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Related Experiment Video

Updated: Jul 19, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Complications associated with fixed partial dentures with a loose retainer.

Donald A Curtis¹, Octavia Plesh, Arun Sharma

¹Department of Preventive and Restorative Dental Sciences, University of California San Francisco, School of Dentistry, USA. Don.Curtis@ucsf.edu

The Journal of Prosthetic Dentistry

|October 21, 2006

Summary

Removing a loose fixed partial denture (FPD) retainer can cause complications. However, intact FPD retrieval and recementation is possible in most cases, minimizing further dental treatment needs.

Related Experiment Videos

Last Updated: Jul 19, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Area of Science:

Dental prosthetics
Fixed partial dentures
Crown removal systems

Background:

A loose retainer on a fixed partial denture (FPD) presents a clinical challenge, with options including sectioning the FPD or attempting intact removal.
Excessive force during removal can lead to irreversible damage to the natural dentition.

Purpose of the Study:

To assess the complications associated with removing definitive cemented FPDs when only one retainer has become loose.
To determine the frequency and types of damage that may occur during this procedure.

Main Methods:

The study involved 22 patients with a definitive cemented FPD with complete cast crown retainers, where one retainer was loose and the other remained cemented.
A crown removal system with two attachment types was used for FPD retainer removal.
Data collected included patient and FPD characteristics, attachment type, removal attempts, and the condition of the FPD and abutment teeth post-removal.

Main Results:

A significant percentage of patients (41%) were unaware of their loose FPD retainer, and most (82%) experienced no discomfort.
Caries were present on 50% of teeth with loose retainers.
Complications during removal included minor porcelain fracture (9%), minor core chipping (14%), minor incisal edge chipping (27%), and major abutment tooth damage (4%).

Conclusions:

Intact retrieval and successful recementation of the fixed partial denture was achieved in 64% of cases.
This suggests that careful removal attempts can preserve the FPD and abutment teeth, avoiding more complex restorative interventions.