ABSTRACT
From January,2011 to December,2013,103 cases were selected from patients whose residual roots and crowns were restored by porcelain fusedto metal crowns after post core crown restorations.Patients were fully in-formed and randomly divided into two groups,including 51 cases receiving the post core restoration with dental root canal nail,52 cases being repaired with glass fiber post core restoration.After 6 ~12 months of follow-up observa-tion,in the group having received post core restoration with the dental root canal nail,there were 2 cases of crown root fracture,4 cases of falling off,the success rate was 88.24% (45 /51).In the group of fiber post and core res-toration,there was 1 case of crown root fracture,1 case of falling off;the success rate was 96.15% (50 /52).The restoration of fiber post core and porcelain fused to metal crown is the best choice of restoration of residual crown and root,but the root canal nail of teeth with light cured resin core is more economical,simple,easy to operate, and suitable for basic use.
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Objective To study the cellular affinity of the inorganic active element bone scaffold materials. Methods The specific surface area, pore size distribution, porous ratio, permeability ratio of the inorganic active element bone scaffold materials were evaluated in vitro. Human marrow mesenchymal stem cells(MSCs) were cultured and identified by the flow cytometry, the third passage of the cells were used to culture with scaffold materials, to compare with the cells cultured with pure fetal calf serum as the control group. MTT assay was used to examine the effects of scaffold materials on MSCs viability, the growth of cells was observed by scanning electron microscope (SEM). Results The specific surface area of the inorganic active element bone scaffold materials was 210 m2/g, mean pore size was 6 nm, porous ratio was 90 %, and permeability ratio was34 %. MTT assay showed significant difference in the number of cells between the scaffold materials and the control group (P ＜ 0.05 ) on the seventh day, MSCs co-cultured with scaffold materials exhibited good growth as observed under SEM. Conclusion The inorganic active element bone scaffold materials possess preferable cellular affinity, which could be an overall-developed and high potential scaffold material of bone tissue engineering.
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Objectives:To find out the relation between main clinical character and telomerase activity in oral squamous cell carcinomas. Methods:Telomerase activity was detected by telomerase PCR ELISA assay in 12 cases of oral normal tissue and 45 cases of oral squamous cell carinoma. Results:Telomerase activity was not detectable in 12 cases of oral normal tissue. Telomerase activity was detected in 75.67 percent of oral squamous cell carcinomas. Telomerase activity was present more frequently in advanced oral squamous cell carinoma than in the early stage( P
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Objective: To evaluate the reliability and effects of a compound bone substitute materials Bio-oss artificial bone grafts with recombinant human bone morphogenic protein-2(rhBMP-2) filling the alveolar bone defects around heterogenous replanted teeth. Methods:3 dogs′ bilateral mandible 3rd premolars(6 sites) were extracted. The defect sites without buccal and lingual alveolar bone were prepared for the heterogenous implanted teeth and the compound of Bio-oss and rhBMP-2 filled the alveolar bone defects around. The bone regeneration was observed by naked eye, radiograph, histology and histomorphometric analysis after 2, 3 months. Results:The new alveolar bone showed osteogenesis and calcification after 2 months, and intergrated with implanted teeth root under the light microscope and X ray. The new bone trabecular thickness(Tb.Th) augmented continuously. Differences of the bone area(B.Ar) and bone perimeter(B.Pm) were statistically significant after 2nd and 3rd month(P