title: Shaping ability of reciproc and TF adaptive systems in severely curved canals of rapid microCT-based prototyping molar replicas.
abstract: OBJECTIVE
  To evaluate the shaping ability of Reciproc and Twisted-File Adaptive systems in rapid prototyping replicas.
  
  
  METHODS
  Two mandibular molars showing S-shaped and 62-degree curvatures in the mesial root were scanned by using a microcomputed tomography (μCT) system. The data were exported in the stereolitograhic format and 20 samples of each molar were printed at 16 µm resolution. The mesial canals of 10 replicas of each specimen were prepared with each system. Transportation was measured by overlapping radiographs taken before and after preparation and resin thickness after instrumentation was measured by μCT.
  
  
  RESULTS
  Both systems maintained the original shape of the apical third in both anatomies (P>0.05). Overall, considering the resin thickness in the 62-degree replicas, no statistical difference was found between the systems (P>0.05). In the S-shaped curvature replica, Reciproc significantly decreased the thickness of the resin walls in comparison with TF Adaptive.
  
  
  CONCLUSIONS
  The evaluated systems were able to maintain the original shape at the apical third of severely curved mesial canals of molar replicas.
authors.affiliation: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Ronald
authors.initials: R
authors.lastname: Ordinola-Zapata
authors.affiliation: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Clovis Monteiro
authors.initials: CM
authors.lastname: Bramante
authors.affiliation: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Marco Antonio Húngaro
authors.initials: MA
authors.lastname: Duarte
authors.affiliation: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Bruno Cavalini
authors.initials: BC
authors.lastname: Cavenago
authors.affiliation: Department of Endodontics, Loma Linda School of Dentistry, University of Loma Linda, Loma Linda, United States.
authors.forename: David
authors.initials: D
authors.lastname: Jaramillo
authors.affiliation: Department of Endodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Marco Aurélio
authors.initials: MA
authors.lastname: Versiani
mesh_terms: D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D006801:Humans; D021621:Imaging, Three-Dimensional; D008953:Models, Anatomic; D008963:Molar / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D012015:Reference Standards; D015203:Reproducibility of Results; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D018709:Statistics, Nonparametric; D019227:Tooth Apex / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D055114:X-Ray Microtomography / Q000379:methods*