Connective Tissue Graft in Treatment of Recession

Hpp234

Normally, gingival margin is located at or coronal to cementoenamel junction (CEJ). When gingival margin migrates apical to CEJ, it is called a gingival recession. Gingival recession may occur due to excessive tooth brushing trauma. Localised plaque induced inflammatory process, malocclusion, and orthodontic tooth movement, as a part of generalised chronic periodontitis.

Treatment

For treating gingival recession it is important to diagnose the cause of recession. Elimination of causative factors is the most important step in treating recessions. This may include oral hygiene technique modifications, treating periodontitis, elimination of plaque retentive structures, tooth repositioning, etc. After this, surgical intervention can be considered if the goal is to correct the defect and possible root coverage by regenerated gingiva.

Indications for Root Coverage

Highly esthetic demands
Lack of keratinised gingiva
Continuous recession even after eliminating causative factors
Root hypersensitivity

Connective Tissue Graft (CTG)

This technique utilises subepithelial CTG from the palate. Palate has keratinised tissue with dense lamina propria. The connective tissue grafting along with the various flap techniques can be used to treat recessions. The coronally advanced flap plus connective tissue grafting is still the gold standard in treating recessions.

Indications for CTG

Inadequate tissue around recession defect
Wide gingival recession defect
Multiple gingival recessions

Advantages

It has high predictability
Graft receives abundant blood supply from the inside of the flap as well the periosteum- connective tissue
Wound can be sutured at palatal donor site after harvesting of connective tissue graft. Which make hemostasis easy and healing rapidly.
Less discomfort and pain during healing
Better aesthetic results
Multiple gingival recession defects can be treated.

Disadvantages

Technically demanding
As the graft is thick, the grafted tissue is thick. Gingivoplasty may require sometimes to obtain better morphology

Contraindications

If the thickness of donor tissue is less. The thickness of the connective tissue graft for root coverage should be 1.5-2.0 mm, and the thickness of the palatal flap should be 1.5-2.0 mm after graft harvesting, to prevent further necrosis. As a result, at least 3-mm thickness is required at the donor site of palatal soft tissue.

CTG Technique

Local anaesthesia application
Preparation of exposed root surface
Recipient bed preparation
CTG harvesting
Suturing and stabilizing the graft at the recipient site
Management of donor site

Preparation of the Exposed Root Surface

Scaling and root planning of the exposed root surface. If the goal is to obtain root coverage over existing caries or class V restoration, caries and restoration must be completely removed. Recent studies have shown root coverage over restored root surfaces too. Convexity of the root should be eliminated with diamond burs. Chemical root surface modifiers such as citric acid, tetracycline, EDTA is used to demineralise and decontaminate the root surface and to expose the collagen fibres. This is to facilitate attachment of fibres to the root surface. Evidence recently demonstrated that the use of such chemical modifiers provides no additional benefit of clinical significance. (Mariotti et al 2003).

Preparation of the recipient bed

The recipient bed is prepared for the connective tissue graft by a split thickness flap which is performed so as the periosteum remains attached to the underlying osseous structure. The split thickness flap is prepared by sharp dissection using 15 c blade. Presence of any muscle fibres or attachment is also eliminated so that flap is mobile and can be coronally repositioned without any tension.

Harvesting CTG from the Palate

The CTG is harvested from the hard palate area. The ideal location for harvesting the graft is 5-6 mm apical to the gingival margin of the palatal aspects of the maxillary premolars and the mesial half of the maxillary first molar. Incisions are made to gain access to the connective tissue. The incisions create a trap door effect where a flap is raised toward the palate, and then the connective tissue is harvested. There is different incision technique's single incision, double incision, L- shaped incision. The ideal thickness of the graft is 1-1.5 mm thick. During harvesting, the connective tissue extra precautions should be taken to avoid injury to the vital structures like the greater palatine artery. Depending on the depth of the palatal vault, generally, the artery is about 12 mm apical to the gingival margin. Reiser et al 1996, Monnet-Corti et al 2006.

Placement of the Graft

The harvested connective tissue graft is immediately placed in the recipient site and secured into position with sutures. The 5-0 silk or 6-0 absorbable sutures can be used. Optimised healing requires the graft to be in intimate contact with the recipient bed with the absence of any dead space. Suturing techniques play an important role in the success of any periodontal plastic surgery.

Management of the Donor Site

For better healing, positive hemostasis is required at the donor site and can be achieved by application of pressure. Hemostatic agents like collagen sponges may be used to aid with hemostasis. Ligation of the greater palatine artery with a suture in case of injury to the artery. For patient comfort, dressing in the form of tinfoil may be placed or palatal stent that should be pre-surgically fabricated may be inserted.

Post-Operative Maintenance

Patient should be recalled for reassessment in between 2 weeks following surgery for a post-operative visit and suture removal better to use absorbable sutures. Patient should be instructed to avoid tooth brushing and flossing around the surgical site for first 2 weeks. Gentle rinsing with chlorhexidine gluconate 0.12% or 0.2 % should be advised.

Causes of CTG Failure

Insufficient interdental bone and soft tissue heights
If horizontal incision placed apical to the CEJ
Reflection of interdental papilla
Flap tearing
Inadequate or improper root planing
Failure to provide sufficient blood supply from surrounding tissue due to inadequate recipient site preparation is the main cause for failure
CTG too small
Graft too thick
Failure to cover graft coronally by the flap

Conclusion

Management of gingival recession requires the identification and elimination of the etiology. Many recessions do not require treatment. In some cases, the decision may be to treat the recession with a root coverage procedure. One of the most predictable techniques is CTG.