الفهرس 
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Abstract
The lips are a very important structure in the beauty of the face. People - especially those of the female sex - pay special attention to care of the lips as they are a key element for conveying expressions, emotions, and attractiveness (Saadeldeen, 2009). The upper and lower lips are the most important functional and aesthetic anatomical structures of the lower segment of the face. The lips contribute to chewing, speech,facial expressions, and oral competence. Due to these complex functions, the reconstruction of lip defects can pose a challenge to plastic surgeons that seek to achieve excellence in aesthetic and functional lip restoration The aim of this prospective inteventional study is to review our experience gained and the difficulties encountered in the reconstruction of various defects of the lip in patients admitted to Plastic, Reconstructive and Burn surgery center, Faculty of Medicine, Mansoura University, during the period from January 2019 to January 2020. These thirty patients were divided according to the cause of the lip defect into two groups: I. First group (G I): (congenital group ): this group include 9 patients, 4 males and 5 famales. Aged from 3 month to 50years old. Caused by cleft lip defect, 2 cases bilateral and 7 cases unilateral ,2 cases on rt side (complete and incomplete) and 5 cases on lt side (4 cases complete and 1 case incomplete).all cases were repaired by millard technique under general anathesia II. Second group (G II): (acquired group): This group included 21 patients with full-thickness lip defects. This group is subdivided into three subgroups (G IIa, G IIb and G IIc) according to site and siz of lip defect as follow: • (G IIa): include 7 patients with full thickness lip defects less than one third total lip length, and they were 1 female and 6 males, aged from (4- 50) years old. They were 4 cases with scar revision and 3 cases with contracture scar. 4 cases treated by primary repair of the remaining lip tissue and 3 cases treated by full thickness skin graft. 3 cases with local anathesia and 4 cases with general anathesia. • (G IIb): include 10 patients with full-thickness defects between one third and two thirds lip length, and they were 3 females and 7 males, aged from (2-50) years old. 3cases caused by electric burn in lower lip, 3 cases post SCC excision of lower lip, 2 cases post animal bite(one lower lip and one upper lip), and last two cases caused by RTA (one lower lip and one upper lip). They were treated by Cheek advancement flap (3 cases), Karapandzic flap, Bilateral advancement flap (3 cases), vermilion flap (one case) and Estlander flap (3 cases). All cases were generally anathetized. • (G IIc): include 4 patients, 3 with commissure defect and and one case with lower vermilion defect, aged from (36-60) years old. They all females. 3 cases cuased by microstomia and one case of milkerson syndrome,they were treated by mucousal flaps.3cases were locally anathetized and 1 case with general anathesia. he study included 30 patients. 16 patients in the age range (0-19), 12 of them were males and 4 were females. It included 4 patients in the age range (20-39), and they were all females. In the age range (40-59), there were 10 patients, 5 of them were females and 5 were males.