氧化锆全瓷和金属烤瓷冠修复对牙冠延长术后牙周状况的影响

目的:研究氧化锆全瓷和金属烤瓷冠修复对牙冠延长术后牙周状况的影响,为临床治疗提供依据。方法:选取2014年12月到2015年2月我院收治牙冠延长术联合牙冠修复治疗患者210例,按照随机数字表法将患者分为研究组和对照组,每组105例,研究组应用氧化锆全瓷,对照组应用金属烤瓷,比较两组牙周情况、佩戴修复体时间和康复时间。结果:研究组正常者比例为83.81%(88/105)显著高于对照组的65.71%(69/105),轻度病损者比例为8.57%(9/105)显著低于对照的21.90%(23/105),比较差异具有统计学意义(P0.05);研究组术后佩戴修复体时间和康复时间均显著短于对照组,比较差异具有统计学意义(P0.05)。结论:应用氧化锆全瓷修复能改善牙冠延长术后患者牙周情况,缩短佩戴修复体时间和康复时间。     

Influence of Different Abutment Designs on the Biomechanical Behavior of One-Piece Zirconia Dental Implants and Their Surrounding Bone: A 3D-FEA

BackgroundIn a dental implant/bone system, the design factors affect the value and distributions of stress and deformations that plays a pivotal role on the stability, durability and lifespan of the implant/bone system.ObjectiveThe aim of this study was to compare the influence of different abutment designs on the biomechanical behavior of one-piece zirconia dental implants and their surrounding bone tissues using three-dimensional finite element analysis.MethodsA three-dimensional geometrical model of a zirconia dental implant and its surrounding bone tissue were created. The occlusal loading force applied to the prosthetic abutments was a combination of 114.6 N in the axial direction, 17.1 N in the lingual direction and 23.4 N toward the mesial direction where these components represent masticatory force of 118.2 N in the angle of approximately 75° to the occlusal plane.ResultsThe system included implant abutment Model 01 showed a decrease of 9.58%, 9.92% and 3.62% at least in the average value of maximum von Mises stress compared to Model 02, Model 03 and Model 04 respectively. The results also showed that the system included implant abutment Model 01 decreases the average value of maximum deformation of 16.96%, 7.17% and 9.47% at least compared to Model 02, Model 03 and Model 04 respectively.ConclusionThe one-piece zirconia dental implant abutment Model 01 presents a better biomechanical behavior in the peri-implant bone than others. It can efficiently distribute the applied load and present more homogeneous behavior of stress distribution and has less deformation than others, which will enhance the stability of implant/bone system and prolong its lifespan.     

The impact of Cu atoms on the reactivity of ZrO2 oligomers

A theoretical study on (ZrO₂) _n (n = 1–5) and Cu/ZrO₂ oligomers is presented, DFT/B3LYP/6-31G** calculations along with Lanl2DZ pseudopotentials on metallic centers have been used to predict ionization potentials and electron affinities, chemical potentials and bandgaps indicating that the reactivity reaches reasonably constant values at n = 5. The effect of copper atoms adsorbed on (ZrO₂) _n is discussed and the reactivity of oligomers of ZrO₂ and Cu/ZrO₂ are compared, results indicate that Cu activates the systems by localizing the specific nucleophilic and electrophilic reactivity.     

氧化锆全瓷修复与金属烤瓷修复对牙体缺损的修复效果及对牙周组织的影响

摘要 目的：探讨与对比氧化锆全瓷修复与金属烤瓷修复对牙体缺损的修复效果及对牙周组织的影响。方法：2017年5月到2019年3月选择在本院进行诊治的牙体缺损患者112例,根据随机信封抽签原则把患者分为观察组与对照组,各56例。观察组使用氧化锆全瓷修复,对照组给予金属烤瓷修复治疗,记录修复效果及对牙周组织的影响。结果：修复后6个月观察组的修复体边缘密合度、颜色与形态评价合格率分别为98.2 %、100.0 %和94.6 %,都显著高于对照组的87.5 %、89.3 %和76.8 % (P<0.05)。两组修复后6个月的探诊深度(Pocket depths,PD)与牙龈指数(Gingi valindex,GI)值都高于修复前,观察组高于对照组(P<0.05)。两组修复后6个月的龈沟液肿瘤坏死因子(Tumor necrosis factor,TNF)-α与白介素(Interleukin,IL)-8值低于治疗前,观察组低于对照组(P<0.05)。观察组修复后6个月的牙龈炎、修复体断裂、继发龋等并发症发生率为7.1 %,显著低于对照组的25.0 % (P<0.05)。结论：相对于金属烤瓷,氧化锆全瓷修复牙体缺损能减少对牙周组织的影响,能抑制炎症因子的释放,从而提高修复效果,减少并发症的发生。     

Heterogeneous solid base nanocatalyst: preparation, characterization and application in biodiesel production

A solid base nanocatalyst was prepared by ZrO₂ loaded with C₄H₄O₆HK and investigated for transesterification of soybean oil with methanol to biodiesel. The obtained nanocatalyst was characterized by means of XRD, FTIR, TEM, TGA, N₂ adsorption-desorption measurements and the Hammett indicator method. TEM photograph showed that the nanocatalyst had granular and porous structures with particle sizes of 10-40 nm. The nanocatalyst had longer lifetime and maintained sustained activity after being used for five cycles. The separate effects of the molar ratio of methanol to oil, reaction temperature, nanocatalyst amount and reaction time were investigated. The experimental results showed that a 16:1 M ratio of methanol to oil, 6.0% catalyst, 60 °C reaction temperature and 2.0 h reaction time gave the best results and the biodiesel yield of 98.03% was achieved. Production of biodiesel has positive impact on the utilization of agricultural and forestry products.     

氧化锆全瓷修复与金属烤瓷修复在前牙牙冠延长术后冠修复中的应用效果比较

目的:比较氧化锆全瓷修复与金属烤瓷修复在前牙牙冠延长术后冠修复中的应用效果及安全性。方法:选取2016年7月~2018年7月我院收治的择期行前牙牙冠延长术后冠修复的患者80例(共97颗上颌牙),采用随机数字表法将患者分为两组,对照组40例(48颗患牙)采用金属烤瓷修复,观察组40例(49颗患牙)采用氧化锆全瓷修复。比较两组患者的牙体修复效果和牙周修复效果,治疗前后龈沟出血指数(sulcus bleeding index,SBI)、松动度(movable degree,MD)和菌斑指数(plaque index,PI)的变化以及不良反应的发生情况。结果:治疗后,观察组临床治疗总有效率显著高于对照组(87.76%vs.70.83%,P<0.05);观察组患者的边缘密合度、牙体折损、牙体颜色和牙龈健康状况均显著优于对照组(P<0.05);两组患者治疗后的SBI、MD和PI均较治疗前显著下降,且观察组以上指标显著低于对照组(P<0.05)。观察组患者不良反应发生率显著低于对照组(P<0.05)。结论:氧化锆全瓷修复用于前牙牙冠延长术后冠修复的临床效果显著优于金属烤瓷修复,且安全性更高。     

Chitosan scaffolds containing silicon dioxide and zirconia nano particles for bone tissue engineering

A scaffold harboring the desired features such as biodegradation, biocompatibility, porous structure could serve as template for bone tissue engineering. In the present study, chitosan (CS), nano-scaled silicon dioxide (Si) and zirconia (Zr) were combined by freeze drying technique to fabricate a bio-composite scaffold. The bio-composite scaffold (CS/Si/Zr) was characterized by SEM, XRD and FT-IR studies. The scaffold possessed a porous nature with pore dimensions suitable for cell infiltration and colonization. The presence of zirconia in the CS/Si/Zr scaffold decreased swelling and increased biodegradation, protein adsorption and bio-mineralization properties. The CS/Si/Zr scaffold was also found to be non-toxic to rat osteoprogenitor cells. Thus, we suggest that CS/Si/Zr bio-composite scaffold is a potential candidate to be used for bone tissue engineering.     

Production and purification of a chimeric monoclonal antibody against botulinum neurotoxin serotype A

Production of recombinant antibodies against botulinum neurotoxin is necessary for the development of a post-exposure treatment. CHO-DG44 cells were transfected with a plasmid encoding the light and heavy chains of a chimeric monoclonal antibody (S25) against botulism neurotoxin serotype A. Stable cell lines were obtained by dilution cloning and clones were shown to produce nearly equivalent levels of light and heavy chain antibody by an enzyme-linked immunosorbent assay (ELISA). In suspension culture, cells produced 35 μg/ml of chimeric antibody after 6 days, corresponding to a specific antibody productivity of 3.1 pg/cell/day. A method for the harvest and recovery of an antibody against botulism neurotoxin serotype A was investigated utilizing ethylenediamine-N,N′-tetra(methylphosphonic) acid (EDTPA) modified zirconia and MEP-hypercel, a hydrophobic charge interaction chromatography resin. Purification of the S25 antibody was compared to that achieved using rProtein A–Sepharose Fast Flow resin. After the direct load of culture supernatant, analysis by ELISA and gel electrophoresis showed that S25 antibody could be recovered at purities of 41 and 44%, from the EDTPA modified zirconia and MEP-hypercel columns, respectively. Although the purity obtained from each of these columns was low, the ability to withstand high column pressures and nearly 90% recovery of the antibody makes EDTPA modified zirconia well suited as an initial capture step. Combining the EDTPA modified zirconia and HCIC columns in series resulted in both purity and final product yield of 72%.     

纤维桩、纳米复合树脂结合氧化锆烤瓷冠对根管治疗后后牙楔状缺损患者美学效果及牙周组织的影响

摘要 目的：探讨纤维桩、纳米复合树脂结合氧化锆烤瓷冠对根管治疗后后牙楔状缺损患者美学效果及牙周组织的影响。方法：选取2018年1月至2019年3月期间我院收治的103例患者作为研究对象,按修复材料的不同分为对照组（n=52,患牙62颗）和研究组（n=51,患牙63颗）。对照组给予金属桩核、金属烤瓷冠修复,研究组给予纤维桩、纳米复合树脂结合氧化锆烤瓷冠修复。修复1年后,评价两组的修复成功率和修复效果。比较两组修复前及修复后1年的牙龈指数、菌斑指数、牙周探诊深度、龈沟液量及龈沟液中碱性磷酸酶（ALP）、天门冬氨酸转氨酶（AST）水平。结果：研究组的修复成功率比对照组高（P<0.05）。研究组修复体的表面光滑率、边缘密合性、固定良好率及颜色匹配率均明显高于对照组（P<0.05）。两组治疗后牙龈指数、菌斑指数及牙周探诊深度均明显低于治疗前（P<0.05）,龈沟液量及龈沟液中ALP、AST水平均明显低于治疗前（P<0.05）,同时研究组治疗后牙龈指数、菌斑指数及牙周探诊深度均低于对照组（P<0.05）,但两组治疗后龈沟液量及龈沟液中ALP、AST水平比较无差异（P>0.05）。结论：纤维桩、纳米复合树脂结合氧化锆烤瓷冠对根管治疗后后牙楔状缺损的修复成功率高,修复后美学效果佳,对牙周组织影响小。     

氧化锆强化硅酸锂玻璃陶瓷与Lava UItimate优韧瓷嵌体修复根管治疗后大面积缺损牙的咀嚼能力和外观的比较研究

摘要 目的：探究氧化锆强化硅酸锂玻璃陶瓷与Lava UItimate优韧瓷嵌体修复根管治疗后大面积缺损牙的咀嚼能力和外观的效果。方法：选择298例牙缺损患者随机分为观察组和对照组2组,其中观察组患者给与Lava UItimate优韧瓷嵌体修复治疗,对照组给与氧化锆强化硅酸锂玻璃陶瓷嵌体修复治疗。对比分析两组患者修复效果、咀嚼能力、外观变化、牙龈指数和菌斑指数、修复满意度以及并发症发生率。结果：观察组患者修复的完整度为99.33 %,颜色匹配度为97.32 %,边缘适合性为98.66 %,均显著高于对照组的77.18 %、65.77 %和67.11 %（P<0.05）。修复后,观察组患者的咀嚼能力、外观变化显著优于对照组（P<0.05）,PLI和GI显著低于对照组（P<0.05）。并且,观察组患者对修复的总满意度为99.33 %,显著高于对照组的82.55 %（P<0.05）,并发症发生率为2.01 %,显著低于对照组的29.53 %（P<0.05）。结论：Lava UItimate优韧瓷嵌体修复根管治疗后大面积缺损牙的咀嚼能力和外观的效果较氧化锆强化硅酸锂玻璃陶瓷好,可显著降低并发症发生率,提高患者满意度,值得临床推广使用。