Bisphenol A in Saliva and Urine Related to Placement of Dental Composites

Concentration of Bisphenol A in Saliva and Urine Before and After Treatment With Polymer-based Dental Filling Materials

It has been reported that therapy with polymer-based dental filling materials was associated with higher concentrations of bisphenol A in saliva and urine directly after the treatment. The objective of the present project is to gain knowledge about the concentration of bisphenol A in saliva and urine before and after treatment with polymer-based dental filling materials, using sensitive analytical methods.

Study Overview

• Status: Completed
• Conditions: Dental Polymer Based Filling Material
• Intervention / Treatment: Device: Restoration of dental caries with dental composite

Detailed Description

Bisphenol A (BPA) is a xenoestrogen which has been shown to cause abnormalities in sexual development and may lead to reproductive damage in animals. In epidemiological studies BPA has been associated with various health effects. The majority of dental plastic filling materials contain polymers synthesized from BPA. Whether BPA is released in vivo from polymer-based fillings and - if so, in what doses - is not sufficiently examined. Patients scheduled for regular dental examination at the public dental clinic, Bergen Downtown District, who needs therapy with dental polymer-based filling materials and is suitable for study (inclusion / exclusion criteria) will be informed about the project. If the patient wants to participate in the study, he/she will be given written information about the study and a consent form. It is emphasized that participation in the study is voluntary and the patient will have the opportunity to read the information at home, before the next appointment at the clinic. The clinical treatment of the carious lesion(s) will be performed according to standardized procedures and materials used at the clinic. After curing, the filling will be polished according to the standard procedures. The curing lamp will be controlled and documented weekly during the project period. All treatment sessions will be scheduled in the morning before 9 am. Questions regarding food intake and dental hygiene habits will be included in questionnaires answered during the study. Samples of saliva and urine will be collected immediately before filling placement and 1 hour, 24 hours and 1 week after treatment. A saliva sample will also be collected immediately after treatment. No food or drink intake is allowed after midnight before sample collection. Only tapped water is permitted. The sampling procedure will be controlled in advance, so that the risk of contamination of samples is minimized. After collection samples will be refrigerated and stored frozen at -80 °C until analysis. Bisphenol A in saliva and urine will be determined by liquid chromatography and mass spectrometry (LC-MS). The detection limit of the method is estimated at 0.1 ng BPA/ml. The study is approved by the Regional Committee for Medical and Health Research (reference number 2014/1529). Patients who participate in the project will have to collect saliva samples five times and urine samples four times, which involves extra visits to the clinic. The biomedical outcomes (concentration of bisphenol A in saliva and urine) will be assessed in a pre-defined group of individuals. The participants may be enrolled in the study if they fulfil the criteria (including need of a dental filling). The participants do not receive the intervention (placement of a dental filling) because they are enrolled in the study. Subjects in the study will receive the therapeutic intervention, but the investigator does not assign the intervention to the subjects of the study. Thus, the study may be described as an observational study.

• Study Type: Observational
• Enrollment (Actual): 20

Contacts and Locations

Study Locations

• Norway
  • Bergen, Norway
    • Public dental clinic, Bergen Downtown District AND Dental Clinic of the Student Welfare Organization in Bergen

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 16 years to 40 years (Child, Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Patients scheduled for regular dental examination at the public dental clinic (Bergen Downtown District) and the Dental Clinic of the Student Welfare Organization in Bergen, who are in need for treatment with dental polymer-based filling materials, are suitable for study (inclusion / exclusion criteria) and have given their written informed consent.

Description

Inclusion Criteria:

• Need for filling therapy that involves at least two surfaces with a polymer-based filling material
• Healthy patient without any chronic diseases
• Age 16 - 40 years
• Informed consent given

Exclusion Criteria:

• Drug abuse
• Smoking
• Use of snuff
• Use of dental splint
• Work at a dental clinic

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Concentration of Bisphenol A in Saliva	Estimated bisphenol A (BPA) concentration (ng ml-1) in saliva	1 week
Concentration of Bisphenol A in Urine	Estimated bisphenol A (BPA) concentration (ng ml-1) in urine	1 week

Collaborators and Investigators

• Sponsor: NORCE Norwegian Research Centre AS
• Collaborators: Hordaland County Council
• Investigators: Study Chair: Lars Björkman, DDS, PhD, NORCE Norwegian Research Centre AS

Publications and helpful links

General Publications

• Berge TLL, Lygre GB, Lie SA, Lindh CH, Bjorkman L. Bisphenol A in human saliva and urine before and after treatment with dental polymer-based restorative materials. Eur J Oral Sci. 2019 Oct;127(5):435-444. doi: 10.1111/eos.12647. Epub 2019 Aug 8.

Study record dates

Study Major Dates

• Study Start (Actual): October 1, 2015
• Primary Completion (Actual): December 1, 2017
• Study Completion (Actual): January 1, 2018

Study Registration Dates

• First Submitted: October 5, 2015
• First Submitted That Met QC Criteria: October 12, 2015
• First Posted (Estimate): October 14, 2015

Study Record Updates

• Last Update Posted (Actual): January 18, 2023
• Last Update Submitted That Met QC Criteria: November 25, 2022
• Last Verified: May 1, 2018

More Information

Terms related to this study

• Other Study ID Numbers: REK 2014/1529