Table 1: Etiology of coronal sinus discharge in a submerged implant.

No.	Causes
1- 2- 3- 4- 5-	Overheating of the drill during osteotomy Soft tissue entrapment during cover screw placement Contamination during implant placement surgery Foreign body lifted at the site of the implant Implant placed at the site of a previously infected tooth (periapical or periodontal)