Whitepost is a fiberglass post. Whitepost is a post made of fiberglass composite and high - strength epoxy resin that acts as intraradicular reinforcement of the dental structure and promotes retention for the definitive restorative or core build - up material, in the case of indirect restorations. It is available in the DC and DC - E versions. With the same apical diameter corresponding to the DC version, Whitepost DC - E (Special) is different because it is thicker in the cervical region. It offers more strength in cases with a lower amount of remaining coronary portion or for teeth with wider canals.