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Yu-lou Tian,Fang Liu,Hong-jing Sun,Pin Lv,Yu-ming Cao,Mo Yu,Yang Yue 대한치과교정학회 2015 대한치과교정학회지 Vol.45 No.5
Objective: To assess the labial and lingual alveolar bone thickness in adults with maxillary central incisors of different inclination by cone-beam computed tomography (CBCT). Methods: Ninety maxillary central incisors from 45 patients were divided into three groups based on the maxillary central incisors to palatal plane angle; lingual-inclined, normal, and labial-inclined. Reformatted CBCT images were used to measure the labial and lingual alveolar bone thickness (ABT) at intervals corresponding to every 1/10 of the root length. The sum of labial ABT and lingual ABT at the level of the root apex was used to calculate the total ABT (TABT). The number of teeth exhibiting alveolar fenestration and dehiscence in each group was also tallied. One-way analysis of variance and Tukey’s honestly significant difference test were applied for statistical analysis. Results: The labial ABT and TABT values at the root apex in the lingual-inclined group were significantly lower than in the other groups (p < 0.05). Lingual and labial ABT values were very low at the cervical level in the lingual-inclined and normal groups. There was a higher prevalence of alveolar fenestration in the lingual-inclined group. Conclusions: Lingual-inclined maxillary central incisors have less bone support at the level of the root apex and a greater frequency of alveolar bone defects than normal maxillary central incisors. The bone plate at the marginal level is also very thin.
Xiao-Kang Li,Da-Feng Zheng,Tao Zheng,Xu-Liang Lin,Hong-ming Lou,Xueqing Qiu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
The dispersion ability of polycarboxylate ether (PCE) in fresh concrete is much impeded by clayimpurities. To improve the dispersion of PCE in the clay-contained concrete, lignin-based polyoxy-ethylene ether (PEG-grafted-lignin) was synthesized through polyethylene glycol (PEG) grafted to kraftlignin (KL). The results showed that PEG-grafted-lignin increased thefluidity of MMT-contained cementpaste when combined with PCE. It improved the rheological properties of MMT-contained cement pasteby reducing the yield stress and the rheological behavior index. The adsorption of PEG-grafted-lignin onMMT was more quickly than KL and the equilibrium adsorption amount was 31.43 mg/g at an initialconcentration of 100 mg/L. XRD revealed that PEG-grafted-lignin had inserted into the interlayerstructure of MMT, while DLS disclosed the spatial effect of PEG-grafted-lignin was much stronger thanPCE. This study put forward a new method in the anti-sludge study of PCE.