Reform of practical teaching was performed by school of stomatoly in Shandong university.Lab teaching,training and evaluation on head simulator were strengthened.The psychological and technical transformation from students to dentists was accelerated through technical training before clinical practice.Comprehensive clinical practice strengthened clinical skill training and improved comprehensive ability cultivation.Three sections of practical teaching including lab teaching,technical training before clinical practice and comprehensive clinical practice were organically combined and a complete practical teaching platform was constructed,which provides guarantees for the improvement of clinical practical ability of undergraduates in stomatology.

OBJECTIVETo investigate the expression of chemokine stromal cell-derived factor-1 (SDF-1) receptor CXCR4 in human gingival mesenchymal stem cells (GMSCs) and the migration potential of GMSCs stimulated with SDF-1.

METHODSHuman GMSCs were isolated by single-cell cloning method. Their cell surface markers were characterized by flow cytometry, and the rate of colony formation was evaluated. Differentiation assay was used to detect the differentiation potential of GMSCs. The expression of chemokine SDF-l receptor CXCR4 in GMSCs was detected by immunocytochemical staining. The chemotactic effect of SDF-1 on GMSCs was detected using a 24-multiwell Transwell cell culture chamber. The number of net migrated cells was counted in different microscope fields.

RESULTSHuman GMSCs possessed high self-renewal potential and formed single-cell colonies cultured in vitro. GMSCs expressed mesenchymal stem cells-associated markers CD44, CD73, CD90, CD105, and CD166, and the expression of hemopoietic stem cell surface markers CD14, CD34, and CD45 was negative. GMSCs differentiated into osteoblasts and adipocytes under defined culture conditions. The colony forming unit-fibroblastic for GMSCs was 21.4%/±2.8%. Immunocytochemical staining demonstrated that GMSCs expressed chemokine SDF-1 receptor CXCR4. The number of GMSCs migrating at concentrations of 100 ng.mL-1 and 200 ng.mL-1 of SDF-l in the Transwell cell culture chamber was significantly higher than that of the negative control (189.3±4.4, 164.6±4.9 cells/field vs. 47.8±2.5 cells/field, P<0.01). Treatment with the CXCR4 neutralizing antibody, an antagonist for CXCR4, significantly reduced the migratory effect compared with the negative controls (29.0±2.4 cells/field vs. 47.8±2.5 cells/field, P<0.01).

CONCLUSIONHuman GMSCs express chemokine SDF-l receptor CXCR4. SDF-1 may participate in regulating chemotaxis of human GMSCs. Results suggest that the migration induced by SDF-1 is mediated by CXCR4.

Adipocytes ; Cell Culture Techniques ; Cell Differentiation ; Chemokine CXCL12 ; metabolism ; Chemotaxis ; Flow Cytometry ; Gingiva ; physiology ; Humans ; Mesenchymal Stromal Cells ; physiology ; Osteoblasts ; Receptors, CXCR4 ; Signal Transduction

0.05), but they did at 48 h(P

Objective:To study the effects of IGF-1 on the proliferation,total protein amount and cytodifferentiation of mouse dental follicle cells.Methods:The dental follicle cells of passage 3 were incubated with different concentrations((0.005),0.01,0.05,0.1 and 0.5 mg/L)of IGF-1 respectively,cell proliferation,alkaline phosphatase(ALP),total protein amount were measured by MTT assay and spectrophotometer respectively.Effects of 0.05 and 0.1 mg/L IGF-1 on mineralization potential were studied by Von Kossa staining.Results:IGF-1(ml/L) at 0.005~0.1 increased the proliferation and total protein amount(P

Objective To explore the relationship between the single nucleotide polymorphisms(SNPs) of IVS13-98G/T of human protection of telomeres 1(hPOT1) genes and H.pylori infection.Methods A total of 150 cases of gastric carcinoma and 156 cancer-free controls were genotyped by polymerase chain reaction(PCR) and PCR-restriction fragment length polymorphism(PCR-RFLP) method.H.pylori was identified with PCR and Warthin-Starry methods.Results The frequencies of GG,GT,and TT genotypes of hPOT1IVS13-98 G/T were 22.00%,41.67% and 36.67% in patients and 24.36%,51.92%,and 23.72% in controls,respectively.The OR for any GT and GG genotype was 0.432(95% CI: 0.242-0.772,P=0.005) and 0.540(95% CI: 0.274-1.064,P=0.075) when compared with TT genotype,respectively.There were no differences in genotype distribution and allele frequency of IVS13-98 G/T polymorphism(?2=3.0257,P= 0.0820).hPOT1IVS13-98 G/T polymorphism was not correlated with H.pylori infection in gastric cancer.Conclusion Our results indicated that IVS13-98 G/T SNP of hPOT1 gene might be associated with reduced risk for gastric carcinoma,but not with H.pylori infection.

OBJECTIVEThis study aimed at investigating effects of exogenous interleukine-10 (IL-10) on IL-6 and intercellular adhesion molecular (ICAM-1) expression in inflamed gingival tissue.

METHODSThe expression of IL-6 and ICAM-1 was examined using immunohistochemical techniques. Inflammatory gingival tissue treated with IL-10 was taken as the experimental group and the same patient's inflammatory gingival tissue without treatment of IL-10 was included into the control group.

RESULTSIL-6 expression was found mainly in monocytes, macrophages, lymphocytes, endotheliocytes and fibroblasts. The expression of ICAM-1 was found mainly in epithelial cells, monocot-macrophages, lymphocytes, endotheliocytes and fibroblasts. The immunohistochemical optical density (IOD) of the expression of IL-6 and ICAM-1 was detected by using Image-Proplus software, and the results showed that the expression in the experimental group differed significantly from that in the control group.

CONCLUSIONThe exogenous IL-10 may down-regulate IL-6 and ICAM-1 expression in inflammatory gingival tissue.

Adult ; Down-Regulation ; Female ; Gingiva ; metabolism ; Gingivitis ; metabolism ; Humans ; Intercellular Adhesion Molecule-1 ; biosynthesis ; genetics ; Interleukin-10 ; pharmacology ; Interleukin-6 ; biosynthesis ; genetics ; Male ; Middle Aged

Objective:To investigate the influence of chemotherapy on the phenotype of secreted protein, acidic and rich in cysteine (SPARC) in gastric cancer (GC). Methods:Immunohistochemistry was used to analyze SPARC expression in 132 GC patients. Among these patients, 54 with preoperative chemotherapy and 78 without preoperative chemotherapy were selected to analyze the effect of chemotherapy on SPARC phenotype by comparing the postoperative specimens of the two cohorts. Results:SPARC expression was higher in GC lesions than in the desmoplastic stroma surrounding the tumor cells and noncancerous tissues. High SPARC expression was related to invasion depth, lymph node metastasis, and TNM staging. SPARC expression was lower in patients with preoperative chemotherapy than in controls ( P<0.05). Gross type, histology, depth of invasion, lymph node metastasis, TNM staging, and SPARC phenotype correlated with the overall survival of the patients with preoperative chemotherapy. Further multivariate analysis suggested that lymph node metastasis, histology, and SPARC phenotype after chemotherapy were independent prognostic indicators of GC. Conclusion:SPARC expression was associated with invasion depth, lymph node metastasis, TNM staging and GC prognosis. Preoperative chemotherapy may change the phenotype of SPARC in GC patients.

Objective To investigate the effect of voice training therapy on the voice improvement in patients with vocal nodules .Methods Twenty one patients with vocal nodules were recruited and were evaluated by the GRBAS perpetual evaluation ,voice handicap index (VHI)-30 subjective assessment ,vocal laryngostroboscopy , maximum phonation time (MPT) and acoustic analysis pre- and post-therapy .These patients completed 5 cour‐ses of voice training .Results The VHI value(29 .48 ± 21 .21) of post-therapy was less than the value (52 .95 ± 24 . 30)of pre -therapy (P< 0 .01) .There were significantly differences in voice perpetual evaluation between pre -training and post-training ,especially for G (grade) (P<0 .01) and R (roughness) (P<0 .01) .The post-training laryngostrobescopy vocal vibration improved comparing with pre-therapy in the closure of vocal cords ,symmetry of vibration ,the mucosal wave and vibration regularity of the vocal cords .After therapy ,three patient nodules dis‐appeared ,thirteen patient nodules became smaller ,and five patient nodules remained the same .The maximum pho‐nation time (MPT) (12 .54 ± 3 .68)of post-therapy was longer than MPT(8 .87 ± 3 .75) of pre-therapy MPT(P<0 .01) .The jitter value (0 .18% ± 0 .08% ) of post -therapy was less than that of pre-therapy(0 .43% ± 0 .31% ) (P<0 .01) .The shimmer of post -therapy (2 .10% ± 0 .98% ) was less than that of pre -therapy (4 .55% ± 1 .80% )(P<0 .01) ,The ratio of noise to harmonic(NHR)(0 .0034 ± 0 .0022 dB) of post-therapy was significantly less than NHR(0 .0184 ± 0 .028 dB)(P<0 .05) of pre-therapy .Conclusion The voice therapy could significantlyimprove voice of patients with vocal nodules .

Objective To investigate the expression of the mRNA of muscle fibre types in the denervated post cricoarytenoid(PCA)muscle of rat.Methods Unilateral recurrent laryngeal nerve of eight rats were removed.Eight rats were used as controls.The mRNA expression of heavy chain myosin of PCA muscle fibre subtypes was measured with real-time quantitative RT-PCR in control rats and denervated rats 40 days after denervation.Results Compared to the control group,there were no significantly differences in mRNA expression of each muscle subtype between two groups.The ratio of MyHC type I to IIB was increased significantly(P=0.018).Conclusion The increased ratio of MyHC subtype I to IIB suggests the decreased contraction power of denervated PCA muscle.

OBJECTIVE: To investigate the characteristics of adductor spasmodic dysphonia phonatory break in mandarin Chinese and select the stimuli phrases. METHOD: Thirty-eight patients with adductor spasmodic dysphonia were involved in this study. Standard phrase " fù mŭ xīn" and a speech corpus in mandarin Chinese with 229 syllables covering all vowel and constant of mandarin Chinese were selected. Every patient read the phrases above twice in normal speed and comfortable voice. Two auditory perpetual speech pathologists marked phonatory break syllables respectively. The frequency of phonatory break syllables and their located phrases were calculated, rated and described. The phrases including the most phonatory break syllables were selected as stimuli phrases, the phonatory break frequency of which was also higher than that of standard phrase "fù mŭ xīn". RESULT: Phonatory break happened in the reading of all patients. The average number of phonatory break syllables was 14 (3-33). Phonatroy break occurred when saying 177 (77.3%) syllables in the speech corpus. The syllables "guŏ, rén, zāng, diàn, chē, gè, guăn, a, bā, ne, de" broke in 23.1%-41.0% patients. These syllables belonged to the phrases "pĭng guŏ, huŏ chē, shì de, nĭ shì gè hăo rén, wŏ mén shì yŏu zŏng shì bă qĭn shì nong dé hĕn zāng, wŏ mén nà biān yŏu wăng qiú yùn dong chăng, cān gŭan, jiŭ bā hé yī gè miàn bāo dìan, tā shì duō me kāng kăi a,wŏ yīng gāi zài xìn lĭ xiĕ yī xiē shén mē ne?". Thirty-seven patients (97.3%) had phonatory break in above mentioned words. Ratios of these words phonatory break also were more than "fù mŭ xīn". CONCLUSION Adductor spasmodic dysphonic patients exhibited different degrees of phonatory break in mandarine Chinese. The phrases" shì de, pĭng guŏ, huŏ chē, nĭ shì gè hăo rén, wŏ mén nà biān yŏu wăng qiú yùn dong chăng, cān gŭan, jiŭ bā hé yī gè miàn bāo dìan, tā shì duō me kāng kăi a" were recommended as stimuli phrases for adductor spasmodic dysphonia evaluation.
Dysphonia ; diagnosis ; physiopathology ; Female ; Humans ; Language ; Male ; Phonation ; Spasm ; diagnosis ; physiopathology ; Voice