RSS Email Alert

20 August 2017, Volume 25 Issue 8
    

  • Select all
    |
    Expert Forum
  • Hong QIAN
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 477-481. https://doi.org/10.12016/j.issn.2096-1456.2017.08.001
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Traumatic dental injury (TDI) in children and adolescents has become one of the most serious problems in public health. TDI has relatively high prevalence, broad etiology, which may influence esthetic and function of involved teeth, resulting in economic loss and affecting life quality. The prevalence of TDI increases with children’s age. Males suffer from TDI more easily than females. Maxillary central incisors are most commonly affected. Luxation and enamel fracture are common types of TDI. The main causes of TDI include fall, collision, sport, violence and accident. Overjet, lip incompetency and caries may be risk factors of TDI. According to risk factors of TDI, appropriate prevention measures need to be taken, which is the key of preventing TDI.

  • Special Articles
  • Yi ZHENG, Zhuannong ZHAO, Yixi WANG, Yang CAO, Chufeng LIU
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 482-487. https://doi.org/10.12016/j.issn.2096-1456.2017.08.002
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To study the change of STAT1 expression in the anterior cingulate cortex on rats under orthodontic force, and to further explore the roles of STAT1 and related JAK-STAT1 signaling pathway in the mediation and regulation of pain during tooth movement. Methods 112 male Sprague-Dawley (SD) rats (225±25 g) were used in this study. They were randomly divided into experimental groups (96 rats) and control groups (16 rats). All rats were installed bilateral maxillary device for tooth movement models. Rats in the experimental groups were applied 80g orthodontic force on both sides and were divided into six subgroup 4 h, 12 h, 24 h, 2 d, 3 d, 7 d, with 16 rabbits in each subgroup. The control groups were only installed the same orthodontic devices, without the application of orthodontic force. Brain tissue of the anterior cingulate cortex was isolated after 4 h, 12 h, 24 h, 2 d, 3 d, 7 d since experiment, and the expression level of STAT1 and p-STAT1 was analyzed with the method of immunofluorescence and PCR. Results For the immunofluorescence result, there was significant difference in STAT1 expression between control groups and different experimental groups at different time points in total (P < 0.05). The STAT1 expression amount in the 4 h group decreased significantly when compared with the control group (P < 0.05); to the 2 d group, the difference is still statistically significant (P < 0.01). 3 d group, 7 d group and control group had no statistically significant difference. The STAT1 expression amount in 4 h group, 12 h group, 24 h group was significantly lower than that in 3 d and 7 d groups, differences were statistically significant (P < 0.05). The STAT1 expression in the 2 d group was significantly lower than that of 7 d (42.35 ± 5.77) group, the difference was statistically significant (P < 0.05). There was significant difference in p-STAT1 expression between control groups and different experimental groups at different time points in total (F = 623.518, P < 0.05). The p-STAT1 expression amount in experimental groups were higher than that in the control group (P < 0.05). The p-STAT1 expression in 4 h group was lower than that in 12 h and 24 h group and higher than that in 2 d, 3 d and 7 d groups, of which the differences were statistically significant (P < 0.05). The p-STAT1 expression in 12 h group was lower than that in 24 h group and higher than that in 2 d, 3 d and 7 d groups, of which the differences were statistically significant (P < 0.05). For the PCR result, the expression of mRNA in STAT1 of experimental groups of 4 h, 12 h, 24 h, 2 d, 3 d, 7 d and the control groups were not statistically significant (P > 0.05). Conclusions After applying orthodontic force, the expression of STAT1 decreased transiently and the expression of p-STAT1 increased transiently. The reduction of STAT1 was probably caused by the phosphorylation of STAT1 and decrease in the translation level of STAT1, rather than changes in the transcriptional levels. The orthodontic pain might be related with the activation of STAT1 into phosphorylated STAT1.

  • Basic Study
  • Jingwen PANG, Yalin WU, Ting XU, Xiumei ZHUANG
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 488-493. https://doi.org/10.12016/j.issn.2096-1456.2017.08.003
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To investigate the effects of hypoxia on osteogenic differentiation of periodontal ligament cells (PDLCs) and the role of hypoxia inducible factor-1α (HIF-1α) in this process. Methods Human PDLCs were isolated and identified by checking the expression of vimentin and cytokeratin. PDLCs were cultured in normoxia (20% O2) or hypoxia (1% O2) for 12-72 h. Changes of alkaline phosphatase (ALP) activity and mRNA expressions of osteogenic markers ALP, collagen-I (COL1) and runt related transcription factor 2 (RUNX2) were detected. Western blot was used to detect the expression of HIF-1α. After transfected with HIF1α-siRNA, the expressions of HIF-1αand osteogenic differentiation markers were furthered detected. The statistics were analyzed with SPSS13.0. Results Positive vimentin but negative cytokeratin were observed in primary cultured PDLCs. ALP activity and mRNA expressions of ALP, COL1 and RUNX2 were decreased in PDLCs in hypoxia for 48 h, while HIF-1α expression was increased. After knocking down of HIF-1α with siRNA, HIF-1α was significantly reduced in PDLCs under hypoxia, while ALP activity and mRNA expressions of osteogenic markers were significantly increased. Conclusion Hypoxia may inhibit osteogenic differentiation of PDLCs via upregulated HIF-1α.

  • Lei WAN, Haibin LU, Gang LUO
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 494-497. https://doi.org/10.12016/j.issn.2096-1456.2017.08.004
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To investigate the influence of different concentrations of CaCl2 on the hemolytic activity of candida strains. Methods A total of 25 candida strains were selected, including 21 candida strains recovered from clinical specimens, and 4 reference strains of C. albicans (ATCC 90028) (American Type Culture Collection, Manassas, VA, USA), C. glabrata (ATCC 90030), C. krusei (ATCC 6258), and C. tropicalis (ATCC 13803) respectively. CaCl2 was added at concentrations of 0%, 0.5%, 1% and 2.5 g % (wt/vol). Plates were cultured at 37 ℃ in a 5% CO2 atmosphere for 24-72 h, and the hemolytic index (Hi) was analyzed. Results comparsions of the hemolytic indices among the groups treated with 0.5% CaCl2 (Hi = 2.247 ± 0.079), 1% CaCl2 (Hi = 2.013 ± 0.092), 2.5% CaCl2 (Hi = 2.150 ± 0.066) and the control (Hi = 2.749 ± 0.103) reached statistical significance (P < 0.001). Conclusion CaCl2 may produce a decrease activity in the hemolysis of candida species.

  • Yingtao LV, Yuan SU, Weiqun MA, Shuying LIU, Pingping XU
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 498-500. https://doi.org/10.12016/j.issn.2096-1456.2017.08.005
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To establish an animal model that clinically conforms to the characteristics of severe alveolar ridge atrophy. Methods Beagle dogs were used as experimental subjects. Bilateral fourth premolars and first molars in mandible were extracted. A horizontal groove was made on alveolar ridge which was 8 mm from the cemento-enamal junction of mandible third premolar and second molar. Rongeur was used to remove the alveolar bone above this groove and bone chisel was used to level the bone-free area. A box-shaped defect cavity of the size 25 mm × 8 mm was formed with sterile silicone prosthesis implanted. After careful suture we waited for the subjects to heal naturally. Eight weeks after operation, CBCT examination was performed. Results Eight weeks after bone remodeling the top of alveolar ridge of operation area appeared to be a circular arc. The average distance from the bottom of the ridge to inferior alveolar nerve canal was 2.5 mm. Conclusion This study successfully established the Beagle dog animal model for severe alveolar ridge atrophy and laid the foundation for experiments on vertical bone augmentation.

  • Cinical Study
  • Xianwen LIU, Yunfeng LI, Yao LIU, Songsong ZHU
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 501-505. https://doi.org/10.12016/j.issn.2096-1456.2017.08.006
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective The present study was designed to evaluate the use of inverted-L osteotomy of ramus combined with iliac bone graft for the treatment of mandibular hypoplasia inadult patients. Methods Intraoral or extraoralinverted-L osteotomy of ramus and iliac crest bone grafting were used for the treatment of mandibular hypoplasia in 11 adult patients (aged 19 to 29 years) from 2010 to 2016. Data were collected from the patients’ records, photographs andradiographs. Results The height and width of the mandibular ramus were significantly augmented by inverted-L osteotomy and iliac crest bone grafting with minimal complications in all patients, resulting in remarkable improvements both in facial appearance and occlusion. Conclusions Our preliminary results showed that the inverted-L osteotomy of ramus and iliac crest bone grafting is safe and effective, and should be considered as a good alternative for the patients with mandibular hypoplasia.

  • Chengjun LIU, Yilong AI
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 506-509. https://doi.org/10.12016/j.issn.2096-1456.2017.08.007
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To find out the existence of Mandibular Incisive Canal (MIC) through CBCT scanning and measure its 3D relationship with the surrounding tissue, so as to provide protection for the operation in submental area. Methods CBCT images of 100 patients were measured and three dimensionally reconstructed. The measurement include following items, the existence of the MIC; vertical and horizontal diameter of MIC; vertical distance from MIC to the mandibular buccal and lingual wall; to the root apex, to the inferior border of mandible and alveolar crest in corresponding points (the mandibular first premolar, canine and incisor). Results the MIC was 100% visible in CBCT. The mean distance between MIC and buccal bone plate and lingual bone plate was 3.52 ± 0.54 mm and 5.37 ± 0.25 mm. The average distance from the inferior border of the mandible, the apex of the root and the crest of the alveolar bone was 10.44 ± 0.61 mm、10.57 ± 0.76 mm and 20.21 ± 0.83 mm relatively. The distance from MIC to the inferior border of the mandible in male was 10.70 ± 0.43 mm and 10.17 ± 0.63 mm in female, P<0.05. Conclusion The detection rate of MIC is high and there are many variations. It was suggested that the location and size of the MIC should be checked in CBCT in each patient before operation, which is helpful to avoid surgical complications in submental area.

  • Anyi CAO, Xiao YANG, Hongshan GE
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 510-514. https://doi.org/10.12016/j.issn.2096-1456.2017.08.008
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To investigate the relationship between the morphology of oropharyngeal airway and craniofacial morphology in high angle patient by cone beam CT images.Methods CBCT images of 60 high-angle adult patients were randomly selected in the Affiliated Stomatological Hospital of Nanchang University. The line distances, volumes and min cross-sectional areas of each part of oropharyngeal airway were measured by the InvivoDental 5.1 software. Pearson correlations analysis of all measurements was performed on all the parameters of oropharyngeal airway and maxillofacial structures.Results In male group, SNB showed positive correction with UTL, PPV, GPV, OPV, MinS. Thereas the GoGn-SN angle showed negative correction with UTL, ETL, PPV, GPV, OPV, MinS, S-Go/N-Me was positive correlated with UTL. In female group, SNA showed negative correction with PNSW. The SNB angle showed negative correction with GPH、PNSW、UTW, GoGn-SN showed positive correction with GPH. Conclusions In high angle adults, the morphology of oropharyngeal airway exist some degrees of correlation with the maxillofacial structures. In male group, the dimension of the oropharyngeal airway tend to increase with the forward of mandible, and tend to decrease or obstruct with the clockwise rotation of mandible. In female group, with the changes of position of maxilla and mandible, oropharyngeal airway showed only partial morhological change.

  • Yunting FU, Hongwen LI, Ruitian DU, Xiaoyan WANG, Jing JIANG, Senqing LIU
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 515-518. https://doi.org/10.12016/j.issn.2096-1456.2017.08.009
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To evaluate the clinical effect of two different resin cements on the glass fiber-reinforced posts. Methods One hundred and thirty-six teeth were randomly divided into two groups, with sixty-eight in each. Group A used Multilink N self-etch system and group B used RelyX Unicem self-adhesive system to bond fiber posts. Follow-up examinations took place at 6, 12 and 24 months after the placement. Results The success ratios of two groups were all 97% above and there was no significant difference between two groups (P > 0.05). Conclusion Multilink N self-etch system and RelyX Unicem self-adhesive system all have good effect on glass fiber-reinforced posts bonding.

  • Gongyuan LEI, Yilong AI, Wei WEI, Dahong HUANG, Wenping LUO, Peng LI
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 519-522. https://doi.org/10.12016/j.issn.2096-1456.2017.08.010
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To explore an efficient method for the establishment of three-dimensional (3-D) digital models of maxillofacial region including muscle tissue based on CT and MRI images fusion on a personal computer, integration of CT and MRI data, and provide accurate 3D model for biomechanical analysis. Methods A male volunteer was scanned on maxillofacial region by spiral CT and MRI. Two kinds of data obtained were imported into Mimics 15. In the three sections, namely the transverse, sagittal, coronal sections, two kinds of data were adjusted to the same anatomical layers. The most obvious anatomical points on each layer were selected as registration points. Then, the multi-points registration was implemented for data fusion. Then the bone and facial skin were segmented and 3D reconstructed using CT data, the main facial muscles were segmented and 3D reconstructed using MRI data. Results The 3D model including 3 pairs of masticatory muscles, 12 pairs of facial expression muscles, facial skin and jaw tissues were established. Conclusion The efficient registration and fusion of CT and MRI datas were accomplished. Moreover, this method can be used for further segmentation and reconstruction of other important structures in craniofacial area, such skin, blood vessel, fat, lymph node and the brain tissues.

  • Feng WU, Junfang LI, Zhen WANG, Zhenyu NI, Hong HE
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 523-529. https://doi.org/10.12016/j.issn.2096-1456.2017.08.011
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To evaluate the effects and clinical application of molar intrusion with a new mandibular molar intrusion appliance.Methods 7 patients who needed mandibular molars intrusion to correct open-bite were selected. To evaluate effects of molar intrusion, clinical examination, dental model analysis and aphalometric analysis by Winceph 7.0 software were used before and after intrusion treatment, SPSS 17.0 software was used for data analysis. Results All the mandibular molars were intruded successfully in an average time of 4.0 months. Cephalometric analysis before and after treatment showed that the average amount of mandibular first molars intrusion were (1.92 ± 0.44) mm.The vertical distance to the reference plane (MP plane) per and post treatment was statistically significant (P < 0.05). The average amount of maxillary first molar intrusion was (0.36 ± 0.25) mm, with no significant difference in vertical distances to reference plane (PP plane) (P > 0.05). No signs of root resorption was obsersed in radiograph of the intruded mandibular molars. Conclusion The new mandibular molar intrusion appliance has a remarkable clinical effect in correcting anterior open bite without obvious periodontal tissue damage and root resorption. teeth intrusion with the new appliance has a significant effect without apparent destruction of the periodontal tissue and root resorption.

  • Prevention and Treatment Practice
  • Xiantao ZENG, Xinhui YAO, Hongwen LI, Xiaorui GENG
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 530-532. https://doi.org/10.12016/j.issn.2096-1456.2017.08.012
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To explore the influence of different cement spaces on the marginal adaptation of CAD/CAM zirconia inlay. Methods 30 teeth extracted for orthodontic purpose were selected and divided into 3 groups (Group A 10 μm, Group B 30 μm, Group C 50 μm). The marginal spaces of inlays were recorded by the light-body Silicone impression material, and measured by microscope. The data were analyzed by SPSS 13.0. Results All the inlays fitted very well and all the marginal spaces were less than 120 μm. The shoulder of Group A was statistically lower than Group B and Group C (P < 0.05). The axial surface of Group B was statistically lower than Group C (P < 0.05). Conclusions CEREC zirconia inlay is satisfactory when the cement space is between 10-50 μm.

  • Darong ZHANG Deying ZOU Kangyuan. CHEN Jueqing GUAN
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 533-536. https://doi.org/10.12016/j.issn.2096-1456.2017.08.013
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To compare the clinical effects of polymer ceramic onlay and all ceramic crown in short crown molars. Methods 45 cases of polymer ceramic onlay and 45 cases of Zirconium dioxide all ceramic crowns which repaired the short crowm molars after root canal therapy were compared clinically from the aspects of beauty of restoration, fracture and dislodgement, marginal adaptation and the preservation of abutment teeth. Results One polymer ceramic onlay had fall out form the teeth after half year, while the all ceramic crowns have been 8 cases after 6~12 months. There were significant differences in fracture and dislodgement between the two groups (χ2=4.44, P < 0.05). Conclusion Polymer ceramic onlay has good clinical effects in the restoration of short crown molars.

  • Xiuli ZHANG, Xiaochuan XU, Yuan YAO, Yunsheng LI
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 537-540. https://doi.org/10.12016/j.issn.2096-1456.2017.08.014
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective The aim of this study is to investigate the periodontal status of senior high school students in Dongcheng District, Beijing. Methods 750 Beijing senior high school students were recruited in this study. The periodontal examination assessed the calculus, bleeding on probing, probing depth, and clinical attachment loss. The prevalences of gingivitis and periodontitis were assessed. Results A total of 73.5% of the subjects had gingivitis, the prevalences of gingivitis in male and female were 76.7% and 69.2% respectively. The prevalence of periodontitis was 10.9% in total, with 11.8% in male and 9.8% in female respectively. Conclusion The prevalence of gingivitis was high in senior high school students, and significantly higher in male. The prevalence of periodontitis was relatively low, and there was no difference in gender.

  • Mei DENG, Meier ZHAO, Qide LUO, Xiuchang ZHANG
    Journal of Prevention and Treatment for Stomatological Diseases. 2017, 25(8): 541-544. https://doi.org/10.12016/j.issn.2096-1456.2017.08.015
    Abstract ( ) Download PDF ( ) HTML ( )   Knowledge map   Save

    Objective To study and compare the recurrence rate of wisdom tooth pericoronitis and impacted tooth types of Yunnan college ethnic student. Methods 549 cases of pericoronitis of wisdom tooth from Yunnan college ethnic students were randomly selected by recording clinical symptom, recurrence situations and impacted tooth types by professional dentists, then clinical data was statistical analyzed. Results Most of pericoronitis (58.65%) was caused by vertical impaction of mandibular wisdom tooth. There was no significant difference (P>0.05) between Han ethnic groups and Minority ethnic groups of impacted tooth types. But there was significant difference (P<0.01) between Han ethnic groups and Minority ethnic groups of pericoronitis of wisdom tooth and recurrence rate. Conclusions There was higher rate of incidence and recurrence rate of pericoronitis of minority students.