Flaps use in oral surgery
Flap design :There are several principles underlying the design of a mucoperiosteal flap. The flap must:
1. Give adequate access to the site of interest
2. Be designed to maintain a good blood supply
3. be amenable to repair with its margin on sound bone
4. Not risk damage to adjacent structures
5.The vertical releasing incisions always extend to the interdental papilla and never to the center of the labial or buccal surface of the tooth. This ensures the integrity of the gingiva proper, because if the incision were to begin at the center of the tooth, contraction after healing would leave the cervical area of the tooth exposed.
6. A satisfactory surgical field is ensured when the incision extends at least one or two teeth on either side of the area of bone removal. The fact that the base of the resulting flap is broader than its free gingival margin ensures the necessary adequate blood supply for the healing process.
Incision
The scalpel is held in a pen - grip and the hand is supported against slipping. The incision is made with one firm, slow stroke of a sharp blade, which is kept vertical to the epithelial surface .
Incision should be avoided :
• Incision over boney prominences?• Incision through papillae
• Incision over facial aspect midcrwon
• Incision not placed over sound bone
• Vertical incision on area of mental foramen
• Lingual incision in the posterior mandible
• Vertical releasing incision in the posterior palate
Types of Flaps:
1.Trapezoidal Flap(THREE SIDED FLAP):It is formed by a horizontal incision along the gingivae, and two oblique vertical releasing incisions extending to the buccal vestibule
Advantages:
1.Provides excellent access,2.allows surgery to be performed on more than one or two teeth, 3.produces no tension in the tissues,
4. allows easy re-approximation of the flap to its original position and hastens the healing process.
Disadvantages: Produces a defect in the attached gingiva (recession of gingiva).
2. Triangular Flap (2 sided flap) :This flap is the result of an L-shaped incision with a horizontal incision made along the gingival sulcus and a vertical or oblique incision. The vertical incision begins approximately at the vestibular fold and extends to the interdental papilla of the gingiva. The triangular flap is performed labially or buccally on both jaws and is indicated in the surgical removal of root tips, small cysts, and apicoectomies.
Advantage:
• Ensures an adequate blood supply,• satisfactory visualization,
• very good stability and re-approximation;
• it is easily modified with a small releasing incision, or an additional vertical incision, or even lengthening of the horizontal incision.
Disadvantages:
• Limited access to long roots,
• tensions created when the flap is held with a retractor,
• and it causes a defect in the attached gingiva.
3. Envelope Flap
This type of flap is the result of an extended horizontal incision along the cervical lines of the teeth. The incision is made in the gingival sulcus and extends along four or five teeth .it is usually indicated when the surgical procedure involves the cervical lines of the teeth labially (or buccally) and palatally (or lingually), apicoectomy (palatal root), removal of impacted teeth, cysts.
Advantages:
Avoidance of vertical incision and easy re-approximation to original position.Disadvantages:
• Difficult reflection (mainly palatally),
• great tension with a risk of the
ends tearing,
• limited visualization in apicoectomies,
• limited access,
• possibility of injury of palatal vessels and nerves,
• defect of attached gingiva.
4.Semilunar Flap:
This flap is the result of a curved incision, which begins just beneath the vestibular fold and has a bows happed course with the convex part towards the attached gingiva. The lowest point of the incision must be at least 0.5 cm from the gingival margin, so that the blood supply is not compromised. Each end of the incision must extend at least one tooth over on each side of the area of bone removal. The semilunar flap is used in apicoectomies and removal of small cysts and root tips.
Advantages.:
Avoidance of vertical incision and easy re-approximation to original position.Disadvantages:
Difficult reflection (mainly palatally), great tension with a risk of the ends tearing, limited visualization in apicoectomies, limited access, possibility of injury of palatal vessels and nerves, defect of attached gingiva
Postoperative Instructions
Analgesia: Take a painkiller .Edema: After the surgical procedure, the extraoral placement of cold compresses (ice pack wrapped in a towel) over the surgical area is recommended. This should last for 10–15 min at a time, and be repeated every half hour, for at least 4–6 h.
Bleeding: The patient must bite firmly on gauze placed over the wound for 30–45 min. In case bleeding continues, another gauze is placed over the wound for a further hour.
Antibiotics: These are only if the patient has certain medical conditions or inflammation
prescribed
Diet: The patient’s diet on the day of the surgical procedure must consist of cold, liquid foods (pudding, yogurt, milk, cold soup, orange juice, etc.).Oral hygiene: Rinsing the mouth is not allowed for the first 24 h. After this, the mouth may be rinsed with warm or salt water, three times a day for 3–4 days. The teeth should be brushed with a toothbrush and flossed, but the patient should avoid the area of surgery.
Removal of sutures: If sutures were placed on the wound, the patient must have the removed a week later.