Clinical Protocols ; Computer-Aided Design ; Humans ; Mandibular Reconstruction ; User-Computer Interface

BACKGROUND:Currently, bioactive glass and polylactic acid have been used in clinical dentistry and plastic surgery; however, their therapeutic outcomes are not satisfactory, because the material properties have some limitations. OBJECTIVE:To explore the cytocompatibility of oxygen plasma-treated polylactic acid and bioactive glass guided bone regeneration membrane. METHODS:Bioactive glass and polylactic acid were used as the basic materials to prepare polylactic acid membrane, polylactic acid and bioactive glass composite membrane and oxygen plasme-treated polylactic acid and bioactive glass composite membrane, al of which were used to culture MG63 cels. Cel adhesion rate, cel proliferation rate and alkaline phosphatase activity of MG63 cels on these three kinds of membranes were observed. RESULTS AND CONCLUSION: With the growth of time, in these three groups of membranes, the cel adhesion rate and cel proliferation rate were al significantly increased. Alkaline phosphatase activity showed a decreasing trend after the first increase, and reached its peak at the 7thday of culture. The cel adhesion rate and cel proliferation rate in oxygen plasma-treated polylactic acid and bioactive glass group were significantly higher than those in the other two groups, while the cel adhesion and proliferation rates in polylactic acid and polylactic acid and bioactive glass groups were similar. At the 3rd day of culture, the alkaline phosphatase activity in the polylactic acid and bioactive glass group and oxygen plasma-treated polylactic acid and bioactive glass group was significantly higher than that in the polylactic acid group. At the 7th and 14th days, there was no significant difference in the alkaline phosphatase activity among these three groups. These results show that oxygen plasma-treated polylactic acid and bioactive glass composite membrane has good biocompatibility, which can better promote cel adhesion, proliferation and matrix secretion from osteogenic cels.

Neonatal nerves exist in tumor tissues,and tumor cells can invade nerve by neurogenesis.Current research shows that cancer cells can secrete cytokines to promote the differentiation and growth of nerve cells,in turn,the differentiation and growth of nerve cells can stimulate tumor development and metastasis.Neurogenesis is one way of interaction bettween tumor cells and microenvironment similar to angiogenesis and lymphangiogcnesis,which has a major impact on biological behavior of tumor cells and prognosis.

Objective To observe the expression of breast cancer resistance protein(BCRP) gene in breast cancer patients,and to explore its value in evaluating the therapeutic effect of chemotherapy for breast cancer.Methods Semi-quantitative reverse-transcription polymerase chain reaction(RT-PCR) was applied for the detection of mammary BCRP gene expression level in 60 female breast cancer patients who have received chemical therapeutic regimen of CEF(cyclophosphamide,epirubicin and 5-fluorouracil).The patients were divided into two groups according to the BCRP gene expression before CEF therapy.After treatment,the therapeutic effect in the two groups was observed and the BCRP gene expression level was also measured.Results In 17(17/60,28.3%) patients with positive BCRP gene expression,11 were relieved,with a relief rate of 64.7%,lower than 93.0% in patients with negative BCRP gene expression(P

[Objective]To retrieval a best cell factor which can induce bone marrow stromal cells (bMSCs) into chondrocyte in vitro and to explore an effective plan to repair rabbit's chondrocyte defect.[Method]Isolated bMSCs were cultured in vitro. rh Fibroblast Growth Factor 1(rhFGF-1)、rh Transforming Growth Factor-?1(rhTGF-?1)、rh Insulinlike Growth Factor-Ⅰ(rhTGF-Ⅰ) were utilizated. The proliferation of cells was detected by MTT assay, and the macroscopic histology , HE staining and immunohistochemical examinations were performed to seek the best cell factor. In vivo , to investigate the repair of the articular cartilage, bMSCs combined with fibrin glue and rhTGF-?1、rhIGF-I was compared with control group.[Result]The cells induced by rhTGF-?1 and rhIGF-I were similar to chondrocytes in morphology, and immunohistochemical examinations showed the cells possessed phenotype of chondrocytes. RhTGF-?1 and rhIGF-I could differentiate bone marrow stromal cells into cartilage cells in vivo, and repair the articular cartilage defect. The control group could not repair the articular cartilage defect efficiently.[Conclusion]rhTGF-?1 and rhIGF-I are best group which stimulate bMSCs to differenate into cartilage cells. BMSCs combined with fibrin glue and rhTGF-?1、rhIGF-I can repair the articular cartilage defect.

[Objective]To study the effects of Cable-Pin system used as a treatment alternative for patellar fractures.[Method]Thirty-five cases of patellar fracture were operated with the Cable-Pin system from October 2005 to May 2007.Their diagnosis were 19 transverse close ractures and 16 comminuted of patella.There were 21 males and 14 females.Their ages ranged from 21 to 75 years old.After open reduction,the author used a drill bit vertically through the patella in a superior direction,drilled the threaded portion of the pin across the fracture site,inserted a second Cable Pin through the second hole in a similar manner.A horizontally directed drill hole anterior to the pins was created in the superior pole of the patella.The two cables were crossed in a fighre eight over the an-terior surface of the patella.The Crimper Tensioning Handle was,the cable carefully,the handles of the crimper were squeezed until the crimp was fully crimped.[Result]The 35 patients were followed up for 12 to 18 months(mean 13.2 m).Fractures healed in all the cases without such complications as loosening of screw and cable loop,loss of reduction or irritation to soft tissue.Restoration of the knee joint motion was excellent in 32 cases and good in 3 cases according to Bostman score system.[Conclusion]Cable-Pin system as a new option for the treatment of patella fracture,can result in reliable fixation and low rate of complications.

6 months (n=12), control group, without AF (n=8). Atrial muscle samples of the left and right atrial appendage were cut off during heart valve replacement. Expressions of Cx40 and Cx43 were detected by immunoblotting and immunohistologic analyses. Results ①No obvious change of Cx43 and Cx40 in the left and right atrium of each patient in each group was measured. ②Compared with that in the control group, the level of Cx40 was decreased signficantly in GroupⅠ (P

6 months; Control group (n=8) without AF. Atrial muscle samples of the left and right atrial appendage were cut off during heart valve replacement. Morphological changes were observed by light microscopy and electron microscopy. Results ① The incidence rates of Aschoff body were 37.5% (3/8), 46% (5/11) , and 50% (6/12) in Group Ⅰ, Group Ⅱ, and the control group. There was no difference in Aschoff body between the left and right atrial myocytes. ② There was no difference in myocytic degeneration, interstitial hyperplasia, and lymphocytes infiltration between the left and right atrial myocytes in each group. ③ Myolysis, accumulation of glycogen, and fibrosis were detected by electron microscopy in the 3 groups. Changes of myolysis and fibrosis were more obvious in patients with AF than patients without AF. Conclusion There are similar pathological changes in the left and right atria in rheumatic heart disease patients with or without AF. Fibrosis of atrial myocytes may be involved in the occurrence and maintenance of AF.

The mesially impacted of mandibular second molar is one kind of common malocclusion in clinic.It can lead to damages to stomatognathic system.The looped uprightor is an effective tool in the treatment of this kind of malocclusion.