Ball versus locator® attachments : a retrospective study on prosthetic maintenance and effect on oral-health-related quality of life

  • Locator® and ball attachments are well-established systems to attach overdentures to two inter-foraminal implants. This study aimed to evaluate differences between the two systems regarding prosthetic maintenance and patients' oral-health-related quality of life (OHRQoL). Dental records of patients with a mandibular implant-retained overdenture were retrospectively analyzed. Prosthetic maintenance measures involving the denture suprastructure and attachment matrix and patrix were analyzed. Furthermore, the Oral Health Impact Profile-G14 (OHIP-G14) was used to evaluate OHRQoL. Results were analyzed by means of Kaplan–Meier analysis and Student's t- and log-rank tests. The records of 122 patients were evaluated. Kaplan–Meier survival analysis revealed a significant difference between ball attachments (Group B; n patients = 47) and Locator® attachments (Group L; n patients = 75) regarding the occurrence of denture fractures (p < 0.001) and events affecting the matrix (p = 0.028) and patrix (p = 0.030). Group L had a significantly lower total OHIP-G14 score than Group B (p = 0.002). The most common maintenance events were matrix-related and denture relining for both attachment systems. Group B required more maintenance measures than Group L. Moreover, patients in Group L had better OHRQoL than patients in Group B.
Author:Silvia Brandt, Hans-Christoph Lauer, Michael Fehrenz, Jan-Frederik GüthORCiDGND, Georgios Romanos, Anna Winter
Parent Title (English):Materials
Place of publication:Basel
Document Type:Article
Date of Publication (online):2021/02/23
Date of first Publication:2021/02/23
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2021/05/05
Tag:OHIP-G14; OHRQoL; attachment; ball; locator; overdenture
Issue:4, art. 1051
Page Number:10
First Page:1
Last Page:10
Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Licence (German):License LogoCreative Commons - Namensnennung 4.0