上颌第二、三磨牙根冠融合一例报告河南省南阳市口腔医院颌面外科刘中寅，李伟患者马某，女，７０岁，１９９３年７月因义齿修复需要拔除左上颌第二磨牙。检查：颌面部无异常，上下颌除存留外，牙齿均缺失，牙槽嵴吸收较严重，伸长，根分叉暴露，无松动，叩痛（─）。牙冠... Maxillary second and third molars root crown fusion case report Nanyang City, Henan Province Oral Hospital Maxillofacial Surgery Liu Zhongyin, Li Wei patients Moumou, female, 70 years old, in July 1993 due to denture repair need to remove the second left maxillary molars. Check: maxillofacial no abnormalities, except the upper and lower jaw teeth, the teeth are missing, more serious alveolar ridge absorption, elongation, root bifurcation exposure, no loosening, percussion pain (─). Crown ...