[单项选择]患者，男，45岁，诉进食时牙酸痛。检查：双侧上颌第一前磨牙颊侧颈部缺损，未见龋坏及隐裂纹，颊侧牙龈萎缩，口腔卫生良好，每日刷牙两次，造成楔状缺损后最先有可能引发的牙体疾病为（）
A. 慢性根尖周炎
B. 急性根尖周炎
C. 牙髓坏死
D. 牙本质过敏症
E. 慢性牙髓炎

{{B}}How Ice Cream Works{{/B}}
The U.S. ice cream industry sells about a million gallons of ice cream each year, dispensing cones, gallons, pints, sundaes and other desserts through grocery stores and ice cream shops, In fact, eight percent of all the milk produced in the U.S. ends up in a frozen dairy product.
{{B}}Ice Cream or Frozen Dessert {{/B}}
Not just any frozen treat can be called ice cream. In fact, the U.S. Department of Agriculture has specific rules that define what can and can’t be labeled "ice cream". To bear the "Meets USDA Ingredient Standard for Ice Cream" stamp, it has to contain at least 10 percent milk fat, and a minimum of six percent non-fat milk solids. A gallon has to weigh at least 4.5 pounds.
The range of milk fat (sometimes referred to as butter fat) used in ice cream can go from the minimum 10 percent to a maximum of about 16 percent. Most premium ice creams us