[Digital design combined with endoscopic minimally invasive extraction of impacted mandibular third molars with roots in contact with the mandibular canal].

To study the clinical efficacy of digital design combined with three-dimensional (3D) printing model minimally invasive extraction of complex impacted mandibular third molars. Eight patients who visited the Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology from April 2023 to March 2024 were included, including 3 males and 5 females, aged from 27 to 57 years old. The impacted mandibular third molars of all patients were closely related to the mandibular canal, and part of the dental tissue entered the mandibular canal.

Healing Process of Old Mandibular Condylar Head Fractures: A Report of Two Cases.

A condylar head fracture in the mandible is often misdiagnosed as a contusion of the temporomandibular joint (TMJ). Moreover, they are often overlooked by general practitioners as the fragments are small, making them difficult to identify. This report describes 2 cases of old mandibular condylar head fractures: one involving an 84-year-old woman referred to our dental office with suspected medication-related osteonecrosis of the jaw; and another involving a 23-year-old man who visited with the chief complaint of slight pain in the left TMJ.

Biallelic variants in CCN2 underlie an autosomal recessive kyphomelic dysplasia.

Kyphomelic dysplasia is a rare heterogenous group of skeletal dysplasia, characterized by bowing of the limbs, severely affecting femora with distinct facial features. Despite its first description nearly four decades ago, the precise molecular basis of this condition remained elusive until the recent discovery of de novo variants in the KIF5B-related kyphomelic dysplasia. We ascertained two unrelated consanguineous families with kyphomelic dysplasia.

Evaluation of mandibular motions in patients with anterior disc displacement during mouth opening and closing using finite helical axis.

Understanding temporomandibular joint (TMJ) kinematics is essential for the clinical diagnosis and treatment of TMJ disorders. Yet, a comprehensive description of mandibular motion information in patients with anterior disc displacement (ADD) is lacking. The finite helical axis (FHA) is a mathematical model describing the motion of a rigid body in space.

Evaluation of stiffness-matched, 3D-printed, NiTi mandibular graft fixation in an ovine model.

Background: Manually bent, standard-of-care, Ti-6Al-4V, mandibular graft fixation devices are associated with a significant post-operative failure rate. These failures require the patient to endure stressful and expensive re-operation. The approach recommended in this report demonstrates the optimization of graft fixation device mechanical properties via "stiffness-matching" by varying the fixation device's location, shape, and material composition through simulation of the device's post-operative performance.

Anterior Disc Displacement and Cortication Patterns in the Temporomandibular Joint.

BACKGROUND Anterior reduction disc displacement (ARDD) of the temporomandibular joint (TMJ) can present with pain and clicking of the jaw when chewing. This study aimed to evaluate the relationship between articular eminence cortication (AEC) and mandibular condyle cortication (MCC) in 81 patients with ARDD of the TMJ using cone beam computed tomography (CBCT) imaging. MATERIAL AND METHODS We examined images of 142 patients who applied to the outpatient clinic between 2022 and 2024 for various reasons and whose radiographic records included CBCT and MRI images.

[Overview of the development of temporomandibular joint surgery in China from the perspective of oral and maxillofacial surgeons].

Temporomandibular joint (TMJ) surgery in China, as an important part of oral and maxillofacial surgery, has made significant progress in the past 20 years. It is mainly reflected in the reduction of TMJ dislocated joint disc, prosthetic total TMJ reconstruction, and the treatment of adult condylar fracture. There are major controversies about the surgical methods and indications for the reduction of the dislocated/displacement joint disc of the temporomandibular disorders.

Correlation Between Temporomandibular Joint Disc Perforation and Degenerative Joint Changes: A CBCT and Clinical Analysis.

Objectives: To analyse the correlation between temporomandibular joint (TMJ) disc perforation and degenerative joint changes (DJC) on cone-beam computed tomography (CBCT) and related factors.

Study Design: A total of 238 female patients with anterior disc displacement without reduction (ADDwoR), accounting for 348 affected joints, requiring TMJ disc open anchorage surgery were included in the study conducted from June 2021 to August 2022. Following TMJ disc open anchorage surgery, patients were divided into two groups: disc perforation (DP) and disc non-perforation (DNP).

Functional Orthodontic Therapy for Mandibular Condyle Fracture: A Systematic Review.

The objective of this study was to compile the currently available evidence regarding the functional and morphologic outcomes of functional orthodontic therapy for mandibular condyle fracture. We performed searches in PubMed and Google Scholar as well as manually (IOK issues 2008-2019) using the keywords "trauma", "TMJ", "activator", "condylar fracture", "fracture", "mandibular condylar fracture", "occlusal splint" and "functional appliance". Screening and analysis of study eligibility were performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA).

Cranio-Maxillo-Facial Reconstruction with Polyetheretherketone Patient-Specific Implants: Aesthetic and Functional Outcomes.

Background: Reconstructing cranio-maxillo-facial defects presents significant challenges. This study evaluates the results of polyetheretherketone patient-specific implants (PEEK PSIs) in primary and secondary cranio-maxillo-facial reconstructions, with a focus on aesthetic and functional outcomes and long-term complications.

Methods: From October 2009 to February 2023, 45 patients underwent cranio-maxillo-facial reconstructions with PSIs.

Conservative Management of Dislocated Pediatric Unilateral Condylar Fracture Using Orthodontic Treatment and Guiding Elastics.

Introduction: Mandibular fractures in children, when compared to adults, are quite less common. Treatment approaches for mandibular fracture differ in children due to their growth and developing dentition. Minimal manipulation of bony architecture is done to achieve a stable position.

Improvement of the temporomandibular joint symptoms due to the condylar position change following modified L-shaped intraoral vertico-sagittal ramus osteotomy: a single-center, retrospective study.

Purpose: Intraoral vertico-sagittal ramus osteotomy (IVSRO) was first reported by Choung in 1992 as a surgical procedure to decrease postoperative condylar dislocation. In 2017, Iwanaga et al. developed modified L-shaped IVSRO (mIVSRO) to reduce postoperative nerve dysfunction and achieved favorable outcomes.

Transoral endoscopic assisted reduction and internal fixation of mandibular condylar neck fractures with short condylar segment.

This study aimed to assess the reliability and safety of transoral endoscopic-assisted reduction internal fixation (TERIF) for treating short-segment condylar neck fractures (CNF), including hardware removal. Patients with displaced CNF and short condylar segments treated using TERIF were included in the study. Clinical evaluation covered dental occlusion, range of mouth opening, deviation during mouth opening, protrusion, laterotrusion, pain, and chewing.

Mandibular Deviation With Longstanding Temporomandibular Joint Dislocation Caused by Lateral Pterygoid Muscle Hyaline Degeneration.

The present report described a rare case of mandible deviation with longstanding unilateral temporomandibular joint dislocation caused by lateral pterygoid muscle hyaline degeneration. A 28-year-old male was referred for mandible deviation for 2 years. It was found that the left condyle was dislocated just below the articular eminence with the dilated capsule in magnetic resonance imaging images.

Effect of the application of digital technology-assisted optimization in the process of adjusting jaw position.

Objectives: The aim of this study was to demonstrate a novel jaw position adjustment technique derived from digital twins and evaluate the application effect of digital technology-assisted optimization in the process of adjusting jaw position on patients with temporomandibular disorders (TMD).

Methods: A total of 74 patients with TMD who attended the Department of Temporomandibular Joint, West China Hospital of Stomatology, Si-chuan University, between June 2022 and May 2023 were selected. The patient's initial computed tomography (CT) and bilateral temporomandibular joint data obtained by magnetic resonance imaging (MRI) were collected.

Anterior dislocation of the coronoid process above a ZMC fracture: case report and a technical note.

Zygomaticomaxillary complex fractures are very common in maxillofacial trauma and may be associated with fractures of the coronoid process. We report a case of dislocation of the coronoid process above a zygomaticomaxillary complex fracture locking the mandible. We also report the surgical management of this uncommon case and its follow-up.

The utilization of decision trees on orthopantomographic and lateral panoramic graphs for the diagnosis of unilateral anterior disc displacement of the temporomandibular joint.

Background: Investigation is to utilize decision trees in conjunction with orthopantomography (OPT) and lateral panoramic graphy (LPG) to diagnose unilateral anterior disc displacement (ADD) of the temporomandibular joint.

Methods: In this study, 161 patients with images obtained through all three imaging methods, MRI, OPT, and LPG, were selected from the archives. The participants were categorized into two groups: the study group, comprising 89 patients with unilateral anterior disc displacement, and the control group, consisting of 72 healthy individuals.

Evaluation of the Efficacy of Three Times Titanium Plate Gradual Fixation Method in the Treatment of Extracapsular Condylar Fractures.

Objective: An improved method of treating inwardly dislocated mandibular extracapsular condylar fracture-three times titanium plate gradual fixation method was introduced, and the clinical efficacy of this method was evaluated.

Methods: Twenty patients with extracapsular condylar fractures who underwent surgical treatment using the three times titanium plate gradual restoration and fixation method in the Department of Oral Craniomaxillofacial Surgery of the Ninth People's Hospital of Shanghai from November 2020 to June 2023 were selected as the study subjects.

Results: After condylar restoration 22 sides reached healing and 1 side was basically healed; in 3 months after the operation, the degree of opening the mouth and the type of the opening of the mouth reached normal, and 1 case had mildly poor occlusion, which required to be further adjusted through orthodontics, and there was no temporomandibular function disorder or facial nerve function damage.

Analysis of clinical changes and magnetic resonance imaging features of 37 patients with temporomandibular joint disc condylar complex with anterior disc displacement without reduction.

Objectives: This study aims to investigate clinical outcomes, imaging changes, and age differences with regard to temporomandibular joint disc condylar complex with anterior disc displacement without reduction (ADDWoR).

Methods: A total of 37 patients (45 lateral joints) with ADDWoR who were admitted to The First Affiliated Hospital of Zheng Zhou University from January 2016 to June 2023 were selected. The patients were composed of 4 males and 33 females and had an average age of 23.

Ultrasound-guided intraoral botulinum toxin injection into the lateral pterygoid muscle for chronic temporomandibular joint dislocation.

Objectives: Botulinum toxin type A (BTX), a powerful neurotoxin, can be an effective treatment choice for diverse muscular disorders and can reduce abnormal muscle activities. Abnormal movements of the mandible can be caused by involuntary and uncontrolled contractions of the lateral pterygoid muscle (LP) in various pathological situations. Previous reports have shown that BTX can reduce abnormal contractions of the LP.

Feasibility of simultaneous TMJ arthroscopy in ADDwoR patients undergoing orthognathic surgery for jaw deformity.

This study evaluated the feasibility of simultaneous temporomandibular joint (TMJ) arthroscopy and orthognathic surgery as a new treatment strategy for anterior disc displacement without reduction (ADDwoR) patients with severe jaw deformities. Twelve ADDwoR patients with facial deformities who underwent arthroscopy and orthognathic surgery between September 2015 and December 2019 were retrospectively evaluated. Pre- and postoperative maximum incisal opening (MIO) and joint pain were recorded.

Effectiveness of Rehabilitation for Disk Displacement of the Temporomandibular Joint-A Cross-Sectional Study.

(1) : Dislocations of articular disk can occur as a result of parafunctions in the Temporo Mandibular Joint (TMJ), which limits the opening of the mandible and other movements. The aim of this study was to evaluate the effectiveness of rehabilitation in patients with disk displacement of the TMJ. A total of 327 subjects with Temporo Mandibular Disorders underwent stomathognatic physiotherapy.

Correlation between temporomandibular joints and craniocervical posture in patients with bilateral anterial disc displacement.

Objective: To study the changes of temporomandibular joints and craniocervical posture in adult patients with bilateral anterior disc displacement, and to explore their correlation, which may provide some clinical value for clinical diagnosis and treatment planning.

Methods: Ninety-eight adult patients were divided into 3 groups: 29 patients in bilateral disc normal position group (BN), 33 patients in bilateral Anterior Disc Displacement With Reduction group (ADDWR) and 36 patients in bilateral Anterior Disc Displacement Without Reduction group (ADDWoR). Dolphin and Uceph software were used to measure 14 items of temporomandibular joint and 11 items of craniocervical posture for comparison and correlation analysis between groups.