Objective To evaluate the value of Materialise's interactive medical image control system (MIMICS) in the computer aided surgery, and to offer a reliable system for precise surgical planning and good effect of orthognathic surgery. Methods Based on CT images, geometric characteristics of 2 patients' head were collected for a 3D reconstruction of the human head. Skull, skin, and submucous tissue were reconstructed and optimized separately by MIMICS 10.01. Surgeries were simulated and the soft tissue deformation was predicted according to the surgical planning of experienced surgeons. Results Mesh of skull, skin and submucous tissue were constructed manually for 2 patients. Surgical procedures were simulated and the prediction of soft tissue deformation was realized by MIMICS, which could be visualized in any angle. Conclusion MIMICS is a helpful digital tool for computer aided surgery and the prediction of soft tissue deformation. MIMICS is also a 3D visualization system for orthognathic surgeries, by which surgeons could realize the surgical planning, revising,and the patient-doctor communication on the computer screen.

BACKGROUND:At present, studies on interpositional arthroplasty versus reconstruction arthroplasty for temporomandibular joint ankylosis remain scarce and controversial. OBJECTIVE:To systematical y review the efficacy of interpositional arthroplasty versus reconstruction arthroplasty in the treatment of temporomandibular joint ankylosis. METHODS:A computer-based online search was conducted in VIP, Wangfang, PubMed, Ovid, Embase, Clinical Evidence, Cochrance Library databases before December 2015 to compare the efficacy of interpositional arthroplasty versus reconstruction arthroplasty for temporomandibular joint ankylosis. Meta-analysis of maximal incisal opening and recurrence rate were performed using Stata13.1 software by extracting data from the relevant articles. RESULTS AND CONCLUSION:A total of 15 studies were included. Meta-analysis results of maximal incisal opening:the total combined result was MD=0.99,95%CI (-1.43, 3.40), Z=0.80, P=0.424, I2=73.9%, and the analysis results from temporomandibular myofascial flap group versus costochondral graft group showed that MD=0.84, 95%CI (-1.94, 3.63), Z=0.59, P=0.553, I2=82.2%;from the other material group MD=2.08, 95%CI (-3.03, 7.19), Z=0.80, P=0.426, I2=0.0%. The recurrence rate:OR=1.13, 95%CI (0.59, 2.15), Z=0.36, P=0.721, I2=0.0%. Egger test and Begg test showed that there were no publication biases in the literatures. The sensitivity test showed that the meta-analysis results were steady because no study influenced the total combined result in the Meta-analysis. These results indicate that interpositional arthroplasty exhibited similar efficacy as reconstruction arthroplasty in the treatment of temporomandibular joint ankylosis. This study was limited by a lack of high-quality studies.

Objective:To investigate the association of cognitive impairment plus poor oral health with mortality risk in older adults.Methods:This retrospective study included 3, 706 community-dwelling older adults enrolled in the National Health and Nutrition Examination Survey between January to June 2022, of whom 1, 973 were diagnosed with cognitive impairment and poor oral health.Based on cognitive performance and oral health status, 597 were categorized as having normal cognition and normal oral health, 506 as having normal cognition and poor oral health, 149 as having cognitive impairment and normal oral health and 226 as having cognitive impairment and poor oral health.The Cox proportional hazards regression model was used to test the effects of dental caries/periodontitis or edentulism and cognitive impairment on all-cause mortality and cardiometabolic mortality after adjusting for potential confounders.Results:During a median follow-up period of 13.4 years, 978(49.6%)patients died, with 264(13.5%)of cardiometabolic diseases). Cognitive impairment, periodontitis and tooth loss were all significant predictors of all-cause mortality.However, dental caries was not correlated with mortality.When these predictors were analyzed jointly, cognitive impairment and periodontitis were associated with an 83.1% increased risk of all-cause mortality and an 87.7% increased risk of cardiometabolic mortality compared with the healthy control group.The risk of all-cause mortality was highest in the presence of both cognitive impairment and tooth loss( HR=1.701, 95% CI: 1.338-2.161). Conclusions:In middle-aged and older individuals, the concomitant presence of cognitive impairment and periodontitis or edentulism may be associated with increased mortality.

BACKGROUND:Temporomandibular joint osteoarthritis can cause severe pain,which significantly affects the patient's quality of life and psychological health.Studies have found that medical ozone can effectively alleviate pain due to temporomandibular joint osteoarthritis,but its analgesic effect and mechanism are still unclear. OBJECTIVE:To explore the effects of medical ozone on pain relief in temporomandibular joint osteoarthritis and the potential mechanisms. METHODS:Twenty-four Sprague-Dawley rats were randomly divided into four groups(n=6 per group):control group,model group,air group,and medical ozone group.A sodium iodate-induced rat model of temporomandibular joint osteoarthritis was established in all groups except for the control group.After 1 week of modeling,rats in the air group and medical ozone group were injected with clean air and medical ozone,respectively,in the temporomandibular joint.The injection frequency for the air group and medical ozone group was once a week for three times in total.The von Frey mechanized pain measurement technique was used to assess the mechanical pain threshold of the temporomandibular joint in rats before and 28 days after modeling.ELISA was utilized to detect interleukin-1β in both serum and temporomandibular joint fluid at 28 days after modeling.Histopathologic changes of the temporomandibular joint were evaluated through hematoxylin-eosin staining.Additionally,the expression levels of hypoxia-inducible factor 1α and cyclooxygenase 2 in the temporomandibular joint were analyzed using immunohistochemistry. RESULTS AND CONCLUSION:Compared with the control group,the mechanical pain thresholds of the temporomandibular joint in the model group were decreased at 1,3,7,14,21,and 28 days after modeling(P<0.01);and compared with the model and air groups,the mechanical pain thresholds of the temporomandibular joint in the medical ozone group were increased at 28 days after modeling(P<0.01).Compared with the control group,the level of interleukin 1β in the serum and joint fluid of rats in the model group was elevated(P<0.01);compared with the model and air groups,the level of interleukin 1β in the serum and joint fluid of rats in the medical ozone group was decreased(P<0.01).Hematoxylin-eosin staining results showed derangement and degeneration of the cartilage structure in the model group and the air group,while the derangement of the cartilage structure in the medical ozone group was less than that in the model group and the air group.Immunohistochemical staining showed that the expression of hypoxia-inducible factor 1α and cyclooxygenase 2 in the temporomandibular joints of rats in the model group was elevated compared with that in the control group(P<0.01);the expression of hypoxia-inducible factor 1α and cyclooxygenase 2 in the temporomandibular joints of rats in the medical ozone group was decreased compared with that in the model group and the air group(P<0.01,P<0.05).These findings suggest that medical ozone can alleviate the pain caused by osteoarthritis of the temporomandibular joints in Sprague-Dawley rats by reducing the expression of hypoxia-inducible factor 1α,interleukin 1β,and cyclooxygenase 2.

BACKGROUND:It has been proved in clinical and animal experiments that intraarticular injection of medical ozone can effectively improve the symptoms of temporomandibular joint osteoarthritis and slow down the progression of the disease.However,the optimal concentration and range are still controversial. OBJECTIVE:To analyze the effects of intraarticular injection of different concentrations of medical ozone on the condylar cartilage of rats with temporomandibular joint osteoarthritis. METHODS:Of the 42 rats,6 rats were randomly selected as the healthy control group,and the remaining rats were given one-time injection of sodium iodoacetate into the joint cavity to establish the temporomandibular joint osteoarthritis model.Of the 36 rats successfully modeled,6 rats were selected as the model control group,and the remaining 30 were randomly divided into 20,30,40 mg/L medical ozone groups,with 10 rats in each group.After successful modeling,the rats in the medical ozone groups were given intra-articular injection of 20,30,40 mg/L medical ozone oxygen once a week for 3 weeks,respectively,and the model and healthy control groups were injected with equal volume of saline.One week after the final injection,unilateral temporomandibular joint tissues were taken,and the level of vascular endothelial growth factor in condylar cartilage was measured by ELISA.Hematoxylin-eosin staining and saffron O-fast green staining were performed on the contralateral temporomandibular joint tissues.The modified Mankin's score was applied to evaluate the degree of histopathological changes in the temporomandibular joint. RESULTS AND CONCLUSION:Compared with the healthy control group,the vascular endothelial growth factor level in the condylar cartilage of rats was significantly increased in the model control and 20,30,40 mg/L medical ozone groups(P＜0.05).Compared with the model control group and 40 mg/L medical ozone group,the vascular endothelial growth factor level in the condylar cartilage of rats was significantly decreased in the 20 and 30 mg/L medical ozone groups(P＜0.05).Compared with the 30 mg/L medical ozone group,the vascular endothelial growth factor level in the condylar cartilage of rats was significantly decreased in the 20 mg/L medical ozone group(P＜0.05).Histological observations showed that the modified Mankin's scores in the 20,30,and 40 mg/L medical ozone groups and the model control group were higher than those in the healthy control group(P＜0.05),while the modified Mankin's scores in the 20 and 30 mg/L medical ozone groups were lower than those in the model control group and the 40 mg/L medical ozone group(P＜0.05).To conclude,intraarticular injection of medical ozone at mass concentrations of 20 and 30 mg/L significantly alleviated the progression of osteoarthritis of the temporomandibular joint in rats,especially when 20 mg/L medical ozone was injected.However,the degree of osteoarthritis in the temporomandibular joint of rats was aggravated when the mass concentration of ozone increased to 40 mg/L.