A dental implant at least includes a neck portion (10), an implant segment (20) and a sheath fixing segment (30). A rear portion of the neck portion (10) is a distal segment (11) extending slightly outwardly, and a front portion of the neck portion (10) is a fixing segment (12). The implant segment (20) is formed on the front side of the fixing segment (12). A screw thread (21) is arranged on the outer annular surface of the implant segment (20). The cross section shape of the screw thread (21) is a trapezium. The outer diameter of the front end of the implant segment (20) is gradually reduced to form an acute end segment (22). Multiple chip removal engaging grooves (23) are arranged on the screw thread (21) of the acute end segment (22) of the implant segment (20). The shape of the chip removal engaging grooves (23) is oblique in one direction. The sheath fixing segment (30) is formed on the rear side of the distal segment (11). The outer annular wall of the sheath fixing segment (30) is recessed inwardly from the rear end so that multiple sheath fixing grooves (31) equally spaced apart are provided. The sheath fixing grooves (31) keep a space of at least 1.5 centimeters apart from the end edge of the rear end of the distal segment (11).Linvention porte sur un implant dentaire comprenant au moins une partie col (10), un segment dimplant (20) et un segment de fixation de gaine (30). Une partie arrière de la partie de col (10) est un segment distal (11) sétendant légèrement vers lextérieur, et une partie avant de la partie de col (10) est un segment de fixation (12). Le segment dimplant (20) est formé sur le côté avant du segment de fixation (12). Un filet de vis (21) est disposé sur la surface annulaire externe du segment dimplant (20). La forme en coupe transversale du filet de vis (21) est un trapèze. Le diamètre externe de lextrémité avant du segment dimplant (20) diminue progressivement pour former un segment dextrémité aiguë (22). De multiples rainures dengagem
