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- 저자 : Chaowen Huang (검색결과 2 건)
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Tianguo Wang,Chaowen Huang,Gaofeng Du,Yang Liu,Jianfeng Xie,Huan Li 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.4
Magmatism in the Huili area (SW margin of the Yangtze block) was active during the early Mesoproterozoic, and has important implications on the early tectonic evolution of the Yangtze block. We report new data in petrology, whole-rock geochemistry, zircon U-Pb and Hf isotopes for the Yaopengzi dolerite in the Huili area. LA-ICP-MS zircon U-Pb dating of the dolerite yielded an early Mesoproterozoic age of ca. 1515–1513 Ma, coeval with the Columbia supercontinent breakup. The dolerite belongs to the alkali basalt series, and is enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE), resembling typical oceanic island basalt (OIB) in geochemistry. Zircons from the Yaopengzi dolerite yielded 176Hf/177Hf = 0.28192–0.28203 and εHf(t) = –0.3 to 5.3. Our integrated study suggests that parental magma of the Yaopengzi dolerite may have originated from the enriched mantle, and was slightly contaminated by crustal materials during its evolution. Combining with regional tectonic background, the early Mesoproterozoic mafic magmatism at/around Yaopengzi may have formed in a mantle plume-related intracontinental rift setting. This reflects that the early Mesoproterozoic extension in the Yangtze block may have resulted from mantle plume activities led by the Columbia supercontinent breakup.
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Biometry of width between labial transitional line angles in anterior teeth: an observational study
Chao Wen,Hongqiang Ye,Hu Chen,Yongsheng Zhou,Mingming Huang,Yuchun Sun 대한치과보철학회 2022 The Journal of Advanced Prosthodontics Vol.14 No.1
PURPOSE. The maximum width between the mesial and distal labial transitional line angles, described as “esthetic width” herein, could significantly influence the visual perception of the teeth and smile. This study aimed to conduct biometric research on esthetic width and to explore whether regular distribution exists in the esthetic width of human teeth. MATERIALS AND METHODS. A total of 4,264 maxillary and mandibular anterior teeth were measured using the Geomagic studio software program. The proportions of maxillary to mandibular homonymous teeth and proportions between the adjacent teeth were calculated. Bilateral symmetry and the correlation between the esthetic and mesiodistal widths were both accounted for during the measurement procedures. RESULTS. The mean esthetic widths were 6.773 ± 0.518 mm and 4.329 ± 0.331 mm for maxillary and mandibular central incisors, respectively, 5.451 ± 0.487 mm and 5.008 ± 0.351 mm for maxillary and mandibular lateral incisors, respectively, and 3.340 ± 0.353 mm and 5.958 ± 0.415 mm for maxillary and mandibular canines, respectively. Except for the mandibular canines, no significant difference in esthetic width was found among homonymous teeth from the same jaw. A high linear correlation was found between the esthetic and mesiodistal widths of the same tooth, except for the maxillary canines. Esthetic width proportions among different tooth categories showed some regular patterns, which were similar to those of the mesiodistal width. CONCLUSION. Esthetic width is regularly distributed among the teeth in the Chinese population. This could provide an important reference for anterior dental restorations and dimension recovery in esthetic reconstruction of anterior teeth.
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