Wei-shan Ding

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PURPOSE To compare the metal-ceramic bonding strength of different ceramic alloies. METHODS 30 wax sheets were divided into 6 groups at random. Each group included 5 sheets. After being invested conventionally with Bellaves SH,the samples were casted and fused with porcelain.The metal-ceramic bonding strength was evaluated. RESULTS The highest bonding(More)
OBJECTIVE The purpose of this study was to evaluate the effect of degradation of human root dentin collagen treated with collagenase after demineralization. METHODS The root dentin samples were demineralized by incubating with PH5.0 lactate acid at 37 degrees C. The incubation solutions were taken on days 1, 7, 14, 21 and 28, and centrifuged 10,000r/min(More)
OBJECTIVE To study the influence of cervical settling method on marginal accuracy of wax patters. METHODS 24 wax patterns were made on the standard cast specimens and round capsules of which twelve patters were made with the method of cervical settling (experiment group), twelve patters were made with the method of wax dripping (control group). Marginal(More)
OBJECTIVE To evaluate the clinical value of dental implants including Brånemark, Steri-oss and BLB systems. METHODS The total 384 implants of different materials and shapes were inserted normally. According to the Chinese standard of dental implantation, the success rates of three types were compared. RESULTS By following-up from one year to five years,(More)
Zirconia material has a very broad application prospect in prosthodontics,and restorations made of zirconia through CAD/CAM technology have been applied widely in recent years. In this paper we summarized the features of zirconia material which used for all ceramic restorations and the factors which affected its flexural property. We also sated the relevant(More)
OBJECTIVE The purpose of this study was to observe the effect on marginal seating of the castings with and without ring investments. METHODS Standarded as-cast specimens and round capsules simulated post tooth crowns were made. 12 wax pattern were prepared on the as-cast specimens. The 12 specimens were divided into two groups with 6 wax pattern in each(More)
Human stem cells have a major effect in the development of human bodies. Acting as an in vitro model, human stem cells have a great value in the study of the mechanism of individual development and in the cell-replacement treatments and gene therapy of tissue deficiency diseases. The study of stem cells has been given rise to a keen interests in the(More)
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