题目内容

某患者因进食时咬到沙石后，右上第一磨牙近中舌尖劈裂缺损，牙本质外露，但未露髓，金属烤瓷全冠修复。半年后患牙出现自发性疼痛，冷热刺激疼痛加重。最可能的诊断为

A. 急性牙髓炎
B. 慢性牙髓炎
C. 慢性根尖周炎
D. 咬合创伤
E. 牙本质过敏

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