Five years follow-up of mandibular 2-implant overdentures on locator or ball abutments: Implant results, patient-related outcome, and prosthetic aftercare

Carine Matthys, Stijn Vervaeke, Jos Besseler, Ron Doornewaard, Melissa Dierens, Hugo De Bruyn

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Background: It is uncertain, which is the optimal attachment for a mandibular 2-implant overdenture (2IOD). Purpose: To assess 5 years clinical implant outcome, prosthetic maintenance, cost, and PROMs of two cohorts receiving 2IOD on ball or stud abutments in a comparative study. Materials and Methods: Ninety edentulous individuals were treated with balls (n = 34) or locator (n = 56). Implant survival, bone-to-implant level, prosthetic outcome, technical maintenance, and OHIP-14 were assessed. Statistics to compare between baseline and 1/5 years and between groups were t-test or Mann-Whitney (P <.05); chi-square was adopted to analyze plaque and technical maintenance or interventions between groups. Results: Five years implant survival was 98.7%, irrespective of attachment. Overall mean bone loss was 1.1 mm, probing pocket depth 1.92 mm, bleeding score 0.60, plaque score 1. Plaque accumulated more on locators (P =.023). OHIP-14 declined from 18.1 to 2.7 irrespective of attachment. Retention for balls was better (P <.005), locators required more maintenance (P <.001), caused by retention-adjustment (P <.001) or ulcers/pain (P =.014). Five years maintenance-cost was 11% of initial cost, irrespective of attachment. Conclusions: Balls and locators yield stable 5-years implant outcome and improved Oral Health Related Quality of Life (OHRQoL). Locators required more maintenance and resulted in a lower retention. Maintenance costs are minimal but may affect OHRQoL at least for stud abutments.
Original languageEnglish
Pages (from-to)835-844
JournalClinical Implant Dentistry and related research
Volume21
Issue number5
DOIs
Publication statusPublished - 1 Oct 2019
Externally publishedYes

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