基于Bark域的电子耳蜗频带划分分析和拟合研究

目前电子耳蜗主流的言语处理策略是基于滤波器组的言语处理算法，该算法通过分频带进行信号处理并把参数传递到对应的电极上。电子耳蜗滤波器组的频带划分不是等分的，而是按一定规律进行并且符合人耳听觉特性的，其中，Bark域的频带划分是重要的参考。本研究基于Bark域的电子耳蜗频带划分方法，探讨Bark域频带划分的特性并结合目前的电子耳蜗滤波器组的频带划分进行分析，进而探讨频带划分中的曲线拟合方法，为电子耳蜗滤波器组中的频带划分提供重要的方法和参数。     

Mechanical ear and “blue book” in 1973

Cochlear implant has progressively become an essential treatment for profound hearing loss. The aim of this historical note is to briefly review the very beginnings of this technique, in 1973, with the production of a painting entitled “Mechanical ear” and the first international congress on cochlear implants. In a way, these two events marked the beginning of an antagonism that played a very important role in the development and especially the acceptance of cochlear implants in the multicultural society of the late twentieth century.     

Survival and complications: A 9- to 15-year retrospective follow-up of dental implant therapy

Long-term follow-up of oral implant therapy seldom report all biological and technical complications. The objective of this study was to evaluate the long-term (9-15 years) outcome after dental implant therapy, assess survival and complication rates. In addition, to identify the risk indicators of these complications at patient and implant levels. Patients (n = 376) treated with dental implants (n = 1095) between 1999 and 2005 at a specialist clinic in Stockholm, Sweden, were included. Longitudinal data were collected retrospectively from digital dental records. A subset of the included patient underwent a clinical examination at the 9-15 years follow-up (n = 163). Chi-square tests, Kaplan-Meier analyses and the general estimating equations (GEE) procedure were adopted for multilevel analyses. The cumulative implant survival rate up to 15 years was 82.6% (SE 4.1%). The prevalences of biological and technical complications at patient level were 52% and 32%, respectively. In total, 763 complications occurred, 65% of patients experienced at least one complications. Implant loss occurred significantly more frequently in subjects with a history of treated severe periodontitis Stage III-IV (P = .008) and in cases when complications were registered during implant surgery (P = .010). Smoking was a significant risk indicator for peri-implantitis (P = .006). The long-term implant survival and complication rates at patient level were 83% and 79%, respectively. Implant loss was significantly more frequent for subjects with a history of treated severe periodontitis and if complication was registered during implant surgery. Smoking was a significant risk indicator for peri-implantitis.     

Five-year survival rates for implants placed using digitally-designed static surgical guides: a systematic review

Digitally-designed static surgical guides provide an acceptable level of accuracy and predictability for the placement of dental implants. However, to our knowledge, few published studies have compared the long-term survival of implants placed in this way with those placed using other methods. A systematic search of electronic databases using a population, intervention, comparison, and outcome (PICO) framework was conducted of Medline and EMBASE, as well as grey literature and hand searches, to obtain all relevant work pertaining to the survival of dental implants placed by guided surgery. The studies were required to have at least 10 patients with a follow up of at least five years. A total of 621 titles were screened. Four studies met the inclusion criteria for quantitative analysis, and they all reported the exclusive use of Nobel Biocare implants and the NobelGuide system (Nobel Biocare Services). Cumulative survival rates ranged from 94.5% to 100% over five years. The survival rates of implants placed using digitally-designed static surgical guides are comparable to the estimated overall survival rate (95.6% over five years), despite the complex nature of the treatments done with guided surgery. Clinicians who do these operations should, however, have the experience and ability to revert to conventional freehand techniques if complications arise.     

不同根管填充程度对牙体牙髓患者治疗的影响效果观察

目的:分析不同根管填充程度对牙体牙髓患者治疗的影响效果。方法:选取本院2018年4月~2019年4月接收的76例牙体牙髓病患者作为研究对象,76例患者均采用根管填充进行治疗,共治疗患牙120颗。将120颗患者基于治疗后X线片显示的填充程度不同将其分为观察组1、观察组2、观察组3,每组患牙40例,观察组1为欠充治疗,观察组2为适充治疗,观察组3为超充治疗,观察这三组患牙的治疗有效率。结果:观察组2中治疗显效27例、治疗有效10例,总治疗有效率为92.50%(37/40);观察组3中治疗显效16例、治疗有效12例,总治疗有效率为70.00%(28/40);观察组1中治疗显效13例、治疗有效10例,总治疗有效率为57.50%(23/40),三组之间差异均具有统计学意义(P<0.05)。结论:对于牙体牙髓患者采用根管填充进行治疗时,采用适充可以取得更好的治疗效率。