不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。
Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.
裂齿：上颚最后的一只前臼齿，下颚最前的一只臼齿。
Carnassial: Last premolar of upper jaw, first molar of lower jaw.
摘要上颚阻生犬齿是混合齿列期常遇见的问题。
An impacted maxillary canine is a frequently encountered clinical problem in the mixed dentition.
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