Please wait a minute...
Table of Content
01 December 2020, Volume 38 Issue 6
  • Multidisciplinary team model for patients with oral cancer and systemic diseases: an expert consensus
    Zhang Dongsheng, Zheng Jiawei, Zhang Chenping, Cai Zhigang, Li Longjiang, Liao Guiqing, Shang Zhengjun, Sun Moyi, Han Zhengxue, Shang Wei, Meng Jian, Gong Zhongcheng, Huang Shengyun
    West China Journal of Stomatology. 2020, 38(6):  603-615.  doi:10.7518/hxkq.2020.06.001
    Abstract ( 2327 )   HTML ( 214 )   PDF(pc) (995KB) ( 2431 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Large general hospitals currently play an increasingly important role in the diagnosis and treatment for acute critical patients and difficult diseases because of the development of dual referral system and hierarchical diagnosis, as well as the formation of medical treatment alliance. Patients with oral cancers are often associated with systemic diseases, which increases the complexity of the condition. Thus, meeting the demand through the traditional single medical model is difficult. As such, a multidisciplinary team (MDT) model has been proposed and has achieved a good clinical effect. To standardize the application of this model, we organized an event in which relevant experts discussed and formulated a consensus to provide standardized suggestions on the MDT process and the diagnosis and treatment of common systemic diseases as reference for clinical practice.

    Oral implant treatment for elderly patients
    Yuan Quan
    West China Journal of Stomatology. 2020, 38(6):  616-621.  doi:10.7518/hxkq.2020.06.002
    Abstract ( 1980 )   HTML ( 380 )   PDF(pc) (885KB) ( 2514 )   Save
    References | Related Articles | Metrics

    With the advance of materials and technologies, modern oral implantology developed rapidly. Dental implant has become the first choice to restore the missing teeth. Although it achieves a high success rate among healthy adults, for elderly patients, with the decline of physical function and other systemic diseases, the risks of implant treatment increase accordingly. Doctors should pay more attention to the factors that may affect the implant treatment of the elderly and ways of preventing possible risks and complications. Here we discuss the specificity, success rate, effect of systemic diseases and drug considerations of implant treatments in elderly patients.

    MicroRNA model that can predict the prognosis of oral squamous cell carcinoma based on bioinformatics analysis
    Zhao Ge, Li Changxue, Guo Chao, Zhu Hui
    West China Journal of Stomatology. 2020, 38(6):  622-627.  doi:10.7518/hxkq.2020.06.003
    Abstract ( 766 )   HTML ( 25 )   PDF(pc) (1249KB) ( 728 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective The microRNA (miRNA) prognostic model can predict the prognosis of patients with oral squamous cell carcinoma (OSCC) on the basis of bioinformatics. Moreover, it can accurately group OSCC patients to improve targeted treatment. Methods We downloaded the miRNA and mRNA expression profile and clinical data of OSCC from The Cancer Genome Atlas (TCGA). The risk score model of miRNA was screened and established by univariate and multivariate Cox regression models. The performance of this prognostic model was tested by receiver operating characteristic (ROC) curves and area under the curve (AUC). The target genes of six miRNAs were predicted and intersected with differential mRNA for enrichment analysis by Kyoto Encyclopedia of Genes and Genomes (KEGG) signaling pathway and gene ontology (GO) enrichment analysis. A protein protein interaction network (PPI) was constructed to screen hub genes. Results By using univariate and multivariate Cox regression analyses, the prognostic risk model was obtained. The AUC of the ROC curve for predicting 5-year survival in the training group, test group, and whole cohort were 0.757, 0.673, and 0.724, respectively. Furthermore, univariate Cox regression and multivariate Cox regression considering other clinical factors showed that the six-miRNAs signature could serve as an independent prognostic factor (P<0.001). The top 10 hub genes in the PPI network screened by intersecting target genes include CCNB1, EGF, KIF23, MCM10, ITGAV, MELK, PLK4, ADCY2, CENPF, and TRIP13. EGF and ADCY2 were associated with survival prognosis (P<0.05). Conclusion The six-miRNAs signature could efficiently function as a novel and independent prognostic model for OSCC patients, which may be a new method to guide the accurate targeting treatment of OSCC.

    Mechanisms of the mechanically activated ion channel Piezo1 protein in mediating osteogenic differentiation of periodontal ligament stem cells via the Notch signaling pathway
    Wang Lin, Wang Xi, Ji Nan, Li Haimei, Cai Shixin
    West China Journal of Stomatology. 2020, 38(6):  628-636.  doi:10.7518/hxkq.2020.06.004
    Abstract ( 1047 )   HTML ( 37 )   PDF(pc) (3012KB) ( 1207 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To explore the mechanism of Piezo1 protein in mediating the osteogenic differentiation of human periodontal ligament stem cells (hPDLSCs) via the Notch signaling pathway. Methods In this study, young permanent teeth extracted from impacted teeth of 8-14-year-old children from January 1, 2016 to January 1, 2018 in the Department of Orthodontic, Beijing Children’s Hospital were selected as cell sources. hPDLSCs were extracted by enzymatic digestion. Immunohistochemical staining was used to detect the expression of keratin and vimentin, and flow cytometry was used to identify the markers (CD146 and STRO-1) of hPDLSCs. The construction and screening of Piezo1 siRNA gene interference vector and Piezo1 gene overexpression plasmid were completed. Flexcell 4000T mechanical distraction stress instrument was used to construct hPDLSC cell model in vitro. According to the preliminary results, the experiment was divided into five groups: siRNA interference group, overexpression group, blank control group, stretch stress group, and negative control group. Real time quantitative polymerase chain reaction (RT-qPCR) was used to detect the expression of Piezo1, Notch1, alkaline phosphatase (ALP), Runt-related transcription factor 2 (Runx2), osteocalcin (OCN), and bone sialoprotein (BSP). Western blot was used to detect the expression of ALP and Runx2. Fluo-3 AM probe was used to detect intracellular calcium content. Results Vimentin staining of hPDLSCs was positive, and keratin staining was negative. Flow cytometry was used to detect the expression of STRO-1 and CD146, markers of hPDLSC. Empty viral vectors, siRNA-Piezo1 interference sequence, and Piezo1 overexpression vector sequence could be transfected into hPDLSC by lentivirus, and the transfection efficiency was high (approximately 90%). The reverse transcription-polymerase chain reaction (RT-PCR) results showed that there were significant differences in Piezo1 gene levels among the siRNA interference group, overexpression group, blank control group, stretch stress group, and negative control group (F=9.573, P<0.05). The level of Piezo1 in the overexpression group was significantly higher than that in the siRNA interference group (q=3.893, P<0.05). The level of Piezo1 in the stretch stress group was significantly higher than that in the blank control group (q=2.006, P<0.05). The expression of Notch1 and osteogenic genes ALP, Runx2, OCN, and BSP had the same trend. Western blot results showed that there were significant differences in the expression of ALP in the siRNA interference group, overexpression group, blank control group, stretch stress group, and negative control group (F=11.207, P<0.001). The expression level of ALP in the overexpression group was significantly higher than that in the siRNA interference group (q=2.991, P<0.05). The expression of ALP in the stretch stress group was significantly higher than that in the blank control group (q=3.007, P<0.05). The expression of Runx2 protein showed the same trend. The intracellular calcium fluorescence intensity of the overexpression group was significantly higher than that of the siRNA interference group, and the intracellular calcium fluorescence intensity of the stretch stress group was significantly higher than that of the siRNA interference group. Conclusion Mechanical stretch stress can promote the expression of Piezo1 protein. Ca2+ is the second messenger, activates the Notch1 signaling pathway and the expression of ALP, Runx2, OCN, and BSP; and promotes the osteogenic differentiation of hPDLSC. The siRNA-Piezo1 interfering plasmid can block this process. On the contrary, the overexpression plasmid of Piezo1 can promote the osteogenic differentiation of PDLSCs.

    Comparison of the effect and safety of Er:YAG laser combined with fluoride and methylene blue-photodynamic therapy on caries prevention
    Zhang Lei, Yu Xuhong, Yao Liping
    West China Journal of Stomatology. 2020, 38(6):  637-641.  doi:10.7518/hxkq.2020.06.005
    Abstract ( 761 )   HTML ( 21 )   PDF(pc) (2427KB) ( 658 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To compare the anti-caries effect and safety of Er:YAG laser combined with fluoride and methylene blue-photodynamic therapy (MB-PDT). Methods A total of 28 rat dental caries models were established and randomly divided into seven groups: photodynamic therapy (PDT) group, laser combined with fluoride group, laser group, sodium fluoride group, and 0.9% saline control group. Spectrophotometric optical density was used to reflect the growth of Streptococcus mutans. Laser-induced fluorescence diagnostic (LF) instrument was utilized to detect the demineralization degree of dental caries. Histopathological sections were employed to observe the damage of dental pulp and buccal mucosa. Results The optical density (OD) value of the PDT and combination groups was significantly lower than that of other treatment groups (P<0.05). An increase in LF value and demineralization occurred in varying degrees with different treatment methods. Histopathological observation showed that pulp and buccal mucosa injury was more obvious in the combination group of 70 mw·cm-2 and Er:YAG laser group compared with other groups. Conclusion Under the same parameters, the combined group and PDT have good germicidal efficacy, but PDT has fewer adverse reactions and less damage. It is an effective and safe method for caries prevention.

    Finite element analysis of the comprehensive impact of scar and maxillary expansion combined with protraction on the development of maxilla with cleft lip and palate after repair operation
    Huang Wei, Li Yinghui, Guo Kaili, Zhou Yongchuan, Li Xiangjun
    West China Journal of Stomatology. 2020, 38(6):  642-646.  doi:10.7518/hxkq.2020.06.006
    Abstract ( 732 )   HTML ( 32 )   PDF(pc) (2877KB) ( 547 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To study the comprehensive impact of scar and maxillary expansion combined with protraction on the development of maxilla with cleft lip and palate after repair operation. Methods In the original finite element model of the maxilla with cleft palate, a finite element model of the maxilla with cleft lip and palate was established by using Boolean operation in ANSYS. Scar force after cleft lip and palate repair and maxillary expansion force combined with protraction were added simultaneously to process the stress analysis. Results Maxillary deformation occurred in the three-dimensional direction. The comparison of displacements was as follows: X-axis>Z-axis>Y-axis. Conclusion Maxillary growth is significantly inhibited in the three-dimensional direction under the comprehensive impact of scar and maxillary expansion combined with protraction after repair operation, especially transverse and sagittal growth.

    Effect of occlusal thickness design on the fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia
    Lin Zhenxiang, Pan Zaixing, Ye Qiqing, Zheng Zhiqiang, Lin Jie
    West China Journal of Stomatology. 2020, 38(6):  647-651.  doi:10.7518/hxkq.2020.06.007
    Abstract ( 813 )   HTML ( 35 )   PDF(pc) (1243KB) ( 733 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective This study aimed to investigate the effect of occlusal thickness design on fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia. Methods A total of 24 artificial first mandibular molars were randomly divided into four groups with six teeth in each group as follows: group lithium disilicate ceramic-2 mm (lithium disilicate ceramic, with an occlusal thickness of 2 mm and a retainer length of 4 mm); group lithium disilicate ceramic-4 mm (lithium disilicate ceramic, with an occlusal thickness of 4 mm and a retainer length of 2 mm); group zirconia-2 mm (zirconia, with an occlusal thickness of 2 mm and a retainer length of 4 mm); and group zirconia-4 mm (zirconia, with an occlusal thickness of 4 mm and a retainer length of 2 mm). After adhesive cementation (RelyX Ultimate Clicker), all specimens were subjected to thermocycling (10 000 cycles). The specimens were subjected to fracture resistance testing at a 135° angle to the teeth at a crosshead speed of 0.5 mm·min-1 in a universal testing machine. Data were analyzed with ANOVA and Tukey’s HSD test by SPSS 15.0. The failure modes were classified. Results The fracture resistances of groups lithium disilicate ceramic-2 mm, lithium disilicate ceramic-4 mm, zirconia-2 mm, and zirconia-4 mm were (890.54±83.41), (2 320.87±728.57),(2 258.05±557.66), and (3 847.70±495.99) N respectively. Group zirconia-4 mm had the highest fracture resistance, whereas group lithium disilicate ceramic-2 mm had the lowest. Conclusion The fracture resistance of molar endocrown with zirconia is higher than that with lithium disilicate ceramic. Increasing the occlusal thickness can improve the fracture resistance but increase the risk of fracture of abutment.

    Effect of anatomical parameters of maxillary sinus on the outcomes of transcrestal sinus lift
    Zheng Xiaofei, Mo Anchun, Zhu Juanfang, Wang Suping, Du Yajing, Yao Yongzhi
    West China Journal of Stomatology. 2020, 38(6):  652-656.  doi:10.7518/hxkq.2020.06.008
    Abstract ( 896 )   HTML ( 37 )   PDF(pc) (1157KB) ( 736 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To investigate the effect of three anatomical parameters (maxillary sinus width, maxillary sinus angle, and residual bone height) on the outcomes of transcrestal sinus lift with simultaneous implant placement. Methods A total of 60 maxillary sinuses in 42 patients were included in this study. All patients were treated with transcrestal sinus lift procedure associated with simultaneous implant placement using a composite graft material of autogenous bone and Bio-Oss. For each patient, beam computed tomography (CBCT) scans were performed preoperatively, immediately after surgery, and 6 months after surgery. The parameters were measured on the preoperative and postoperative CBCT images. The correlation of three anatomical parameters with graft resorption was analyzed using Pearson’s correlation test. Results The average residual bone height was (4.46±1.55) mm. The average width of maxillary sinus was (13.86±2.71) mm. The average sinus angle was 78.09°±10.27°. A significant positive correlation was observed between maxillary sinus width and graft resorption (P<0.01). A positive association was also found between sinus angle and graft resorption (P<0.01). Conclusion The findings show that graft bone resorption in elevated sinus has a positive correlation with the sinus width and sinus angle.

    Effect of CO2 fractional laser on the early control of scar post-secondary repair in patients with a cleft lip
    Li Yuanyuan, Wu Min, Liu Mingxi, Xie Chenyang, Zheng Qian, Shi Bing, Li Chenghao
    West China Journal of Stomatology. 2020, 38(6):  657-661.  doi:10.7518/hxkq.2020.06.009
    Abstract ( 918 )   HTML ( 17 )   PDF(pc) (1131KB) ( 446 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To observe and compare the clinical efficacy of CO2 fractional laser in the early control of scar post-secondary repair in patients with a cleft lip. Methods In the treatment group, 43 patients with secondary repair of cleft lip were treated via CO2 fractional laser. The control group covered 70 patients post-cheiloplasty. The effect in the two groups after six months was compared. The duration from the beginning of the laser treatment to surgery and patient gender were analyzed to determine if they affected the efficacy of the laser treatment for scars. Results 1) The curative effect in the treatment group was better than that in the control group (P<0.000 1), the total effectiveness rate was 90.7% in the treatment group. 2) No significant statistical difference in efficacy was observed between men and women (P=0.487). Moreover, no significant statistical difference in efficacy (P=0.055) was observed among patients one year after surgery, within the duration of <3 months, and within the duration of ≥3 months. Conclusion CO2 fractional laser had a definite effect on the treatment of scar post-secondary repair in patients with a cleft lip. No significant correlation was observed between treatment effect and patient gender, and no difference was noted among patients one year after surgery. In the beginning of the laser treatment, no difference was observed between the durations of <3 months and ≥3 months after the reconstruction, Therefore, early intervention of scars a year after secondary repair of a cleft lip can achieve good results.

    Velopharyngeal closure pattern and speech characteristics of patients congenital velopharyngeal insufficiency
    Wang Xi, Guo Chunli, Shi Bing, Yin Heng
    West China Journal of Stomatology. 2020, 38(6):  662-666.  doi:10.7518/hxkq.2020.06.010
    Abstract ( 1564 )   HTML ( 23 )   PDF(pc) (954KB) ( 574 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To analyze velopharyngeal closure patterns and speech characteristics of patients with congenital velopharyngeal insufficiency. Methods Patients visiting the Department of Cleft Lip and Palate Surgery, West China Hospital of Stomatology, Sichuan University between 2009 and 2017 were reviewed. Outcomes of subjective speech evaluation, including resonance, consonant articulation, and correction rate, were analyzed. Furthermore, the mobility of soft palate and pharyngeal walls under nasopharyngeal fiberscope were analyzed retrospectively. Results A total of 47 cases were retrieved and subjected to nasopharyngeal fiberscopic examination. Among them, 29 (61.7%) demonstrated a circular closure pattern, 16 (34.0%) showed a coronal pattern, and 2 (4.3%) had a sagittal pattern. Furthermore, 25 (53.2%) presented medium soft-palate mobility, 22 (46.8%) had weak lateral pharyngeal wall mobility, and 41 (87.2%) had no posterior pharyngeal wall mobility. Among all of the patients, 23 (48.9%) presented medium hypernasality, accounting for the highest proportion. Consonant misarticulation occurred in 89.4% of the cases. The articulation manners with the highest correction rate were in the following order: nasal, lateral, fricatives, stops, and affricates. The articulation places with the highest correction rate were in the following order: bilabial, alveolar, velar, and linguadental. Conclusion Circular closure was the most prevalent velopharyngeal closure pattern among patients with congenital velopharyngeal insufficiency, and consonant omission was the most common articulation abnormality.

    Retrospective study on transcrestal sinus floor elevation with simultaneous implantation of short implants
    Huang Jiangqin, Hu Changqi, Xia Xun, Guo Shuigen, Gong Jinmei, Wei Hongwu
    West China Journal of Stomatology. 2020, 38(6):  667-671.  doi:10.7518/hxkq.2020.06.011
    Abstract ( 807 )   HTML ( 18 )   PDF(pc) (1012KB) ( 582 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective To explore the changes in bone height of the maxillary sinus floor at different sinus ridge heights after transcrestal sinus floor elevation (tSFE) with the simultaneous implantation of short implants. Methods A total of 74 Bicon short implants were implanted into 37 patients during the same period of maxillary sinus elevation. The residual bone height (RBH)<4 mm group has 43 sites, and the RBH≥4 mm group has 31 sites. After 5 years of follow-up observation, the implant survival rate and the change in bone height achieved in the maxillary sinus over time were measured and analyzed via clinical examination and X-ray imaging. Results In the 74 implantation sites, the elevation height of the sinus floor was (6.64±1.32) mm and the bone height of the sinus floor was (3.35±1.29) mm 5 years after loading. No statistical difference was observed in the bone resorption of the implant neck between the RBH<4 mm and RBH≥4 mm groups. Meanwhile, a statistical difference was noted in the bone height obtained in the maxillary sinus between the two groups. Conclusion When RBH in the maxillary posterior tooth area was <4 mm, the simultaneous implantation of Bicon short implants with tSFE can achieve a high implant survival rate and bone gain in the maxillary sinus, but does not increase the absorption of the alveolar ridge bone.

    A Meta-analysis of the effect of non-surgical periodontal therapy on inflammatory factors in patients with chronic kidney disease and periodontitis
    Lai Jing, Bai Yuanliang, Bai Yin, Mei Jie, Zhang Zhiwei, Tang Wenjing, Huang Jiao
    West China Journal of Stomatology. 2020, 38(6):  672-680.  doi:10.7518/hxkq.2020.06.012
    Abstract ( 750 )   HTML ( 19 )   PDF(pc) (976KB) ( 658 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Objective A study was conducted to systematically evaluate the clinical efficacy of inflammatory factors in patients with chronic kidney disease and periodontitis after non-surgical periodontal therapy. Methods We searched the databases of CNKI, Wanfang, CBM, PubMed, Embase, and Cochrane Library from inception to December 2019. Two reviewers independently collected all literature related to inflammatory factors in patients with chronic kidney disease and periodontitis after non-surgical periodontal therapy. These factors include C-reactive protein (CRP), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α). The literature was screened according to the inclusion and exclusion criteria. The quality of the studies was strictly evaluated, and the data were extracted. The literature of randomized controlled trials in accordance with the standards was Meta-analyzed with Revman 5.3 software. Results Six randomized controlled trials were included. Compared with the control groups, the results of meta-analysis showed that non-surgical periodontal therapy significantly reduced the levels of CRP [MD=-0.58, 95%CI (-1.13, -0.02), P=0.04] and IL-6 [MD=-2.76, 95%CI (-5.15, -0.37), P=0.02] in these patients but not that of TNF-α [MD=-3.87, 95%CI (-8.79, 1.05), P=0.12]. Conclusion Simultaneous regular renal treatment and non-surgical periodontal therapy can help relieve the periodontal damage on patients with chronic kidney disease and periodontitis. Moreover, it can improve the status of some inflammatory factors. This finding is conducive to the control and treatment of chronic kidney disease and periodontitis and needs to be a focus of research and in clinical operation.

    Gene polymorphism in oral lichen planus
    Pan Yingxiao, Guo Dawei, Li Xin, Liu Hengyi, Lu Shulai
    West China Journal of Stomatology. 2020, 38(6):  681-686.  doi:10.7518/hxkq.2020.06.013
    Abstract ( 726 )   HTML ( 29 )   PDF(pc) (840KB) ( 716 )   Save
    References | Related Articles | Metrics

    Oral lichen planus (OLP) is a common chronic inflammatory disease of the oral mucosa. The prevalence rate of OLP in adults is 0.5%-2%. The etiology and pathogenesis of OLP are still unclear. The pathogenesis of OLP may be related to the genetic polymorphism of some genes. Currently, the gene families, including tumor necrosis factor, interferon, interleukin, enzyme, and receptor, have been extensively studied. This work reviews related studies on gene polymorphism of OLP.

    Advances in the application of machine learning in maxillofacial cysts and tumors
    Mei Hongxiang, Cheng Junhao, Li Yizhou, Ma Huangshui, Zhang Kaiwen, Shou Yuke, Li Yang
    West China Journal of Stomatology. 2020, 38(6):  687-691.  doi:10.7518/hxkq.2020.06.014
    Abstract ( 667 )   HTML ( 43 )   PDF(pc) (791KB) ( 838 )   Save
    References | Related Articles | Metrics

    The application of artificial intelligence in medicine has gradually received attention along with its development. Many studies have shown that machine learning has a wide range of applications in stomatology, especially in the clinical diagnosis and treatment of maxillofacial cysts and tumors. This article reviews the application of machine learning in maxillofacial cyst and tumor to provide a new method for the diagnosis of oral and maxillofacial diseases.

    Research progress on the biomimetic remineralization of hard tooth tissues based on polyamide-amine dendrimer
    Xiang Kezhen, Chen Liang, Yang Deqin
    West China Journal of Stomatology. 2020, 38(6):  692-696.  doi:10.7518/hxkq.2020.06.015
    Abstract ( 585 )   HTML ( 21 )   PDF(pc) (793KB) ( 509 )   Save
    References | Related Articles | Metrics

    Polyamide-amine (PAMAM) dendrimer, a new hyperbranched macromolecular polymer, is considered an “artificial protein” by many scholars on account of its excellent chemical and biological characteristics. PAMAM has internal cavities and a large number of reactive terminal groups. These structures allow the polymer to be used as a bionic macromoleculethat could simulate the biomimetic mineralization of the natural organic matrix on the surface of tooth tissue. Specifically, PAMAM can beused as an organic template to regulate mineral nucleation and crystal growth; thus, the polymerisa more ideal dental restoration material than traditional allogenic materials. This article reviews research progress on thePAMAM-induced biomimetic mineralization of hard tooth tissues.

    Research progress in the osteogenetic mechanism of strontium
    Zhong Ningying, Wang Liping
    West China Journal of Stomatology. 2020, 38(6):  697-703.  doi:10.7518/hxkq.2020.06.016
    Abstract ( 732 )   HTML ( 22 )   PDF(pc) (842KB) ( 438 )   Save
    References | Related Articles | Metrics

    Strontium (Sr) is an essential trace element and widely exists in nature. It plays an important role in the in vivo regulation of bone metabolism. Sr locates below Fe in the periodic table, and its chemical structure and polarity are similar to those of Ca. It can induce bone mesenchymal stem cells to differentiate into osteoblasts by inhibiting the activity of osteoclasts and reducing bone resorption. It promotes bone formation through a series of related pathways. The mechanism of Sr regulation of bone metabolism has been extensively researched in recent years. The current study aims to investigate the mechanism of Sr and provide a theoretical basis for its clinical application.

    Roles of autophagy onself-renewal and differentiation of mesenchymal stem cells
    Liu Xinchen, Lu Jinjin, Chen Yumeng, Qiu Ying, Zheng Mengdan, Wang Zilin, Li Xiangwei
    West China Journal of Stomatology. 2020, 38(6):  704-707.  doi:10.7518/hxkq.2020.06.017
    Abstract ( 619 )   HTML ( 12 )   PDF(pc) (810KB) ( 590 )   Save
    References | Related Articles | Metrics

    Mesenchymal stem cells (MSCs), which have the potential of self-replication and differentiation, are a very valuable cell source for stem cell-based medical therapy. Their application has opened up a new way for disease research. Although MSCs can maintain cell stemness through self-renewal, with the prolongation of cell passage and culture time, the stemness of MSCs gradually decays, and the cell aging and differentiation potential decreases gradually. Autophagy is a highly conserved cytological process that degrades the modified, excess, and deleterious cytoplasmic components in autophagosomes, which are then degraded by fusion with lysosomes. As the main intracellular degradation and recycling pathway, autophagy plays an active role in maintaining cell homeostasis, self-renewal and pluripotency. In this paper, the role of autophagy in self-renewal and maintenance of multidirectional differentiation potential of MSCs was reviewed, which laid a theoretical foundation and practical basis for the research and application of MSCs.

    Uprighting a mesially tilted mandibular second molar by using a dental implant as anchorage: a case report
    Zhou Jie, Gan Xueqi, Lu Jiayi, Fan Linli, Zhu Zhuoli
    West China Journal of Stomatology. 2020, 38(6):  708-711.  doi:10.7518/hxkq.2020.06.018
    Abstract ( 2179 )   HTML ( 95 )   PDF(pc) (2990KB) ( 1352 )   Save
    Figures and Tables | References | Related Articles | Metrics

    After tooth has been removed for a long time, adjacent teeth may tilt to occupy the edentulous space, leading to a break in the occlusal 3D equilibrium and a lack of restorative space. This case report presents a mandibular second molar uprighting with anchorage from a dental implant.

    Clinical pathway and preparation method of high-precision tooth shoulder platform
    Luo Tian, Li Junying, Yu Haiyang
    West China Journal of Stomatology. 2020, 38(6):  712-717.  doi:10.7518/hxkq.2020.06.019
    Abstract ( 4553 )   HTML ( 1150 )   PDF(pc) (1724KB) ( 8484 )   Save
    Figures and Tables | References | Related Articles | Metrics

    A clear shoulder platform that can be easily identified by doctors and technicians or machines (mouth scan and warehouse scan) is important to obtaining a good long-term and stable fixed prosthesis treatment effect. At present, the preparation of the shoulder platform is usually based on free hands, and the practical operation is mainly guided by experience. Moreover, no comprehensive and objective preoperative design, intraoperative verification, and final test are available. Thus, the accuracy of shoulder platform preparation needs to be improved. In this study, the clinical pathway of “three determination, three selection, and three steps” with high accuracy of preparation and the precise shoulder preparation method of “bur-tip guidance” are proposed in detail.

    Treatment strategy for pregnancy epulis
    Cheng Guoping, Ye Changchang, Tang Jing, Meng Shu, Wu Yafei, Ding Yi
    West China Journal of Stomatology. 2020, 38(6):  718-725.  doi:10.7518/hxkq.2020.06.020
    Abstract ( 3783 )   HTML ( 786 )   PDF(pc) (5893KB) ( 5574 )   Save
    Figures and Tables | References | Related Articles | Metrics

    Pregnancy epulis is a tumor-like lesion with high prevalence in China. The local lesion, the general condition of the pregnant patient, and the complications during treatment should be taken into consideration when making a treatment plan for pregnancy epulis. In this study, three representative pregnancy epulis cases were presented, and related studies at home and aboard were reviewed to summarize the etiology, differential diagnosis, treatment, and prevention of pregnancy epulis and share the clinical experience in the treatment of pregnancy epulis.