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Objective:To investigate the clinical significance of graft-versus host disease (GVHD)accompanied with new T-cell receptor (TCR) genes clonal rearrangement after allogeneic hematopoietic stem cell transplantation (allo-HSCT).Methods:The clinical data of 2 patients admitted to People's Hospital of Henan University from December 2018 to March 2020 who developed GVHD after allo-HSCT accompanied with TCR genes clonal rearrangement were retrospectively analyzed, and the related literatures were reviewed.Results:Patient 1 was diagnosed with peripheral T-cell lymphoma non-specific type (PTCL-NOS), and then developed severe acute GVHD (aGVHD) after identical sibling allo-HSCT, and gradually developed liver chronic GVHD (cGVHD), skin cGVHD and new TCR genes clonal rearrangement. Patient 2 was diagnosed with acute myeloid leukemia (AML)-M 4, and severe aGVHD, hepatic cGVHD, and clonal rearrangement of TCR genes were gradually detected after identical sibling allo-HSCT. Conclusions:The TCR genes clonal rearrangement after allo-HSCT is not necessarily suggestive of tumors, and it may be related to lymphocyte development disorder caused by GVHD, so the comprehensive judgement should be carefully made.
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AIM: To evaluate the lacrimal gland parameters and their correlation with clinical examination in patients with thyroid-associated ophthalmopathy(TAO)using orbital magnetic resonance imaging(MRI).METHODS: A total of 38 patients(76 eyes)with TAO were selected as case group, and 26 patients(52 eyes)who matched the gender and age with case group and volunteered to accept examination were selected as normal control group. Patients in case group were categorized into active TAO group and inactive TAO group according to the modified clinical activity score(CAS). The exophthalmos was evaluated on T1WI after obtaining the MRI images, the longest lacrimal gland length, width, and the biggest area in axial and coronal images were evaluated on T2WI, and the maximum T2 value and mean T2 value of the lacrimal gland were recorded.RESULTS: There were no significant differences in age, gender and exophthalmos between active TAO and inactive TAO(P>0.05). The area of lacrimal gland was higher in active TAO than that in inactive TAO, and was higher in inactive TAO than that in control group in coronal and axial section(all P<0.01). The length of lacrimal gland in coronal and axial section was higher in the active TAO than that in the inactive TAO and the control group(all P<0.05). The width of lacrimal gland in coronal and axial section was higher in active TAO and inactive TAO than that in the control group(all P<0.05). The maximum T2 value in the active TAO was higher than that in the inactive TAO and control group, and the inactive TAO was higher than that in the control group(all P<0.05). The average T2 value in the active TAO was higher than that in the inactive TAO and control group(all P<0.05). CAS was positively correlated with lacrimal gland area in axial, coronal section and maximum T2 value(all P<0.01).CONCLUSION: The lacrimal gland is significantly enlarged in patients with TAO, especially in active TAO. The lacrimal gland area in axial, coronal section and maximum T2 value could be potentially utilized as valuable radiographic biomarkers for the activity of TAO.
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AIM: To explore the key genes and molecular markers involved in the retinoblastoma development through bioinformatics.METHODS: The mRNA microarray datasets from the Gene Expression Omnibus(GEO)database were obtained, and the differentially expressed gene(DEG)between retinoblastoma cell lines and normal retinal pigment epithelial(RPE)cell lines were analyzed through gene ontology(GO)and KEGG enrichment analysis. To screen key genes, establish protein-protein interaction(PPI)network, and use receiver operating characteristic(ROC)curve to assess clinical diagnostic efficacy. The RNA expressions of key genes in retinoblastoma cell lines and normal RPE cell lines were compared by qRT-PCR.RESULTS: A total of 121 DEGs were obtained from the retinoblastoma dataset of GSE97508 and GSE110811. KEGG pathway analysis showed that DEG were enriched in phototransduction, cell cycle, and p53 signaling pathways. A total of 9 key genes, including MCM6, DTL, UBE2T, TOP2A, NUSAP1, CENPK, RRM2, RLBP1, and RHO, were obtained from the intersection of PPI network analysis and the top 30 DEG from each dataset. The differentially expressed 9 key genes were verified in GSE24673. ROC analysis showed that the area under the curve(AUC)for UBE2T, RRM2, and RHO was ≥80%, and there was a statistical significance(P>0.05). The mRNA level of UBE2T and RRM2 in retinoblastoma was significantly higher than APRE-19 cell line, while the mRNA level of RHO was significantly lower than that of ARPE-19 cell line.CONCLUSION: UBE2T, RRM2, and RHO may be served as potential molecular markers and potential therapeutic targets for retinoblastoma.
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BACKGROUND@#There have been many significant advances in the diagnosis and treatment of non-small cell lung cancer (NSCLC). However, the mechanism underlying the progression of NSCLC is still not clear. Plant homodomain finger-like domain-containing protein 5A (PHF5A) plays an important role in processes of chromatin remodeling, morphological development of tissues and organs and maintenance of stem cell pluripotency. This study aims to investigate the role of PHF5A in the proliferation and migration of NSCLC.@*METHODS@#A549 and PC-9 PHF5A overexpression cell lines were constructed. PHF5A expression was decreased in H292 and H1299 cells by using siRNA. Flow cytometry was used to detect the cell cycle. MTT assay and clone formation assay were used to examine the proliferative ability of NSCLC, while migration assay and wound healing assay were performed to evaluate the ability of migration. Western blot analysis was used to measure the expressions of PI3K, p-AKT and the associated downstream factors.@*RESULTS@#Up-regulation of PHF5A in A549 and PC-9 cells increased the proliferation rate, while down-regulation of PHF5A in H292 and H1299 cells inhibited the proliferation rate at 24 h, 48 h and 72 h (P<0.05). The metastatic ability was elevated in the PHF5A-overexpresion groups, while reduced in the PHF5A-down-regulation group (P<0.05). In addition, reduced expression of PHF5A induced cell cycle arrest at G1/S phase (P<0.05). Furthermore, decreased expression of PHF5A reduced the expression levels of PI3K, phosphorylation of AKT, c-Myc (P<0.05) and elevated the expression of p21 (P<0.05).@*CONCLUSIONS@#These results demonstrated that PHF5A may play an important role in progression of NSCLC by regulating the PI3K/AKT signaling pathway.
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Humans , Carcinoma, Non-Small-Cell Lung/pathology , Lung Neoplasms/pathology , Proto-Oncogene Proteins c-akt/metabolism , Phosphatidylinositol 3-Kinases/metabolism , Cell Line, Tumor , Cell Proliferation/genetics , Cell Movement/genetics , Gene Expression Regulation, Neoplastic , Trans-Activators/genetics , RNA-Binding Proteins/metabolismABSTRACT
OBJECTIV E To in vestigate the situation ，achievements and proble ms of consistency evaluation policy of generic medicines in China. METHODS The descriptive analysis was performed after collecting and sorting out the information of generic medicine passing consistency evaluation （GMPCE） published on the official website of the National Medical Products Administration. The basic information ，the distribution and changes of GMPCE were analyzed statistically in National Essential Medicine List （hereinafter refer to as “essential medicine list ”），Medicine List for National Basic Medical Insurance ，Industrial Injury Insurance and Maternity Insurance （hereinafter refer to as “medical insurance list ”）and the result of the successful selection of centralized medicine procurement organized by the state （hereinafter refer to as “centralized procurement list ”）. RESULTS From 2017 to 2021，415 chemical generic drugs had passed consistency evaluation in China ，including 309 varieties，1 822 specifications， 6 dosage forms ，and 17 pharmacological mechanisms ，basically belonging to 30 provinces，and 492 drug manufacturers （except 12 products had not been found the manufacturers ）；the proportion of GMPCE in essential medicine list increased from 0.96％ in 2012 edition to 25.40％ in 2018 edition；that of GMPCE in medical insurance list increased f rom 2.13％ in 2017 edition to 11.68％ in 2021 edition；in the first 5 batches of centralized procurement list，GMPCE accounted for 81.65％，and the maximum price drop after entering the list was 97.52％. CONCLUSIONS The policy linkage has been achieved with the continual increase of the number of GMPCE and their total amount in three lists in China. The accessibility and affordability of related medicines have been improved with the apparent decrease of the price of those medicines. H owever，total number of GMPCE is a little small，with the higher repetition rate of variety and the low proportion in the three lists ；the guarantee measures of those medicine supply need to be strengthened.
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Astragali Radix is a traditional Chinese herbal medicine with a long history, which has the functions of tonifying Qi and promoting urination and granulation. Astragalosides are the main effective components of Astragali Radix, and more than 40 triterpenoid saponins have been obtained from Astragalus membranaceus and its related plants, mainly including astragalosides Ⅰ-Ⅷ, isoastragalosides Ⅰ, Ⅱ, and Ⅳ, acetylastragalosides, and soyasaponins. Astragalosides have a wide range of biological activities, such as immunomodulation, antioxidation, and neuroprotection. Nervous system diseases seriously affect people's quality of life, threaten human physical and mental health, and impose a burden on families and society. As natural drugs, astragalosides have good preventive and therapeutic effects on central nervous system diseases. This paper reviews the main pharmacological effects and mechanisms of astragalosides in the treatment of multiple sclerosis, Parkinson's disease, Alzheimer's disease, and cerebral ischemic stroke and proposes the research prospects and potential problems, aiming to provide reference for the clinical application and basic research of astragalosides.
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Humans , Astragalus Plant , Astragalus propinquus , Drugs, Chinese Herbal , Nervous System Diseases , Quality of Life , Saponins/pharmacologyABSTRACT
In this work, we describe the development of Polar Gini Curve, a method for characterizing cluster markers by analyzing single-cell RNA sequencing (scRNA-seq) data. Polar Gini Curve combines the gene expression and the 2D coordinates ("spatial") information to detect patterns of uniformity in any clustered cells from scRNA-seq data. We demonstrate that Polar Gini Curve can help users characterize the shape and density distribution of cells in a particular cluster, which can be generated during routine scRNA-seq data analysis. To quantify the extent to which a gene is uniformly distributed in a cell cluster space, we combine two polar Gini curves (PGCs)-one drawn upon the cell-points expressing the gene (the "foreground curve") and the other drawn upon all cell-points in the cluster (the "background curve"). We show that genes with highly dissimilar foreground and background curves tend not to uniformly distributed in the cell cluster-thus having spatially divergent gene expression patterns within the cluster. Genes with similar foreground and background curves tend to uniformly distributed in the cell cluster-thus having uniform gene expression patterns within the cluster. Such quantitative attributes of PGCs can be applied to sensitively discover biomarkers across clusters from scRNA-seq data. We demonstrate the performance of the Polar Gini Curve framework in several simulation case studies. Using this framework to analyze a real-world neonatal mouse heart cell dataset, the detected biomarkers may characterize novel subtypes of cardiac muscle cells. The source code and data for Polar Gini Curve could be found at http://discovery.informatics.uab.edu/PGC/ or https://figshare.com/projects/Polar_Gini_Curve/76749.
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BACKGROUND: MicroRNA-21 (miR-21) is a regulator of osteoclastogenesis and a promoter of osteoclast differentiation, but its role in periodontitis remains unclear. OBJECTIVE: To investigate whether miR-21 is involved in bone destruction in periodontitis. METHODS: Real-time PCR was used to detect and analyze the differential expression of miR-21 in periodontitis samples. Using liposome transfection method, miR-21 mimics (up-regulating miR-21) or miR-21 inhibitor (down-regulating miR-21) was used to transfect osteoclasts. Expressions of miR-21 and bone destruction markers TRAP and CTSK were detected by real-time PCR. Cell counting kit-8 was used to detect the miR-21 effect on osteoclast proliferation. RESULTS AND CONCLUSION: (1) MiR-21 expression increased in periodontitis samples. (2) When miR-21 mimics was transfected into osteoclasts, miR-21, TRAP and CTSK mRNA expression increased; when miR-21 inhibitor was transfected into osteoclasts, miR-21, TRAP and CTSK mRNA expression decreased. (3) Transfection with miR-21 mimics promoted the proliferation of osteoclasts, while transfection with miR-21 inhibitor inhibited the proliferation of osteoclasts. To conclude, miR-21 can be used as an important target for the treatment of periodontitis.
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OBJECTIVE@#To objectively evaluate the safety of acupoint catgut embedding therapy.@*METHODS@#A total of 331 patients who received acupoint catgut embedding therapy were enrolled and summarized through the inpatient medical record system, follow-up record and adverse reaction report card. The statistical analysis was performed from the aspects of patients' gender, age, marital status, history of allergy, history of diabetes and the time, symptoms, duration and prognosis of adverse reactions, etc.@*RESULTS@#Among 331 patients who received acupoint catgut embedding therapy, 70 patients had adverse reactions, which were divided into 9 types, including post-treatment discomfort, local hematoma or subcutaneous hemorrhage, local swelling, local induration, severe pain, thread-body rejection, local pruritus, post-treatment body temperature rising, local redness, swelling, fever and pain. The incidence rate of adverse events was 21.15%, and the incidence of serious adverse events was 0. Among the patients with adverse reactions, 58 patients (82.86%) relieved without treatment, and 12 patients (17.14%) received after symptomatic treatment; all patients had no sequelae.@*CONCLUSION@#The acupoint catgut embedding therapy is relatively safe and the incidence of adverse reactions is low.
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Small interfering RNA (siRNA) has been used to treat various skin diseases. However, siRNA is limited in application due to its electronegativity, strong polarity, easy degradation by nuclease and difficulty in breaking through the skin barrier. Therefore, safe and efficient siRNA delivery vector is the premise of effective treatment of skin diseases by siRNA. In recent years, with the deepening of research on siRNA, great progress has been made in the development of delivery systems based on lipids, polymers, peptides and nanoparticles, some new transdermal delivery vectors of siRNA have emerged, such as liposomes, dendrimers, cell penetrating peptides, and spherical nucleic acid nanoparticles. This review will focus on the recent advance in siRNA transdermal delivery vectors.
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Humans , Administration, Cutaneous , Genetic Vectors , RNA, Small Interfering , Skin Diseases , TherapeuticsABSTRACT
Objective@#To explore the effects of precollege peer bullying at different stages, on quality of life (QOL) among college students.@*Methods@#A stratified cluster sampling method was used to select participants in October, 2018. Cluster sampling method was adopted to recruit a sample of 4 034 college students from four universities in Hefei city, Anhui province. Relations between peer bullying at different stages before entering college, and the quality of life, were investigated. t test and analysis of variance were used to compare the differences of QOL in different groups. Multiple linear regression models were used to assess the associations between various types of peer bullying at different stages and the QOL at precollege days.@*Results@#Among all the 4 034 college students under study, mean scores of the 4 dimensions of QOL appeared as physical (12.61±2.02), psychological (14.09±2.62), social relationship (13.72±2.71) and environment (13.77±2.46), respectively. After adjusting the confounding factors, data from multiple linear regression showed that, factors as verbal bullying victimization during primary school (β=-0.21)/secondary school (β=-0.27)/or at both periods (β=-0.56), relational (β=-0.21) and physical (β=-0.38) bullying victimization in secondary school, and physical bullying victimization in both periods (β=-0.67) were negatively correlated with the physical dimension of QOL. Verbal bullying victimization in both periods (β=-0.41) and relational bullying victimization in secondary school (β=-0.42) were negatively correlated with psychological dimension of QOL. Factors as relational (β=-0.32) and physical (β=-0.51) bullying victimization in secondary school, physical/cyber bullying victimization in both periods (β=-0.57) were negatively correlated with the social dimension of QOL. Verbal bullying victimization during primary school (β=-0.20) and both periods (β=-0.46), relational bullying perpetration during primary school (β=-0.35) or at both periods (β=-0.90) were negatively correlated with the environmental dimension of QOL (All P<0.05). Index related to bullying victimization (β=-0.33, -0.36, -0.30, -0.33) and bullying perpetration β=-0.28, -0.31, -0.23, -0.28) were both negatively correlated to all the 4 dimensions (physical, psychological, social relationship and environment) of QOL (P<0.001).@*Conclusions@#Various forms of peer bullying experiences occurring before college, were associated with the decreased scores of QOL in different domains, among the university students. Programs on prevention and control of peer bullying in different stages before college days seemed important thus should be strengthened.
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Objective@#To explore the role of hypothalamus Polycomb Group (PcG) gene (Eed, Ezh) methylation in the relationship between bisphenol A (BPA) exposure during pregnancy and premature puberty in female offspring.@*Methods@#A total of 40 pregnant CD-1 mice were randomly and averagely assigned into four groups: control group (corn oil) and low, middle and high BPA-exposed groups (the poisonous doses were 8 mg/kg, 40 mg/kg, and 200 mg/kg, respectively) by random number table method. Each group was administered by gavage from gestational day (GD) 1 to 18. The vaginal opening of female offspring was observed from postnatal day (PND) 21 to 33. All female offsprings were sacrificed, and hypothalamus was remained on the PND 34. The methylation levels of Eed and Ezh in the hypothalamus were measured. The early puberty of CD-1 mice was evaluated by the rate of vaginal opening in advance, initial time of vaginal opening, the first estrus occurrence and vaginal opening days in advance. The path model was used to explore the role of Eed and Ezh gene methylation in the early puberty of female offspring with maternal BPA exposed including the number of days of vaginal opening in advance as a dependent variable and BPA exposure as an independent variable.@*Results@#The rate of vaginal opening on the 28 day in each maternal BPA-exposure group [low, middle and high BPA-exposed groups were 40.00% (29/72), 47.62% (25/53) and 37.84% (20/53), respectively] was higher than that rate in the control group [14.06%(9/64)]. Similarly, the P50(P25, P75) values of initial time of vaginal opening in low, middle and high BPA-exposed group were 28 (26, 30), 28 (26, 29), 28 (26, 30) days, respectively and the P50(P25, P75) values of the first estrus occurrence in low, middle and high BPA-exposed group were 31 (27, 32), 30 (27, 31), 31 (28, 33) days, respectively, which were earlier than those in the control group [initial time of vaginal opening was 30(28, 31) days, and the first estrus occurrence was 32(30, 33) days] (all P values<0.05). Compared with the control group (the methylation levels of Eed1, Eed2, Ezh2 were 1.47%, 1.26%, 2.56%, respectively), the methylation levels of Eed1 (1.61%-1.82%), Eed2 (1.36%-1.43%) and Ezh2 (2.87%-3.05%) in female offspring were significantly higher in BPA-exposed groups (all P values<0.05). The results of path model analysis showed that BPA had no direct influence on puberty in advance, but had an indirect effect on puberty in advance (indirect effect path coefficient was 0.045 and 0.142, respectively) by mediating methylation of Eed2, and Ezh2.@*Conclusion@#Early puberty in female offspring induced by maternal exposure to BPA during pregnancy through the increased methylation levels of hypothalamus PcG gene (Eed, Ezh) in female offspring.
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BACKGROUND: As a special source of stem cells, dental pulp stem cells (DPSCs) make much progress in the development of tissue engineering field due to their high proliferation and self-renewal ability. In the certain conditions DPSCs can be induced to differentiate into a variety of specialized tissue cells, providing a new way for tissue engineering development. OBJECTIVE: To review the main progress in the DPSCs biological characteristics, original source, isolation method, and its related application in tissue engineering research. METHODS: "Dental pulp stem cell, differentiation, regenerative medicine, tissue engineering" in English and Chinese were termed as the keywords to search relevant articles about DPSCs and tissue engineering published from 2005 to 2017 in PubMed, Medline, WanFang, and CNKI databases. After removal of repetitive or irrelevant articles, 66 articles were finally reviewed. RESULTS AND CONCLUSION: With the development of tissue engineering and regenerative medicine, the effective combination of DPSCs and tissue engineering scaffolds have be further achieved. Recent studies on DPSCs focus on the properties of DPSCs differentiating into odontoblasts and osteocytes/osteoblasts and on the potential of nerve repair, vascular remodeling, corneal reconstruction and chondrogenic differentiation.
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BACKGROUND:Bio-Oss bone substitutes have been shown to prevent bone resorption by slowing bone resorption,reducing bone resorption,and restoring the height of the alveolar ridge.However,most clinical studies focus on the efficacy within 1-3 months.OBJECTIVE:To compare the effects of two kinds of bone substitutes on the height of alveolar ridge and the periodontal tissue health status after implantation into the extraction socket of the wisdom tooth.METHODS:Forty patients with impacted mandibular teeth were randomly divided into two groups:Bio-Oss Collagen material was implanted in experimental group (n=20),and Bio-Oss bone replacement materials in control group (n=20).Cone-beam CT was retrospectively reviewed at 1,3 and 12 months after implantation.Alveolar bone height,bone changes and the second molars mobility were examined.Meanwhile,healing status of tooth extraction and gingival mucosa as well as the material spills were observed.RESULTS AND CONCLUSION:(1) At 1 month after implantation,the gingival mucosa of both groups healed well without swelling.There was no spillover in the experimental group,while there were two cases of bone material spill in the control group.No tissues generated in the extraction socket and tooth loosening was observed in both groups.(2) At 3 months after implantation,the materials gradually degraded with no swelling and with generation of partial bone tissues in the experimental group,and the tooth mobility was improved.In the control group,there was also no swelling in the gums,and the materials degraded partially,but there was no presence of new bone and no improvement in the tooth mobility.(3) At 12 months after implantation,there was no swelling in the gums of the experimental group,obvious new bone tissues formed in the second molar with the presence of bone trabecula.The new bone tissues were integrated with the surrounding bone tissues.The crest of the alveolar ridge was located about 3 mm below the enamel cementum,the tooth mobility was restored to the level before extraction,and the chewing function recovered.In the control group,there was no swelling in the gums,and new bone tissues formed in the distal part of the molar,but the trabecular arrangement was not aligned.The crest of the alveolar was located about 3 mm below the enamel cementum,the tooth mobility returned to the pre-extraction level,and the chewing function was normal.(4) The height of the alveolar bone at 1 and 3 months after implantation was significantly higher in the experimental group than the control group (P ＜ 0.01),while there was no significant difference between the two groups at 12 months after implantation.To conclude,implantation of Bio-Oss Collagen immediately after removal of the impacted wisdom tooth of the mandible is beneficial to alveolar bone height and bone quality recovery,and significantly improves the periodontal health of the second molar,but the long-term effect needs further observation.
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Objective To investigate the correlation between the subjective well-being,optimism and coping mode of patients with inflammatory bowel disease(IBD). Methods A total of 159 IBD patients were surveyed and analyzed by the general information questionnaire, General Well-Being Schedule, Revised The Life Orientation Test, and Simplified Coping Style Questionnaire. Results The subjective well-being scores of IBD patients were (75.04 ± 14.32). And the Pearson analysis showed that subjective well-being scores were positively correlated with optimism scores and positive coping scores(r=0.408, P＜0.01; r=0.429, P＜0.01). Negative coping was negatively correlated with subjective well-being scores(r=-0.174, P＜0.05). Optimism had a direct positive predictive effect on subjective well-being with a path coefficient of 0.22, and coping mode was an intermediary variable of optimism and subjective well-being. Conclusion The subjective well-being of patients with IBD needs to be further improved, which is both related to optimism and coping mode. Coping mode takes effects as a mediator in optimism and subjective well-being.
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BACKGROUND: Most studies suggest tooth whitening can create a coarse enamel surface which is likely to attract exogenous dyeing material and form the phenomenon of color relapse. After dental bleaching procedure, the use of resin surface treatment agent is expected to make the enamel surface smooth and alleviate tooth color relapse. OBJECTIVE: To unravel the efficacy of Adper Single Bond 2 Adhesive on color relapse phenomenon after dental bleaching treatment by cold light (xenon laser) whitening.METHODS: Twenty-four extracted teeth were collected and coated with 35% hydrogen peroxide followed by xenon laser whitening. The test group was made up of 12 samples coated with light-cured resin surface treatment agent and the left samples as control group were treated with no-coating agent after tooth whitening. Then the two groups were divided into two subgroups which were soaked in distilled water and tea for aging test respectively. The color differences (ΔE) which provided comparative values for statistical analysis was recorded at 1, 3, 5, 7, 14, 21, 28, 35 and 42 days after the aging test. The enamel surface microstructure of the samples was observed before and after bleaching, after resin agent coating, and 28 days after the aging test.RESULTS AND CONCLUSION: (1) Results from color differences observation: there was no significant difference between samples soaked in distilled water before and after whitening treatment (P > 0.05). Similarly, there was no statistical difference between test group and control group soaked in distilled water (P > 0.05). However, after soaking in tea, the color differences in the test group at 1-42 days showed statistically significant differences from those in the control group (P < 0.05). (2) Results from scanning electron microscope observation: after the tooth whitening producers, the enamel surface was damaged in the presence of cavities. After coated with resin surface treatment agent, the enamel surface became smooth and had few cavities. After soaking in tea, gradient smooth surface, some crack, inconspicuous flake dyeing color layer decomposition could be seen in the test group while rough surface with big holes and mottled dyeing layer were clearly visible in the control group. All samples soaked in distilled water had only a small amount of block dyeing layer, holes, weaker roughness than those soaked in tea. To conclude, Adper Single Bond 2 Adhesive light-cured resin surface treatment agent could weaken color relapse phenomenon after tooth whitening, achieving a smooth enamel surface and reducing dyeing material adhesion.
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BACKGROUND: Most studies suggest tooth whitening can create a coarse enamel surface which is likely to attract exogenous dyeing material and form the phenomenon of color relapse. After dental bleaching procedure, the use of resin surface treatment agent is expected to make the enamel surface smooth and alleviate tooth color relapse. OBJECTIVE: To unravel the efficacy of Adper Single Bond 2 Adhesive on color relapse phenomenon after dental bleaching treatment by cold light (xenon laser) whitening.METHODS: Twenty-four extracted teeth were collected and coated with 35% hydrogen peroxide followed by xenon laser whitening. The test group was made up of 12 samples coated with light-cured resin surface treatment agent and the left samples as control group were treated with no-coating agent after tooth whitening. Then the two groups were divided into two subgroups which were soaked in distilled water and tea for aging test respectively. The color differences (ΔE) which provided comparative values for statistical analysis was recorded at 1, 3, 5, 7, 14, 21, 28, 35 and 42 days after the aging test. The enamel surface microstructure of the samples was observed before and after bleaching, after resin agent coating, and 28 days after the aging test.RESULTS AND CONCLUSION: (1) Results from color differences observation: there was no significant difference between samples soaked in distilled water before and after whitening treatment (P > 0.05). Similarly, there was no statistical difference between test group and control group soaked in distilled water (P > 0.05). However, after soaking in tea, the color differences in the test group at 1-42 days showed statistically significant differences from those in the control group (P < 0.05). (2) Results from scanning electron microscope observation: after the tooth whitening producers, the enamel surface was damaged in the presence of cavities. After coated with resin surface treatment agent, the enamel surface became smooth and had few cavities. After soaking in tea, gradient smooth surface, some crack, inconspicuous flake dyeing color layer decomposition could be seen in the test group while rough surface with big holes and mottled dyeing layer were clearly visible in the control group. All samples soaked in distilled water had only a small amount of block dyeing layer, holes, weaker roughness than those soaked in tea. To conclude, Adper Single Bond 2 Adhesive light-cured resin surface treatment agent could weaken color relapse phenomenon after tooth whitening, achieving a smooth enamel surface and reducing dyeing material adhesion.
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Objective@#To determine the possible relations between hair cortisol concentration (HCC) as a biomarker of chronic stress and childhood overweight and obesity.@*Methods@#Children from grade 1 to 3 from 2 primary schools in Bengbu were invited to participate in the study; and those who suffer from mental disorders, endocrine diseases and those who took hormone drugs were excluded. Parental questionnaire was implemented to collect information on physical activity, screen time, sleep duration, sugar-beverage consumption, as well as socio-economic status. Height and weight were examined. Eligible hair samples from 1 263 children (598 boys and 665 girls) were obtained, and the cortisol content was determined. Multivariate logistic regression model analysis was recruited to examine the association between HCC quartiles and overweight and obesity among boys and girls, respectively.@*Results@#HCC in P50 (P25-P75) among girls and boys was separately 11.86 (10.57-13.15) and 11.71 (10.54-13.09) µg/kg (Z=-0.886, P=0.376); HCC in P50 (P25-P75) among non-overweight, overweight and obesity boys was separately 11.62 (10.45-12.82), 12.24 (10.88-13.55) and 12.30 (10.99-13.53) µg/kg (χ2=8.24, P=0.016); HCC in P50 (P25-P75) among non-overweight, overweight and obesity girls was separately 11.35 (10.06-12.62), 12.07 (11.04-13.21) and 12.59 (11.12-13.63) µg/kg (χ2=36.16, P<0.001). After age, physical activity, screen time, sleep duration, sugared beverages and socio-economic status adjusted, compared with HCC in Q1 level, girls whose HCC in Q2, Q3 Q4 level had higher rates in overweight, with OR (95%CI) at 1.10 (1.04-3.32), 2.59 (1.51-4.45) and 3.16 (1.79-5.57), respectively. Girls with HCC in Q3 and Q4 level had higher rates in obesity, with OR (95%CI) at 2.22 (1.16-4.26) and 5.62 (3.04-10.41). Among boys, highest quartiles in HCC was risk factor for overweight, OR (95%CI) was 2.14 (1.18-3.90).@*Conclusion@#Hair cortisol had a significant relation with overweight and obesity in 6-9 years old childhood especially among girls.
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Objective To analyze the differences between CyberKnife radiotherapy with different numbers of gold markers.Methods A total of 424 patients undergoing CyberKnife with gold markers from 2013 to 2014 were enrolled and analyzed.In these patients,330 patients with no less than 3 gold markers were assigned to observation group and 94 patients with less than 3 gold markers were assigned to control group.The setup error and treatment error were recorded and analyzed for each patient.Results The mean setup error and mean treatment error were 0.031 mm and 0.314 mm in the observation group and 0.057 mm and 1.122 mm in the control group,respectively.Conclusion Tracking no less than 3 gold markers can substantially improve the accuracy and quality of treatment.
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BACKGROUND:Recent years, fiber posts and resin cores have been widely used in repairing the endodonticaly treated teeth with satisfactory effect. Erbium:yttrium aluminum garnet (Er:YAG) laser is a new type of water power laser system, which can be used for surface treatment of fiber posts. But studies on the effect of Er:YAG laser surface treatment on the bond strength of fiber posts are rarely reported. OBJECTIVE: To evaluate the effect of surface treatment utilizing Er:YAG laser irradiation with different parameters on the bond strength of fiber posts to root canal dentin. METHODS: Fifty human maxilary central incisors that had similar dimensions were used. After endodontic treatment, removal of the crown and canal preparation, ParaPost FIBER LUX glass fiber posts were cemented into the root canals. According to the method of surface treatment, 50 teeth were randomly divided into: no surface treatment as control group; four groups undergoing surface preparation with Er:YAG laser with four different power settings (150, 250, 350 and 450 mJ at 10 Hz for 60 s at 100-μs pulse duration), named 1.5, 2.5, 3.5, and 4.5 W Er:YAG laser irradiation groups, respectively. RESULTS AND CONCLUSION: The mean bond strength values reduced from the cervical to the apical root canal, and the bond strength of the dental cervix was significantly different from that of middle and apical thirds (P 0.05). Regardless of the different part of the root slices, the bond strength was highest in the 4.5 W Er:YAG laser irradiation group, showing significant difference from other groups (P < 0.05). These findings indicate that 4.5 W Er:YAG laser irradiation significantly increases the bond strength of the fiber posts to root canal dentin.