Objective To evaluate the effectiveness and safety of a computer-controlled periodontal ligament(PDL) injection system to the local soft tissues as the primary technique in endodontic access to mandibular posterior te...Objective To evaluate the effectiveness and safety of a computer-controlled periodontal ligament(PDL) injection system to the local soft tissues as the primary technique in endodontic access to mandibular posterior teeth in patients with irreversible pulpitis.Methods A total of 162 Chinese patients who had been diagnosed with irreversible pulpitis in their mandibular posterior teeth without acute infection or inflammation in the periodontal tissues were enrolled in this clinical study.The patients were divided into 3 groups according to the position of the involved tooth:the premolar group(PM,n=38),first molar group(FM,n=66),and second molar group(SM,n=58).All the patients received computer-controlled PDL injection with 4% articaine and 1∶100 000 epinephrine.Immediately after the injection,endodontic access was performed,and the degree of pain during the treatment was evaluated by the patients using Visual Analogue Scale for pain.The success rates were compared among the 3 groups.The responses of local soft tissues were evaluated 3-8 days and 3 weeks after the procedure.Results The overall success rate was 76.5%.There was a significant difference in success rates among the PM,FM,and SM groups(92.1%,53.0%,93.1%,respectively;χ2=34.3,P<0.01).Both the PM and SM groups showed higher success rates than that of the FM group(v=1,χ2=16.73,P<0.01;v=1,χ2=24.5,P<0.01).No irreversible adverse effects on the periodontal soft tissues at the injection sites were observed in the follow-up visits in any of the groups.Conclusion The computer-controlled PDL injection system demonstrates both satisfactory anesthetic effects and safety in local soft tissues as primary anesthetic technique in endodontic access to the mandibular posterior teeth in patients with irreversible pulpitis.展开更多
The periodontal ligament-derived mesenchymal stem cell is regarded as a source of adult stem cells due to its multipotency.However, the proof of chondrogenic potential of the cells is scarce.Therefore,we investigated ...The periodontal ligament-derived mesenchymal stem cell is regarded as a source of adult stem cells due to its multipotency.However, the proof of chondrogenic potential of the cells is scarce.Therefore,we investigated the chondrogenic differentiation capacity of periodontal ligament derived mesenchymal stem cells induced by transforming growth factor(TGF)-p3 and bone morphogenetic protein(BMP)-6.After isolation of periodontal ligament stem cells(PDLSCs) from human periodontal ligament,the cells were cultured in Dulbecco’s modified Eagle’s medium(DMEM) with 20%fetal bovine serum(FBS).A mechanical force initiated chondrogenic differentiation of the cells.For chondrogenic differentiation,10μg·LTGF-β3 or 100μg·LBMP-6 and the combination treating group for synergistic effect of the growth factors.We analyzed the PDLSCs by fluorescence-activated cell sorting and chondrogenesis were evaluated by glycosaminoglycans assay,histology,immunohistochemistry and genetic analysis.PDLSCs showed mesenchymal stem cell properties proved by FACS analysis.Glycosaminoglycans contents were increased 217%by TGF-β3 and 220%by BMP-6. The synergetic effect of TGF-β3 and BMP-6 were shown up to 281%compared to control.The combination treatment increased Sox9, aggrecan and collagen II expression compared with not only controls,but also TGF-P3 or BMP-6 single treatment dramatically.The histological analysis also indicated the chondrogenic differentiation of PDLSCs in our conditions.The results of the present study demonstrate the potential of the dental stem cell as a valuable cell source for chondrogenesis,which may be applicable for regeneration of cartilage and bone fracture in the field of cell therapy.展开更多
Objective: To observe osteogenetic rate of alveolar bone on the tension side in orthodontic tooth movement through distraction osteogenesis of the periodental ligament quantificationally. Methods: The experiment was c...Objective: To observe osteogenetic rate of alveolar bone on the tension side in orthodontic tooth movement through distraction osteogenesis of the periodental ligament quantificationally. Methods: The experiment was carried in 6 dogs. The left side of jaws of each one was set as test or control side, and the other side was control or test side. On the control side, the first premorlar was moved by traditional method on the test side. A self-made distraction device was used on the test side. The newly formed alveolar bone on the tension side of moved tooth was labeled by serial tetracycline fluorochrome. Sections were observed by fluorescence microscope and pictured. Newly formed bone was measured by computer image analysis. Results: The quantity of newly formed bone was significantly different between the two methods. Newly formed bone in rapid tooth movement by distraction osteogenesis of the periodental ligament was more than that in traditional method. Conclusion: The distraction through periodental ligament could induce more rapid bone formation and excite higher osteogenetic activity than traditional method.展开更多
目的:用不同序列Cp G ODN刺激牙周膜细胞(PDLCs),筛选对PDLC有促增殖作用的Cp G ODN序列,为Cp G ODN在牙周病治疗上的应用提供实验依据。方法:收集因正畸治疗需要而拔除的健康前磨牙48颗,年龄10～15岁。利用组织块原代培养法培养人PDLCs...目的:用不同序列Cp G ODN刺激牙周膜细胞(PDLCs),筛选对PDLC有促增殖作用的Cp G ODN序列,为Cp G ODN在牙周病治疗上的应用提供实验依据。方法:收集因正畸治疗需要而拔除的健康前磨牙48颗,年龄10～15岁。利用组织块原代培养法培养人PDLCs,取第4和5代细胞用于实验。实验组用1～12号Cp G ODN刺激PDLCs,分别培养24、48和72h,用PBS做对照组,MTT比色法检测吸光度A492值。结果:原代培养的PDLCs呈长梭形或星形,胞突细长,中央有圆形或椭圆型的胞核,抗波形丝蛋白染色阳性,抗角蛋白染色阴性,为中胚层来源细胞。与对照组比较,实验组Cp G ODN的A均值升高,其中9、11号Cp G ODN与对照组比较A值明显升高(P<0.05或P<0.01)。结论:Cp G ODN有促人PDLCs增殖作用,其中9、11号Cp G ODN可显著促进人PDLCs增殖。展开更多
文摘Objective To evaluate the effectiveness and safety of a computer-controlled periodontal ligament(PDL) injection system to the local soft tissues as the primary technique in endodontic access to mandibular posterior teeth in patients with irreversible pulpitis.Methods A total of 162 Chinese patients who had been diagnosed with irreversible pulpitis in their mandibular posterior teeth without acute infection or inflammation in the periodontal tissues were enrolled in this clinical study.The patients were divided into 3 groups according to the position of the involved tooth:the premolar group(PM,n=38),first molar group(FM,n=66),and second molar group(SM,n=58).All the patients received computer-controlled PDL injection with 4% articaine and 1∶100 000 epinephrine.Immediately after the injection,endodontic access was performed,and the degree of pain during the treatment was evaluated by the patients using Visual Analogue Scale for pain.The success rates were compared among the 3 groups.The responses of local soft tissues were evaluated 3-8 days and 3 weeks after the procedure.Results The overall success rate was 76.5%.There was a significant difference in success rates among the PM,FM,and SM groups(92.1%,53.0%,93.1%,respectively;χ2=34.3,P<0.01).Both the PM and SM groups showed higher success rates than that of the FM group(v=1,χ2=16.73,P<0.01;v=1,χ2=24.5,P<0.01).No irreversible adverse effects on the periodontal soft tissues at the injection sites were observed in the follow-up visits in any of the groups.Conclusion The computer-controlled PDL injection system demonstrates both satisfactory anesthetic effects and safety in local soft tissues as primary anesthetic technique in endodontic access to the mandibular posterior teeth in patients with irreversible pulpitis.
基金supported by the Bio & Medical Technology Development Program of the National Research Foundation(NRF) funded by the Korean government(MEST)(No.860-20110087)
文摘The periodontal ligament-derived mesenchymal stem cell is regarded as a source of adult stem cells due to its multipotency.However, the proof of chondrogenic potential of the cells is scarce.Therefore,we investigated the chondrogenic differentiation capacity of periodontal ligament derived mesenchymal stem cells induced by transforming growth factor(TGF)-p3 and bone morphogenetic protein(BMP)-6.After isolation of periodontal ligament stem cells(PDLSCs) from human periodontal ligament,the cells were cultured in Dulbecco’s modified Eagle’s medium(DMEM) with 20%fetal bovine serum(FBS).A mechanical force initiated chondrogenic differentiation of the cells.For chondrogenic differentiation,10μg·LTGF-β3 or 100μg·LBMP-6 and the combination treating group for synergistic effect of the growth factors.We analyzed the PDLSCs by fluorescence-activated cell sorting and chondrogenesis were evaluated by glycosaminoglycans assay,histology,immunohistochemistry and genetic analysis.PDLSCs showed mesenchymal stem cell properties proved by FACS analysis.Glycosaminoglycans contents were increased 217%by TGF-β3 and 220%by BMP-6. The synergetic effect of TGF-β3 and BMP-6 were shown up to 281%compared to control.The combination treatment increased Sox9, aggrecan and collagen II expression compared with not only controls,but also TGF-P3 or BMP-6 single treatment dramatically.The histological analysis also indicated the chondrogenic differentiation of PDLSCs in our conditions.The results of the present study demonstrate the potential of the dental stem cell as a valuable cell source for chondrogenesis,which may be applicable for regeneration of cartilage and bone fracture in the field of cell therapy.
基金Supported by the Youth Science Foundation of Stomatological Hospital, Xi'an Jiaotong University
文摘Objective: To observe osteogenetic rate of alveolar bone on the tension side in orthodontic tooth movement through distraction osteogenesis of the periodental ligament quantificationally. Methods: The experiment was carried in 6 dogs. The left side of jaws of each one was set as test or control side, and the other side was control or test side. On the control side, the first premorlar was moved by traditional method on the test side. A self-made distraction device was used on the test side. The newly formed alveolar bone on the tension side of moved tooth was labeled by serial tetracycline fluorochrome. Sections were observed by fluorescence microscope and pictured. Newly formed bone was measured by computer image analysis. Results: The quantity of newly formed bone was significantly different between the two methods. Newly formed bone in rapid tooth movement by distraction osteogenesis of the periodental ligament was more than that in traditional method. Conclusion: The distraction through periodental ligament could induce more rapid bone formation and excite higher osteogenetic activity than traditional method.
文摘目的:用不同序列Cp G ODN刺激牙周膜细胞(PDLCs),筛选对PDLC有促增殖作用的Cp G ODN序列,为Cp G ODN在牙周病治疗上的应用提供实验依据。方法:收集因正畸治疗需要而拔除的健康前磨牙48颗,年龄10～15岁。利用组织块原代培养法培养人PDLCs,取第4和5代细胞用于实验。实验组用1～12号Cp G ODN刺激PDLCs,分别培养24、48和72h,用PBS做对照组,MTT比色法检测吸光度A492值。结果:原代培养的PDLCs呈长梭形或星形,胞突细长,中央有圆形或椭圆型的胞核,抗波形丝蛋白染色阳性,抗角蛋白染色阴性,为中胚层来源细胞。与对照组比较,实验组Cp G ODN的A均值升高,其中9、11号Cp G ODN与对照组比较A值明显升高(P<0.05或P<0.01)。结论:Cp G ODN有促人PDLCs增殖作用,其中9、11号Cp G ODN可显著促进人PDLCs增殖。
