Oral Health in Bariatric Patients

January 24, 2026 updated by: Philipp Kanzow, Prof. Dr. med. dent., Dr. rer. medic., University of Göttingen
As few is known about the oral health of bariatric patients, this study aimed to analyze the prevalence and severity of erosive tooth wear, dental caries and periodontal diseases of obese patients who underwent bariatric surgery in comparison to obese patients without bariatric procedures.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Detailed Description

The prevalence of overweight and obesity is increasing since the 1980s. Being associated with several risk factors such as hypertension, hyperinsulinemia and hyperlipidemia, obesity presents an immediate and long-term health risk for diabetes mellitus, heart diseases, osteoarthritis and certain forms of cancer. For the control of obesity several therapy options have been developed: Beside conservative treatments including change of diet and lifestyle, bariatric surgery is considered as a promising option for patients with severe obesity (BMI ≥ 40 kg/m2). Allowing impressive weight loss from 40 to 80% and effective reduction of comorbidities, bariatric surgery shows some negative/adverse effects as well, like kidney problems, hyperparathyroidism, anemia and metabolic bone diseases. For oral health, two facts are particularly important to consider: Firstly, chronic regurgitation reaching the oral cavity is an important risk factor for erosive tooth wear which initially appear as smooth silky-shining glazed surfaces. Further progress is often associated with hypersensitivities and aesthetic deficits. Over time, often substantial loss can been observed, provoking hypersensitivities and aesthetic deficits. Secondly, depending on the type of bariatric surgery, pronounced postoperative metabolic and nutritional changes can be observed which also might influence oral health. Aim of this study is to analyze the prevalence and severity of erosive tooth wear, dental caries and periodontal diseases of obese patients who underwent bariatric surgery in comparison to obese patients without bariatric procedures.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
61

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Germany
      • Göttingen, Germany, 37075
        • Dept. of Prev. Dentistry, Periodontology and Cariology, University Medical Center Göttingen

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

The study enrolls obese adults (Age over 18 years) with an BMI (body mass index) of at least 25 kg/m2 without or after bariatric surgery

Description

Inclusion Criteria:

  • Age ≥ 18 years
  • BMI ≥ 25 kg/m2 without or after bariatric surgery

Exclusion Criteria:

  • refusal for participation
  • age <18 years
  • BMI <25 kg/m2

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
obese patients after bariatric surgery
obese adults (≥ 18 years) who underwent bariatric surgery
obese adultes without bariatric surgery
obese adults (≥ 18 years) who did not underwent bariatric surgery at the time of the examination

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Oral health of obese adults without bariatric surgery - attachment loss
Time Frame: 10-15 Minutes
probing depths (mm) + recessions (mm)
10-15 Minutes
Oral health of obese adults without bariatric surgery - BOP
Time Frame: 2 Minutes
BOP (Bleeding on probing, %) as indicator of inflammation
2 Minutes
Oral health of obese adults without bariatric surgery - dental caries
Time Frame: 2-5 Minutes
ICDAS (International Caries Detection and Assessment System II, 0-6), presence of restaurations/ crowns (yes/no): calculation of DMFT
2-5 Minutes
Oral health of obese adults without bariatric surgery - erosive tooth wear
Time Frame: 1-2 Minutes
BEWE (Basic erosive wear examination, 0-3)
1-2 Minutes

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Oral health of obese adults after bariatric surgery - attachment loss
Time Frame: 10-15 Min
probing depths (mm) + recessions (mm)
10-15 Min
Oral health of obese adults after bariatric surgery - BOP
Time Frame: 2 Minutes
BOP (Bleeding on probing, %) as indicator of inflammation
2 Minutes
Oral health of obese adults after bariatric surgery - dental caries
Time Frame: 2-5 Minutes
ICDAS (International Caries Detection and Assessment System II, 0-6), presence of restaurations/ crowns (yes/no): calculation of DMFT
2-5 Minutes
Oral health of obese adults after bariatric surgery - erosive tooth wear
Time Frame: 1-2 Minutes
BEWE (Basic erosive wear examination, 0-3)
1-2 Minutes

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Göttingen

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Annette Wiegand, Prof. Dr. med. dent., Dept. of Prev. Dentistry, Periodontology and Cariology

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 15, 2018

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
February 12, 2020

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
February 12, 2020

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
March 21, 2018

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 3, 2018

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 4, 2018

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 27, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 24, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 28/3/17

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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