[Objectives]This study is to investigate the difference in the comprehensive effects of the two types of machine-used nickel-titanium(ni-ti)instruments in removing root canal filling materials to provide guidance for ...[Objectives]This study is to investigate the difference in the comprehensive effects of the two types of machine-used nickel-titanium(ni-ti)instruments in removing root canal filling materials to provide guidance for clinical applications.[Methods]We selected 60 single-tube premolars and randomly divided them into a P group(ProTaper ni-ti file group)and a K group(K3 ni-ti file group).The root canal was prepared according to the uniform standard crown cutting and manual k-file stepwise regression method.The root canal was fully filled and the X-ray film was taken.X-rays were taken again after re-treatment.The removal rate of the root filler material was obtained using Auto CAD 2000 image analysis software.[Results]We found no statistical difference in the clearance and total time of the two nickel-titanium devices in removing the gum filling material.Both the ProTaper ni-ti file and the K3 ni-ti file were able to remove most of the root canal filling during root canal retreatment.[Conclusions]There was no significant difference between the two devices in clinical applications.展开更多
Dear Editor,Liposarcoma is a common soft tissue malignancy in adults.It most commonly occurs in the deep soft tis-sue of the extremities and retroperitoneum.Primary intrathoracic liposarcoma is rare,represents 2.7%of ...Dear Editor,Liposarcoma is a common soft tissue malignancy in adults.It most commonly occurs in the deep soft tis-sue of the extremities and retroperitoneum.Primary intrathoracic liposarcoma is rare,represents 2.7%of all liposarcomas[1].According to the distinct tumor loca-tions,it can be divided into mediastinal,pleural,and pulmonary liposarcomas.Most literature has reviewed the clinicopathological or molecular cytogenetic char-acteristics of mediastinal and thoracic liposarcomas[2,3].However,intrathoracic liposarcoma is poorly docu-mented because of its rarity.Complete surgical resection is thought to be the best treatment for primary intratho-racic liposarcoma,but the impact of radiotherapy and systemic therapy remains unclear.Therefore,we ana-lyzed the clinicopathological data of 31 patients with primary intrathoracic liposarcoma who were treated in the Cancer Hospital of Chinese Academy of Medical Sci-ences between October 1970 and July 2015 to explore their clinicopathologic features and treatment outcomes(Additional file 1:Table S1).展开更多
文摘[Objectives]This study is to investigate the difference in the comprehensive effects of the two types of machine-used nickel-titanium(ni-ti)instruments in removing root canal filling materials to provide guidance for clinical applications.[Methods]We selected 60 single-tube premolars and randomly divided them into a P group(ProTaper ni-ti file group)and a K group(K3 ni-ti file group).The root canal was prepared according to the uniform standard crown cutting and manual k-file stepwise regression method.The root canal was fully filled and the X-ray film was taken.X-rays were taken again after re-treatment.The removal rate of the root filler material was obtained using Auto CAD 2000 image analysis software.[Results]We found no statistical difference in the clearance and total time of the two nickel-titanium devices in removing the gum filling material.Both the ProTaper ni-ti file and the K3 ni-ti file were able to remove most of the root canal filling during root canal retreatment.[Conclusions]There was no significant difference between the two devices in clinical applications.
文摘Dear Editor,Liposarcoma is a common soft tissue malignancy in adults.It most commonly occurs in the deep soft tis-sue of the extremities and retroperitoneum.Primary intrathoracic liposarcoma is rare,represents 2.7%of all liposarcomas[1].According to the distinct tumor loca-tions,it can be divided into mediastinal,pleural,and pulmonary liposarcomas.Most literature has reviewed the clinicopathological or molecular cytogenetic char-acteristics of mediastinal and thoracic liposarcomas[2,3].However,intrathoracic liposarcoma is poorly docu-mented because of its rarity.Complete surgical resection is thought to be the best treatment for primary intratho-racic liposarcoma,but the impact of radiotherapy and systemic therapy remains unclear.Therefore,we ana-lyzed the clinicopathological data of 31 patients with primary intrathoracic liposarcoma who were treated in the Cancer Hospital of Chinese Academy of Medical Sci-ences between October 1970 and July 2015 to explore their clinicopathologic features and treatment outcomes(Additional file 1:Table S1).
