Customised 3D Printing: An Innovative Training Tool for the Next Generation of Orbital Surgeons

Additive manufacturing or 3D printing is the process by which three dimensional data fields are translated into real-life physical representations. 3D printers create physical printouts using heated plastics in a layered fashion resulting in a three-dimensional object. We present a technique for creating customised, inexpensive 3D orbit models for use in orbital surgical training using 3D printing technology. These models allow trainee surgeons to perform ‘wet-lab’ orbital decompressions and simulate upcoming surgeries on orbital models that replicate a patient's bony anatomy. We believe this represents an innovative training tool for the next generation of orbital surgeons.     

选择性激光熔覆(SLM)钛合金可摘局部义齿支架的适合性研究

目的:评价选择性激光熔覆(SLM)技术制作的钛合金可摘局部义齿的适合性.方法:用选择性激光熔覆(SLM)技术制作7 个肯氏Ⅲ类Ti-6Al-4V可摘局部义齿支架,采用光学扫描仪分别扫描通过"印模法"得到的粘附有硅橡胶薄膜的石膏模型,以及去除该薄膜的石膏模型的光学印模,导入Geomagic Qualify软件,通过3D比较功能分析支架大连接体组织面与模型之间的间隙,对其适合性进行评价.结果:钛合金支架与模型之间的总体3D偏差值为(0.221 9±0.07) mm.结论:SLM技术制作的钛合金可摘局部义齿支架的适合性基本满足临床要求.     

The effect of 4,4'-bis(N,N-diethylamino) benzophenone on the degree of conversion in liquid photopolymer for dental 3D printing

PURPOSE

The purpose of this preliminary study was to investigate the effects of adding 4,4''-bis(N,N-diethylamino) benzophenone (DEABP) as a co-initiator to a binary photoinitiating system (camphorquinone-amine) to analyze on the degree of conversion (DC) of a light-cured resin for dental 3D printing.

MATERIALS AND METHODS

Cylindrical specimens (N=60, n=30 per group, ø5 mm × 1 mm) were fabricated using bisphenol A glycerolate dimethacrylate (BisGMA) both with and without DEABP. The freshly mixed resins were exposed to light in a custom-made closed chamber with nine light-emitting diode lamps (wavelength: 405 nm; power: 840 mW/cm²) for polymerization at each incidence of light-irradiation at 10, 30, 60, 180, and 300 seconds, while five specimens at a time were evaluated at each given irradiation point. Fourier-transform infrared (FTIR) spectroscopy was used to measure the DC values of the resins. Two-way analysis of variance and the Duncan post hoc test were used to analyze statistically significant differences between the groups and given times (α=.05).

RESULTS

In the DEABP-containing resin, the DC values were significantly higher at all points in time (P<.001), and also the initial polymerization velocity was faster than in the DEABP-free resin.

CONCLUSION

The addition of DEABP significantly enhanced the DC values and, thus, could potentially become an efficient photoinitiator when combined with a camphorquinone-amine system and may be utilized as a more advanced photopolymerization system for dental 3D printing.     

子宫托治疗女性盆腔器官脱垂并发症的研究

盆腔器官脱垂（pelvic organ prolapse,POP）是部分老年女性面临的问题,且发病率逐年升高,子宫托治疗是该疾病的一种保守治疗方法,也是一线治疗方法。但如果使用不当,治疗过程中也可能会出现多种并发症,严重者不得不需要手术干预,有的甚至会威胁生命。目前国际上关于子宫托治疗缺乏统一指南,治疗操作不规范和患者依从性差与并发症发生密切相关。总结归类运用子宫托治疗的相关并发症,介绍一种子宫托相关并发症的评级方法,针对并发症的预防提出了部分解决方法。     

印字水松纸的毒性及致突变研究

目的对印字水松纸进行安全性评价。方法通过急性毒性试验、骨髓细胞微核试验、骨髓细胞染色体畸变试验、精子畸形试验、Ames试验和30d喂养试验对印字水松纸进行安全性评价。结果①急性毒性试验显示印字水松纸的LD50〉21．5g／kgBW；②骨髓细胞微核试验、骨髓细胞染色体畸变、精子畸形试验、Ames试验均为阴性结果；③30d喂养试验结果显示印字水松纸未见毒性反应。未见体内蓄积中毒。结论即字水松纸在所试务件下属无毒级，无致突变作用、无明显体内蓄积毒性。     

MF多功能涂料印花粘合剂的合成及应用性能研究

研究了氧化－还原引发体系乳液聚合的工艺，确定了反应温度、时间、引发剂用量等参数。通过印花效果等性能测试，验证了ＭＦ为多功能粘合剂。