目的评价硅氧烷基树脂Filtek P90配套粘接剂silorane system adhesive(SA)的牙本质粘接强度及耐久性,以期为临床应用提供参考。方法选择24颗人离体磨牙,随机分为三组:SE组:两步法自酸蚀粘接剂Clearfil SE Bond(SE)+P60树脂;EO组:一步法...目的评价硅氧烷基树脂Filtek P90配套粘接剂silorane system adhesive(SA)的牙本质粘接强度及耐久性,以期为临床应用提供参考。方法选择24颗人离体磨牙,随机分为三组:SE组:两步法自酸蚀粘接剂Clearfil SE Bond(SE)+P60树脂;EO组:一步法自酸蚀粘接剂Adper Easy One(EO)+P60树脂;SA组:SA+硅氧烷基P90树脂。每组8颗牙齿,按照相应的使用说明在制备的牙本质平面上粘接树脂块,用硬组织切片机制备截面积约为1mm^2的条状试样,切割得到的试样一半在即刻测试微拉伸粘接强度,另一半蒸馏水浸泡6个月后测试微拉伸粘接强度。结果粘接后24h切割得到的试样进行即刻微拉伸强度测试,SA组SA的粘接强度为[(24.96±2.29)MPa]与SE组粘接剂SE的粘接强度[(35.90±3.68)MPa]差异有统计学意义(P<0.05),而与EO组粘接剂EO[(24.23±2.89)MPa]差异无统计学意义(P>0.05)。蒸馏水保存6个月后,SA的微拉伸粘接强度与即刻相比差异没有统计学意义(P>0.05)。SE、EO的微拉伸粘接强度均低于切割后即刻,差异有统计学意义(P<0.05)。蒸馏水浸泡6个月后,SA的粘接强度[(23.23±2.38)MPa]仍与SE组的粘接强度[(32.21±2.85)MPa]差异有统计学意义(P<0.05),但高于EO组EO的粘接强度[(20.52±3.40)MPa](P<0.05)。结论 SA的粘接界面拥有良好的耐久性。蒸馏水保存6个月后SA的粘接强度较EO一步法自酸蚀粘接剂粘接强度高,但仍低于两步法自酸蚀粘接剂SE的粘接强度。展开更多
We outline probable and possible developments with wireless capsule endoscopy. It seems likely that capsule endoscopy will become increasingly effective in diagnostic gastrointestinal endoscopy. This will be attractiv...We outline probable and possible developments with wireless capsule endoscopy. It seems likely that capsule endoscopy will become increasingly effective in diagnostic gastrointestinal endoscopy. This will be attractive to patients especially for cancer or varices detection because capsule endoscopy is painless and is likely to have a higher take up rate compared to conventional colonoscopy and gastroscopy. Double imager capsules with increased frame rates have been used to image the esophagus for Barrett's and esophageal varices. The image quality is not bad but needs to be improved if it is to become a realistic substitute for flexible upper and lower gastrointestinal endoscopy. An increase in the frame rate, angle of view, depth of field, image numbers, duration of the procedure and improvements in illumination seem likely. Colonic, esophageal and gastric capsules will improve in quality, eroding the supremacy of flexible endoscopy, and become embedded into screening programs. Therapeutic capsules will emerge with brushing, cytology, fluid aspiration, biopsy and drug delivery capabilities. Electrocautery may also become possible. Diagnostic capsules will integrate physiological measurements with imaging and optical biopsy, and immunologic cancer recognition. Remote control movement will improve with the use of magnets and/or electrostimulation and perhaps electromechanical methods. External wireless commands will influence capsule diagnosis and therapy and will increasingly entail the use of real-time imaging. However, it should be noted that speculations about the future of technology in any detail are almost always wrong.展开更多
A kind of modified epoxy resins was obtained by condensation of epoxy resin with silicic acid tetraethyl ester（TEOS） and nano-SiO2. The reactions were performed with hydrochloric acid as a catalyst at 63 ℃. The str...A kind of modified epoxy resins was obtained by condensation of epoxy resin with silicic acid tetraethyl ester（TEOS） and nano-SiO2. The reactions were performed with hydrochloric acid as a catalyst at 63 ℃. The structure, thermal stability and morphological characteristics of the modified epoxy resins were studied through infrared spectra（FT-IR） analysis, thermogravimetric（TG） analysis and scanning electron microscopy respectively. It has been found from the IR and TG study that modified epoxy resins have greater thermal stability than epoxy resins, and its thermal stability has been improved by the formation of inter-crosslinked network structure. The modified epoxy resins exhibit heterogeneous morphology and heterogeneity increases with more TEOS feeding, which in turn confirms the formation of inter-crosslinked network structure in modified epoxy resins.展开更多
文摘目的评价硅氧烷基树脂Filtek P90配套粘接剂silorane system adhesive(SA)的牙本质粘接强度及耐久性,以期为临床应用提供参考。方法选择24颗人离体磨牙,随机分为三组:SE组:两步法自酸蚀粘接剂Clearfil SE Bond(SE)+P60树脂;EO组:一步法自酸蚀粘接剂Adper Easy One(EO)+P60树脂;SA组:SA+硅氧烷基P90树脂。每组8颗牙齿,按照相应的使用说明在制备的牙本质平面上粘接树脂块,用硬组织切片机制备截面积约为1mm^2的条状试样,切割得到的试样一半在即刻测试微拉伸粘接强度,另一半蒸馏水浸泡6个月后测试微拉伸粘接强度。结果粘接后24h切割得到的试样进行即刻微拉伸强度测试,SA组SA的粘接强度为[(24.96±2.29)MPa]与SE组粘接剂SE的粘接强度[(35.90±3.68)MPa]差异有统计学意义(P<0.05),而与EO组粘接剂EO[(24.23±2.89)MPa]差异无统计学意义(P>0.05)。蒸馏水保存6个月后,SA的微拉伸粘接强度与即刻相比差异没有统计学意义(P>0.05)。SE、EO的微拉伸粘接强度均低于切割后即刻,差异有统计学意义(P<0.05)。蒸馏水浸泡6个月后,SA的粘接强度[(23.23±2.38)MPa]仍与SE组的粘接强度[(32.21±2.85)MPa]差异有统计学意义(P<0.05),但高于EO组EO的粘接强度[(20.52±3.40)MPa](P<0.05)。结论 SA的粘接界面拥有良好的耐久性。蒸馏水保存6个月后SA的粘接强度较EO一步法自酸蚀粘接剂粘接强度高,但仍低于两步法自酸蚀粘接剂SE的粘接强度。
文摘We outline probable and possible developments with wireless capsule endoscopy. It seems likely that capsule endoscopy will become increasingly effective in diagnostic gastrointestinal endoscopy. This will be attractive to patients especially for cancer or varices detection because capsule endoscopy is painless and is likely to have a higher take up rate compared to conventional colonoscopy and gastroscopy. Double imager capsules with increased frame rates have been used to image the esophagus for Barrett's and esophageal varices. The image quality is not bad but needs to be improved if it is to become a realistic substitute for flexible upper and lower gastrointestinal endoscopy. An increase in the frame rate, angle of view, depth of field, image numbers, duration of the procedure and improvements in illumination seem likely. Colonic, esophageal and gastric capsules will improve in quality, eroding the supremacy of flexible endoscopy, and become embedded into screening programs. Therapeutic capsules will emerge with brushing, cytology, fluid aspiration, biopsy and drug delivery capabilities. Electrocautery may also become possible. Diagnostic capsules will integrate physiological measurements with imaging and optical biopsy, and immunologic cancer recognition. Remote control movement will improve with the use of magnets and/or electrostimulation and perhaps electromechanical methods. External wireless commands will influence capsule diagnosis and therapy and will increasingly entail the use of real-time imaging. However, it should be noted that speculations about the future of technology in any detail are almost always wrong.
文摘A kind of modified epoxy resins was obtained by condensation of epoxy resin with silicic acid tetraethyl ester（TEOS） and nano-SiO2. The reactions were performed with hydrochloric acid as a catalyst at 63 ℃. The structure, thermal stability and morphological characteristics of the modified epoxy resins were studied through infrared spectra（FT-IR） analysis, thermogravimetric（TG） analysis and scanning electron microscopy respectively. It has been found from the IR and TG study that modified epoxy resins have greater thermal stability than epoxy resins, and its thermal stability has been improved by the formation of inter-crosslinked network structure. The modified epoxy resins exhibit heterogeneous morphology and heterogeneity increases with more TEOS feeding, which in turn confirms the formation of inter-crosslinked network structure in modified epoxy resins.
