상피하 결합 조직 이식편을 이용한 수정된 관상 전진 터널을 이용한 다발성 치은 퇴축의 이식 위치에 따른 치료 평가

Procedure: A modified microsurgical tunnel technique. Initial sulcular incisions with a microsurgical blade are followed by a full-thickness buccal flap preparations till muco-gingival junction using the tunneling knives. Subsequently, the split-thickness preparation is extended into the mucosal tissue to gain sufficient flap mobility. The papillary regions are detached in their buccal aspects with the periosteum. The graft is inserted the /inner outer side into the tunnel and stabilized with absorbable suspensory sutures. The buccal flap is advanced coronally and stabilized with non-absorbable suspensory sutures.

21 participants were enrolled into the study, as it was designed to be a split mouth study

Procedure: A modified microsurgical tunnel technique. Initial sulcular incisions with a microsurgical blade are followed by a full-thickness buccal flap preparations till muco-gingival junction using the tunneling knives. Subsequently, the split-thickness preparation is extended into the mucosal tissue to gain sufficient flap mobility. The papillary regions are detached in their buccal aspects with the periosteum. The graft is inserted the /inner outer side into the tunnel and stabilized with absorbable suspensory sutures. The buccal flap is advanced coronally and stabilized with non-absorbable suspensory sutures.

21 participants were enrolled into the study, as it was designed to be a split mouth study.

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:

1. GM - assessment rule: 0 points- root coverage failure, 3 points- partial root coverage, 6 points- complete root coverage;
2. 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;
3. soft tissue texture (STT) - assessment rule: 0 points - scar formation, 1 point- absence of scars;
4. MGJ - assessment rule: 0 points - MGJ not aligned with the MGJ of adjacent teeth, 1 point- MGJ aligned with the MGJ of adjacent teeth;
5. 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.