Compare pain response following microsurgical conventional flap approach using Piezosurgery versus flapless approach for esthetic crown lengthening in management of patients with short clinical crowns in the upper anterior region.

The conventional approach: Anesthesia will be given followed by bone sounding using William graduated periodontal probe and measuring the pocket depth (using magnification loupes and microsurgical blades)

• Marking the bleeding points
• An internal bevel incision is made followed afterwards by a sulcular incision.
• The gingival collar is eliminated.
• Elevation of the flap is proceeded to allow access for osteoplasty using piezo surgery and an apical position of the bone 2-3mm beyond CEJ.
• Mattress suture (6.0) is made

The intervention approach:

Surgery is done the same as in the conventional approach but without opening a flap, gaining access via a tunneling instrument and piezo tips for osteoplasty

Inclusion Criteria:

1. Patients with healthy systemic condition.
2. Adult patients ˃ 18 years old.
3. The presence of the six upper anterior teeth.
4. Patients who have short clinical crowns due to altered passive eruption classified as Type I subclass B (Coslet, Vanarsdall and Weisgold, 1977).
5. Absence of sites with attachment loss and probing depth (PD) >3 mm.
6. Keratinized gingiva of at least 2mm width (Pontoriero and Carnevale, 2001).
7. Compliance with good oral hygiene.
8. Patients accepts 6-months follow-up period (cooperative patients).
9. Patients provides an informed consent.

Exclusion Criteria:

1. Presence of prosthetic crowns
2. Extensive restorations
3. Extensive incisal edge attrition.
4. Smokers ˃ 10 cigarettes / day
5. Pregnant females