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

Dental Polymer Based Filling Material Clinical Trial

Official title:

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

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02575118
• Other study ID #: REK 2014/1529
• Status: Completed
• Start date: October 2015
• Est. completion date: January 2018

Study information

• Verified date: May 2018
• Source: NORCE Norwegian Research Centre AS
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

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.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 20
• Est. completion date: January 2018
• Est. primary completion date: December 2017
• Accepts healthy volunteers: No
• Gender: All
• Age group: 16 Years to 40 Years

Eligibility

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

Related Conditions & MeSH terms

• Dental Polymer Based Filling Material

Intervention

Device:
• Restoration of dental caries with dental composite

Locations

Country	Name	City	State
Norway	Public dental clinic, Bergen Downtown District AND Dental Clinic of the Student Welfare Organization in Bergen	Bergen

Sponsors (2)

Lead Sponsor	Collaborator
NORCE Norwegian Research Centre AS	Hordaland County Council

Country where clinical trial is conducted

Norway, 

References & Publications (1)

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. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Concentration of Bisphenol A in Saliva	Estimated bisphenol A (BPA) concentration (ng ml-1) in saliva	1 week
Primary	Concentration of Bisphenol A in Urine	Estimated bisphenol A (BPA) concentration (ng ml-1) in urine	1 week