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Catechin Mouth-washing for Removal of Intraoral Bacteria

This study has been terminated.
(difficult to achieve the sufficient subjects)
Information provided by (Responsible Party):
Masahiro Morikawa, University of Shizuoka Identifier:
First received: September 14, 2006
Last updated: July 14, 2013
Last verified: July 2013
The Purpose of this study is to evaluate the effects of catechin mouth-washing on the removal of intraoral bacteria in the elderly

Condition Intervention
Elderly Dietary Supplement: catechin extracts

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: A Clinical Trial of Tea Catechin Mouth-washing for Removal of Intraoral Bacteria in the Elderly

Resource links provided by NLM:

Further study details as provided by Masahiro Morikawa, University of Shizuoka:

Primary Outcome Measures:
  • Removal of intraoral pathogenic bacteria identified before the study [ Time Frame: After intervention ]

Secondary Outcome Measures:
  • Reduction of intraoral bacteria after the study [ Time Frame: After intervention ]

Enrollment: 36
Study Start Date: October 2006
Study Completion Date: July 2013
Primary Completion Date: July 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: catechin
mask containing catechins
Dietary Supplement: catechin extracts
catechin extracts solution

Detailed Description:
Catechins are the major components of tea flavonoids and recent in vitro experimental studies have revealed that tea catechin extracts induce bactericidal effects. However, a limited number of studies have been conducted on the clinical effects of tea catechin against bacterial infection and also the effects in the elderly is unclear. Based on these backgrounds, we designed a prospective randomized controlled study to evaluate the effects of catechin mouth washing on oral pathogenic bacterial detected in the elderly.

Ages Eligible for Study:   65 Years to 95 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • aged over 65 years
  • detected oral pathogenic bacterium and revalidated during the wash-out period
  • without antibacterial medicine, other mouth-washing remedies during the study
  • Obtained written informed consent before participation

Exclusion Criteria:

  • possessing some infectious diseases in need of therapy
  • possessing tea or catechin allergy
  • diagnosed as inadequate for other reasons to participate the study by principal investigator
  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: NCT00377507

White cross nursing home
Higashi Murayama, Tokyo, Japan, 189-0021
Sponsors and Collaborators
Masahiro Morikawa
Study Chair: Hiroshi Yamada, MD, PhD University of Shizuoka
  More Information

Responsible Party: Masahiro Morikawa, Clinical trials management office, University of Shizuoka Identifier: NCT00377507     History of Changes
Other Study ID Numbers: CT2006004
Study First Received: September 14, 2006
Last Updated: July 14, 2013

Keywords provided by Masahiro Morikawa, University of Shizuoka:
mouth washing
colonized processed this record on September 21, 2017