[Histological study of cell attachment and proliferation of periodontal ligament cells on the tooth surface. Effect of the fibronectin application].

The purpose of this study was to examine the effect of fibronectin on cell attachment and the growth of cultured cells on the surface of the dentin. In the first experiment, dentin specimens were divided into following three groups: dentin surface polished with carborundum-point, carborundum-point and #150 sandpaper and carborundum-point, #150 sandpaper and #240 sandpaper. The roughness of the surface was measured with a profilometer (Surfcom e-st-sa) for the purpose of comparing differences among the three groups. The foregoing treated samples were added to cultures of periodontal ligament (PDL) cells and following fixation, the number of cells was counted under a light microscope and examination under a scanning electron microscope (SEM) was also performed. 1. Greater numbers of cells attached to the smooth surface (#240) than the rough surface. 2. SEM observations showed increased numbers of attached and proliferated cells on the smooth surface. In the second experiment, the dentin surfaces were polished with carborundum point, #150 and #240 sand paper. The dentin tube side was treated with fibronectin. MEM-treated samples not immersed in fibronectin were employed as controls. The foregoing treated root samples were cultured with PDL cells. Following fixation, the cells attached to the root surface were examined under the light microscope and using a SEM. 1. A significant increase in the number of the attached cells as observed after treatment with fibronectin. 2. SEM observation suggested PDL cells migrated more and proliferated more on the side treated with fibronectin. 3. Fibronectin application increased cell attachment and proliferation more on the smooth surface of dentin.