充足的骨量是保证种植体植入和维持长期稳定的关键因素,因而对牙槽骨重度骨缺损的修复重建有着重要的临床意义。随着引导骨再生(guided bone regeneration,GBR)的不断发展,各种GBR术式应用于临床,以解决牙槽骨修复与再生问题。作者基于...充足的骨量是保证种植体植入和维持长期稳定的关键因素,因而对牙槽骨重度骨缺损的修复重建有着重要的临床意义。随着引导骨再生(guided bone regeneration,GBR)的不断发展,各种GBR术式应用于临床,以解决牙槽骨修复与再生问题。作者基于“以稳定性为核心”的牙槽骨修复与再生理念,研发了帐篷钉系列产品,取得了口腔类Ⅲ类医疗器械注册证,并完成了新型帐篷钉技术的构建。该技术能够在不使用自体骨的情况下实现牙槽骨重度缺损的修复与重建,为牙槽骨重度缺损的功能和美学修复提供了新的解决方案。新型帐篷钉技术已在临床上获得了成功验证,并且由于其具有“三低”(技术敏感性低、失败率低及成本低)和“三易”(易操作、易推广及易普及)的特点,使该技术备受口腔医师和患者的青睐。为了进一步提升广大临床医生对新型帐篷钉技术的认识,本文就帐篷钉系列医疗产品的创新性及新型帐篷钉技术的优势作详细介绍,并通过临床病例进行展示,以期该项技术能够在临床上得到规范化应用。展开更多
In this study, we investigate the photoluminescence （PL） properties of γ and θ-alumina nanoparticles synthesized by the chemical wet method followed by annealing. The obtained experimental results indicate the pre...In this study, we investigate the photoluminescence （PL） properties of γ and θ-alumina nanoparticles synthesized by the chemical wet method followed by annealing. The obtained experimental results indicate the presence of some favorable near ultraviolet （NUV）-orange luminescent centers for usage in various luminescence applications, such as oxygen vacancies （F, F＋, F2＋, and F2 centers）, OH related defects, cation interstitial centers, and some new luminescence bands attributed to trapped-hole centers or donor-acceptor centers. The energy states of each defect are discussed in detail. The defects mentioned could alter the electronic structure by producing some energy states in the band gap that result in the optical absorption in the middle ultraviolet （MUV） region. Spectra show that photoionazation of F and F2 centers plays a crucial role in providing either free electrons for the conduction band, or the photoconversions of aggregated oxygen va- cancies into each other, or mobile electrons for electrons-holes recombination process by the Shockley-Read-Hall （SRH） mechanism.展开更多
Our calculations demonstrate that the concentration of neutral oxygen vacancies can affect the geometrical structrue,electronic structure, and optical properties of α-quartz. Moreover, the distribution of the neutral...Our calculations demonstrate that the concentration of neutral oxygen vacancies can affect the geometrical structrue,electronic structure, and optical properties of α-quartz. Moreover, the distribution of the neutral oxygen divacancy can also exert some influence on the properties of α-quartz. The dissimilarity and similarities are presented in the corresponding density of state（DOS） and absorption spectrum. In addition, when a higher defect concentration is involved in α-quartz,the influence of E1 center on the geometry of α-quartz becomes more significant. However, the introduction of an E1 center barely results in any improvement compared with the influence produced by the corresponding neutral defect.展开更多
文摘充足的骨量是保证种植体植入和维持长期稳定的关键因素,因而对牙槽骨重度骨缺损的修复重建有着重要的临床意义。随着引导骨再生(guided bone regeneration,GBR)的不断发展,各种GBR术式应用于临床,以解决牙槽骨修复与再生问题。作者基于“以稳定性为核心”的牙槽骨修复与再生理念,研发了帐篷钉系列产品,取得了口腔类Ⅲ类医疗器械注册证,并完成了新型帐篷钉技术的构建。该技术能够在不使用自体骨的情况下实现牙槽骨重度缺损的修复与重建,为牙槽骨重度缺损的功能和美学修复提供了新的解决方案。新型帐篷钉技术已在临床上获得了成功验证,并且由于其具有“三低”(技术敏感性低、失败率低及成本低)和“三易”(易操作、易推广及易普及)的特点,使该技术备受口腔医师和患者的青睐。为了进一步提升广大临床医生对新型帐篷钉技术的认识,本文就帐篷钉系列医疗产品的创新性及新型帐篷钉技术的优势作详细介绍,并通过临床病例进行展示,以期该项技术能够在临床上得到规范化应用。
基金Iran’s Nanotechnology initiative council for their financial support
文摘In this study, we investigate the photoluminescence （PL） properties of γ and θ-alumina nanoparticles synthesized by the chemical wet method followed by annealing. The obtained experimental results indicate the presence of some favorable near ultraviolet （NUV）-orange luminescent centers for usage in various luminescence applications, such as oxygen vacancies （F, F＋, F2＋, and F2 centers）, OH related defects, cation interstitial centers, and some new luminescence bands attributed to trapped-hole centers or donor-acceptor centers. The energy states of each defect are discussed in detail. The defects mentioned could alter the electronic structure by producing some energy states in the band gap that result in the optical absorption in the middle ultraviolet （MUV） region. Spectra show that photoionazation of F and F2 centers plays a crucial role in providing either free electrons for the conduction band, or the photoconversions of aggregated oxygen va- cancies into each other, or mobile electrons for electrons-holes recombination process by the Shockley-Read-Hall （SRH） mechanism.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11176020 and 11374217)the Doctoral Program of Higher Education of China(Grant No.20100181110080)
文摘Our calculations demonstrate that the concentration of neutral oxygen vacancies can affect the geometrical structrue,electronic structure, and optical properties of α-quartz. Moreover, the distribution of the neutral oxygen divacancy can also exert some influence on the properties of α-quartz. The dissimilarity and similarities are presented in the corresponding density of state（DOS） and absorption spectrum. In addition, when a higher defect concentration is involved in α-quartz,the influence of E1 center on the geometry of α-quartz becomes more significant. However, the introduction of an E1 center barely results in any improvement compared with the influence produced by the corresponding neutral defect.
