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Temporomandibular Joint Disc DisplacementNCT07345104

Accuracy of Digital Mandibular Repositioning in Occlusal Reconstruction for Patients With Disc Displacement

A study testing Clinical Clicking Elimination Repositioning Splint, Adjustable Articulator Repositioning Splint and CAD-Designed Anatomical Repositioning Splint in people with Temporomandibular Joint Disc Displacement, run by Fujian Medical University at 1 site in China.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This study evaluates a new, individualized treatment for adolescents with temporomandibular joint disorders (TMD) caused by bilateral, reducible disc displacement. Participants will undergo clinical and imaging examinations, including cone-beam CT (CBCT), MRI, and intraoral digital scanning to create three-dimensional… Read more about this study

Who is it for?
Any age
What is being tested?
Clinical Clicking Elimination Repositioning Splint, Adjustable Articulator Repositioning Splint and CAD-Designed Anatomical Repositioning Splint
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
48 participants
Where
1 siteChina
Study dates
20 Jun 2025to 20 Dec 2025
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages Any age
  • All sexes
  • No healthy volunteers
  • Child, Adult, Older adult

Who may be able to join

  • Diagnosis of reducible temporomandibular joint (TMJ) disc displacement according to the 2014 revised criteria of the International Association for Dental Research;
  • Bilateral reducible disc displacement confirmed by MRI;
  • Reproducible joint clicking during mandibular opening and closing;
  • Permanent dentition with full cognitive and communicative ability;
  • Signed informed consent with good treatment compliance.

Who cannot join

  • Non-reducible disc displacement, osteoarthrosis, isolated myofascial pain, or other conditions not meeting diagnostic criteria;
  • Receipt of other TMJ disorder treatments within the past 3 months;
  • Presence of systemic diseases, psychiatric disorders, or impaired consciousness.

Trial locations and contacts

1 site in 1 country.

China1 site
  • School and Hospital of Stomatology, Fujian Medical University,

    Fuzhou, Fujian, 350000

Other trials in China

About this study

Official title: Accuracy of Digital Mandibular Repositioning in Occlusal Reconstruction for Patients With Disc Displacement: A Randomized Controlled Trial

This study evaluates a new, individualized treatment for adolescents with temporomandibular joint disorders (TMD) caused by bilateral, reducible disc displacement. Participants will undergo clinical and imaging examinations, including cone-beam CT (CBCT), MRI, and intraoral digital scanning to create three-dimensional models of the teeth and jaw. Based on these data, the study team will design and fabricate a personalized repositioning digital occlusal splint for each participant. Patients will be instructed on how to wear the splint and will return for regular follow-up visits to monitor symptoms and adjust the splint as needed. The study aims to improve pain, chewing function, and overall quality of life. All research-related imaging, digital scans, splint fabrication, and follow-up visits will be provided at no cost to participants. Possible risks include temporary discomfort or pressure when first wearing the splint, and the possibility that symptoms may not improve as expected. Participant safety, privacy, and data confidentiality will be strictly protected, and participants may withdraw from the study at any time without affecting their future medical care.

Read the detailed description

Detailed Description This study evaluates four different methods for mandibular repositioning in patients with bilateral reducible temporomandibular joint (TMJ) disc displacement requiring occlusal reconstruction.

Methods of Mandibular Repositioning:

  1. Intraoral Direct Positioning Group: The therapeutic jaw position is determined clinically using the clicking elimination method, where patients open wide until clicking occurs, then gradually retract the mandible while performing opening-closing movements to find the minimal protrusion position without clicking.
  2. Articulator Positioning Group: Uses mechanical facebow transfer and semi-adjustable articulator (Artex CR) with condylar guidance parameters obtained from protrusive and lateral excursion records. The therapeutic position is determined by analyzing CBCT joint space measurements and MRI disc displacement data.
  3. Digital Anatomical Positioning Group: Combines intraoral scanning data with CBCT-reconstructed 3D jaw models. The therapeutic position is determined by referencing MRI disc reduction phase, optimal joint space ratios, and anatomical landmarks using CAD software (Exocad).
  4. Digital Jaw Motion Tracking Group: Integrates 3D jaw models with electronic jaw tracking data (Zebris). The therapeutic position is determined by analyzing condylar movement trajectories (identifying the "figure-8" pattern crossover points indicating disc displacement) combined with dynamic MRI and optimal joint space parameters.

Treatment Protocol: All groups receive digitally designed and manufactured repositioning splints. Patients wear splints 24 hours daily (except during meals) for 3 months, with follow-up adjustments at 2 weeks, 1 month, 2 months, and 3 months.

Imaging Protocol:

  • CBCT (I-CAT FLX): 120 kV, 5 mA, 0.2 mm resolution
  • MRI (GE Discovery MR750w 3.0T): Bilateral TMJ surface coils, oblique sagittal and coronal views in closed-mouth position, oblique sagittal in maximum opening

Assessment Methods:

  • Joint space measurements using Ikeda's method on registered pre- and post-treatment CBCT images
  • Condyle position analysis using Gelb 4/7 position criteria
  • Disc-condyle angle measurement on MRI (>15° defined as disc displacement)
Being tested
Clinical Clicking Elimination Repositioning Splint, Adjustable Articulator Repositioning Splint, CAD-Designed Anatomical Repositioning Splint, Electronic Jaw Tracking Repositioning Splint
Keywords
Reducible disc displacement, Mandibular repositioning, Occlusal splint therapy, Digital dentistry, CBCT, Electronic facebow

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Clinical Clicking Elimination Repositioning SplintDevice

    A custom-fabricated hard acrylic repositioning splint based on manual intraoral mandibular positioning. The splint is created by:

    1. Clinically identifying the optimal jaw position through clicking elimination technique
    2. Taking alginate impressions of maxillary and mandibular arches
    3. Pouring stone models and manually adjusting mandibular model to the determined position
    4. Fabricating a hard acrylic splint with 1-2 mm occlusal clearance
    5. Finishing and polishing the splint Patients wear the splint 24 hours daily (except during meals) for 3 months, with adjustments at 2 weeks, 1 month, 2 months, and 3 months.
  • Adjustable Articulator Repositioning SplintDevice

    A custom-fabricated hard acrylic repositioning splint using adjustable articulator (Artex CR) methodology:

    1. Performing mechanical facebow transfer
    2. Recording condylar guidance parameters in protrusive and lateral excursions
    3. Analyzing CBCT joint space measurements and MRI disc displacement data
    4. Mounting study models on Artex CR articulator with precise condylar settings
    5. Manually adjusting splint to achieve optimal mandibular position
    6. Fabricating hard acrylic splint with 1-2 mm occlusal clearance Patients wear the splint 24 hours daily (except during meals) for 3 months, with adjustments at 2 weeks, 1 month, 2 months, and 3 months.
  • CAD-Designed Anatomical Repositioning SplintDevice

    A digitally designed and 3D-printed repositioning splint using advanced digital workflow:

    1. Performing intraoral digital scanning (iTero Element)
    2. Acquiring CBCT scan (I-CAT FLX)
    3. Importing MRI disc displacement data
    4. Using CAD software (Exocad) to:
    • Overlay intraoral scan with CBCT 3D model
    • Reference MRI disc reduction phase
    • Calculate optimal joint space ratios
    1. Digitally designing splint with precise mandibular positioning
    2. Fabricating hard acrylic splint with 1-2 mm occlusal clearance Patients wear the splint 24 hours daily (except during meals) for 3 months, with adjustments at 2 weeks, 1 month, 2 months, and 3 months.
  • Electronic Jaw Tracking Repositioning SplintDevice

    A digitally designed repositioning splint using electronic jaw motion tracking:

    1. Performing 3D jaw motion tracking (Zebris JMA system)
    2. Capturing mandibular movement trajectories
    3. Identifying "figure-8" pattern crossover points indicating disc displacement
    4. Integrating dynamic MRI data
    5. Analyzing optimal joint space parameters
    6. Using CAD software to design precise mandibular positioning splint
    7. Fabricating hard acrylic splint with 1-2 mm occlusal clearance Patients wear the splint 24 hours daily (except during meals) for 3 months, with adjustments at 2 weeks, 1 month, 2 months, and 3 months.
Study groups in NCT07345104
Study groupRoleWhat they receive
Intraoral Direct PositioningActive comparatorTherapeutic mandibular position is determined using the clinical clicking elimination method. Patients perform wide opening until clicking occurs, then gradually retract the mandible while making opening-closing movements to identify the minimal protrusion position without clicking. A repositioning splint is fabricated based on this position.
Receives: Device: Clinical Clicking Elimination Repositioning Splint
Articulator PositioningExperimentalTherapeutic mandibular position is determined using a semi-adjustable articulator (Artex CR) with mechanical facebow transfer. Condylar guidance angles are obtained from protrusive and lateral excursion records. The optimal position is calculated based on CBCT joint space measurements and MRI disc displacement data. A repositioning splint is fabricated accordingly.
Receives: Device: Adjustable Articulator Repositioning Splint
Digital Anatomical PositioningExperimentalTherapeutic mandibular position is determined by integrating intraoral scanning data with CBCT-reconstructed 3D jaw models using CAD software (Exocad). The optimal position is calculated by referencing MRI disc reduction phase, ideal joint space ratios (anterior:superior:posterior = 1:1.3:1), and anatomical landmarks. A repositioning splint is digitally designed and 3D-printed.
Receives: Device: CAD-Designed Anatomical Repositioning Splint
Digital Jaw Motion TrackingExperimentalTherapeutic mandibular position is determined by integrating 3D jaw models with electronic jaw tracking data (Zebris JMA system). The optimal position is identified by analyzing condylar movement trajectories, specifically locating the crossover points of the "figure-8" pattern indicating disc displacement, combined with dynamic MRI and joint space parameters. A repositioning splint is digitally designed and 3D-printed.
Receives: Device: Electronic Jaw Tracking Repositioning Splint

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change in Temporomandibular Joint Space Ratio

    Quantitative assessment of changes in temporomandibular joint space using Cone Beam Computed Tomography (CBCT) with Ikeda's method.

    Measured: Baseline and 3 months post-treatment

  2. Change in Disc-Condyle Relationship Angle

    Quantitative assessment of disc displacement using Magnetic Resonance Imaging (MRI) with angle measurement technique.

    Measured: Baseline and 3 months post-treatment

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted15 Jan 2026
  2. Study start20 Jun 2025
  3. Primary completion20 Dec 2025
  4. Study completion20 Dec 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
Participants are assigned to one of four parallel groups based on patient preference and clinical feasibility (non-randomized allocation): * Group A (Intraoral Direct Positioning): Therapeutic mandibular position determined by clinical clicking elimination method. * Group B (Articulator Positioning): Therapeutic position determined using semi-adjustable articulator with facebow transfer and condylar guidance records. * Group C (Digital Anatomical Positioning): Therapeutic position determined by integrating intraoral scanning, CBCT, and MRI data using CAD software. * Group D (Digital Jaw Motion Tracking): Therapeutic position determined
Masking
Double blind
Who is masked
Investigator, Outcomes assessor
Enrolment
48 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07345104
Sponsor's protocol ID
2024GGA070
Status last verified
Dec 2025
First submitted
22 Dec 2025
Last updated
11 Feb 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A study testing Clinical Clicking Elimination Repositioning Splint, Adjustable Articulator Repositioning Splint and CAD-Designed Anatomical Repositioning Splint in people with Temporomandibular Joint Disc Displacement, run by Fujian Medical University at 1 site in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 11 Feb 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in Temporomandibular Joint Space Ratio (time frame: Baseline and 3 months post-treatment). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 11 Feb 2026.

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