RESUMEN
Objective To investigate the difference of standard tangential field and multiple fileld radiotherapy in axillary lymph node after conserving surgery,to provide a reference for clinical treatment.Methods 20 cases of left breast cancer patients were selected,all patients underwent breast -conserving surgery,postoperative radiothera-py.All patients used standard radiotherapy wild tangent based and reverse -intensity modulated radiation therapy optimization.Armpit I,Ⅱ lymph nodes were used to calculate the extent of coverage of the original plan,target dose uniformity HI,dose conformal CI,dosimetric parameters were calculated.Results Under standard tangential field irradiation,I stand mean dose was (33.95 ±8.24)Gy,which was significantly higher than Ⅱ station (22.13 ± 6.67)Gy,and V50,V45,V40 were (22.45 ±6.32)%,(39.83 ±7.54)%,(49.65 ±8.31)%,which were higher than Ⅱ stand,I stand irradiation was significantly more,the differences were statistically significant (t =5.632,P =0.009;t =7.214,P =0.000;t =8.954,P =0.000;t =6.121,P =0.002).The whole breast irradiation armpit IMRT plan,19 patients (95.00%)reached 95% by volume APTV≥50Gy,coverage was better;but HI,CI were (1.11 ± 0.03),(1.36 ±0.07)respectively,which were significantly worse than the standard wild tangent,the differences were statistically significant (t =6.584,P =0.001;t =9.144,P =0.000).Under Hatano IMRT irradiation ipsilateral lung,heart suffered an average dose of (1 694.58 ±102.31)cGy,(645.54 ±74.44)cGy,which were significantly more than the standard tangential field irradiation,the differences were statistically significant (t =7.654,P =0.000;t =6.654,P =0.001).Conclusion Standard tangential field irradiation has poor coverage in Ⅱ axillary lymph node station,irradiation intensity modulated radiation has better coverage,but significantly increased the dose to normal tissues.
RESUMEN
OBJECTIVE:To investigate advantages and disadvantages of preexisting metal post,casting metal post,ceramic post,and fiber post for clinical application,and to evaluate mechanical function,esthetical performance,and biocompatibility of fiber post.METHODS:Articles were retrieved with the key words of "fiber post,post-core restoration,dental materials,cement material,binder" in both English and Chinese between January 1990 and October 2008.Inclusion criteria:Articles addressing clinical application of fiber post for repairing residual root and crown were included.Exclusion criteria:Duplicated studies or Meta analysis was excluded.A total of 24 articles were included to investigate mechanical function,biocompatibility,and stickiness and retention of fiber post.RESULTS:Traditionally,metal post was easily folded and corrosive; in addition,esthetical performance and biocompatibility were still dissolved.Intension,hardness,esthetical performance,corrosion proof,fatigue resistance,and biocompatibility of fiber post were superior to those of traditional metal post.Furthermore,fiber post was able to highly adhere to root canal dentin via resin splicing agent,which could prolong useful life of dental prosthetic restoration,reduce root folded onset,and benefit for dental storage and repairing.Light mass of fiber post was another advantage compared with metal post.If the repair was failure,fiber post was easily taken out and reused.The combination of fiber post and resin nucleus was beneficial for dental prosthetic restoration which was highly closed to original structure of natural teeth.CONCLUSION:Fiber post was characterized by suitable elastic modulus,great esthetical repairing effect,reliable stickiness,easy identification and removal,high achievement ratio of repairing,and convenient operation; therefore,fiber post was a new and ideal material for clinical application.
RESUMEN
Titanium is abundant, soft and widespread, moreover it costs lowly and contributes towards an excellent biocompatibility and causticity resistance. For the metal materials used for repairing human hard tissues, titanium is the most approach to the human hard tissues regarding elastic modulus. This result may relieve the mechanical inadaptability between metal implants and bone tissues. Compared to other alloys, titanium inlay or crown plays a role on the protection of dental pulp and the prevention of cold or hot stimulus. Titanium and titanium alloy are satisfactory with regrad to the physical, chemical and mechanical properties, especially the biocompatibility and elaboration. Those good characteristics lead to a wide application prospect of titaniun in the field of dental restoration. Titanium and titanium alloy have become a hot topic of the alloy study for the stomatology.
RESUMEN
An ECG information database system was established with 1297 ECG information records and clinical informations. The data and the analysis software in this database can be shared with the international physiological signal databases such as MIT-BIH Arrhythmia. The establishment of this database will facilitate the clinical interpretation, diagnosis and prediction of cardiovascular diseases, especially the cardiac sudden death (SCD).