Working… Menu

Acid Production in Dental Plaque After Exposure to Probiotic Bacteria

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01700712
Recruitment Status : Completed
First Posted : October 4, 2012
Last Update Posted : October 4, 2012
BioGaia AB
Calcin foundation, Denmark
Information provided by (Responsible Party):
Mette Kirstine Keller, University of Copenhagen

Brief Summary:

The increasing interest in probiotic lactobacilli in health maintenance has raised the question of potential risks. One possible side effect could be an increased acidogenicity in dental plaque. The aim of this study was to investigate the effect of probiotic lactobacilli on plaque lactic acid (LA) production in vitro and in vivo.

Methods. subjects (n=18) were given lozenges with probiotic lactobacilli (L. reuteri DSM 17938 and ATCC PTA 5289) or placebo for two weeks in a double-blinded, randomized cross-over trial. The concentration of LA in supragingival plaque samples was determined at baseline and after 2 weeks. Salivary counts of mutans streptococci (MS) and lactobacilli were estimated with chair-side methods.

Condition or disease Intervention/treatment Phase
Caries Dietary Supplement: Probiotic Lactobacilli reuteri Dietary Supplement: Placebo Not Applicable

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 18 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Study Start Date : December 2010
Actual Primary Completion Date : October 2011
Actual Study Completion Date : October 2011

Arm Intervention/treatment
Active Comparator: L. reuteri (DSM 17938 and ATCC PTA 5289; 1x108 CFU
2 tablets a day for 2 weeks
Dietary Supplement: Probiotic Lactobacilli reuteri
Placebo Comparator: Sugar pill
2 tablets a day for 2 weeks
Dietary Supplement: Placebo

Primary Outcome Measures :
  1. Acid production in plaque after exposure to probiotic bacteria [ Time Frame: 2 weeks ]

Secondary Outcome Measures :
  1. Acid producton in plaque after in vitro exposure to probiotic bacteria [ Time Frame: 1 hour ]

Information from the National Library of Medicine

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, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • moderate to high counts of salivary mutans streptococci (>104 CFU) as estimated with the Dentocult SM chair-side test,
  • no visible open caries lesions or periodontal disease,

Exclusion Criteria:

  • smokers,
  • ingestion of probiotic bacteria within the last two months,
  • ingestion of antibiotics within the last two months

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01700712

Layout table for location information
University of Copenhagen
Copenhagen, Denmark, 2100
Sponsors and Collaborators
University of Copenhagen
BioGaia AB
Calcin foundation, Denmark
Layout table for investigator information
Principal Investigator: Mette K Keller, PhD University of Copenhagen
Publications automatically indexed to this study by Identifier (NCT Number):
Layout table for additonal information
Responsible Party: Mette Kirstine Keller, Reasearch Associate, University of Copenhagen Identifier: NCT01700712    
Other Study ID Numbers: H-2-2010-112
First Posted: October 4, 2012    Key Record Dates
Last Update Posted: October 4, 2012
Last Verified: October 2012
Keywords provided by Mette Kirstine Keller, University of Copenhagen:
Caries, probiotic bacteria