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Effect of Lozenges Containing Probiotic Lactobacilli on Enamel Demineralization Assed by QLF

This study has been completed.
Information provided by (Responsible Party):
Mette Kirstine Keller, University of Copenhagen Identifier:
First received: November 28, 2012
Last updated: December 2, 2014
Last verified: December 2014

Clinical trials in children and adults have suggested that daily consumption of probiotic lactic acid bacteria can reduce caries risk and caries development in primary teeth in preschool and stop root caries in the elderly. However, it is not known whether probiotic bacteria can affect the increased porosity in young permanent teeth in children and adolescents with many cavities.

It can be difficult to measure the increased porosity of the enamel by tooth decay, but this can be done using quantitative laser fluorescence (QLF). The method is based on visible light with a wavelength of 370 nm, addressing enamel. This produces an image consisting of red and green color tones and the dominant color of the enamel is green. Increased porosity of the enamel, resulting in a reduction of the auto-fluorescence and the loss (or gain) of the mineral can be quantified by means of a corresponding software.

The purpose of this study is to investigate the effect of a daily supplement of probiotic lactic acid bacteria on the loss of mineral in enamel assessed with QLF. The null hypothesis is that the mineral content will not differ from baseline in either the test group or the placebo group.

Condition Intervention
Caries Dentalis
Biological: L. retueri
Biological: Placebo

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Effect of Lozenges Containing Probiotic Lactobacilli on Enamel Demineralization Assed by QLF

Resource links provided by NLM:

Further study details as provided by University of Copenhagen:

Primary Outcome Measures:
  • Change in enamel porosity [ Time Frame: Baseine and 12 weeks ]
    Change in enamel porosity assed by QLF

Enrollment: 66
Study Start Date: September 2012
Study Completion Date: March 2014
Primary Completion Date: July 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Probiotic lactobacilli
L. reuteri, two times a day for 6 weeks
Biological: L. retueri
two tablets a day for 6 weeks
Placebo Comparator: Placebo
Placebo tablets, two times a day for 6 weeks
Biological: Placebo


Ages Eligible for Study:   12 Years to 17 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • two sites with white spot lesions in anterior teeth

Exclusion Criteria:

  • antibiotic treatment within 2 months
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01738958

Ishøj kommunale tandpleje
Ishøj, Denmark, 2635
Sponsors and Collaborators
University of Copenhagen
  More Information

Responsible Party: Mette Kirstine Keller, Assistant Professor, University of Copenhagen Identifier: NCT01738958     History of Changes
Other Study ID Numbers: H-4-2012-096
Study First Received: November 28, 2012
Last Updated: December 2, 2014

Keywords provided by University of Copenhagen:
Probiotic bacteria
Caries dentalis
QLF processed this record on May 22, 2017