Stein T J, Corcoran J F
Allen Park Veterans Administration Medical Center.
Oral Surg Oral Med Oral Pathol. 1990 Feb;69(2):238-42. doi: 10.1016/0030-4220(90)90334-o.
There were 87 vital and 24 nonvital teeth for a total of 111 specimens from 47 patients. The specimens were prepared to a thickness of 500 microns with a Buehler Isomet Bone Saw. Distances were measured and recorded with a Bioquant II Image Analysis System. The mean age of the patients was 48.9 years. The median age was 52 years. The range was 51 years, with a maximum of 77 years and a minimum of 26 years. There is a positive correlation, which could not have occurred by chance, that as age increases the deviation and the width of the foramen opening both increase. This increase appears to be a result of apical cemental thickening that occurs as the patient ages. The tissue in the apical area seems to be capable of generating additional cementum as the tooth ages. The cementodentinal junction width, or most apical extent of the dentin, remains constant.
来自47例患者的111个标本中，有87颗活牙和24颗无活力牙。使用Buehler Isomet骨锯将标本制备至500微米的厚度。用Bioquant II图像分析系统测量并记录距离。患者的平均年龄为48.9岁。年龄中位数为52岁。年龄范围为51岁，最大为77岁，最小为26岁。随着年龄的增长，孔口的偏差和宽度都增加，二者存在正相关关系，且这种相关性不可能是偶然发生的。这种增加似乎是随着患者年龄增长根尖牙骨质增厚的结果。随着牙齿年龄的增长，根尖区域的组织似乎能够生成额外的牙骨质。牙骨质牙本质界宽度或牙本质的最根尖范围保持不变。
