最新上颌第一前磨牙外形雕刻【精品-】课件PPT.ppt 27页

'上颌第一前磨牙外形雕刻【精品-】 一实验目的、要求1.通过对前磨牙牙体外形的雕刻，牢固掌握其解剖形态及生理特点。第一前磨牙外形雕刻2.掌握前磨牙雕刻的方法、步骤。3.进一步训练雕刻的基本方法，达到能自如地运用握笔式和掌拇指握式方法进行雕刻，并能自如地运用支点。 二器材白蜡块（大约60×30×20mm3长方体）、尖牙雕刻标本一套、雕刻刀、游标卡尺、玻板或硬纸板、笔、座标纸、白帕子。三方法步骤1.了解上颌第一前磨牙各部位尺寸（表）第一前磨牙外形雕刻 从垂直方向逐步削除牙冠和牙根近中面和远中面多余之蜡。留下的蜡形，可比颊面稍大1mm，以便将来修改3.初步形成颊面第一前磨牙外形雕刻牙尖可以不切以便邻面画图 画出近中面外形线在不规则的近中面绘出尖牙近中面图形，从垂直方向去除颊、舌多余之蜡,并多余留1mm的蜡4.初步形成近中面第一前磨牙外形雕刻冠厚颈厚 第一前磨牙外形雕刻完成舌面及远中面的雕刻，使舌面较颊面略小，表面圆突，远中面较近中面略小且突，然后用雕刻刀进行初步修整，使牙冠牙合面形成六边形，各轴面相交线角圆钝，外形高点及接触点适宜。5.形成轴面雏形 在牙冠各面绘出颈曲线，其中近中颈曲度大于远中颈曲度，并完成颈部雕刻，使牙冠在颈缘处略突于根部。第一前磨牙外形雕刻6.形成颈缘曲线7.雕刻牙合面（1）初步形成近远中向沟如图虚线所示，在邻面画出“v”线表示沟形状，沟底约位于至颊、舌侧边缘的距离相等处，沟底深度不超过牙合1/3的2/3长，然后用雕刻刀按标志线雕出两斜面，形成近远中向沟。 第一前磨牙外形雕刻（2）形成牙合面轮廓在牙合面上确定颊尖、舌尖顶的位置，使颊尖顶偏远中，舌尖顶偏近中，然后画出牙合面外形线。颊侧宽于舌侧，远中边缘嵴长于近中边缘嵴。再用雕刻刀修去牙合面外形以外多余的蜡，形成牙合面轮廓 （3）形成牙合面雏形由颊尖顶至舌尖顶画一直线，为颊舌尖三角嵴的标志。然后在三角嵴线两旁画出近远中窝及边缘嵴的位置，根据近远中窝、边缘嵴的位置，用雕刻刀形成近远中边缘嵴，沿三角嵴标志线分别斜向近远中两侧雕刻出近远中两个斜面，形成三角嵴。按斜线所示，完成牙合面雏形。第一前磨牙外形雕刻颊尖颊侧近中斜面颊侧 （3）完成牙合面雕刻用雕刻刀修整近、远中窝，形成中央沟，近中沟及远中沟。近中沟要越过近中边缘嵴到达近中面，并使牙合面各个形态表面圆突光滑，完成牙合面雕刻第一前磨牙外形雕刻 （1）颊面的颊轴嵴和斜面的形成同上颌尖牙唇面的唇轴嵴和斜面的形成方法，只是颊轴嵴不如上颌尖牙唇轴嵴明显。（2）牙合面雕刻时一定要参照标本模型，掌握好颊舌尖、三角嵴、近远中窝及沟的大小、长宽以及同各个轴角、近、远中边缘嵴的关系。（3）牙合面窝及沟的深度一定要适当，颊舌尖三角嵴连接处应低于边缘嵴。（4）雕刻过程中自始至终要保持牙冠长度。8.雕刻中注意事项第一前磨牙外形雕刻 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 七年级语文上册　词语运用练习 D D C B C D C D C C'