الفهرس 
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Abstract
Maintenance of the integority and function of the primary dentition until physiological exfoliation constitutes the main objective of pediatric dentistry.Endodontic treatment may be necessary in cases of traumatic or extensive carious lesions. In such treatments may be necessary in cases length should be accurately determined to minimize periapical injury and possible damage to the permanent successor>Thus, root canal lengthy determination is a crucial factor for a successful treatment,because of the need to complete disinfection without harming the periapical tissues.