カイウサギ切歯の異常発育例について

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A case with abnormally grown incisors was found, on the 84th day after birth, among a group of domestic rabbits raiset with solid feed. Morphological and histological (non-decalcified method) observations of the incisors were therefore made. The results were as follows : 1. The left maxillary incisor curved toward the oral lateral side and formed a halfloop, as in the reports heretofore made by others. Its tip was at a position where it would press against the upper buccal mucous membrane. The right maxillary incisor had an appearance of a fracture along the way. Both of the mandibular incisors grew in the direction of the normal eruption. The measurement for each tooth was as follows : [numerical formula] Of the normal in the same 6.5 6.3 4.6 4.6 litter u=mm 2. The cause of this abnormal growth was attributed to a lack of contact between the antagonistic incisors due to mandibular protrusion. 3. In order to investigate the rate of growth of the incisors, an experiment on the left maxillary incisor was conducted. With the net ten days of raising (94th day after birth), a growth of 3.2mm (0.32 mm per day) was observed. The rate of growth was greater than those of the normal teeth reported by others (refer to the Table 2). 4. The overall histological structure of the incisors, showed no greater difference from those of the normal ones. In details, quatitative proportion of the irregular dentin in the tip of the narrowed dental pulp near the gingival margin was small. The tip of the dental pulp continued without calcifying to the tip of the abnormally grown incisor. 5. Some findings, not reported in the papers heretofore made by others, concerning the distribution of cementum were made by comparison with the normal teeth. The distribution of the primary cement extended not only to the ventral dentin of the incisor but also to the mesial and distal sides of the enamel. Furthermore, an addition of the secondary cement was recognized in the longitudinal grooves of the dorsal enamel.
九州歯科学会の論文
1978-11-30

カイウサギ切歯の異常発育例について

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