Locator Versus Bar Attachment Effect on the Retention and Stability of Implant-Retained Maxillary Overdenture: An In Vitro Study

J Prosthodont. 2019 Feb;28(2):e627-e636. doi: 10.1111/jopr.12608. Epub 2017 Apr 7.


Purpose: To compare retention and stability of Locator and bar attachments for implant-retained maxillary overdentures.

Materials and methods: Four implants were inserted into a maxillary acrylic resin model in canines and second premolar areas. Experimental overdentures were connected to the implants with bar (group I) or Locator (group II) attachments. Locators were divided into 3 subgroups according the degree of retention of the patrix nylon insert: Locator blue (group IIa), Locator pink (group IIb), and Locator transparent (group IIc). Retention (vertical dislodging) and stability (lateral, anterior, posterior dislodging) forces (N) were measured at the start of the experiment (initial retention) and after 540 cycles of denture insertion and removal (final retention).

Results: The highest initial and final stability was recorded with group IIc, followed by group IIb and group IIa, and the lowest retention and stability was noted with group I. For all groups, the highest final retention and stability forces were noted with vertical dislodging, followed by posterior dislodging, anterior dislodging, and lateral dislodging. The highest loss of retention and stability was recorded with group I, followed by group IIc, group IIb, and group IIa.

Conclusion: Locator attachments are recommended to retain maxillary overdentures over Dolder bar attachments, as Locator attachments were associated with high retention and stability after wear simulation with minimal retention loss.

Keywords: Implant; bar; locator; maxillary; overdenture; retention; stability.

Publication types

  • Comparative Study

MeSH terms

  • Dental Abutments
  • Dental Implant-Abutment Design / methods
  • Dental Prosthesis, Implant-Supported / instrumentation
  • Dental Prosthesis, Implant-Supported / methods*
  • Dental Stress Analysis
  • Denture Retention / instrumentation
  • Denture Retention / methods*
  • Denture, Overlay*
  • Humans
  • In Vitro Techniques
  • Maxilla