Effectiveness of adjunctive hyaluronic acid application in coronally advanced flap in Miller class I single gingival recession sites: a randomized controlled clinical trial

ObjectivesThe aim of this randomized controlled clinical trial was to evaluate the possible advantages of adjunctive hyaluronic acid (HA) application in thecoronally advanced flap (CAF) procedure in single Miller class I/recession type 1 (RT1) gingival recession treatment.Material and methodsThirty patients with one recession were enrolled; 15 were randomly assigned CAF + HA and 15 to CAF alone. The recession reduction (RecRed), clinical attachment level gain (CAL-gain), changes in probing pocket depth (PPD) and in the width of keratinized tissue (KT), complete root coverage (CRC), and mean root coverage (MRC) were calculated after 18months. Post-operative morbidity (pain intensity, discomfort, and swelling) was recorded 7days after treatment using visual analogue scale (VAS).ResultsAfter 18months, RecRed was statistically significantly higher in the test group (2.7mm [1.0]) than in the control group (1.9mm [1.0]; p=0.007). PPD were found to be slightly but statistically significantly increased in both groups. No statistically significant difference was found for KT gain between treatments. CRC was 80% for test and 33.3% for control sites (p<0.05). A MRC of 93.813.0% for test and 73.120.8% for control sites was calculated (p<0.05). The test group reported lower swelling and discomfort values 7-days post-surgery (p<0.05). Statistically significant difference was not found for pain intensity.Conclusions The adjunctive use of HA was effective in obtaining CRC for single Miller class I/RT1 gingival recession sites.Clinical relevance Adjunctive application of HA in the coronally advanced flap proceduremay improve the reduction of the recessions and increase the probability of CRC in Miller class I recessions.