Publications by authors named "Ji-Si Zheng"
Changes of the condylar position after modified disk repositioning: A retrospective study based on magnetic resonance imaging.
Oral Surg Oral Med Oral Pathol Oral Radiol
January 2020
Objective: This study aimed to explain the malocclusion resulting from the changes in condylar position after unilateral open disk repositioning surgery.
Study Design: Patients treated with unilaterally modified temporomandibular joint disk repositioning were reviewed. All patients underwent magnetic resonance imaging (MRI) before and immediately after surgery.
Article Synopsis
- A new TMJ prosthesis designed specifically for the Chinese population is being developed due to the lack of suitable options available commercially.
- Patients with severe TMJ osteoarthrosis underwent surgery between Nov 2016 and Mar 2017, receiving a 3D-printed, customized prosthesis comprising three parts tailored to their unique anatomy.
- Post-surgery results showed no complications, and notable improvements in pain, dietary intake, and jaw function, although some limitations in lateral movement and deviation of the jaw were observed.
To guide barrier membrane choice in the treatment of peri-implant alveolar bone defects, we evaluated guided bone regeneration (GBR) using titanium (Ti) mesh or Bio-Gide membrane, independently or in combination, for repair of alveolar bone defects in Beagle dogs. Six months after extraction of the mandibular premolars and first molars from three beagle dogs, we inserted implants assigned into 3 groups and covered with the following membrane combinations: Group A: Implant + Bio-Oss + Ti-mesh, Group B: Implant + Bio-Oss + Bio-Gide, and Group C: Implant + Bio-Oss + Ti-mesh + Bio-Gide. At 6 months, micro-CT revealed that bone volume/total volume (BV/TV), trabecular number (Tb.
View Article and Find Full Text PDFPurpose: We sought to introduce our classification and reconstruction protocol for skull base erosions in the temporomandibular joint and skull base region.
Patients And Methods: Patients with neoplasms in the temporomandibular joint and skull base region treated from January 2006 to March 2017 were reviewed. Skull base erosion was classified into 3 types according to the size of the defect.
To evaluate the displacement of the disc of the temporomandibular joint (TMJ) in different types of condylar fracture we studied 160 patients (222 joints) from May 2009-June 2014. All patients had computed tomographic scans (CT) and magnetic resonance images (MRI) taken preoperatively, and 24 patients (32 joints) had MRI postoperatively. CT scans were reviewed to categorise the types of condylar fracture (intracapsular, condylar neck, and subcondylar), and intracapsular condylar fractures were further classified into subtypes A, B, C, and M.
View Article and Find Full Text PDFIt is unclear whether vascular endothelial growth factor (VEGF) can initiate osteoarthritis (OA) in the temporomandibular joint (TMJ). In this study we evaluated the effects of intra-articular injection of exogenous VEGF in the TMJ in mice on the early stage. Forty-eight male Sprague-Dawley mice were equally divided into 3 groups.
View Article and Find Full Text PDFArticle Synopsis
- The study evaluates three modified techniques for total alloplastic temporomandibular joint replacement (TMJ TJR) focusing on prosthesis stability and bone growth issues.
- It involves 15 patients (19 joints) treated with the Biomet stock prosthesis, using modifications like bone grafting and salvaging TMJ discs.
- Results showed high integration of grafted bone and post-surgery stability, with reduced complications such as bleeding and heterotopic bone formation, indicating the techniques' effectiveness.
Article Synopsis
- * Twelve surgeries were performed on six Beagles, assessing safety (like sinus membrane perforation and nasal bleeding) and effectiveness (intraoperative height, bone graft volume, and graft dislocation).
- * Results showed that the endoscopic method resulted in higher intraoperative heights (13.7 mm vs. 9.1 mm) and larger bone graft volumes (0.9 ml vs. 0.5 ml) compared to the control, indicating it is a safe and effective operation.
Systematic modification and evaluation of a canine model for elevation of the floor of the maxillary sinus.
Br J Oral Maxillofac Surg
November 2014
Article Synopsis
- Researchers developed a new surgical method using a canine model to raise the floor of the maxillary sinus, with evaluations conducted through CT scans and endoscopy.
- Preoperative CT scans were performed on both cadaver and live beagles to choose the optimal surgical incision site, located between specific teeth.
- The results indicated that the candidate surgical site was effective, with endoscopic observations confirming the condition of the surrounding membrane, making this model appropriate for further research on sinus floor elevation techniques.