Since the first successful establishment of human embryonic stem cell line in 1998,embryonic stem cell research has attracted much attention in recent years.Theoretically,embryonic stem cells are pluripotent 0f in vitro proliferation and in vivo differentiation.which could serve as a promising seed cell source for cell thera PY or tissue engineering.Differentiation of the embryonic stem cells into a certain type of cell still remains a big challenge.Studies regarding chondrogenic ifferentiation have been reported.This article summarizes the chon drogenic process in developing embryo and the currently known factors involved in the in vitro chondrogenic differentiation of embryonic stem cell.Foreground of the study in this field is discussed.

Objective To explore the effectiveness of modified Bardach two-flap palatoplasty combined modified Furlow double-opposing Z-plasty in wide palatal cleft repair.Methods 80 patients aged 2-18 years old with Ⅲ cleft palate from our department were divided into two groups,the experimental group (n=40) was repaired with modified Bardach two-flaps palatoplasty combined modified Furlow double-opposing Z-plasty (modified B+F technique).The control group (n =40) was repaired with Sommerlad levator muscle of palatine velum reconstruction (S technique).Results The healing of incisions was better in the experimental group than the control group.The fistula rate in the experimental group was 2.5％,which seemed to be remarkable lower than that of the control group (7.5％) post operation one month.Conclusions Application modified Bardach two-flaps palatoplasty combined modified Furlow double-opposing Z-plasty in wide palatal cleft will promote healing of incisions,reduce the occurrence rate of cleft palate fistuia,inhibit the scar contracture of soft palate,maintain the length of soft palate,augment movement of soft palate,and improve the speech quality of patients.

Objective:To investigate the hemostatic effect of epinephrine saline rinse solution in cleft palate repair.Methods:A total of 100 children who underwent cleft palate repair in the operating room of the Second Affiliated Hospital of Shantou University Medical College from 2018 to 2020 were selected, Among them, 51 were males and 49 females, aged from 6 months to 12 years, with an average (2.5±2.49) years. The patients were divided into two groups according to whether to use epinephrine saline flushing fluid: in group A, 43 cases were treated with adrenaline saline irrigation solution to wash the incision during the operation; gauze soaked in rinse solution was used to fill the oral cavity before endotracheal intubation and extubation after operation; in B group of 57 cases, no intraoperative rinses were used. The intraoperative blood loss and operation duration were compared between the two groups.Results:Intraoperative use in group A after adrenaline saline rinses showed that the intraoperative blood loss of children (16.23±4.88) ml was significantly lower than that of group B (19.26±4.13) ml. The duration of operation in group A (109.79±40.27) min was significantly shorter than that in group B (137.16±50.47) min, The difference was statistically significant ( t=2.92, P<0.05). Conclusions:The incision is rinsed with epinephrine saline solution during cleft palate repair. In addition, before endotracheal intubation and extubation after operation, gauze soaked in rinsing solution is used to fill the oral cavity, which could significantly reduce the amount of bleeding and shorten the operation time.