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;