title: Constricted canals: a new strategy to overcome this challenge.
abstract: Negotiation of constricted canals can be a challenge during endodontic treatment. Over the years, several strategies have been presented in order to overcome the difficulties imposed by this anatomical feature. This paper presents three cases using a different protocol from that recommended by the manufacturer of the Protaper System in order to facilitate the negotiation of constricted canals. These cases suggest that the modified protocol shown is able to perform the shaping process with less resistance, reducing the risk of instrument separation and performing an effective process to reach the apical thirds in constricted canals.
authors.affiliation: Ribeirão Preto Dental School, University of São Paulo, 05508-070 Ribeirão Preto, SP, Brazil.
authors.forename: Ricardo
authors.identifier: 0000-0002-1901-7270
authors.initials: R
authors.lastname: Machado
authors.affiliation: Grande Rio University, 25071-202 Rio de Janeiro, RJ, Brazil.
authors.forename: Emmanuel João Nogueira Leal
authors.initials: EJ
authors.lastname: Silva
authors.affiliation: Ribeirão Preto Dental School, University of São Paulo, 05508-070 Ribeirão Preto, SP, Brazil.
authors.forename: Luiz Pascoal
authors.initials: LP
authors.lastname: Vansan