Yang Liu

Dalian Medical University

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Yan Wang

Zhejiang Cancer Hospital

Haibo Jia

Huazhong University of Science and Technology

Shaotao Zhang

Harbin Medical University

Pan Liu

Wuhan University

Chao Wang

Second Affiliated Hospital of Zhejiang University

Hongyi Fan

Sichuan University

Chunyang Zhe

Harbin Medical University

Chengcheng Yan

China University of Petroleum, Beijing

Jinbao Ma

Southwest Petroleum University

Weidong Zhao

China Medical University

Cooperative Institutions

Harbin Medical University

Second Affiliated Hospital of Harbin Medical University

Dalian Medical University

First Affiliated Hospital of Dalian Medical University

Huazhong University of Science and Technology

Sichuan University

Heilongjiang University of Chinese Medicine

Ministry of Education of the People's Republic of China

Nanjing Medical University

Wuhan University

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Analysis of the influence of a new type of buccal tube base mesh design on the adhesive layer stress distribution and bond strength

Journal of Adhesion Science and Technology (2020)

Yang Liu Shan Zhou Xiao Han Chengcheng Yan Zhenglong Lei

The three-dimensional finite element method was used to analyse the effect of changing the buccal tube baseplate shape on the stress magnitude and distribution at the interface between the buccal tube and the adhesive layer in a buccal tube-adhesive layer-tooth continuum under shear and tensile loads. A stress regression analysis was used to select the optimum mesh design and was verified by in vitro bond strength testing. This study involved buccal tubes with triangular mesh bases (100–400 µm mesh lengths, 100–200 µm mesh spacings, and 0, 45 and 90° angles) and a traditional quadrilateral mesh base. A finite element model of the buccal tube, adhesive layer and tooth were established. The stresses in the adhesive layer-buccal tube interface were recorded under mesial loads, distal loads, vertical loads and tensile loads. The average bond strength was measured by debonding the buccal tube with a universal testing machine and crosshead at a speed of 0.5 mm/min. Increasing the mesh length and mesh spacing decreased the von Mises stress and the first principal stress at the triangular mesh base-adhesive interface. Further analysis showed that the lowest stress and maximum mean bond strength were exhibited by the triangular mesh base (400 µm mesh length, 200 µm mesh spacing). Changes in the shape and size of the base grids affected the stress magnitude and distribution at the adhesive layer interface. The optimal triangular mesh base design in this study provides new ideas for clinical applications.

10.1080/01694243.2020.1742961

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Effect of microwave plasma parameters on the surface modification of denture base resins

Ping Wang Yang Liu Huiyong Xu Weidong Zhao Xiang-yong Cheng

OBJECTIVE To explore the working parameters of the microwave plasma for surface modification of denture base resins. METHODS Using orthogonal test method, 80 specimens of denture material were divided into 16 groups for testing. At the gas flow of 13.7 cm3/min, the specimens were tested under the working condition of different microwave powers (100, 150, 200 and 250 W), different gasses (oxygen, air, argon, oxygen and argon mixture), different gas pressure (0.4, 0.6, 0.8, and 1 kPa), and varying processing time (1, 2, 5, and 8 min). Each group of specimens was treated with the microwave plasma and the contact angles were confirmed by scanning electron microscopy. RESULTS The pictures of instantaneous droplet morphology were obtained from each group of samples, and the values of contact angle were measured. The contact angle was 68.86 degrees in the untreated group, and the angles of several treated groups were 48.15 degrees , 40.7 degrees and 32.76 degrees, showing a statistically significant variation of the contact angle after the treatment. CONCLUSION Processing time of 8 min, microwave power at 100 W, total pressure in the chamber at 0.8 kPa, and the presence of oxygen constitute the optimal condition of microwave plasma for surface modification of denture base resins. Under these conditions, the smallest contact angle of the denture base resins is 34.58 degrees, suggesting a good effect of surface modification.

Base (topology)

Surface Modification

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Effect of hot etching with HF on the surface topography and bond strength of zirconia

Frontiers in Materials (2022)

Zhuoran Liang Yang Liu Yulin Jiang Pan Liu Yannan Zhang

Zirconia has occupied an increasingly important role in oral clinical applications in recent years. However, how to achieve the ideal bonding effect of zirconia is a significant problem that needs to be solved urgently in oral clinics. Hot etching treatment of zirconia is a hot spot of current research, but it is still unclear about the optimal acid solution and the effect of hot etching on the surface topography and bond strength of zirconia. This study evaluated the effect of hot etching with HF and HCl on the surface topography, roughness, crystalline phase, zirconia/resin cement interfacial evaluation and shear bond strength of zirconia. The results showed that the hot etching groups produced completely different topographical changes on the surface of zirconia than the sandblasting group. Obvious interfacial cracks were observed in the sandblasting group. The HF hot etching group achieved the highest roughness values (78.17 ± 4.94 nm) and the highest shear bond strength (25.09 ± 4.09 MPa). Compared with HCl, hot etching with HF could achieve more uniform and dense porous morphology, greater roughness and shear bond strength. Moreover, there were no prominent zirconia/resin cement interfacial cracks and crystal phase transformations on the surface of zirconia.

10.3389/fmats.2022.1008704

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The Nanomechanical and Tribological Properties of Restorative Dental Composites after Exposure in Different Types of Media

Journal of Nanomaterials (2014)

Hongyi Fan Xueqi Gan Yang Liu Zhuo-Li Zhu Haiyang Yu

The aim of this study was to evaluate the effects of various acidic solutions on the surface mechanical properties of commercial resin composites with different microstructures (Filtek Z350 XT, TPH 3 , Durafill, and Superlux). Specimens were immersed in orange juice, cola, and distilled water for 5 days and the nanohardness, elastic modulus, and wear behavior of the samples were determined via the nanoindentation test and a reciprocating nanoscratch test. The nanoscratch morphology was observed using scanning electron microscopy (SEM) and the wear depth was recorded by scanning probe microscopy (SPM). The results indicate that the nanofilled resin composites had the greatest hardest and highest elastic modulus, whereas the microfilled composites exhibited the lowest nanohardness and elastic modulus values. SEM observations showed that all resin composites underwent erosion and surface degradation after immersion in acidic solutions. Furthermore, the wear resistance was influenced by the composition of the acidic solution and was correlated with the nanohardness and elastic modulus. The dominant wear mechanism changed from plastic deformation to delamination after immersion in acidic solutions.

Distilled water

Reciprocating motion

10.1155/2014/759038

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Citations (17)

SYSTEMIC PENTRAXIN 3 IS A POTENTIAL BIOMARKER TO DIFFERENTIATE PLAQUE EROSION FROM PLAQUE RUPTURE IN ACUTE CORONARY SYNDROME PATIENTS

Journal of the American College of Cardiology (2017)

Irina Mustafina Sining Hu Haibo Jia Gonghui Zheng Wei Liu

Vulnerable plaque

10.1016/s0735-1097(17)34669-7

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