I Do Biotech Dental Implants: Prospective Multicentric Study after 5 Years of Functional Loading

Introduction: I Do Biotech’s implants were developed starting in 2014. Since then, they obtained GMP and KFDA licenses for distribution in 2015. The main objective of this paper is to determine the survival rate of I Do Biotech implants five years after the first surgery. Material and Methods: 1000 implants were used on 480 prostheses across 10 clinics on 320 healthy, non-smoker and non-diabetic patients, chosen at random, of which 160 are male and 160 female, all in the age range of 30 to 50 years old. The failure rate was studied related to the patient’s gender, the length and diameter of the implant, anatomical location, the percentage of peri-implantitis, prosthodontic failures and the patient’s quality of life. Discussion: The results obtained are similar to those of Van Steenberghe D. Dieter-Busenlechner, E. Serrano Catauria and far superior to those of Sáenz Guzmán. Failure rates vary greatly from study to study due to the heterogeneity of the samples in the other research papers. Conclusion: The overall implant failure rate at 5 years is 1.7%. The factors affecting significantly the survival rate are: the implant diameter, its length and the anatomic area. Failure ratios increase significantly when the diameter or the length of the implant decreases, and when they are placed in the posterior maxilla (up to 4.3%). The rate of peri-implantitis is 5.1%. The prosthodontic failure rate is 2.91%. The improvement in quality of life and satisfaction increases with the years.

一种大孔径工件机床辅助支撑装置十字顶尖的设计与应用

现有的机床顶尖结构单一,多适用于较小工件加工时的辅助支撑,对于大孔径工件无法实现辅助支撑。为了解决大孔径工件的辅助支撑问题,根据撑杆原理设计了一种可以辅助支撑大孔径工件的十字顶尖,该顶尖由四个可调撑杆调节支撑范围,精密螺纹连接控制精度,十字对称结构保证刚度并能自适应内孔圆度,不仅可以辅助支撑内孔,还可以用于辅助矫正零件装夹,目前已经在部分企业推广应用,效果良好。

乳化液泵曲轴箱平面磨削装置的研究与应用

乳化液泵在日常运行中曲轴箱的吸液口周围表面会出现不同程度的麻点和小坑破坏现象,致使乳化液泵密封性能降低出现泄压现象,直接影响工作面液压支架的正常运转,严重时泄压会造成人员伤害。现有的修复工艺是对损坏的箱体补焊后进行手工打磨,依赖于职工个人技能和工作经验,很难获得较高的维修质量和维修效率。针对曲轴箱的结构形式、使用要求以及现有加工机械设备情况,在技改消缺、修旧利废、节支降耗等方面进行探索创新,制作了一套乳化液泵曲轴箱平面磨削装置,介绍了其主要构造和修复流程,并对关键部件进行了分析。实际应用表明,经过平面研磨装置修复的曲轴箱体均符合原设备的各项技术参数标准,提高了设备的修复质量和修复效率,延长了设备的使用寿命。

改造莫氏锥柄钻夹头工艺研究

热轧钢板由于受其工艺因素的制约,钢板表面大多会存在一定的缺陷,其中有一部分缺陷要用人工手持角磨机进行打磨作业。然而该打磨方式环境恶劣,打磨成本居高不下、劳动效率低下。文章针对这一问题,模拟角磨机工作原理针对钻铣床的莫氏锥柄钻夹头进行改造,以供参考。