Journal of Orthodontics & Endodontics

Description

Bone Chips Additionally, excessive blood loss during orthognathic surgery has been reported, despite its rarity. Operating time, gender, weight, body mass index (BMI), surgeon experience, and surgical procedure have all been the focus of some investigations into the factors that influence intraoperative blood loss. The buccal cortical bone and inner cancellous bone are separated during BSSO, revealing the mandible's bone marrow space. A previous study indicated that BSSO was associated with a greater risk of neurosensory disturbance with a smaller bone marrow space. However, it is unknown whether the mandible's bone marrow space volume influences blood loss during BSSO. During BSSO, we hypothesized that blood loss would be influenced by the mandible's bone marrow volume. As a result, the purpose of this study was to examine CT images to test this hypothesis. After orthognathic surgery, relapses of less than 2 millimeters have a particularly negative impact on orthodontic treatment.

Lateral Cephalometric Radiographs

Retrospective reviews of surgical patients were conducted, and factors contributing to relapse were investigated. Between January 2016 and December 2017, 130 patients at our hospital underwent bilateral sagittal split ramus osteotomies. The positions of the maxilla and mandible (SNA, SNB), mandibular changes caused by surgery (Point B (X, Y), Argo-FH, mandibular plane), hyoid position (MP-H), head position (NSL/CVT, SN-C2C4), and airway space (SPAS, MAS, and IAS) were measured on lateral cephalometric radiographs taken prior to surgery (T1),The change in Point B (X) between T3 and T2 was calculated, postoperative changes (T2–T1) and postoperative stability (T3–T2) were evaluated, and patients with a change of less than 2 millimeters (Group S) were compared to those with a change of less than 2 millimeters (Group R).For the purpose of statistical analysis, an unpaired t-test (p  0.05) was used. For 42 patients, complete sets of radiographs were obtained. Group S (n = 33) and Group R (n = 9) did not differ significantly in either SNB or Point B (X), but they did differ significantly in MP-H, NSL/CVT, and SN-C2C4 (p  0.05). These findings demonstrated that regardless of the degree of mandibular setback, postoperative mandibular relapse of 2 mm occurred, and that it was more likely to occur when surgery had resulted in a greater change in hyoid position. DWI, or diffusion-weighted imaging, is a method that looks at how the water proton moves within the tissue. The apparent diffusion coefficient of bone marrow in musculoskeletal lesions has been the subject of research. The correlation between healthy patient mandibular cortical width (MCW) and the ADC of bone marrow in the mandible were examined in this study. Retrospective cohort research was used in this study. Between April 2020 and October 2020, the patient underwent panoramic X-rays and echo planar (EPI)-DWI at the Nihon University School of Dentistry. Mean MCW was the predictor variable. The mean ADC of the mandibular bone marrow was the primary outcome variable. Age was the additional factor. Spearman's correlation coefficient and the Mann-Whitney U test were utilized for data analysis. The significance level was set at p 0.05. The records of 18 men (mean age 44.94, range 20–73 years) and 40 women (mean age 47.98, range 21–78 years) were analyzed. Mean ADC value and mean MCW did not differ significantly by sex (p = 0.853 and p = 0.43, respectively).MCW and the ADC of the mandibular bone marrow showed a strong positive correlation (r =.493, p 0.001) This suggests that measuring the ADC of bone marrow in the mandible, in addition to the MCW, which is currently utilized for the evaluation of bone quality, could contribute to the investigation of bone quality and diseases. It has been reported that ultrasonic osteotomy devices (UODs) have numerous clinical advantages; For instance, in oral surgery, they do little damage to surrounding tissues. However, it is still unclear how the process of tissue repair differs between UODs and rotary osteotomy devices (RODs). In a rat calvarial defect model, the aim of this study was to compare UOD and ROD bone healing following osteotomy.

Ultrasonic Microvibration

Male Wistar rats developed calvarial bone defects with a UOD on the right side and a ROD on the left. Micro-CT, light microscopy, and electron microscopy were used to quantitatively examine the morphological and bone changes over the course of four weeks. In addition, osteoblastic cells from the bone chips were taken after the calvarial bone osteotomy, cultured for two weeks, and their proliferation and differentiation activities were examined. SEM revealed that the surfaces of UOD cuts were smoother than those of ROD cuts. The bone wound gap closed earlier on the UOD side in HE-stained sections and micro-CT images than on the ROD side. On the UOD side, there was more bone thickness, more newly formed bone, and more osteocytes than on the ROD side. The proliferative activity of cultured osteoblast-like cells taken from UOD-cut bone chips was higher than that of ROD-cut bone chips. Because ultrasonic microvibration activates osteoblasts differentiated from mesenchymal cells and because UODs cause less damage to the bone than conventional RODs, the use of a UOD may aid in the regeneration of bone. Bilateral maxillary sinus lifts were performed on adult, healthy male and female patients. Eligible for inclusion were only patients who presented with maxillary sinus pneumatization and had a residual bone height of less than 7 mm on tomography. DFDBA or FFB was grafted on each side at random. A 2 mm short trephine drill was used to obtain 10 mm-long bone core biopsies six to nine months after grafting at the time of dental implant installation. The bone biopsies were fixed in buffered formalin and subjected to microcomputed tomography and histomorphological analysis at random and in complete anonymity. Resonance frequency equipment was used to measure implant stability at three different points in time: immediately, six months, and one year after dental implant placement.