Histopathological changes in tooth structures in dogs with calculus have not been described. The aim of this study was to evaluate the frequency of various histopathological changes in the dentine of teeth that had been surgically extracted from dogs with calculus. Data including breed, sex, age, reason for tooth extraction and dental history were obtained for each animal. A total of 158 teeth (45 incisors, 31 canines, 35 premolars and 47 molars) with calculus were extracted from 74 dogs of various ages and breeds. The teeth were decalcified, processed in paraffin wax and stained with haematoxylin and eosin for histopathological analysis. Of the 158 analysed teeth, 71 had dentinal changes, including 45 with external resorption cavities, 11 with osteodentine, six with internal resorption cavities, four with tertiary dentine, four with dentinal degeneration or fragmentation, and one with predentine degeneration or fragmentation. Canine teeth were the least commonly affected. Areas of dentinal degeneration or fragmentation unrelated to resorption cavities were only seen in the incisor and molar teeth. Dentinal changes and their frequencies were similar among the incisor, premolar and molar teeth. The presence or extension of dental calculus was not associated with the type or frequency of dentinal changes.

尚未描述患有牙结石的狗的牙齿结构的组织病理学变化。本研究的目的是评估从患有牙结石的狗身上手术拔出的牙齿的牙本质中各种组织病理学变化的频率。获得每只动物的数据，包括品种、性别、年龄、拔牙原因和牙科病史。从 74 只不同年龄和品种的狗中提取了总共 158 颗有牙石的牙齿（45 颗门牙、31 颗犬齿、35 颗前磨牙和 47 颗磨牙）。牙齿被脱钙，在石蜡中处理并用苏木精和伊红染色用于组织病理学分析。在分析的 158 颗牙齿中，71 颗有牙本质变化，其中 45 颗有外部吸收腔，11 颗有骨牙本质，6 颗有内部吸收腔，4 颗有第三牙本质，4个有牙本质变性或碎裂，1个有牙本质变性或碎裂。犬齿是最不常受影响的。与吸收腔无关的牙本质退化或碎裂区域仅见于切牙和磨牙。切牙、前磨牙和磨牙的牙本质变化及其频率相似。牙结石的存在或扩展与牙本质变化的类型或频率无关。