汞对雌性小鼠生殖功能及脏器的影响

为探讨汞化合物对脏器及生殖的毒性,采用卵母细胞体外培养,体外受精的方法研究了汞对小鼠脏器系数,卵母细胞成熟和受精能力的影响。结果表明,０．５和１．５ｍｇ／ｋｇ ＢＷ汞对小鼠的肝脏,肾脏有明显的毒性作用１．０ｍｇ／ｋｇ ＢＷ组还对卵巢有明显的毒性作用,并能显著降低超排卵的细胞数;汞对体内抑母细胞生发泡破裂没有影响,但可以抑制卵母细胞第一极体的释放,影响卵母细胞的存活率并降低体外受精率。     

Transient apical breakdown of a discoloured maxillary central incisor during orthodontic treatment: A case report

Transient apical breakdown (TAB) appears to be a repair process taking place in the pulp and periapical area of traumatised teeth which may display crown discoloration and have no responses to pulp sensitivity tests. Few TAB cases induced by orthodontic forces have been reported so far. Presented is a case report in which TAB occurred on the maxillary right central incisor during orthodontic treatment. The affected tooth suddenly displayed crown discoloration and had no response to pulp testing at 6 weeks after the placement Invisalign Clear Aligner appliances. Condition of the discoloured tooth was monitored by periodic recall examinations without any active treatment. Six months after the occurrence of discoloration, the affected tooth recovered to its original shade and responded normally to pulp sensitivity tests.