Activated MMP-8 as Diagnostic Test for Periodontitis

Study Overview
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Brief Summary
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Background: Untreated periodontal disease may influence general health. However, how may a physician who is not trained in periodontal probing detect untreated periodontitis? Activated matrix metalloproteinase-8 (aMMP-8) in saliva correlates with periodontal probing parameters. Thus, sensitivity and specificity of a chair-side test for activated matrix metalloproteinase-8 to detect periodontitis was evaluated. Methods: Thirty cases (untreated chronic periodontitis; 15 generalized moderate and 15 generalized severe) and 30 controls (probing pocket depths ≤ 3 mm, vertical probing attachment level ≤ 2 mm at < 30% of sites) were examined periodontally. Further, the activated matrix metalloproteinase-8 test was performed. The test kit becomes positive with ≥ 25 ng/ml activated matrix metalloproteinase-8 in the sample.

Detailed Description
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.The hypotheses behind this study were: - The aMMP-8 test discriminates between individuals with and without untreated generalized chronic periodontitis Thus, sensitivity and specificity of a chair-side test for activated matrix metalloproteinase-8 to distinguish between individuals with and without untreated chronic periodontitis as well as between patients with generalized moderate and generalized severe ChP was evaluated. Patients A commercially available chair side test to detect increased levels of activated matrix metalloproteinase-8 was used at Dr. Matthias Mayer's dental office (Arndtstr. 14, 60325 Frankfurt am Main) in periodontally healthy individuals and patients with untreated generalized moderate chronic periodontitis (mChP) and generalized severe chronic Periodontitis (sChP). The companies had provided 70 tests for use. During use the idea arose to retrospectively correlate test results and clinical diagnoses. Thus, a study protocol was submitted to the ethics committee of the Medical Faculty of the Johann Wolfgang Goethe-University Frankfurt/Main. All patients that were examined prior to the vote of the ethics committee were evaluated retrospectively. All following patients were recruited prospectively. All patients were asked about current smoking (yes/no) and education level (basic school, high school, university). The study complied with the rules of the Declaration of Helsinki and was approved by the Institutional Review Board for Human Studies of the Medical Faculty of the Goethe-University Frankfurt/Main (Application# 144/13). Chair side test For all periodontitis patients the activated matrix metalloproteinase-8 test was performed at least 24 hours after clinical examination. For periodontally healthy controls the test was done within a week after clinical examination. First of all patients rinsed with tap water for 30 seconds. Then they spat out the water and waited for 1 min. Now patients rinsed with 5ml of purified water for 30 seconds and spat this sample back into the test cup. Approximately 2 ml of the sampled saliva was now taken up with a syringe. After a filter was put onto the syringe 3 drops of the saliva were pressed through the filter into the ELISA kit. After 5 to 10 min the result was read from the test kit. If both the control and test stripes were visible the respective test was positive (i.e. ≥ 25 ng activated matrix metalloproteinase-8 per ml). All test results were photographed with 2fold magnification. Statistical analysis The patient was looked upon as statistical unit. The sensitivity and specificity of the aMMP-8 test was defined as the main outcome variables. All other parameters were control variables. For all individuals, cigarette pack years were calculated. Group frequencies were expressed for sex, current smoking, education, and activated matrix metalloproteinase-8 (positive/negative). Group means and standard deviations were calculated for age and bleeding on probing. Further, for each individual the following variables were calculated to describe the periodontal status. Comparisons between groups for dichotomous parameters were made by χ² or Fisher's exact test and for all other parameters by Kruskal-Wallis and Mann-Whitney-U test. Using backward stepwise logistic regression analysis, factors should be identified that were associated with positive activated matrix metalloproteinase-8 tests.

Official Title
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Activated Matrix Metalloproteinase 8 (aMMP-8) in Saliva as Diagnostic Test for Periodontal Disease? A Case-control Study

Conditions
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Generalized Chronic Periodontitis

Intervention / Treatment
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* Other: no intervention provided


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: At least18 years of age Clinical diagnosis of generalized moderate or generalized severe ChP At least 5 teeth present per quadrant After application to the ethics committee: written informed consent Exclusion Criteria: Requirement of systemic antibiotics for measures that may cause transitory bacteraemia (e.g. pocket probing) Nonsurgical or surgical periodontal treatment within the last 12 months prior to PerioMarker® test Systemic or topical subgingival antibiotics within the last 6 months prior to PerioMarker® test Anti-inflammatory medication (e.g. non-steroidal anti-inflammatory drugs) during the last 3 months prior to PerioMarker® test

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| gen. mod. to sev. chronic periodontitis<br>Sites with probing pocket depths (PPD) ≥ 3.5 mm Attachment loss (PAL-V) ≥ 3 mm > 30% of sites no Intervention provided | |
| periodontally healthy<br>PPD ≤ 3 mm PAL-V ≤ 2 mm at < 30% of sites BOP < 20% No radiographically detectable bone loss: distance cemento-enamel junction to provided no Intervention but aMMP-8 test | Other: no intervention provided<br>* No Intervention was rendered but the aMMP-8 test was made<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of True Positive/Negative aMMP-8 Tests of All Periodontitis Patients (Sensitivity/Specificity) | First off all patients rinsed with tap water for 30 seconds. Then they spat out the water and waited for 1 min. Now patients rinsed with 5ml of purified water for 30 seconds and spat this sample back into the test cup. Approximately 2 ml of the sampled saliva was now sampled with a syringe. After a filter was put onto the syringe 3 drops of the saliva were pressed through the filter into the ELISA kit. After 5 to 10 min the result was read from the test kit [21]. If both the control and test stripes were visible the respective test was positive (i.e. ≥ 25 ng aMMP 8 per ml). The clinical examiner (SIB) judged the results by simple visual inspection. Already a faint test stripe was judged as positive test. All test results were photographed with 2fold magnification. All images of the test were then evaluated by a second examiner (PE) who was blinded for the clinical diagnoses. | 5 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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activated matrix metalloproteinase 8, untreated moderate/severe chronic periodontitis, saliva, sensitivity/specificity