ABSTRACT
OBJECTIVE@#This study aimed to evaluate the stress distribution of the mandibular first molar with different thicknesses and heights of the axial wall restored by the endocrown with two marginal designs and thus provide a theoretical basis for selecting clinical preparation through the finite-element method.@*METHODS@#Two marginal endocrowns of the mandibular first molar with different axial-wall thicknesses (t=1, 2, 3 mm) and heights (h=2, 3, 4 mm) were established. Group A was the butt-joint design, whereas group B was the shoulder-surrounded design. After applying vertical and oblique loads , the size and distribution of the maximum principal stress and equivalent stress of residual tooth tissue were recorded.@*RESULTS@#The maximum principal stress and equivalent stress distribution of residual tooth tissue were similar among different models. Group A showed a lower maximum principal stress and equivalent stress than group B at the same thickness and height under vertical load. Meanwhile, under oblique load, the maximum principal stress values of groups A and B decreased with increased thickness at constant height. Group A showed lower equivalent stress than group B at the same thickness and height of 2 and 3 mm. However, when the height was 4 mm, the trend was reversed.@*CONCLUSIONS@#In mastication, when bearing the vertical force, the retention of the butt-joint marginal endocrown preferred to the shoulder-surrounded one. Given the higher axial wall of the shoulder-surrounded marginal endocrown, it showed better ability to bear the oblique force than the butt-joint one.
Subject(s)
Crowns , Dental Stress Analysis , Finite Element Analysis , Mastication , MolarABSTRACT
Emotion regulation is an important ability for individuals which can help them adapt to society better.The characteristics of patients with bipolar disorder are characterized by extremely unstable mood,associated with impaired emotion processing and mood dysregulation.This article reviews emotion regulation strategies of patients with bipolar disorder and their neural mechanisms.During the emotion regulation process,patients often use maladaptive regulation strategies.Their activation of the prefrontal cortex is abnormal,and the functional connectivity between prefrontal cortical regions and the amygdala is attenuated.This could also be the physiological basis of patients'difficulty in regulating emotions.
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The connotation of traditional Chinese medicine, source, and medicinal parts of bitter-taste Chinese materia medica (CMM) were summarized. And authors analyzed the relationship between bitter taste and four properties, meridian entry and other herb property theory as well as chemical ingredients. Then, authors described the use of electronic tongue of modern bionic technology in material characterization of bitter taste, and proposed the idea to split and characterize bitter-taste CMM which is based on systematic chemical separation analysis method. Finally, authors explored the clinical applications of compatibility methods of bitter-taste CMM, which will provide the references to guide clinical applications of the theory of bitter-taste CMM better.
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The connotation of traditional Chinese medicine and base resource of sweet-taste herbs were summarized. At the same time, the distribution between sweet-taste herbs and four properties, meridian entry, and other herb property theory was analyzed. Then, the gustatory receptor, taste representation, and research on material basis of sweet-taste herbs were elaborated. Finally, the clinical applications of compatibility methods of sweet herbs were described, which will provide the references to guide clinical applications of the theory of bitter-taste herbs better.
ABSTRACT
Authors summarized the connotation of traditional Chinese medicine (TCM) theory on the salty in five flavors of TCM and the distribution of base resource of salt-taste herbs. At the same time, the correlation between salt-taste and four properties, meridian, and other herb property theory was analyzed. Then, the authors elaborated the gustatory receptor, taste representation, and research of material basis of salt-taste. Finally, the authors described the clinical applications of compatibility methods of salt-taste herbs, which will provide the references to guide the clinical applications of the theory on salt-taste herbs better.