This paper introduces the individual design of oral radiotherapy stent based on 3D printing technology, and expounds its design principle. The modeling of the device is based on CT images and Mimics software, which builds a set of 3D printing oral stent technology. The instrument has more advantage in high precision, fast modeling, individualized production and digital storage. The results show that the construction of 3D printed dental stent is feasible, which provides a new idea and method for the production of oral stents.

BACKGROUND:Artificial knee joint replacement is the main surgical method for the treatment of severe knee joint deformation, but due to the limited existing knee prosthesis type. The stature of Fujian population in southeast China was shorter than that of the north. The size of artificial knee joint usual y did not fit for patients in clinic. The substitution effect was poor.
OBJECTIVE:To measure the geometric parameters of proximal surface and cross-section of adult female tibia in southeastern area of Fujian Province of China, and provide basic data for design and replacement of artificial knee joint in females.
METHODS:We chose 85 cases of dry female skeleton in southeastern area of Fujian Province of China, measured tibial plateau width, medial tibial plateau width and anteroposterior diameter, lateral tibial plateau width and anteroposterior diameter. We col ected clinical normal proximal tibial CT data of 36 patients (38-65 years old), with scan range of 30 cm (intercondylar eminence 30 cm) and layer thickness of 0.625 mm. Mimics 16.0 three-dimensional reconstruction software was used to measure above indexes and cut the reconstructed models with thickness of 3 mm, total y 10 layers. We divided its widest distance into four equal parts, and measured tibial anteroposterior diameter on three points. Statistical software was used to analyze the linear relationship between the data.
RESULTS AND CONCLUSION:The experiment has successful y obtained geometric parameters of tibial specimens of adult females in southeastern area of Fujian province of China. Tibia platform inside and outside diameters were greater than the width inside and outside;inside and outside diameter and inside and outside width were similar. Ten segment planes of tibia, inside and outside diameters were always less than middle anteroposterior diameter. Three groups of data increased firstly, and then reduced. There were positive correlations between tibia length and width of the medial tibia platform, the lateral tibia platform width and anteroposterior diameter, the medial tibia platform width and anteroposterior diameter, and the lateral tibia platform width and anteroposterior diameter (P<0.05). These results suggested that relevant parameters of tibial plateau adult women in southeastern area of Fujian province of China showed some regular changes. Our results may provide quantitative reference data for the design and operation of artificial tibial plateau.

Tumor radiation therapy (RT)can affect the immune system.Latest studies show that appropriate RT can activate the immune system through regulating tumor microenvironment,activating immune cells and releasing danger signals,and can produce bystander or abscopal effect.With the development of clini-cal biomarkers research and clinical trials about RT combined with immunotherapy,it is expected to change the traditional pattern of tumor treatment.

The purpose of this study was to compare the pharmacokinetic profiles of tetramethylpyrazine phosphate (TMPP) in plasma and extracellular fluid of the cerebral cortex of rats via three delivery routes: intranasal (i.n.), intragastric (i.g.) and intravenous (i.v.) administration. After i.n., i.g. and i.v. administration of a single-dose at 10 mg/kg, cerebral cortex dialysates and plasma samples drawn from the carotid artery were collected at timed intervals. The concentration of TMPP in the samples was analyzed by HPLC. The area under the concentration-time curve (AUC) and the ratio of the AUCbrain to the AUCplasma (drug targeting efficiency, DTE) was calculated to evaluate the brain targeting efficiency of the drug via these different routes of administration. After i.n. administration, TMPP was rapidly absorbed to reach its peak plasma concentration within 5 min and showed a delayed uptake into cerebral cortex (t max=15 min). The ratio of the AUCbrain dialysates value between i.n. route and i.v. injection was 0.68, which was greater than that obtained after i.g. administration (0.43). The systemic bioavailability obtained with i.n. administration was greater than that obtained by the i.g. route (86.33% vs. 50.39%), whereas the DTE of the nasal route was 78.89%, close to that of oral administration (85.69%). These results indicate that TMPP is rapidly absorbed from the nasal mucosa into the systemic circulation, and then crosses the blood-brain barrier (BBB) to reach the cerebral cortex. Intranasal administration of TMPP could be a promising alternative to intravenous and oral approaches.

Objective To study the effect of the serum testosterone/estradiol ratio (T/E2) alteration on sperm defect and fertility. Methods The testosterone, estradiol, FSH, LH, PRL,sperm parameters and sperm morphology of 90 men were analyzed and the T/E2 and multiple anomalies index (MAI) were calculated. The patients were divided into 3 groups; T/E2≤10 (Ⅰ), T/E2＞10 (Ⅱ), and T/E2＞20 (Ⅲ). Results The sperm concentration and motility among the 3 groups were not significantly different (P＞0. 05). The percentages of the sperm whose head, neck and tail were abnormal declined gradually with the increase of the T/E2 in serum. The percentage of sperm head defeet of group Ⅰ was significantly higher than that of group Ⅲ (t=2. 482, P=0. 016) and that of sperm neck defect of groups Ⅰ and Ⅱ were significantly higher than that of group Ⅲ (t=4.113, 2. 050, P=0.000, 0. 046, respectively). The percentage of sperm tail defect among 3 groups was significantly different (t=2. 722, 3. 996, 3. 110, P=0. 008, 0. 000, 0. 003, respectively). The SDI of group Ⅱ was significantly higher than that of group Ⅰ (t= -2. 293, P= 0. 025). But the TZI increased gradually with the increase of the serum T/E2 and the TZI of groups Ⅱ and Ⅲ were significantly higher than that of group Ⅰ (t=2. 285, 2. 727, P=0. 025, 0. 009, respectively). The percentage of the men in group Ⅰ whose partners became pregnant was 29. 5% and those of groups Ⅱ and Ⅲ were 50% and 42.9%, respectively. Although the percentage among three groups was not different statistically (x2 = 3. 285, 0. 854, 0. 199, P= 0. 070, 0. 355, 0. 655, respectively), the relative risks of groups Ⅱ and Ⅲ were 2.4 and 1.8 times of that of group Ⅰ. There were 25, 15, 7 cases of idiopathic infertility among the 3 groups, respectively. The relative risk of I group was 1.5 and 1.3 times of that of Ⅱ and Ⅲ groups. The correlation analysis showed that the T/E2 in serum had significantly negative correlation with the percent of the sperm head or neck or tail defects (r= -0. 209, -0. 316 and -0. 335,respectively and P= 0. 048, 0. 002 and 0. 001, respectively). Conclusions The decrease of T/E2 in serum was correlative with the decrease of fertility probability, but it did not alter the sperm density and the sperm motility. It showed that the level of the T/E2 in serum was important for spermatogenesis and sperm fertilizing capability.

Objective:To explore the putative role of CD40 and COX-2 expression in human esophageal squamous cell carcinoma(ESCC)and to analyze their possible relationship with angiogenesis in ESCC.Methods:The expression of CD40 and COX-2 was detected in 79 ESCC and 28 normal esophageal epithelial tissue samples with immunohistochemical staining.The microvessel density by CD34 was determined and the clinicopathological significance of CD40 and COX-2 expression in ESCC was analyzed.In addition,the expression of CD40 and COX-2 in esophageal squamous cell carcinoma cell line Eca109 and primary cultured normal esophageal epithelial cells in vivo was comparatively studied with immunocytochemical staining andWestern blot.Results:Compared with that in normal epithelial tissues,the expression of CD40 and COX-2 in ESCC was significantly higher(54.43%vs 10.71%:69.62%vs 17.86%:respectively,P<0.05).The positive expression rate of CD40 in ESCC cases with lymph node metastasis was significantly higher than that in those without lymph node metastasis(70.37%vs 46.1 5%.P<0.05).No correlation was found between CD40 expression and patient age,sex,tumor location,size and differentiation of tumors.No clinicopathological significanca of COX-2 expression in ESCC was found.There was a positive correlation between CD40 expression and COX-2 expression in esophageal squamous cell carcinoma(P<0.05,φ=0.446).The mean MVD value in ESCC was significantly higher than that in normal esophageal tissue(25.02±5.52 vs 12.09±4.55,P<0.05).MVD value in ESCC was closely correlated with lymph node metastasis.The mean MVD value in ESCC cases with positive CD40 and COX-2 expression was higher than that in those with negative CD40 and COX-2expression(26.37±6.02 vs 22.58±5.25.P<0.05).Western blot results showed that CD40 and COX-2 expression in Eca109 was higher than that in cultured normal esophageal epithelial cells (P<0.05).Conclusion:The expression of CD40 is involved in the carcinogenesis and progression of esophageal squamous cell carcinoma.CD40 may play an important role in the angiogenesis of ESCC through promoting COX-2 expression.