患儿，男性，7岁，因<img src="/Image1/11/1139cf0e0bb8745a1f88cb1496ce81e5.jpg" />萌出已1年，<img src="/Image1/5e/5e30b06dfc1a7c09a8260743dec68e8f.jpg" />仍未萌出前来就诊，无其他不适。无全身性、系统性疾病。临床检查发现<img src="/Image1/38/38e1dcfadcc06259ade9ec6c35aff160.jpg" />邻面龋坏，松动Ⅰ度，X线检查<img src="/Image1/38/38e1dcfadcc06259ade9ec6c35aff160.jpg" />牙根吸收约1／2，无明显根尖阴影。<img src="/Image1/84/848de614caaaf9906cf342ac5de1a1c4.jpg" />牙根形成约1／3，未见明显异常。正确的诊断是（）<br>A:<img src="/Image1/38/38e1dcfadcc06259ade9ec6c35aff160.jpg" />滞留<br>B:<img src="/Image1/5e/5e30b06dfc1a7c09a8260743dec68e8f.jpg" />迟萌<br>C:<img src="/Image1/11/1139cf0e0bb8745a1f88cb1496ce81e5.jpg" />早萌<br>D:<img src="/Image1/38/38e1dcfadcc06259ade9ec6c35aff160.jpg" />慢性根尖周炎<br>E:<img src="/Image1/5e/5e30b06dfc1a7c09a8260743dec68e8f.jpg" />萌出困难