自体刃厚头皮片移植厚中厚皮片供区以抑制瘢痕增生

目的:探讨应用自体刃厚头皮片移植厚中厚皮片供区以抑制瘢痕增生的可行性及应用效果。方法:烧伤后全身大范围的增生性瘢痕患者24例,行功能部位的增生性瘢痕切除,应用非功能部位的大张厚中厚皮片修复,厚中厚皮片供区应用刃厚头皮片移植修复。结果:24例患者非功能部位厚中厚皮片供区经刃厚头皮片移植后,未见有明显的瘢痕增生。经随访半年至2年11例,2年以上3例,均未见有明显的瘢痕增生。头皮片供区无瘢痕形成,头发生长良好。结论:应用自体刃厚头皮片移植厚中厚皮片供区抑制瘢痕增生是一种可行的方法,值得临床推广。     

The effect of central corneal thickness on estimates of the anterior chamber depth

Background: The slitlamp can be used to estimate the anterior chamber depth (ACD). The length of a slit object is increased until the corneal and iris/lens images appear to just touch. Multiplying the just‐touching‐slit‐length (JTSL) by a conversion factor gives an estimate of the ACD as measured by ultrasonography. The purpose of this study was to determine if central corneal thickness (CCT) affects the accuracy of this technique. Methods: The ACD of 50 subjects was measured by A‐scan ultrasonography and estimated by the slitlamp technique. CCT was measured by ultrasonic pachometry. The refractive error was determined subjectively. Results: The average ultrasonographic ACD for all subjects was 3.32 ± 0.65 mm. The average JTSL was 2.46 ± 0.38 mm. The conversion ratio between the ultrasonographic ACD and the average JTSL was 1.35. The predicted ACD using the regression equation of JTSL on the ultrasound anterior chamber depth (USACD) was 3.32 ± 0.54 mm. The corresponding value using the regression equation of JTSL and CCT on USACD was exactly the same, that is, 3.32 ± 0.54 mm. Conclusion: Incorporation of CCT into a regression equation does not improve the accuracy of the Smith technique.     

义齿用Ti-6Al-7Nb合金铸件挠度的研究

目的：通过对相同长度、宽度、不同厚度的Ti-6Al-7Nb合金铸件挠度的测量,观察铸件厚度与挠度的关系,为确定Ti-6Al-7Nb合金铸造义齿基托的适合厚度提供实验依据。方法：参照ISO关于义齿基托材料挠度的标准,测量不同厚度Ti-6Al-7Nb合金铸件的挠度,并与纯钛、Ti-6Al-4V合金及Co-Cr合金对比。结果：Ti-6Al-7Nb合金、纯钛及Ti-6Al-4V合金铸件的厚度在0.65mm时可以达到义齿基托挠度的标准;Co-Cr合金在0.57mm时可达到标准要求。结论：在临床制作Ti-6Al-7Nb合金义齿基托时,厚度应不低于0.65mm。     

高度近视LASIK治疗中角膜瓣厚度的探讨

目的:探讨高度近视LASIK治疗中角膜瓣厚度问题。方法:142例(283眼)屈光度-9.00～-12.00 D的近视患者用日本NIDEK MK-2000全自动微型板层角膜切割刀切开角膜瓣,厚度71～184μm,激光切削方式一致。将角膜瓣厚度≤110μm分为Ⅰ组,72例(144眼);角膜瓣厚度>110μm分为Ⅱ组,70例(139眼)。对术前、术后屈光度、视力以 及剩余角膜基质床厚度进行比较。结果:术前平均角膜厚度:Ⅰ组为(531.76±30.28)μm(469～575μm),Ⅱ组为(550.66±24.45)μm(506～584μm),两者有明显差异(P<0.05)。术后剩余角膜基质床厚度:Ⅰ组为(333.01±3.30)μm(273～452μm),Ⅱ组为(309.71±31.41)μm(254～368μm),两者有明显差异(P<0.05)。术前屈光度两组分别为(-10.61±1.01)D及(-10.13±0.73)D,两组间无明显差异(P>0.05),术后7 d时分别为(+1.05±1.38)D及(+1.32±1.70)D,两组间也无明显差异(P>0.05),而术后3m Ⅰ组为(-0.13±0.94)D,Ⅱ组为(-1.06±0.96)D,两组有明显的差异(P<0.01)。术前、术后不论UCVA还是BCVA,两组无明显差异(P>0.05)。结论:治疗高度近视时70～110μm的角膜瓣的制作是合理的,并不影响术后视力,对防止术后屈光回退是有效的,对一个有经验的医生来说是可以很好完成的。     

子宫内膜息肉的宫腔镜诊断和治疗价值

目的：阐明官腔镜对子宫内膜息肉的诊断和治疗价值。方法：对行宫腔镜检查的1676例患者中360例子宫内膜息肉进行研究分析，对其中的56例行经宫颈子宫内膜息肉电切术(TCRP)，术后3个月常规复查。结果：子宫内膜息肉的患病率为21．5％(360／1676)，绝经后子宫出血患者阳性病例为186例，其中子宫内膜息肉43例(23．1％)。结论：(1)子宫内膜息肉的临床特征以不规则阴道出血为主，绝经期则以绝经后出血为主；(2)绝经后妇女体内仍有雌激素持续作用；(3)宫腔镜是子宫内膜息肉诊断和治疗的首选方法。     

Breastmilk intake and growth in infants from two to ten months

Longitudinal measurements of breastmilk intake in 48 Cambridge infants showed that intake reached a peak of 824 g/24 h in boys and 741 g/24 h in girls in the third and fourth months, respectively. Regression analysis demonstrated that, in the early months, the infants' weight accounted for a major part of the variance in breastmilk intake. Infants in non-manual social classes received more breastmilk and started solids later than those in manual groups. In the early months weight gain showed a relative increase compared to growth standards, but later infancy was characterized by a progressive deceleration in weight and length gain. Adiposity, as measured by triceps skinfold thickness differed most markedly from growth charts and was only equivalent to the tenth standard centile at all ages. The lower skinfold thickness measurements are considered to be more appropriate to breastfed infants in general.     

牙片中骨量与灰度的关系及灰阶的改进

本文对较小厚度范围内颌骨、金属铝在X片上的灰度水平与厚度变化关系进行了探讨,提出在数字减影牙片中以金属铝制成均匀楔形灰阶,代替传统金箔制成的台阶式灰阶.