Objective: To realize the requirement of adjacent area accuracy,axial surface physical contour and smoothness in the process of inlay computer-aided design(CAD).Methods:A compromised method was brought forward that some assistant 3-D constraint lines from occlusion to gingiva were used to lead the inlay contour on axial corner and other characterized areas,and two perpendicular 3-D constructing lines at adjacent area were used to construct accurate 3-D configuration of this area.The axial surface was completely defined by the network of specified curves which were two constructing lines and four borders.Results:Inlay axial surface was smooth,the contour was consistent with the residual tooth body and the 3-D configuration in adjacent area was accurate.Conclusion:It is feasible to realize the inlay axial surface accuracy,smoothness,and consistency using the method of special distributed 3-D B-Spline curve network.

Objective:To explore the route of automatic computer-aided design for occlusal rest of the removable partial denture.Methods: A new module for the design of occlusal rest was developed.The three-dimensional data of a partially dentate dental cast was obtained and imported into the new module.The contour of the occlusal's tissue surface was identified.Then,the tissue surface and polished surface were constructed respectively and connected to each other to form an integrated entity.Results: The surface of the occlusal rest was smooth and the curvature matched that of the surrounding area of the abutment tooth.The accuracy was satisfying.Conclusion: Design of occlusal rest was much more convenient and time-saving using the newly developed module.The future development of special software package for the design of removable partial denture will benefit from it.

Objective To investigate a retrieval strategy for dentistry literature based on medical subject headings (MeSH). Methods We analysed the MeSH Tree Structures of PubMed in 2009 and combined it with the core glossary of dentistry to find out highly frequent dental words in MeSH. Then 6 words were singled out from the whole MeSh Tree to apply for a retrieval strategy for dentistry literatures. Results 102,500 pieces of dentistry literature were obtained from the year 2006 to 2008. Conclusions This research strategy can improve the efficiency of literature search in dentistry field for clinical or laboratory researches.

Objective:To construct human adipose-derived mesenchymal stem cells (hASCs)-biomate-rial mixture 3D bio-printing body and detect its osteogenesis in vivo,and to establish a guideline of osteogenesis in vivo by use of 3D bio-printing technology preliminarily.Methods:P4 hASCs were used as seed cells,whose osteogenic potential in vitro was tested by alkaline phosphatase (ALP)staining and alizarin red staining after 1 4 d of osteogenic induction.The cells were added into 20 g/L sodium alginate and 80 g/L gelatin mixture (cell density was 1 ×1 06/mL),and the cell-sodium alginate-gelatin mixture was printed by Bioplotter 3D bio-printer (Envision company,Germany),in which the cells’survival rate was detected by live-dead cell double fluorescence staining.Next,the printing body was osteogeni-cally induced for 1 week to gain the experimental group;and the sodium alginate-gelatin mixture without cells was also printed to gain the control group.Both the experimental group and the control group were implanted into the back of the nude mice.After 6 weeks of implantation,the samples were collected,HE staining,Masson staining,immunohistochemical staining and Inveon Micro CT test were preformed to analyze their osteogenic capability.Results:The cells’survival rate was 89%±2% after printing.Six weeks after implantation,the samples of the control group were mostly degraded,whose shape was irregu-lar and gel-like;the samples of the experimental group kept their original size and their texture was tough.HE staining and Masson staining showed that the bone-like tissue and vessel in-growth could be observed in the experimental group 6 weeks after implantation,immunohistochemical staining showed that the result of osteocalcin was positive,and Micro CT results showed that samples of the experimental group had a higher density and the new bone volume was 1 8%±1%.Conclusion:hASCs-biomaterial mixture 3D bio-printing body has capability of ectopic bone formation in nude mice,and it is feasible to apply cells-biomaterial mixture 3D bio-printing technology in the area of bone formation in vivo.

Objective To study the clinical CT manifestations of infective ovarian cysts so as to improve diagnostic ability.Methods All the cases were evaluated on plane scan and enhancement scan.Their manifestations on CT were analysed.Results The cysts lying in the left ovary account for 14 cases, in the right ovary 4 cases. The size of cysts varied from 11 cm?10 cm?11 cm to 4 cm?3 cm?4 cm. The cyst walls thickened to some extent. 15 cases thickened “gradually”. 3 cases thickened “comparatively evenly”. The thickness of the cyst walls was over 1 cm, the thickest being 2 cm. The length of the thickened wall was more than one half circumference of the cyst, with smooth inner side.The cyst wall showed the density of soft tissues and it was mildly intensified after being enhanced.Conclusion The clinical CT manifestations of infective ovarian cysts have certain characteristics.

Objective: To acquire the 3D point-cloud of the dental casts of intercuspal position and rebuild it in computer. Methods:Aspecial scanning method was used to acquire the point-cloud of dental cast by using the D.02-L-3D SCANNER and rebuild the model by computer. Results: The method could acquire a 3D model with high resolving power and clear-cut dental anatomic configuration for the dental casts of intercuspal position. Conclusion: This is a viable method of scanning with many advantages, such as precision, simplicity , high efficiency. It could satisfy the requirements of clinical practice, teaching and scientific research.

Objective To investigate the effects of dexmedetomidine on sedation and inflammatory response in patients undergoing brachial plexus anesthesia, to provide a reference for the selection of sedative drugs in forearm traumatic patients undergoing brachial plexus block anesthesia .Methods 80 forearm traumatic patients underwent trauma surgery with brachial plexus nerve block from July 2015 to June 2016 were selected and randomly divided into two groups of dexmedetomidine group (dexmedetomidine group, D group) and normal saline group (control group, C group), each group of 40 cases.The mean arterial pressure (MAP), heart rate (HR) and blood oxygen saturation (SpO2) were recorded before operation (T0), incision (T1), 15 min (T2), 30 min (T3).Interleukin-1 (IL-1), interleukin-6 (IL-6) and tumor necrosis factor-α(TNF-α) were measured at different time points. At the same time, the Ramsay sedation score and the degree of amnesia after operation were measured.Results There were no significant differences in MAP, HR and SpO2 before anesthesia between the two groups.In group D, MAP and HR were significantly lower than those in group C at T1, T2, T3 and T4, the difference was statistically significant (P<0.05).There was no statistical difference in SpO2 between the two groups.The Ramsay sedation score of group D at T1 to T4 was significantly higher than that of group C, the difference was statistically significant (P<0.05).The levels of IL-1β, IL-6 and TNF-αin group D were significantly lower than those in group C at T1 to T4, the difference was statistically significant (P<0.05).Conclusion Dexmedetomidine has good curative effect on forearm traumatic patients with brachial plexus block and less hemodynamics changes , which is beneficial to patients'forgotten of operation and inhibition of inflammatory reaction in forearm traumatic patients.

Objective:To evaluate the actual measurement accuracy of 2 three-dimensional(3D)facial scanners for real person. Methods:3D digital face models of 1 0 volunteers with normal ficial form were obtained by 3dMD and FaceScan facial scanners respec-tively.The measurement values of 1 0 feature lengths and 5 feature angles were measured on each 3D model by the software respective-ly.The reference values of all characteristics were acquired by line laser scanner (Faro)with high accuracy.Statistical and surveying analysis were taken between the measurement values and reference values.Facial morphology measurement error and actual accuracy of facial scanners were obtained finally.Data were statistically analysed.Results:The length measurement accuracy of 3dMD and FaceS-can was(-0.37 ±0.68)mm and (-0.29 ±0.53)mm(P =0.223),the angle measurement accuracy was (-0.22 ±2.1 4)°and (0.1 2 ±2.69)°(P =0.428),respectively.Conclusion:The 3D data of ficial morphology obtained by the 2 scanners are not signifi-cantly different.