<prompt> Most common type of cyst in jawRadicularDentigerous cystSolitary bone cystNasolabial cyst  <response>: Radicular Radicular Cyst 1. Also known as dental cyst or periodontal cyst or periapical granulomaQ 2 Most common cyst of jaw 3 It usually develops due to continuous irritation of infected tooth which stimulate the nests of cell to proliferate. 4 Occur more frequently in upper jaw. Presentation Cyst present at the apexQ of the affected tooth Expansion of jaw Painless unless infected Bone in thinned out with eggshell crackling. X- ray- well circumscribed radiolucency at the apex of the affected tooth. The margin of the cyst may be sclerosed. Treatment- Extraction of the carious tooth with curettage intra oral approach 