Application of optical illusion in stomatological aesthetics / 口腔疾病防治

@#Optical illusion refers to the phenomenon in which the scene observed by the human eye is not completely consistent with the objectively presented scene. Optical illusions in stomatology, as well as their clinical application, are demonstrated in this paper in terms of shade, shape and aesthetic design. Shade is not only affected by the optical illusions with which it is associated, such as color metamerism, color constancy and the Chevreul illusion, but also influenced by the surroundings. It is suggested that the surrounding lighting during veneering should be the same as that during color matching in the clinic. As indicated by the Poggendorf illusion and the Leaning Tower illusion, the practice should be conducted and checked from multiple perspectives to compensate for the limitation of human eyes, such as intraoral scanning. Other digital technologies, including digital facial scanning and cephalometric measurement, could be used to reduce the subjective influence of observation. In terms of esthetic design, the interaction of the part and the whole, suggested by Ebbinghaus illusion, should be considered: an individual harmony smile should be designed considering the characteristics of the personality and the features of the face, lips, teeth and gingiva of the patient. Furthermore, personal information, such as gender and age, should be taken into consideration in beautification presentation. Further research should be focused on the influence of optical illusions in stomatology in more details. More communication among doctors, technicians and patients is needed. Clinicians should be aware of the impact of optical illusions to reduce subjective bias in clinical standardized operations and further take advantage of optical illusions to create beautification presentations of dental restorations and smiles.

Rapid 3D reconstruction based on wiggle stereoscopy for cerebrovascular CT images / 医疗卫生装备

To explore rapid 3D reconstruction based on wiggle stereoscopy for cerebrovascular CT images to e-liminate the complicacy and inconvenience of the traditional methods. Focal parts of cerebrovascular CT images were segmented based on intelligent neural network fusion model. A 3D human body model base was established, and the focal parts were replaced with the corresponding ones in the base to realize cerebrovascular CT images 3D reconstruction. The 3D human body model base enhanced the efficiency of the cerebrovascular CT images 3D reconstruction greatly. The rapid reconstruction based on wiggle stereoscopy facilitates the display of cerebrovascular CT im-ages.