Schroeder H E
Abteilung für Orale Strukturbiologie, Zahnärztliches Institut, Universität Zürich.
Schweiz Monatsschr Zahnmed. 1993;103(2):141-9.
A total of 21 extracted, vital human canines (i.e., 8 maxillary and 13 mandibular) of patients between 40 and 78 years of age has been used to study, by means of X-rays and scanning electron microscopy, the age-related restriction of the pulp chamber and of the root canal, and the structure of its inorganic dentinal walls. This was done at the mesial and distal as well as the vestibular and oral aspects of the pulp chamber walls. In addition, the density of the openings of the dentinal tubules was, under standardized conditions, determined at the coronal part of the pulp chamber, in the middle of the root canal and apically on each of the four aspects of the pulp chamber, i.e. vestibularly, mesially, orally and distally. The results demonstrated that (1) pulp chamber and root canal of both maxillary and mandibular canines, with increasing age of the patients, does not become very much restricted in the vestibulo-oral direction and only very little or patchwise in the mesio-distal direction, (2) fibrodentin that causes such restriction, is deposited in greater amounts only after 60 to 70 years of age, and (3) the density of the tubules is very variable, rather similar in the coronal crown chamber and the middle of the root canal, both mesio-distally and vestibulo-orally, and decreases sharply towards the root apex. These findings are discussed mainly with respect to the age-related changes in the pulp chamber and root canals of human central and lateral incisors.
共使用了21颗40至78岁患者拔除的活人类犬齿（即8颗上颌犬齿和13颗下颌犬齿），通过X射线和扫描电子显微镜研究牙髓腔和根管随年龄增长的限制情况及其无机牙本质壁的结构。研究在牙髓腔壁的近中、远中以及前庭和口腔面进行。此外，在标准化条件下，测定了牙髓腔冠部、根管中部以及牙髓腔四个面（即前庭面、近中面、口腔面和远中面）根尖处牙本质小管开口的密度。结果表明：（1）上颌和下颌犬齿的牙髓腔和根管，随着患者年龄的增加，在前庭 - 口腔方向上受限程度不大，在近中 - 远中方向上仅略有受限或呈局部受限；（2）导致这种限制的纤维牙本质仅在60至70岁后大量沉积；（3）牙本质小管的密度变化很大，在冠部牙髓腔和根管中部，近中 - 远中方向和前庭 - 口腔方向上相当相似，并且朝着根尖急剧降低。主要针对人类中切牙和侧切牙髓腔及根管的年龄相关变化对这些发现进行了讨论。
