Trial of Bilateral Sagittal Split Osteotomy Induced Paresthesia Using Ultrasonic vs. Reciprocating Saw Instrumentation

June 2, 2025 updated by: University of California, San Francisco

In-person Randomized Control Trial of the Incidence of Postoperative Hypoesthesia Among Bilateral Sagittal Split Osteotomy Patients Treated With Ultrasonic vs. Reciprocating Saw Instrumentation

The aim of this prospective study is to analyze the postoperative paresthesias experienced in patients who undergo bilateral sagittal split osteotomies (BSSO) using an ultrasonic saw, versus a reciprocating saw. Patients included in the study are ages 15-45 scheduled to undergo BSSO surgery at the University of California, San Francisco. One side of the patient's mandible will be instrumented with either the Stryker Sonopet ultrasonic saw or traditional reciprocating saw, while the other side will receive the remaining intervention (determined via randomization on the day of surgery). Patient paresthesias will then be analyzed on each side for 3 months postoperatively (at postoperative days: 1, 7, 14, 28, and 84). Sensory examinations will be carried out by blinded examiners using von Frey hairs and two point discrimination testing. Patients will also subjectively rate their sensation on each side. The results will then be analyzed to determine if patient paresthesias, including the severity and duration, differed depending on which instrument was used, the ultrasonic or reciprocating saw.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

32

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • San Francisco, California, United States, 94158
        • UCSF Benioff Children's Hospital
      • San Francisco, California, United States, 94143
        • University of California, San Francisco Medical Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

No older than 45 years (Child, Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Must be undergoing bilateral sagittal split osteotomy surgery with Dr. Saghezchi at UCSF
  • Must agree to return for all follow up visits.
  • Must not have any preexisting V3 nerve paresthesia
  • Must be below the age of 45.

Exclusion Criteria:

  • Persons with preexisting V3 nerve paresthesias
  • Pre-pubertal children will be excluded (per routine practice for this type of surgery).
  • Patients with syndromic genetic conditions that demonstrate clearly different anatomy in the two sides of their jaws will be excluded since the two sides may not be "exchangeable".

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Supportive Care
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Reciprocating saw
The traditional surgical instrument used for cutting bilateral sagittal split osteotomies
Device: Reciprocating saw
See above description
Active Comparator: Sonopet ultrasonic saw
This instrument is being compared to the reciprocating saw
Device: Sonopet ultrasonic saw
Ultrasonic saw to be used on a randomized side of the mandible, reciprocating saw will be used on other side

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Postoperative Hypoesthesia Experienced at 3months
Time Frame: Within 15 days of exact 3 months post-operation
Count of patient mandibles who exhibited **any** hypoesthesia at 3months post-operation (i.e. VFH does not equal 0.008g). VFH filaments measure the minimum weight which a dermatome in question can sense. In this study, the measurements were designed to have the following range: 0.008g, 0.02g, 0.04g, 0.07g, 0.16g, 0.4g, 0.6g, 1g, 1.4g, 2g, 4g, 6g, 8g, 10g, 15g, with 0.008g being no neurosensory deficit. Although 28 persons completed the study, only 21 patients presented for their 3 month followup time, which was defined as with-in 15 days of 90th day after operation. Therefore, the denominator for this outcome is 21, for each intervention arm. The numerator is the number of Left or Right chin areas that exhibited less than "normal" sensation.
Within 15 days of exact 3 months post-operation

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Unfavorable Fracture
Time Frame: This outcome occurs during the surgery. It was measured on the same day.
When a saggital split osteotomy is performed, a controlled fracture of the mandibular ramus is induced which follows an exact intended path of fracture. An unfavorable fracture is one that does not follow this exact path of fracture, and needs to be surgically mended. An unfavorable fracture is associated with poorer post-operative recovery.
This outcome occurs during the surgery. It was measured on the same day.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of California, San Francisco

Investigators

  • Principal Investigator: Sohail Saghezchi, DDS, MD, UC San Francisco

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

July 20, 2021

Primary Completion (Actual)

July 25, 2023

Study Completion (Actual)

July 25, 2023

Study Registration Dates

First Submitted

January 11, 2022

First Submitted That Met QC Criteria

January 11, 2022

First Posted (Actual)

January 25, 2022

Study Record Updates

Last Update Posted (Actual)

June 4, 2025

Last Update Submitted That Met QC Criteria

June 2, 2025

Last Verified

June 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 21-33674

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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