الفهرس 
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Abstract
Aim : Toassess the fracture resistance of the cementum-extended and conventional composite fillings with or without intracanal composite posts in severely damaged primary incisors. Methods :Sixty freshly extracted maxillary primary incisors were endodontically treated with metapex and divided into four groups. group I restored withwell fittedcelloid crownfilled withlight cured composite resinabove the incisal edge of each tooth specimen. group II was the same as group I but with intracanalflowablecomposite resin post.group III restored with, 1mm wider than each tooth specimen,celluloid crown filled with light cured composite resinand adapted above the incisal edge of each tooth specimen. group IVwas the same as group III, but with intracanalflowablecomposite resin post. After that, all composite crowns of the teeth specimen were finished and polished, and then the entire teeth specimen were stored in normal saline to avoid dehydration. The fracture resistance was measuredby instron testing machine. The specimens of the four groups were examined under stereomicroscope andscanning electronmicroscope to determine the location of fracture and the mode of failure. Result : There was a statistically significant differencebetween group I and group II, group I and group IV, and group III andgroup IV. Extension of composite resin restoration to cementumwith intracanalflowablecomposite resin post in group IV significantly improvesfracture resistance. Conclusion :Extension of composite resin restoration to cementum with intracanalflowablecomposite resin post in group IV significantly improvesfracture resistance.