Research on the etiology of nasal polyps

One hundred and seventy patients with nasal polyps were studied. According to the history, skin tests with inhalant allergens, determination of serum nasal secretion and polyp fluid IgE, and X-ray films of nasal sinuses, it was suggested that 93.5% of them might have complicated with allergic diseases, 87.7% with sinusitis. A relationship between local IgE production and the eosinophil infiltration of polyps existed. This study suggests that allergic process acting locally on the mucous membrane of the nose is the etiologic factor and bacterial allergy probably contributes to the development of nasal polyps. In order to prevent the recurrence after polypectomy, antiallergic management combined with antibiotics and drainage of infected sinuses may be necessary in most cases.     

An imaging routine for assessing the efficacy of instruments used for scaling and root planning

Deposits of dental plaque or calculus are typically quantified using planimetric techniques. However, error is introduced into a quantitative analysis of plaque deposits using these methods, since they require a significant amount of human intervention. The purpose of this study is to describe and validate a computerized imaging routine which has the potential to objectively identify material on dental roots and measure the area covered by these deposits. Dentiform teeth with simulated plaque were videorecorded. A computer routine was developed based on a flood-fill algorithm which analyzed images of the dentiform teeth and determined the amount of simulated plaque on their root surfaces. Results showed that the dentiform teeth and their simulated plaque patterns are duplicated by the imaging routine in a rapid and reliable fashion. The system shows a high degree of accuracy with an average error factor of only 0.58%. As well, the system enables precise reproducibility with an average error factor of only 0.71%.     

酪氨酸激酶抑制剂对气管上皮细胞生长的影响

目的探讨酪氨酸激酶抑制剂(Tyrosine kinase inhibitor,TKI)对培养气管上皮细胞生长的影响.方法通过MMT法、3H-胸腺嘧啶(3H-TdR)掺入法及流式细胞计数,观察3种TKIs:Tyrphostin AG1478、Genistein(Sigma)及金转停对原代培养的大鼠气管上皮细胞增殖、周期及凋亡的影响,以及TKIs对表皮生长因子(EGF)的阻断作用.结果MTT法显示3种TKI均对气管上皮细胞的生长具有时间和剂量依赖性抑制作用,同时,TKI阻断EGF对气管上皮细胞生长的刺激作用,3种TKIs的作用无明显差异;1μmol/L的Tyrphostin AG1478、Genistein及金转停分别使气管上皮细胞的TdR掺入率降低18.3%、20.9%及19.7%,与MTT比色法结果一致.同时,Tyrphostin AG1478不仅加速气管上皮细胞的凋亡而且阻止细胞有丝分裂.TKIs可阻断表皮生长因子(EGF)对气管上皮细胞生长的刺激作用.结论TKIs不仅抑制对原代培养的大鼠气管上皮细胞的生长,加速其凋亡,而且可阻断EGF对气管上皮细胞生长的刺激作用,3种抑制剂的作用无明显差异.