Esthetic Crown Lengthening With Closed Piezoelectric in Comparison to Open Flap Approach

  • End date
    Jan 18, 2025
  • participants needed
  • sponsor
    Augusta University
Updated on 4 October 2022


In this randomized clinical trial, the investigators are comparing two different approaches for Esthetic crown lengthening- a minimally invasive approach using piezoelectric (PZ) and a traditional open flap approach (OF).


The altered passive eruption is diagnosed when there is an excessive gingival display with short clinical crowns. Esthetic crown lengthening (ECL) is the most common surgical treatment of altered passive eruption. Traditional ECL involves osseous resection with gingivectomy or apical displaced gingiva. The amount of soft and hard tissue removal in this technique aims to provide a healthy and esthetically acceptable crown height. However, gingival tissue coronal rebound is one of the most noted post-operative complications of traditionally used techniques. On the other hand, surgical techniques that include flap reflection may cause more coronal displacement of the gingival margin. Hence, it is crucial to assess different surgical techniques to determine the most effective technique that gives the required outcomes with maximum patient satisfaction.

Piezoelectric bone surgery delivers high precision in resection, good tactile sensibility, and permits a selective cut of mineralized tissue while sparing soft tissue. Further, the minimally invasive technique (mECL) was suggested to reduce pain, post-op discomfort, and procedure duration, and to accelerate the healing process. The mECL technique conveys a potential alternative approach as a sutureless, atraumatic, and less invasive technique that has been shown to increase patient satisfaction and comfort. In addition, using piezoelectric for osseous resection in this closed approach increases the favorable surgical outcomes. However, the osseous resection in mECL may be incomplete and results in a coronal rebound on the gingival contour. In addition, osseous resection in this approach is very technique sensitive to avoid root damage and uneven bone resection. A few studies and even a fewer clinical trials evaluated the clinical outcome of mECL using piezoelectric for osseous resection (PZ). Hence, in this randomized clinical trial, gingival margin and bone crest stability will be evaluated after a minimally invasive approach using piezoelectric (PZ) and a traditional open flap approach (OF).

Condition Altered Passive Eruption of Teeth
Treatment ECL- mPZ, ECL-OF
Clinical Study IdentifierNCT05478317
SponsorAugusta University
Last Modified on4 October 2022


Yes No Not Sure

Inclusion Criteria

Patients with a gummy smile due to APE (Type 1B) in two or more maxillary anterior teeth
Patients with normal muscular efficiency of the upper lip
Patients with no vertical skeletal defects

Exclusion Criteria

Patients with systemic condition that prevent periodontal surgery
Patients who smoke
Patients with previous periodontal surgery in the same area
Pregnant women
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer  to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact


Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

Learn more

Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

Learn more

Similar trials to consider


Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note