Gum disease treatment gets a closer look: do antibiotics really help?
NCT ID NCT06131021
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested whether taking antibiotics along with standard deep-cleaning treatment (scaling and root planing) improves gum health in adults with periodontitis. 236 participants from dental practices across the U.S. were randomly assigned to receive either antibiotics (amoxicillin and metronidazole) or a placebo. The goal was to see if the antibiotics led to shallower gum pockets and better overall outcomes.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 3
Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.
- Participants
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236 people
The number who actually took part.
- Started
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Apr 2024
- Finished
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Apr 2026
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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35 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * The study will recruit patient participants presenting for periodontal treatment within the National Dental PBRN practices participating in this study. To be eligible to participate in this study, a potential patient participant must meet all the following criteria: * Adult who is at least 35 years old. * Presence of ≥ 15 permanent teeth excluding 3rd molars. * In good general health as evidenced by medical history (ASA Class I or II) per the practitioner. * Planned to receive periodontal care for Generalized Periodontitis and a minimum of two quadrants of SRP (CDT code 4341) in practices participating in the National Dental PBRN. * Willing to comply with all study visits and be available for the duration of the study (12-15 months) * Willing to provide contact information for self, including a cellular phone number for study text, and one to two emergency contacts to be reached for the follow-up visits and any other study-related matters for the duration of the study. Exclusion Criteria: * Known drug allergy to any antibiotics or anesthetics. * Use of systemic antibiotics taken within the previous 3 months prior to enrollment. * Medical condition which requires antibiotic prophylaxis prior to dental treatments/visits. * Current use of medications that, in the opinion of the practitioner, may cause adverse effects with AMXM (such as disulfiram, warfarin, and oral contraceptives). * History of any periodontal therapy (including SRP D4341, D4342) within the last 6 months prior to enrollment. * Is currently pregnant or lactating per patient participant self-report. * Is considered immunocompromised, in the opinion of the practitioner (including diseases and conditions such as HIV/AIDS, immunosuppressive drug therapy and/or radiation), or has chronic mucosal lesions (e.g. pemphigus vulgaris) affecting the gingiva. * Has Diabetes mellitus with an HbA1c score of \>/= 10% within the past 3 months as per patient participant self-report.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of Alabame
Birmingham, Alabama, 35233, United States
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Other studies related to the condition(s) this trial covers.
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