study of the internal anatomy of the mandibular incisor teeth

statement of problem: knowledge of internal anatomy of tooth plays an important role in a successful endodontics treatment. for a proper endodontic treatment, it is not only important to know the form of normal anatomy of tooth’s interior but one must also be acquainted with the possible diverse forms. purpose: a thorough understanding of the internal anatomy of human mandibular incisors (central and lateral). materials and methods: a total of 205 central and lateral mandibular incisors that had healthy roots were selected and put in 10% formalin solution. after cleaning the samples with the help of brushes and other devices, they were kept in 5% sodium hypochlorite solution. finally the roots were cleaned and the samples were prepared for next stages. three methods were used, coloring (fushin1%, radiography (buccolingual and proximal sides), and cross-sectioning (cervical- middle-apical). results: the result indicated that: - 88%of the teeth had a single canal and one apical foramen; - 8% of the teeth had a single canal and two apical foramena; - 3.5% of the teeth had two canals and one apical foramen; - 0.5% of the teeth had two canals and two apical foramena; conclusion:a thorough understanding of the pulp morphology is essential for successful treatment of root canal. therefore, a dentist should always be on the watch for the existence of two canals or a two-branched canal while working on the mandibular incisor teeth. it is essential to have the necessary precision in finding the second canal.