Changes in temporomandibular joint spaces after arthroscopic disc repositioning: a self-control study.

Disc repositioning is a common procedure for patients with anterior disc displacement (ADD). The purpose of this retrospective record-based study was to evaluate changes in the widths of joint spaces and condylar position changes in patients with unilateral ADD following arthroscopic disc repositioning, with the healthy sides as self-control, using magnetic resonance images (MRI).Widths of anterior, superior, and posterior joint spaces (AS, SS, and PS) were measured.

Does condylar height decrease more in temporomandibular joint nonreducing disc displacement than reducing disc displacement?: A magnetic resonance imaging retrospective study.

The aim of the study was to compare condylar height changes of anterior disc displacement with reduction (ADDwR) and anterior disc displacement without reduction (ADDwoR) in temporomandibular joint (TMJ) quantitatively, to get a better understanding of the changes in condylar height of patients with anterior disc displacement who had received no treatment, and to provide useful information for treatment protocol. This longitudinal retrospective study enrolled 206 joints in 156 patients, which were divided into ADDWR group and ADDwoR group based on magnetic resonance imaging examination. The joints were assessed quantitatively for condylar height at initial and follow-up visits.

Results of radiological follow-up of untreated anterior disc displacement without reduction in adolescents.

Our aim was to assess the progression of disease without treatment in adolescents with non-reducible anterior disc displacement (ADD) using serial magnetic resonance images (MRI). We retrospectively reviewed all patients under the age of 20 years who had unilateral non-reducible ADD and had had two MRI during a period of 6 months with no intervention. A total of 124 patients (101 female and 23 male) with a mean (range) age of 16 (10-20) years had 2 MRI at least 6 months apart (mean (range) 14 (6-47) months).

Changes in the temporomandibular joint space after functional treatment of disk displacement with reduction.

This study aimed to evaluate the changes of temporomandibularjoint (TMJ) space in the treatment of disk displacement with reduction (DDWR) for class II cases. Forty-two adolescent patients with unilateral DDWR, who were successfully treated by functional appliance, were selected in this study. Magnetic resonance imaging scans were used before treatment (T1), at the start of treatment (T2), and after functional treatment (T3).

Pigmented villonodular synovitis of the temporomandibular joint with intracranial extension.

Pigmented villonodular synovitis is an uncommon benign tumor-like proliferative lesion with an undetermined origin. Involvement of the temporomandibular joint is uncommon. Although pigmented villonodular synovitis is a benign lesion, it can grow with an aggressive pattern, and it extends extra-articularly in most of the reported cases, about one-third of them exhibiting intracranial involvement.

Comparison of multi-space infections of the head and neck in the elderly and non-elderly people, part II: the influencing factors of the outcomes.

Objective: This study aims to identify significant predictors of 3 outcomes in the aged patients and non-elderly with multi-space infections of the head and neck: the number of incisions, the length of hospital stay, and complications.

Patients And Methods: A retrospective study was conducted on 242 patients receiving treatment for severe multi-space infections of the head and neck region. Study variables were categorized as demographics, clinical parameters, and laboratory values.

Magnetic resonance imaging applied to the diagnosis of perforation of the temporomandibular joint.

Objective: To investigate the diagnostic accuracy of magnetic resonance imaging (MRI) for perforation of temporomandibular joint (TMJ).

Methods: Consecutive 1845 patients (2524 joints) diagnosed as internal derangement (ID) of TMJ were collected from April 2003 to March 2010 in our department. All the patients were examined by MRI and treated by arthroscopy or open surgeries.

Can puncture increase the risk of intra-articular adhesion in the temporomandibular joint?

Purpose: This study aims to compare the incidence and severity of intra-articular adhesion under arthroscopy between patients with and without a history of joint puncture.

Patients And Methods: Eighty-nine patients with internal derangements of TMJ who underwent arthroscopic disc repositioning and suturing surgery from February 2008 to September 2008 were included in this study. Patients were divided into 2 groups based on whether the patient had undergone joint puncture before surgery or not.

Marsupialization facilitates eruption of dentigerous cyst-associated mandibular premolars in preadolescent patients.

Purpose: The purpose of the present study was to investigate the eruption of dentigerous cyst (DC)-associated mandibular premolars after marsupialization in preadolescents.

Patients And Methods: The present study was a retrospective cohort study of preadolescent patients with DCs who were treated as outpatients at the Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine. For our study, the data from these patients were collected, and the eruption of the premolar teeth, along with related factors, such as the interval to eruption, cusp depth, angulation, cyst size, and eruption space, were analyzed for the cyst group compared with the noncyst control group.

An orthodontic technique for minimally invasive extraction of impacted lower third molar.

Purpose: To present a novel orthodontic approach for minimally invasive extraction of impacted mandibular third molars (M3s) close to the inferior alveolar nerve (IAN).

Patients And Methods: Eight patients (8 M3s) requiring extraction of M3s were included in this study; there were 2 cases of horizontal impaction, 4 of mesioangular impaction, and 2 of vertical impaction. Cone-beam computed tomogram showed that the roots of impacted M3s in 2 cases interrupted the cortices of the mandibular canal, and those in the other 6 cases were very close to the IAN.

Anatomic relationship between impacted third mandibular molar and the mandibular canal as the risk factor of inferior alveolar nerve injury.

Our aim was to explore the relation between the site of the mandibular canal and neurosensory impairment after extraction of impacted mandibular third molars. We organised a retrospective study of 537 extractions in 318 patients in which the affected tooth was intersected by the mandibular canal. This was verified by cone-beam computed tomography (CBCT), and we analysed the relation between the site of the canal and the likelihood of injury to the inferior alveolar nerve (IAN) after extraction of the third molar.

Synovial chondromatosis of the temporomandibular joint with articular eminence extension.

Synovial chondromatosis (SC) of the temporomandibular joint is a rare benign lesion that can extend to the adjacent bony tissue. Most studies in the literature reported cases of SC of the temporomandibular joint with extension to the skull base, but there has been no report of intracranial extension through the articular eminence. The current study reports on the case of SC with articular eminence extension that was treated via combined trans-zygomatic tempora and preauricular approach and acquired good effect with 44 months of follow-up.

Arthroscopic management for synovial chondromatosis of the temporomandibular joint: a retrospective review of 33 cases.

Purpose: To present clinical, radiologic, and arthroscopic results of patients with synovial chondromatosis of the temporomandibular joint; to introduce a technique for removal of loose bodies in different areas; and to summarize the indications of therapeutic arthroscopy according to the magnetic resonance imaging (MRI) features.

Patients And Methods: From April 2001 to April 2010, 33 consecutive patients underwent arthroscopy. Their demographics, clinical manifestations, imaging studies, arthroscopic findings, treatments, and outcomes were reviewed.

Synovial chondromatosis in the inferior compartment of the temporomandibular joint: different stages with different treatments.

Purpose: To discuss a new classification and the treatment principles of synovial chondromatosis (SC) in the inferior compartment of the temporomandibular joint (TMJ).

Patients And Methods: Five cases of SC in the inferior compartment were treated in an open manner between January 2008 and May 2011. Each case had different clinical and radiologic aspects and was treated with different surgical therapies.

Problem-based learning in oral and maxillofacial surgery education: the Shanghai hybrid.

Purpose: A new hybrid course was designed for the practice of oral and maxillofacial surgery education, which included a problem-based learning (PBL) preclinical course and a 1-year clinical rotation under supervision. The aim of this study was to evaluate the effect of this hybrid course.

Materials And Methods: Eighty-seven students were included from 2006 to 2008.

Changes in disc position, disc length, and condylar height in the temporomandibular joint with anterior disc displacement: a longitudinal retrospective magnetic resonance imaging study.

Purpose: To quantitatively assess the changes in disc position relative to the condyle, disc length, and condylar height, with magnetic resonance imaging in patients with anterior disc displacement of the temporomandibular joint who had received no treatment, to provide useful information regarding treatment planning.

Patients And Methods: The study included 83 joints in 62 patients. The joints were assessed quantitatively for the disc position relative to the condyle, disc length, and condylar height on magnetic resonance imaging scans of the temporomandibular joint at initial and follow-up visits.

Malocclusion as a common occurrence in temporomandibular joint arthroscopic disc repositioning: outcomes at 49 days after surgery.

Purpose: To evaluate the incidence, clinical manifestation, and prognosis of malocclusion after arthroscopic disc repositioning and suturing of the temporomandibular joint (TMJ).

Patients And Methods: The study included 211 patients (270 joints) with internal derangement of the TMJ who underwent arthroscopic disc repositioning and suturing from November 2005 to August 2006. The occlusion was checked and recorded preoperatively and at different intervals (0, 3, 7, 14, 21, 28, 35, 42, and 49 days after surgery) for all patients.

Use of Coblation in arthroscopic surgery of the temporomandibular joint.

Purpose: To evaluate the effectiveness of Coblation in temporomandibular joint (TMJ) arthroscopic surgeries and to preliminarily evaluate the clinical effects.

Materials And Methods: Arthroscopic Coblation, combined with disc suturing, was performed in 419 TMJs from July 2001 to March 2007 by use of the ArthroCare System 2000 radiofrequency machine (ArthroCare, Sunnyvale, CA). All patients had stage II to V internal derangement, according to the classification of Wilkes.

Arthroscopic management of septic arthritis of temporomandibular joint.

This article reports on 7 patients with septic arthritis of the temporomandibular joint (TMJ) who were managed with arthroscopy between 1998 and 2007. The common symptoms were trismus and pain. A series of imaging studies showed widening of joint space in 1 patient with plain film; MRI demonstrated increased joint effusion in 4 patients; accompanying cellulitis in adjacent tissues was discerned by CT in 2 patients.

New arthroscopic disc repositioning and suturing technique for treating internal derangement of the temporomandibular joint: part II--magnetic resonance imaging evaluation.

Purpose: To evaluate the efficiency of an arthroscopic suturing technique for stabilizing anteriorly displaced discs in patients with internal derangement of the temporomandibular joint (TMJ) by magnetic resonance (MR) imaging.

Patients And Methods: Six hundred thirty-nine patients (764 joints) diagnosed as having stages II to V of internal derangement were treated with arthroscopic disc repositioning and suturing from August 2004 to March 2007. Consecutive MR images were used to evaluate internal derangement before and approximately 1 to 7 days after the operation for all 639 patients.

Septic arthritis of the temporomandibular joint: a retrospective review of 40 cases.

Purpose: Septic arthritis of the temporomandibular joint is an uncommonly reported entity. The aim of the present study was to review the cases treated at our clinic, analyze the characteristics of this disease and the responses to management, and recommend a protocol for managing suspected cases.

Patients And Methods: A total of 40 consecutive patients were included from 1995 to 2007.

Simultaneous pigmented villonodular synovitis and synovial chondromatosis of the temporomandibular joint: case report.

Pigmented villonodular synovitis and synovial chondromatosis are benign nonneoplastic proliferations originating in the synovium of unknown cause. Involvement of the temporomandibular joint (TMJ) is rare. Only 3 cases of simultaneous pigmented villonodular synovitis and synovial chondromatosis involving the TMJ have been reported.

Intra-articular adhesions of the temporomandibular joint: Relation between arthroscopic findings and clinical symptoms.

Background: Intra-articular adhesion (IA) is one of the important pathologic signs of intracapsular temporomandibular joint (TMJ) diseases, but this factor has been rarely described with respect to its arthroscopic characteristics and histology. The purpose of this study was to describe the incidence and distribution of IA in patients with internal derangement (ID) and to investigate the correlation between adhesions and the clinical symptoms of patients with ID of TMJ with closed-lock.

Methods: A retrospective analysis was conducted of 1822 TMJs with ID that were refractory to nonsurgical treatments and underwent arthroscopic surgery between May 2001 and June 2008 in our department.

Histologic study of adhesions in the upper joint compartment of the temporomandibular joint.

Purpose: The aim of this study was to observe the histologic characteristics of adhesions in the upper joint compartment of the temporomandibular joint and investigate the mechanism of genesis.

Patients And Methods: During arthroscopic surgery, we obtained 42 biopsy specimens of different grades of adhesions, ranging from grade I to grade IV, from 21 joints in 21 patients with internal derangement. Two biopsy specimens from each temporomandibular joint were obtained in this study; one was immediately fixed in 4% formalin and examined under a light microscope, and the other was fixed in 2% glutaraldehyde solution and examined under a transmission electron microscope.

A murine model for septic arthritis of the temporomandibular joint.

Purpose: This study was designed to establish a murine model of hematogenously acquired bacterial arthritis of the temporomandibular joint (TMJ) to investigate the pathogenesis of this rare TMJ infection.

Materials And Methods: One hundred forty mice were inoculated intravenously with 3 different staphylococcal suspensions. They were sacrificed at intervals between 1 day and 2 months.