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Completed

NCT Number: NCT07536776

Radiographic and Retention Evaluation Over Seven Years for Four Implant Retained Overdenture

ABSTRACT Statement of the problem: Insufficient long-term retrospective data is evaluating marginal bone loss and retention of four-implant Locator-retained mandibular overdentures.

Purpose: To assess marginal bone loss and retention of four-implant Locator-retained mandibular overdentures over seven years at the time of overdenture insertion (T0), 1 year (T1), and 7 years (T7) after insertion.

Material and methods: This retrospective study included 27 completely edentulous patients with maxillary single denture, and four parallel implants were placed interforaminal, and they already have a mandibular four-implant retained overdenture with LOCATOR attachments.

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Key information

Conditions

Marginal Bone Loss Around Implants

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Basma

Al Mansurah, Egypt

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Completely edentulous patients
  • Presence of four mandibular implants supporting a Locator-retained overdenture with an opposing single maxillary denture.
  • Availability of baseline and follow-up radiographs
  • Minimum follow-up period of 7 years after prosthesis delivery Exclusion Criteria
  • Incomplete clinical or radiographic records 2. History of implant failure before prosthetic loading 3. Patients with peri-implantitis at baseline 4. Systemic conditions known to affect bone metabolism

Treatment and study plan

implant retained overdenture

Other

4 implants retained prosthesis by locators

Primary outcomes

  1. Marginal Bone Loss

    Time frame: From the time of implant loading (Baseline) up to 7 years.

Secondary outcomes

  1. Prosthetic Retention

    Time frame: 7 years.

Sponsors and collaborators

Lead sponsor

Mansoura University

Other

Registry information

Official study title

Marginal Bone Loss and Retention of Four-Implant Locator-Retained Mandibular Overdentures: 7 Years Follow up

Important dates

Study start
2018
Primary completion
2026
Study completion
2026
First posted
Apr 17, 2026
Registry last updated
Apr 17, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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