Title: Morphological studies on the root canals of mandibular second molars
Abstract:Objective To study the types of dental root and root canal of mandibular second molars so as to provide anatomical evidence for root canal therapy.Methods A total of 682 well-developed mandibular seco...Objective To study the types of dental root and root canal of mandibular second molars so as to provide anatomical evidence for root canal therapy.Methods A total of 682 well-developed mandibular second molars were examined after decalcifying and clearing technique.Results 55.13%(376/682) of the 682 mandibular second molars had two roots.C-shaped canal system was found in 97 teeth(14.22%).Among seven categories of canal systems in the other 585 teeth,type 1-1,type 2-1 and type 2-2 were found commonly,with the incidence being 85.64%(501/585) in mesial roots and 96.75%(566/585) in distal roots.Double-canal type or the mixed form was examined in 72.14%(422/585) of mesial roots and 18.29%(107/585) of distal roots.60.00%(351/585) of mesial roots had double canal orifices and 35.21%(206/585) had two apical foramens,while 15.73%(92/585) of distall roots had double canal orifices and 13.50%(79/585) had two apical foramens.The incidence rate of lateral canal,transverse anastanose and apical delta were 24.19%(165/682),22.14%(151/682) and 8.21%(56/682),respectively.The apical foramina located at the apex of 55.76%(416/746) mesial roots and 57.85%(383/662) distal roots.Conclusion The canal systems of mandibular second molars vary considerably in their anatomical configuration.Therefore,it is very important to comprehensively learn anatomic knowledge of root canal for the clinical outcomes of root canal therapy.Read More
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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