canine牙体解剖学

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1、DENTALANATOMY牙体解剖学Canines尖牙Canines共4颗尖牙：上下左右Maxillarycanine上颌尖牙Mandibularcanine下颌尖牙“Cornerstoneofthedentalarches”Functions：pierceandtearfoodCaninesAstrong,well-formedcuspCrownandrootaremarkedlyconvexinmostsurfaces.MaxillaryCanines上颌尖牙longestrootandbiggestsinglecuspLabialsurfacePentagon：Mesialedg

2、eMesialobliqueedgeDistalobliqueedgeDistaledgeCervicaledgeMesioincisalangleDistoincisalangleLabialsurfaceLabialridge唇轴嵴MesialslopeDistalslopeDevelopementalgrooves:besidesthelabialridgeLabialsurfaceHeightofcontour:onthelabialridgebetweenmiddleandcervicalonethirdLabialsurfaceMesialanddistalobliquee

3、dgemaketheangleof90°Lingualsurface较唇面稍小MesialridgeDistalridgeMesialcuspridgeDistalcuspridgeCingulumLingualridgeLingualfossaMesialfossaDistalfossaLingualsurfaceMesialridgenarrowerandlonger近中边缘嵴窄而长Distalridgewiderandshorter远中边缘嵴宽而短LingualsurfaceCingulum舌隆突ProximalsurfaceMesialsurface近中面Distalsurfa

4、ce远中面近中面似三角形，远中面更为突出且短小。接触区(contactarea)：近中距切角较近，远中距切角稍远。ProximalsurfaceCusp4ridgesand4slopes:Labialridge;lingualridge;mesialcuspridge;distalcuspridgeMesiolabialslope;Distolabialslope;Mesiolingualslope;DistolingualslopeCusptip:mesialsideRoot牙根MesialDistalLingualLabialRoot牙根单根，形粗壮，唇舌径大于近远中径根长为冠长两

5、倍颈部横切面为卵圆三角形根尖弯向远中MandibularCanines下颌尖牙ResemblemaxillarycaninesButnarrowerandthinner,CrownisslimmerLabialsurfaceNarrowerpentagon狭长五边形切颈径明显大于近远中径唇颈嵴，唇轴嵴，发育沟较上颌不明显LabialsurfaceMesialedge:thelongestedge,paralleltothelongaxisDistaledge:shorterIncisaledge:mesialobliqueedge,distalobliqueedgemesial:dis

6、tal=1:2,angle>90LingualsurfaceLingualridge:不如上尖牙明显切1/3较突Heightofcontour:cingulumProximalsurface牙冠与牙根唇缘相连约呈弧线mesialdistalCusp不如上尖牙显著，明显偏近中Root单根，扁圆细长近远中根面有浅的长形凹陷根颈1/3横切面呈圆扁形根尖偏向远中mesialdistalDifferencesbetweenmaxillaryandmandibularcanines上尖牙下尖牙体积较大，牙冠宽大体积较小，牙冠窄长嵴，舌隆突较明显，舌窝较深嵴，舌隆突不很明显，舌窝较浅近中缘自颈缘至近

7、中切角向近中展开近中缘与牙根近中缘相连呈直线近中斜缘与远中斜缘相交呈直角呈钝角牙尖顶偏近中明显偏近中冠根唇缘相连不呈弧线冠根唇缘相连呈弧线牙根粗长，颈横切面成卵圆三角形牙根细长，颈横切面成扁圆Clinicalapplication诸面光滑，自洁作用较好，较少龋坏上尖牙位于口角，牙根粗长，能承受较大牙合力，具有支撑口角作用牙根长，常是口内保留时间最长的牙。较好的基牙上上尖牙牙根圆锥形单根较直，拔牙可用旋转力，下牙牙根稍扁圆，可采用唇舌向脱位