Patients satisfying inclusion and exclusion criteria will be randomly assigned into two groups by simple randomization method: -

Group A (control group) – Coronally Advanced Flap

Group B (test group) – Coronally Advanced Flap with application of 0.2% hyaluronic acid

All the recruited patients will be asked to sign an informed consent prior to the treatment.

All the patients will be examined at baseline(T0) for probing pocket depth [PPD], clinical attachment level [CAL], recession depth (RD), recession width (RW), keratinized tissue width (KTW) and gingival tissue thickness (GTT).

After initial periodontal examination at baseline, all the participants will undergo initial phase of treatment of thorough scaling and root planning

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The surgical area will be prepared with adequate anesthesia using 2% lignocaine HCL containing 1:1,00,000 epinephrine. After local anesthesia and before the elevation of the flap, both the exposed root surfaces will be gently planned with a sharp Gracey no. 1–2 curettes to reduce root convexity. Immediately after, the root surface will be washed for 60 s with water spray. Intrasulcular incisions will be then made with a blade (no. 15) on the buccal aspect of the involved tooth. This incision will be horizontally extended to the adjacent papillae avoiding the gingival margin of the adjacent teeth. Two oblique releasing incisions will be carried out from the mesial, and distal extremities of the horizontal incision beyond the mucogingival junction. A trapezoidal full-thickness flap will be raised with a periosteal elevator, until the mucogingival junction. Then a partial-thickness dissection will be carried out apically leaving the underlying periosteum in place. In addition, a mesiodistal and apical dissection parallel to the vestibular lining mucosa will be performed with a blade to release residual muscle tension and to facilitate the passive coronal displacement of the flap. The papillae adjacent to the involved tooth will be de-epithelized. The flap then advanced coronally and adapted to cover the cementoenamel junction

In the experimental group, hyaluronan gel (gengigel 0.2%) applied on the root surface using a sterile instrument prior to flap advancement and suturing whereas in the control group the flap will be advanced coronally without application of HA gel. Suturing of oblique releasing incisions will be performed with absorbable 5-0 braided coated Polygalactin 910 (Vicryl) sutures, while the coronal mesial and distal extremities of the flap will be secured by two single sutures placed in the interdental areas.

Immediately following surgery, use of ice packs was recommended for 3 h. All patients were instructed to discontinue tooth brushing, avoid trauma around the surgical site. In the event of pain, the use of ibuprofen + paracetamol (thrice daily) was recommended. A 0.2% chlorhexidine digluconate solution rinse was prescribed 2 times (60 s) daily for the first 10 days. The sutures were removed after 7 days. The patients were instructed to clean the surgical sites with a cotton pellet soaked in a 0.2% chlorhexidine digluconate solution twice daily for 10 days.