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Based on the data of land use, urbanization rate and green cover in Chengdu from 2005 to 2020, landscape pattern index and regression analysis were used to explore the evolution of landscape pattern and its influencing factors in Chengdu in the past 15 years. The results showed that arable land, forest and artificial construction land were the main landscape types, and the area of the three landscape types changed significantly. Arable land landscape was the most dominant landscape, but its area decreased and the degree of fragmentation increased. The area of forest landscape increased year by year, and the degree of fragmentation decreased. The area of artificial construction land increased significantly, the degree of fragmentation increased, and the landscape dominance gradually increased. The overall trend of urban landscape fragmentation was that the connection degree of dominant landscape types gradually decreased, the degree of agglomeration decreased and the complexity increased, and the proportion of each type of landscape tended to be balanced. Urbanization rate was significantly correlated with landscape spread and diversity index. With the increase of urbanization level, the agglomeration degree of various landscapes in Chengdu decreased. Policy factors played an important role in the evolution of landscape patterns. Influenced by the “Park City” policy, the green coverage rate and the area of forest, shrub and grassland increased significantly in 2018. Land use policy was the main factor affecting the change of artificial construction and cultivated land area. The future land use planning should pay attention to the protection of cultivated land. [ABSTRACT FROM AUTHOR]

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Copyright of West China Journal of Stomatology is the property of Sichuan University, West China College of Stomatology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: A review of previous epidemiological investigations shows that the detection rate of malocclusion is the highest in Angle I, but the classification is limited by the failure to consider the comprehensive mechanism of the formation of malocclusion in the three-dimensional direction of the length, width and height of teeth, jaws and facial structures, and the profound impact of the position of the mandible and facial bones on a person’s appearance. Therefore, the morphological characteristics of the mandible and chin should be fully considered before orthodontic treatment. OBJECTIVE: To compare the similarities and differences of the three-dimensional facial morphology in adult females with different vertical skeletal types of skeletal Class I by measuring the three-dimensional morphology of the chins and mandibles through cone-beam CT multi-planar reconstruction. METHODS: According to SN-MP angle, the cone-beam CT images of 86 females with skeletal Class I aged from 18 to 35 years were imported into MIMCS19.0 to make multi-planar reconstruction, and then the data was divided into three groups: < 29° (low angle group, 30 cases), 29°-39° (average angle group, 30 cases), and > 39° (high angle group, 26 cases). Then, the mandibular linear distance and angle were measured, and the mandibular outline was measured through the three-dimensional reconstruction. RESULTS AND CONCLUSION: With the increase of mandibular plane angle, the morphology of mandible tended to be: (1) the mandible ascending ramus became shorter, and the mandible body grew; (2) the notch of mandibular angle deepened gradually, and the opening of the mandibular angle increased gradually relative to the cranial-jaw; (3) the alveolar process of the chin became longer and the shape of chin became gentle; (4) counterclockwise rotation of the chin and compensatory inclination of lower anterior teeth towards tongue occurred. Comparing different vertical skeletal types of skeletal Class I in adult females, both the morphologies of the mandible and chin are different, and the mandibular plane angle is related to the morphology of the mandible and chin. [ABSTRACT FROM AUTHOR]

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)