Short E, Johnson R B
Faculty of Dentistry, Department of Anatomy, University of Manitoba, Winnipeg, Canada.
Anat Rec. 1990 Aug;227(4):391-6. doi: 10.1002/ar.1092270402.
There is little information about the effects of short-term non-hypo-, and hyperfunction of teeth on the 1) mineralization patterns of intrinsic and extrinsic (Sharpey's) fibers and 2) mean number and diameter of Sharpey's fibers of adjacent alveolar bone. The mineral density of intrinsic and Sharpey's fibers and the size and number of Sharpey's fibers could indicate the relative strength of the attachment of a tooth to bone in various functional situations. In the present study, non- and hypofunctional situations were created by selective extraction of right molar teeth of the rat; the contralateral teeth were placed in hyperfunction by the surgery. In non- and hypofunctionals, intrinsic and Sharpey's fibers of the crestal third of the alveolus were less densely mineralized than in hyperfunctionals or untreated controls. Mean Sharpey's fiber diameters were significantly greater and their mean number/unit area significantly less in non- than in hypo- or hyperfunctionals or untreated controls (P less than 0.001). Mean Sharpey's fiber diameters in hyperfunctionals were significantly less than in untreated controls (P less than 0.05). Hypofunction ameliorated the effects of nonfunction on mean diameter and number of Sharpey's fibers, but had little effect on the density of mineralization of either the intrinsic or Sharpey's fibers of the alveolus, suggesting that their mineralization may be controlled by factors other than occlusal forces from the adjacent teeth. Thus changes in the stress/strain environment within the periodontium, coincident to altered occlusal function of the adjacent teeth, rapidly affects the morphology of intrinsic and Sharpey's fibers of alveolar bone and ensures that adequate tooth support is maintained in the new functional situation.
关于牙齿短期非功能低下和功能亢进对1）固有纤维和外源性（沙比纤维）纤维矿化模式以及2）相邻牙槽骨沙比纤维的平均数量和直径的影响，目前几乎没有相关信息。固有纤维和沙比纤维的矿物质密度以及沙比纤维的大小和数量，可以表明在各种功能情况下牙齿与骨附着的相对强度。在本研究中，通过选择性拔除大鼠右侧磨牙来制造非功能和功能低下的情况；通过手术使对侧牙齿处于功能亢进状态。在非功能和功能低下的情况下，牙槽嵴顶三分之一处的固有纤维和沙比纤维的矿化程度低于功能亢进或未处理的对照组。与功能低下、功能亢进或未处理的对照组相比，非功能情况下沙比纤维的平均直径显著更大，其单位面积的平均数量显著更少（P小于0.001）。功能亢进情况下沙比纤维的平均直径显著小于未处理的对照组（P小于0.05）。功能低下改善了非功能对沙比纤维平均直径和数量的影响，但对牙槽固有纤维或沙比纤维的矿化密度影响不大，这表明它们的矿化可能受相邻牙齿咬合力以外的因素控制。因此，与相邻牙齿咬合功能改变同时发生的牙周组织内应力/应变环境的变化，会迅速影响牙槽骨固有纤维和沙比纤维的形态，并确保在新的功能情况下维持足够的牙齿支持。
