A、颊侧无<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/7648689b-deab-4837-bf01-10caab85db12.jpg" width="13" height="16" /> 接触部位
B、舌侧无<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/7648689b-deab-4837-bf01-10caab85db12.jpg" width="13" height="16" /> 接触部位
C、颊侧<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/0eaa4d44-348d-4257-8fe9-fd9a6712e077.jpg" width="13" height="16" /> 边缘嵴
D、舌侧<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/0eaa4d44-348d-4257-8fe9-fd9a6712e077.jpg" width="13" height="16" /> 边缘嵴
E、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/0eaa4d44-348d-4257-8fe9-fd9a6712e077.jpg" width="13" height="16" />接触部位
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