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TMJ-OST
Comparison of Ultrasonic Bone Scalpel, Piezoelectric Surgery and Conventional Reciprocating Saw in Temporomandibular Joint Ankylosis Surgery: Surgical Efficiency, Functional Recovery and Patient-Reported Outcomes
Sponsor study identifier
Secondary identifiers
OTHER_GRANT · Ankara University
OTHER · Ankara University Faculty of Dentistry Clinical Research Ethics Committee
interventional
32
1 country
1
Study Start
April 20, 2022
Actual (reported)Primary Completion
January 20, 2026
Actual (reported)Study Completion
January 20, 2026
Actual (reported)Temporomandibular joint (TMJ) ankylosis is a condition in which the jaw joint becomes partially or completely fused, resulting in restricted mouth opening and difficulties with chewing, speaking, and daily activities. Surgical treatment aims to remove the ankylotic bone and restore normal jaw movement. Different bone-cutting devices can be used during surgery, but their effects on surgical efficiency, postoperative recovery, and quality of life may vary. This prospective, non-randomized comparative clinical study aimed to compare three osteotomy techniques used in TMJ ankylosis surgery: piezoelectric surgery, an ultrasonic bone scalpel, and a conventional reciprocating saw. A total of 32 patients undergoing TMJ ankylosis surgery were included. Eleven patients underwent surgery using a piezoelectric device, eleven using an ultrasonic bone scalpel, and ten using a conventional reciprocating saw. All surgical procedures were performed by the same surgeon under general anesthesia using a standardized surgical protocol. The primary outcome was osteotomy time, measured during surgery. Secondary outcomes included total operative time, intraoperative blood loss, maximum mouth opening, postoperative pain, facial nerve function, and patient-reported quality of life. Facial nerve function was evaluated using the House-Brackmann grading system and the Sunnybrook Facial Grading System. Quality of life was assessed using the SF-12, WHOQOL-BREF, OHIP-14, and UW-QOL questionnaires. Patients were followed for six months after surgery to evaluate functional recovery and changes in quality of life. The study aimed to determine whether the choice of osteotomy device was associated with differences in surgical efficiency, early postoperative recovery, and patient-reported outcomes.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
January 20, 2026
Actual (reported)Click on a node to explore related trials.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
April 20, 2022
Actual (reported)January 20, 2026
Actual (reported)January 20, 2026
Actual (reported)October 14, 2026
Actual (reported)October 20, 2026
Actual (reported)Osteotomy Time
Osteotomy time was defined as the time required to complete osteotomy for resection of the ankylotic bone mass. The duration was measured in seconds using a digital stopwatch, from the initiation to the completion of osteotomy. Osteotomy times were compared among the piezoelectric surgery, ultrasonic bone scalpel, and conventional reciprocating saw groups.
Intraoperatively, during the index surgery.
Total Operative Time
Intraoperatively, during the index surgery.
Eleven patients underwent temporomandibular joint ankylosis surgery using a piezoelectric surgical device (Mectron Medical Technology, Italy).
Eleven patients underwent temporomandibular joint ankylosis surgery using an ultrasonic bone scalpel (BoneScalpel, Misonix Inc., USA).
Ten patients underwent temporomandibular joint ankylosis surgery using a conventional reciprocating saw (S-8 R, W\&H, Austria).
A piezoelectric surgical device (Mectron Medical Technology, Italy) was used to perform osteotomy during temporomandibular joint ankylosis surgery. The device uses ultrasonic microvibrations to selectively cut mineralized bone tissue. Osteotomy was performed to facilitate removal of the ankylotic bone mass while minimizing injury to adjacent soft tissues. Eleven patients underwent surgery using this device.
Ankara University Faculty of Dentistry
Ankara, Ankara, 06560, Turkey (Türkiye)
32 participants (actual enrollment reported by the registry).
First Submitted
October 14, 2026
First Posted
October 20, 2026
An ultrasonic bone scalpel (BoneScalpel, Misonix Inc., USA) was used to perform osteotomy during temporomandibular joint ankylosis surgery. The device uses ultrasonic vibrations for bone cutting and was applied to resect the ankylotic bone mass. Eleven patients underwent surgery using this device.
A conventional reciprocating saw (S-8 R, W\&H, Austria) was used to perform osteotomy during temporomandibular joint ankylosis surgery. The device uses a mechanically driven reciprocating blade to cut bone and facilitate resection of the ankylotic mass. Ten patients underwent surgery using this device.
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Study Start
April 20, 2022
Actual (reported)Primary Completion
January 20, 2026
Actual (reported)Study Completion
January 20, 2026
Actual (reported)Last Updated
October 20, 2026
Record last verified: 2026-10
Individual participant data (IPD) will not be made publicly available to protect patient confidentiality and privacy. The study involves sensitive clinical and patient-reported outcome data. Data sharing is restricted in accordance with the ethical approval and informed consent procedures of the study.
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Source: ClinicalTrials.gov.
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