Health Effects From Removal of Amalgam Restorations in Patients With Symptoms Allegedly Related to Dental Amalgam

August 27, 2012 updated by: Lars Bjorkman, University of Bergen

Health Effects From Removal of Amalgam Restorations in Patients With Symptoms Allegedly Related to Dental Amalgam - A Study of Patients Examined at the Dental Biomaterials Adverse Reaction Unit in 1993 to 1999

The aim of the project is to study changes in symptom load after removal of all dental amalgam restorations in patients with symptoms allegedly related to amalgam.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Patients referred from dentists and physicians in the period 1993 to 1999 to the Dental Biomaterials Adverse Reaction Unit, Department of Health, UNIFOB AS, for symptoms related to amalgam restorations are randomized into treatment group (n=20) or reference group (n=20). All patients in the treatment group are followed 3, 12, 36 and 60 months after completion of amalgam removal with questionnaires on health outcomes, Minnesota Multiphasic Personality Inventory-2 (MMPI-2) and laboratory tests.

Study Type

Interventional

Enrollment (Actual)

50

Phase

  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Norway
      • Bergen, Norway, NO-5009
        • UNIFOB AS, Dental Biomaterials Adverse Reaction Unit

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

25 years to 55 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Referred for examination of general health complaints related to amalgam
  • Health complaints from at least three different organ systems
  • Dental amalgam restorations present
  • Data available on concentration of mercury in blood and urine at the initial examination
  • Patient agreed to be contacted after the examination

Exclusion Criteria:

  • Serious disease (incl. severe allergy to foodstuff and severe rheumatoid arthritis)
  • Mental instability or psychiatric disease
  • Cases with complicated dental rehabilitation (incl. bridge prostheses)
  • Allergy to dental replacement materials
  • Severe periodontitis
  • High caries activity

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Factorial Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Treatment group
Procedure: Removal of dental amalgam restorations
Removal of dental amalgam restorations by patient's own dentist. Fillings will be replaced with e.g. resin based filling material, metalloceramic restorations, and ceramic materials. Rubber dam will be used during removal of amalgam restorations.
No Intervention: Reference group

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Changes of subjective health complaints
Time Frame: Five years
Five years
Changes over time of the MMPI-profile
Time Frame: Five years
Five years
Quality of life improvement
Time Frame: Five years
Five years

Secondary Outcome Measures

Outcome Measure
Time Frame
Reduction of mercury in blood serum
Time Frame: One year
One year

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Bergen

Collaborators

NORCE Norwegian Research Centre AS

Investigators

  • Principal Investigator: Lars Björkman, DDS, PhD, University of Bergen

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2002

Primary Completion (Actual)

March 1, 2010

Study Completion (Actual)

March 1, 2010

Study Registration Dates

First Submitted

June 29, 2006

First Submitted That Met QC Criteria

June 29, 2006

First Posted (Estimate)

July 4, 2006

Study Record Updates

Last Update Posted (Estimate)

August 28, 2012

Last Update Submitted That Met QC Criteria

August 27, 2012

Last Verified

August 1, 2012

More Information

Terms related to this study

Other Study ID Numbers

  • REK III 24.01

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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