Henrikson C O
J Periodontol. 1979 Apr;50(4 Spec No):30-4. doi: 10.1902/jop.1979.50.4s.30.
Small changes in alveolar bone mass are very difficult to detect using radiograms. A method is described for registering minute changes in bone mass in restricted parts of the jaw. The method is based on the use of collimated monenergetic radiation from 125I and replacement of the roentgen film by a non-image forming detector. As the apparatus also can be used for measuring the object thickness, the attenuation formula can be used for calculating the alveolar bone mass. The radiation dose can be kept an extremely low level and the reproducibility of the measurements is high. The technique therefore may be used for long-term studies of changes in alveolar bone mass. The alveolar bone mass responds rapidly to changes in the neighboring tissues. The reaction following gingivectomy or dental trauma is characterized by a significant loss of alveolar bone mass initially. After 4 weeks an increase in the alveolar bone mass is noted and found to continue during the subsequent months.
使用X光片很难检测到牙槽骨量的微小变化。本文描述了一种记录颌骨受限部位骨量微小变化的方法。该方法基于使用来自125I的准直单能辐射，并使用非成像探测器代替X光胶片。由于该设备还可用于测量物体厚度，因此衰减公式可用于计算牙槽骨量。辐射剂量可保持在极低水平，测量的重现性很高。因此，该技术可用于牙槽骨量变化的长期研究。牙槽骨量对邻近组织的变化反应迅速。牙龈切除或牙齿创伤后的反应最初表现为牙槽骨量显著减少。4周后，牙槽骨量开始增加，并在随后的几个月持续增加。
