation*
  • Magnetics
  • Male
  • Middle Aged
  • Prospective Studies
  • Suture Anchors
  • Treatment Outcome