简介:目的探讨Free-edge六翼托槽矫治安氏Ⅱ1类错[牙合]的效果。方法选择福建医科大学附属协和医院口腔科2004—2008年收治的36例安氏Ⅱ1类病例,应用Free-edge六翼托槽进行矫治,对比矫治前后的头影测量项目。结果上颌中切牙角(U1-SN)及上颌中切牙切端至NA线的垂直距离(U1-NA)明显减小,表明上切牙明显内收。上颌支抗磨牙无明显前移。上切牙与下磨牙无明显伸长。下颌平面与[牙合]平面无明显逆时针旋转。结论应用Free-edge六翼托槽可最大限度减少额外支抗的使用,并可避免传统方丝弓技术Ⅱ类牵引所可能导致的负面影响。
简介:摘要目的比较研究Free-edge矫治技术剜除下颌第三磨牙治疗安氏Ⅲ类错的建议。方法择取我院收治的38例安氏Ⅲ类错患者进行研究,以入院时间为依据将所选患者平均分为两组,拔牙组19例;非拔牙组19例。所选患者均通过Free-edge直丝系列托槽进行治疗。拔牙组患者同时行以挖除下颌第三颗磨牙治疗。结果两组患者上下牙列均排列整齐,覆盖处于正常状态,咬关系良好,磨牙关系中性,软组织侧貌得到显著改善,趋于或达到直面型。结论针对安氏Ⅲ类错患者行以Free-edge矫治技术剜除下颌第三磨牙治疗可取得良好效果,不管是否拔牙,Free-edge矫治技术的应用可以改善患者侧貌变化,具有显著临床价值,值得推广和应用。
简介:StraightandBentnano-cantileverspecimensarerespectivelyproposedtoinvestigatethesingle-modeandmixed-modecrackinitiationattheCu/Siinterfaceedgeinnanoscalecomponents.Withaminuteloadingapparatus,allnanoscalesamplesareinsituloadedandobserved.Numericalanalysisisemployedtoacquirethecriticalinterfacialstressdistributionsduringcrackinitiation.ThestressconcentrationregionsneartheedgeofCu/Siinterfaceinallspecimensarewithinthescaleof100nm,andthecriticalnormalandshearstresseshaveacircularrelationinnanoscalecomponents,whichrepresentsthefracturecriterionoftheinterfaceinnanoscalecomponents.
简介:Anewrnultiscaleedgedetectionmethodispresented,whichisbasedonaneffectiveedgemeasure.Theeffectiveedgemeasure,usedtoadaptivelyadjustthescalesofwavelettransform,isdefinedusingthenovelfeaturesofimageedgeobtainedfromhumanbeingvisioncharacteristics.Finally,twoexperimentsshowthattheproposedalgorithmappearstoworkwell.
简介:Weinvestigatetheelasticfieldinducedbyanedgedislocationinamultilayeredlaminatedcompositecomposedof(N—2)thinbondedelasticlayerssandwichedbetweentwosemi-infiniteelasticmedia.Asimpleclosed-formsolutionisobtainedwhenallthephaseshaveequalshearmodulusbutdifferentPoisson'sratios,andwhenthedislocationislocatedintheuppersemi-infinitephase.Theimageforceactingonthedislocationduetoitsinteractionwiththemultilayeredstructureisalsoderived.Severalspec...
简介:Inthispaper,themorphologicalfilterbasedonparametricedgedetectionispresentedandappliedtoimagingladarimagewithspecklenoise.ThisalgorithmandLaplacianofGaussian(LOG)operatorarecomparedonedgedetection.Theexperimentalresultsindicatethesuperiorperformanceofthiskindoftheedgedetection.