<prompt> In 20 to 50 of cases, the COC is associated with an unerupted or impacted tooth. The tooth most commonly being:IncisorCaninePremolarMolar  <response>: In 20 to 50 of cases, Calcifying Odontogenic Cyst COC is associated with a tooth most commonly a cuspid and impedes its eruption. Displacement of teeth and resorption of roots may occur. Perforation of the cortical plate may be seen radiographically with enlarging lesions.Reference: White and Pharoahs Oral Radiology Principles and Interpretation 7th edition page no 349 