Xenogenic Collagen Matrix for the Treatment of Multiple Gingival Recessions

Study Overview
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Brief Summary
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The primary aim of this study is to evaluate whether the use of a xenogenic collagen matrix (XCM) for the treatment of multiple adjacent gingival recessions (MAGRs) with a multiple coronally advanced flap technique (mCAF) achieves better results than the use of an autologous connective tissue graft (CTG) in terms of recession reduction (primary outcome) and other secondary root coverage outcomes (e.g. complete root coverage, mean root coverage). Moreover, this study aims to compare secondary clinical variables (e.g. keratinized tissue width (KTW) changes, probing pocket depth (PPD) changes, volumetric gain (VG), etc.), also with a digital approach, the patient-reported outcome measures (PROMs e.g. pain, swelling, bleeding). The hypothesis of this study is that at 6 months and 1 year follow-up the mCAF with XCM is not inferior to CTG in terms of recessions reduction and secondary clinical variables, and superior regarding to PROMs.

Official Title
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Coronally Advanced Flap With Xenogenic Collagen Matrix or Autogenous Connective Tissue Graft for the Treatment of Multiple Adjacent Gingival Recessions: a Randomized Controlled Trial

Conditions
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Gingival Recession, Generalized

Intervention / Treatment
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* Device: Use of XCM for the treatment of MAGRs with mCAF technique
* Procedure: Treatment of MAGRs with CTG


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: At least 18 years old and able to sign informed consent At least 2 adjacent teeth with RT1 and/or RT2 gingival recessions without interproximal exposure of the CEJ (interdental gingival recession), at least one with a depth of ≥2mm with indication for root coverage treatment A minimum of 4 adjacent teeth (including the ones to be treated) in the region of interest Available to attend study related procedures (including follow-up visits) Exclusion Criteria: Systemic diseases/medications which could influence the outcome of the therapy (e.g., uncontrolled diabetes mellitus); Current smokers (self-reported, any type of smoking), users of chewing tobacco, and drug/alcohol abusers; Pregnant or nursing women; History of previous periodontal surgery (mucogingival or other) on the teeth to be included; Furcation involvement in the teeth to be included; Presence of severe tooth malposition, rotation or clinically significant extrusion in the teeth to be treated; Presence of fixed or removable prosthesis in the area to be treated

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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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Xenogenic collagen matrix (XCM)<br>Multiple coronally advanced flap technique (mCAF) with the use of a XCM | Device: Use of XCM for the treatment of MAGRs with mCAF technique<br>* After local anaesthesia, mCAF technique will be performed. XCM will be adapted on the root surfaces and positioned at the level of the cemento-enamel junction.<br>|
| Active Comparator: Connective tissue graft (CTG)<br>Multiple coronally advanced flap technique (mCAF) with the use of a CTG | Procedure: Treatment of MAGRs with CTG<br>* After local anaesthesia, mCAF technique will be performed. CTG will be adapted on the root surfaces and positioned at the level of the cemento-enamel junction.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean Recession Reduction (RecRed) | Mean changes in mm in recession depth between baseline and 1-year | 6 months; 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Complete Root Coverage (CRC) | Percentage of sites with complete root coverage after 1-year | 6 months; 1 year | 
| Mean Root Coverage (MRC) | Percentage of mean root coverage after 1-year | 6 months; 1 year | 
| Keratinised tissue height (KTH) changes | Linear changes in mm from the gingival margin to the mucogingival junction between baseline and 1-year | 6 months; 1 year | 
| Post-operative morbidity (pain, swelling, discomfort) | Assessment of patient's pain, swelling and discomfort at 14 days after the procedure using visual analogue scale (VAS) ranging from 0 (no pain, swelling or discomfort) to 10 (maximum pain, swelling or discomfort) with a questionnaire | 14 days |