*3.1.2 Evaluation of food impaction around implants*

Food impaction is one of the most common risk factors for developing periimplant diseases [58]. Food impaction around implants can cause bleeding, edema, inflammation, halitosis, bone loss, pocket formation, implant mobility, and finally implant failure. The following is a classification for food impaction given by Chopra et al. [59] which will help us diagnose the cause for food impaction.

Class I: Food impaction present between either an implant supporting crown/ fixed dental prosthesis (FDP) and the adjacent natural tooth.

Class II: Food impaction present between either an implant supporting a single crown/FDP and a tooth with caries/faulty restoration/crown/FPD.

Class III: Food impaction present between two adjacent implants with either a single crown/FDP.

Class IV: Food impaction below the pontic of an implant with FDP.

Class V: Food impaction around implant-supported/retained dentures.

Class I–Class V has additional sub-categories based on the etiology of food lodgement [59].
