title: Quantitative evaluation of debris extruded apically by using ProTaper Universal Tulsa rotary system in endodontic retreatment.
abstract: This study evaluated the amount of apical debris during endodontic retreatment by using the ProTaper Universal Tulsa rotary files. Forty-five extracted human anterior teeth were root filled before randomly assigned to 3 groups. In group A, gutta-percha was removed by using the ProTaper Universal Tulsa retreatment system, and canals were re-prepared with ProTaper rotary files. In group B, gutta-percha was removed by using Hedström files with chloroform, and canals were reshaped with ProTaper rotary files. In group C, the same method as that in group B was used for gutta-percha removal, and canals were reshaped with K-flex files. Apical debris was collected and compared among 3 groups. Although all retreatment techniques resulted in apical extrusion, the ProTaper Universal Tulsa rotary technique in group A produced significantly less amount of apical extrusion than other 2 methods (P < .001). The ProTaper Universal Tulsa rotary technique proves to be a viable alternative method in endodontic retreatment.
authors.affiliation: Department of Operative Dentistry and Endodontics, Guanghua College of Stomatology, Sun Yat-sen University, Guangzhou, China.
authors.forename: Xiangya
authors.initials: X
authors.lastname: Huang
authors.forename: Junqi
authors.initials: J
authors.lastname: Ling
authors.forename: Xi
authors.initials: X
authors.lastname: Wei
authors.forename: Lisha
authors.initials: L
authors.lastname: Gu
mesh_terms: D000704:Analysis of Variance; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging; D011859:Radiography; D019233:Retreatment / Q000295:instrumentation / Q000379:methods; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D012399:Rotation