الفهرس 
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Abstract
Aim: This an in-vitro study was conducted to evaluate the fracture resistance of different post and core systems for restoring pulpectomized primary incisors.Methods: Forty extracted primary incisors were collected, prepared, and then obturated using Metapex. Teeth were then divided into four groups (N = 10/group). group 1: teeth restored with human dentin post & composite core; group 2: bovine dentin post & composite core; group 3: glass fiber posts & composite core; and group 4: orthodontic stainless steel wire in omega-form & composite core. Sound blocks of dentin were obtained from the roots of the extracted human and bovine teeth to fabricate the dentin posts. These blocks were milled by a special bur in the computer numerical control milling machine (CNC). The posts were cemented using glass ionomer cement (GIC), followed by crown build-up with composite resin. For all samples, thermocycling was performed, and then the fracture resistance and mode of failure were examined.Results: This results revealed no significant difference between the four experimental groups regarding maximum compressive load and modes of failure.Conclusion: The Glass fiber posts and omega posts had higher fracture resistance than the human and bovine dentin posts, although all groups exhibited fracture resistance greater than the maximum bite force in children, indicating that they can be successfully utilized to restore severely damaged primary incisors.