1. As the occurring of spaces from the 3rd to 5th tooth of dogs, artificial intrabony pocket can be made, and their thick root canals are suitable for pulp and periapical study.
   犬的牙间间隙宽,适合作人工牙周骨下袋模型,牙虽不患龋,但根管粗,可用于髓病、根尖周病研究;

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