Evaluation of the Treatment of Multiple Gingival Recession Using Modified Coronally Advanced Tunnel With Subepithelial Connective Tissue Graft Depending on the Positioning of the Graft

Mean root coverage (MRC) was calculated as the percent change in gingival recession height from baseline to 6 months using the formula: (GR0 - GR6) / GR0 × 100%.

• GR-gingival recession height: distance between the cementoenamel junction (CEJ) and the gingival margin at the mid-buccal side
• GR0- before surgery
• GR6- 6 months after surgery

The analyzed metrics were calculated as follows:

GR change= GR0-GR6 (after 6 months); ) [millimetre] higher scores mean better outcome GT change = GT6-GT0 (after 6 months); [millimetre] higher scores mean better outcome KTW change = KTW6-KTW0 (after 6 months); [millimetre] higher scores mean better outcome

• GR-gingival recession height: distance between the cementoenamel junction (CEJ) and the gingival margin at the mid-buccal side
• GT- gingival thickness
• KTW- distance between the gingival margin and the muco-gingival junction (MGJ)
• 0- before surgery
• 6- 6 months after surgery

RES:The following variables were assessed:

• GM - assessment rule: 0 points- root coverage failure, 3 points- partial root coverage, 6 points- complete root coverage;
• marginal tissue contour (MTC) - assessment rule: 0 points - irregular gingival margin, not in line with the CEJ, 1 point- scalloped gingival contour, in line with the CEJ;
• soft tissue texture (STT) - assessment rule: 0 points - scar formation, 1 point- absence of scars;
• MGJ - assessment rule: 0 points - MGJ not aligned with the MGJ of adjacent teeth, 1 point- MGJ aligned with the MGJ of adjacent teeth;
• gingival color (GC) - assessment rule: 0 points- color does not match adjacent teeth, 1 point- color matches adjacent teeth The maximum score for RES was 10, the minimum 0. Higher scores mean better outcome.