Objective: To evaluate fracture resistance of teeth restored with inlay restorations of direct and indirect composite resin. Methods:Three dimensional finite element analysis (3D FEA) was used in present research. Two types of load were applied to investigate the change of tooth fracture resistance after restored with MOD inlay. Group 1,2,3,and 4 were restored with four kinds of materials:group 1,indirect composite resin inlay( Tescera, Bisco USA);group 2, direct composite inlay(Renew Bisco USA);group 3,ceramic; and group 4, Co-Cr alloy. Defect tooth or intact one was served as the control group. Results:Tooth fracture resistance in group 1,2,3 and 4 were improved, Fracture resistance in group 1 and 2 were similar to intact tooth group, while the fracture resistance in group 3 and 4 was different effect when compared to intact tooth. Conclusion: Both direct and indirect composite resin inlay could strengthen fracture resistance of restored teeth. No obvious difference between direct and indirect composite resin on tooth resistance was found.

Objective:This study aims to analyze of the quality of diagnosis and treatment data of community medical institutions on the national health information platform in a district of Beijing from the perspective of scientific research informatization, to provide experience and reference for promoting the informatization construction of primary medical units and tapping the scientific research potential of the regional data platform.Methods:Based on the data backup database of the national health information platform in the region, the data quality was analyzed and evaluated mainly in three dimensions: integrity, integration, and consistency.Results:Through the construction of the national health information platform, the district successfully achieved the effective collection of diagnosis and treatment data from community medical institutions, covering the main data such as patients′ basic information, visit information, test information, prescription information, etc. However, the data collected so far were still insufficient in terms of data integration and consistency.Conclusions:A regional medical data center is suggested to construct to break down the barriers between data systems, conduct pre-structuring of diagnosis and treatment data, improve data integration and consistency, and at the same time, carry out effective scientific research prospective design to promote the effective transformation of clinical data to scientific research data.