目的:利用共振频率分析(resonance frequency analysis,RFA)仪器监测Straumann种植体骨愈合期的稳定性变化,并探讨其影响因素。方法:选择25例牙列缺损患者,共植入Straumann种植体52颗。用RFA仪器分别测量各种植体在种植术当天、术后1、4...目的:利用共振频率分析(resonance frequency analysis,RFA)仪器监测Straumann种植体骨愈合期的稳定性变化,并探讨其影响因素。方法:选择25例牙列缺损患者,共植入Straumann种植体52颗。用RFA仪器分别测量各种植体在种植术当天、术后1、4、6、8、12周的种植体稳定性(ISQ值)。将ISQ值进行通用线性模型的方差分析,采用Minitab软件包进行统计学处理。结果:所有种植体在植入时都取得了良好的初期稳定性。种植术后当天,ISQ平均值为64.39±0.66,术后呈现下降趋势,并在术后第4周下降至最低,而从第4周到第6周出现明显上升。统计学分析表明,种植区和牙槽骨对种植体ISQ值有显著影响(P<0.05),种植体长度、颈部高度对种植体ISQ值无明显影响。术后12周,种植体存活率为100%。结论:种植体稳定性与种植体区位置和牙槽骨类型关系密切,而种植体的长度和颈部高度的影响尚缺乏足够临床证据。展开更多
目的:利用共振频率分析(resonance frequency analysis,RFA)仪器监测经单纯上颌窦内提升(osteotome sinus floor elevation without grafting,OSFE without grafting)植入Strauamnn种植体的早期稳定性,分析上颌窦底剩余牙槽骨高度(resid...目的:利用共振频率分析(resonance frequency analysis,RFA)仪器监测经单纯上颌窦内提升(osteotome sinus floor elevation without grafting,OSFE without grafting)植入Strauamnn种植体的早期稳定性,分析上颌窦底剩余牙槽骨高度(residual bone height,RBH)对RFA结果的影响。方法:采用单纯OSFE方式,对48例牙列缺损患者各植入1颗Straumann SLA宽颈美学种植体(4.8 mm×8 mm)。用RFA仪器分别于手术当天、术后2、4、6、8、12、16、20周测量种植体稳定性,所得参数为种植体稳定系数(implant stability quotient,ISQ)。采用SPSS 17.0软件包对数据进行统计学分析。结果:48颗种植体的存活率为97.9%。所有种植体都获得了良好的初期稳定性。手术当天ISQ值较高,于第2周至第6周逐渐下降,之后逐渐上升,最终达到较高水平。上颌窦底剩余骨高度(residual bone height,RBH)与ISQ值无显著相关性。结论:单纯OSFE方式在上后牙区严重骨量不足情况下仍可获得良好的种植体稳定性。RBH对于种植体的早期稳定性无显著影响。展开更多
目的应用共振频率分析(resonance frequency analysis,RFA)定量比较上颌后牙区常规种植和采用3种不同的上颌窦提升术(穿牙槽嵴技术、同期侧壁开窗技术和分期侧壁开窗技术)位点种植体的稳定性。方法选取2013—2014年于大连市口腔医院种...目的应用共振频率分析(resonance frequency analysis,RFA)定量比较上颌后牙区常规种植和采用3种不同的上颌窦提升术(穿牙槽嵴技术、同期侧壁开窗技术和分期侧壁开窗技术)位点种植体的稳定性。方法选取2013—2014年于大连市口腔医院种植科行上颌后牙区种植修复患者103例(植入单颗或多颗Straumann种植体,共139颗种植体),根据缺牙区剩余牙槽嵴高度分为A、B、C、D组,分别采用常规种植和3种不同的上颌窦提升术(穿牙槽嵴技术、同期侧壁开窗技术和分期侧壁开窗技术)植入种植体。使用RFA,测量种植体植入时和植入后6个月的种植体稳定系数(implant stability quotient,ISQ)。比较各组之间以及同组不同时段之间的ISQ差异。结果所有种植体均获得较好的骨结合,无失败病例。各组种植体植入时与植入后6个月的ISQ值比较,差异均有统计学意义(均P<0.05);A^D组在种植体植入后6个月的ISQ值比种植体植入时分别增加了4.96±2.41、5.39±2.09、4.47±1.48和5.16±1.99。方差分析结果显示,无论是在种植体植入时还是在植入后6个月,4组的ISQ值差异均无统计学意义(均P>0.05)。结论在剩余牙槽嵴萎缩的上颌后牙区,可根据剩余骨量合理选择治疗方案。3种方法提升上颌窦(穿牙槽嵴技术、同期和分期侧壁开窗技术)后,植入种植体的稳定性没有明显差异,种植体均能获得良好的骨结合。使用RFA测量ISQ值,可以定量比较不同方法植入种植体的临床效果。展开更多
Relative intensity noise(RIN) and high-speed modulation characteristics are investigated for an Al Ga In As/In P hybrid square-rectangular laser(HSRL) with square side length, rectangular length, and width of 15,300, ...Relative intensity noise(RIN) and high-speed modulation characteristics are investigated for an Al Ga In As/In P hybrid square-rectangular laser(HSRL) with square side length, rectangular length, and width of 15,300, and 2 μm, respectively. Single-mode operation with side-mode suppression larger than 40 dB has been realized for the HSRL over wide variation of the injection currents. In addition, the HSRL exhibits a 3 dB modulation bandwidth of 15.5 GHz, and an RIN nearly approaches standard quantum shot-noise limit 2 hv∕P=-164 dB∕Hz at high bias currents due to the strong mode selection of the square microcavity. With the increase of the DC bias current of the Fabry–Perot section, significantly enhanced modulation bandwidth and decreased RIN are observed.Furthermore, intrinsic parameters such as resonance frequency, damping factor, and modified Schawlow–Townes linewidth are extracted from the noise spectra.展开更多
Thin film of biodegradable calcium phosphate coated on threaded commercially pure titanium （ cp- Ti ） dental implants has been investigated as one of alternatives to eliminate the problem of the long- term instabil...Thin film of biodegradable calcium phosphate coated on threaded commercially pure titanium （ cp- Ti ） dental implants has been investigated as one of alternatives to eliminate the problem of the long- term instability of plasma sprayed HA coated implants. In order to compare in-vivo bone-to-implant response behavior among as-machined, HA coated and CMP coated groups, each group was implanted into New Zealand white mature male rabbits for 2 and 6 weeks, and then in-vivo biological behavior was examined in terms of H＆E staining. Initial stability and removable torques of implants were compared among three groups. Measured removable torque of CMP coated specimen at 6 weeks after inplantation was significantly higher than that of non-coated group, but slightly lower than that of HA coated group, without any inflammatory response at the surrounding of the implants. The initial stability （ ISQ value ; implant stability quotient ） of CMP coated specimen at 2 weeks after implantation was slightly lower than that of HA coated group and significantly higher than that of non-coated group. However, after 6 weeks, ISQ value of CMP coated group was slightly higher than that of HA coated group and significantly higher than that of non-coated group.展开更多
The stability parameters of implants （ITV, ISQ ＆ PTV） according to different sizes of controlled bone defects made in implant osteotomies were analyzed and the correlation among the three kinds of implant stability...The stability parameters of implants （ITV, ISQ ＆ PTV） according to different sizes of controlled bone defects made in implant osteotomies were analyzed and the correlation among the three kinds of implant stability parameters was tested in this study. 45 tapped screw-type dental implants were inserted in three types of implant osteotomies made in 8 fresh-frozen pig femoral bones： Typel - without coronal bone defect, Type2 - with 3 mm coronal bone defects, and Type3 - with 6 mm coronal bone defects. The insertion torque values, ISQ ＆ PTV of implants were measured and analyzed statistically. It is concluded that the circumferential coronal bone defects statistically influence the primary stability of implants; ITV, ISQ and PTV are suitable and available to detect the peri-implant coronal bone defects in 3 mm increments, and ITV and PTV are more sensitive to coronal cortical bone loss. There was a strong correlation between ITV and ISQ.展开更多
文摘目的:利用共振频率分析(resonance frequency analysis,RFA)仪器监测Straumann种植体骨愈合期的稳定性变化,并探讨其影响因素。方法:选择25例牙列缺损患者,共植入Straumann种植体52颗。用RFA仪器分别测量各种植体在种植术当天、术后1、4、6、8、12周的种植体稳定性(ISQ值)。将ISQ值进行通用线性模型的方差分析,采用Minitab软件包进行统计学处理。结果:所有种植体在植入时都取得了良好的初期稳定性。种植术后当天,ISQ平均值为64.39±0.66,术后呈现下降趋势,并在术后第4周下降至最低,而从第4周到第6周出现明显上升。统计学分析表明,种植区和牙槽骨对种植体ISQ值有显著影响(P<0.05),种植体长度、颈部高度对种植体ISQ值无明显影响。术后12周,种植体存活率为100%。结论:种植体稳定性与种植体区位置和牙槽骨类型关系密切,而种植体的长度和颈部高度的影响尚缺乏足够临床证据。
文摘目的:利用共振频率分析(resonance frequency analysis,RFA)仪器监测经单纯上颌窦内提升(osteotome sinus floor elevation without grafting,OSFE without grafting)植入Strauamnn种植体的早期稳定性,分析上颌窦底剩余牙槽骨高度(residual bone height,RBH)对RFA结果的影响。方法:采用单纯OSFE方式,对48例牙列缺损患者各植入1颗Straumann SLA宽颈美学种植体(4.8 mm×8 mm)。用RFA仪器分别于手术当天、术后2、4、6、8、12、16、20周测量种植体稳定性,所得参数为种植体稳定系数(implant stability quotient,ISQ)。采用SPSS 17.0软件包对数据进行统计学分析。结果:48颗种植体的存活率为97.9%。所有种植体都获得了良好的初期稳定性。手术当天ISQ值较高,于第2周至第6周逐渐下降,之后逐渐上升,最终达到较高水平。上颌窦底剩余骨高度(residual bone height,RBH)与ISQ值无显著相关性。结论:单纯OSFE方式在上后牙区严重骨量不足情况下仍可获得良好的种植体稳定性。RBH对于种植体的早期稳定性无显著影响。
文摘目的应用共振频率分析(resonance frequency analysis,RFA)定量比较上颌后牙区常规种植和采用3种不同的上颌窦提升术(穿牙槽嵴技术、同期侧壁开窗技术和分期侧壁开窗技术)位点种植体的稳定性。方法选取2013—2014年于大连市口腔医院种植科行上颌后牙区种植修复患者103例(植入单颗或多颗Straumann种植体,共139颗种植体),根据缺牙区剩余牙槽嵴高度分为A、B、C、D组,分别采用常规种植和3种不同的上颌窦提升术(穿牙槽嵴技术、同期侧壁开窗技术和分期侧壁开窗技术)植入种植体。使用RFA,测量种植体植入时和植入后6个月的种植体稳定系数(implant stability quotient,ISQ)。比较各组之间以及同组不同时段之间的ISQ差异。结果所有种植体均获得较好的骨结合,无失败病例。各组种植体植入时与植入后6个月的ISQ值比较,差异均有统计学意义(均P<0.05);A^D组在种植体植入后6个月的ISQ值比种植体植入时分别增加了4.96±2.41、5.39±2.09、4.47±1.48和5.16±1.99。方差分析结果显示,无论是在种植体植入时还是在植入后6个月,4组的ISQ值差异均无统计学意义(均P>0.05)。结论在剩余牙槽嵴萎缩的上颌后牙区,可根据剩余骨量合理选择治疗方案。3种方法提升上颌窦(穿牙槽嵴技术、同期和分期侧壁开窗技术)后,植入种植体的稳定性没有明显差异,种植体均能获得良好的骨结合。使用RFA测量ISQ值,可以定量比较不同方法植入种植体的临床效果。
基金National Key R&D Program of China(2016YFB0402304)National Natural Science Foundation of China(NSFC)(61235004,61377105,61527823)
文摘Relative intensity noise(RIN) and high-speed modulation characteristics are investigated for an Al Ga In As/In P hybrid square-rectangular laser(HSRL) with square side length, rectangular length, and width of 15,300, and 2 μm, respectively. Single-mode operation with side-mode suppression larger than 40 dB has been realized for the HSRL over wide variation of the injection currents. In addition, the HSRL exhibits a 3 dB modulation bandwidth of 15.5 GHz, and an RIN nearly approaches standard quantum shot-noise limit 2 hv∕P=-164 dB∕Hz at high bias currents due to the strong mode selection of the square microcavity. With the increase of the DC bias current of the Fabry–Perot section, significantly enhanced modulation bandwidth and decreased RIN are observed.Furthermore, intrinsic parameters such as resonance frequency, damping factor, and modified Schawlow–Townes linewidth are extracted from the noise spectra.
文摘Thin film of biodegradable calcium phosphate coated on threaded commercially pure titanium （ cp- Ti ） dental implants has been investigated as one of alternatives to eliminate the problem of the long- term instability of plasma sprayed HA coated implants. In order to compare in-vivo bone-to-implant response behavior among as-machined, HA coated and CMP coated groups, each group was implanted into New Zealand white mature male rabbits for 2 and 6 weeks, and then in-vivo biological behavior was examined in terms of H＆E staining. Initial stability and removable torques of implants were compared among three groups. Measured removable torque of CMP coated specimen at 6 weeks after inplantation was significantly higher than that of non-coated group, but slightly lower than that of HA coated group, without any inflammatory response at the surrounding of the implants. The initial stability （ ISQ value ; implant stability quotient ） of CMP coated specimen at 2 weeks after implantation was slightly lower than that of HA coated group and significantly higher than that of non-coated group. However, after 6 weeks, ISQ value of CMP coated group was slightly higher than that of HA coated group and significantly higher than that of non-coated group.
基金Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education,China
文摘The stability parameters of implants （ITV, ISQ ＆ PTV） according to different sizes of controlled bone defects made in implant osteotomies were analyzed and the correlation among the three kinds of implant stability parameters was tested in this study. 45 tapped screw-type dental implants were inserted in three types of implant osteotomies made in 8 fresh-frozen pig femoral bones： Typel - without coronal bone defect, Type2 - with 3 mm coronal bone defects, and Type3 - with 6 mm coronal bone defects. The insertion torque values, ISQ ＆ PTV of implants were measured and analyzed statistically. It is concluded that the circumferential coronal bone defects statistically influence the primary stability of implants; ITV, ISQ and PTV are suitable and available to detect the peri-implant coronal bone defects in 3 mm increments, and ITV and PTV are more sensitive to coronal cortical bone loss. There was a strong correlation between ITV and ISQ.
