title: Comparison of apical centring ability between incisal-shifted access and traditional lingual access for maxillary anterior teeth.
abstract: The aim of this study was to compare the apical centring ability of incisal-shifted access (ISA) with that of traditional lingual access (TLA). Fifteen three-dimensional printed resin models were prepared from the computed tomography data for a human maxillary central incisor and divided into ISA (n = 7), TLA (n = 7) and control (n = 1) groups. After access preparation, these models were shaped to the working length using K-files up to #40, followed by step-back procedures. An apical portion of the model was removed at 0.5 mm coronal to the working length. Microscopic images of each cutting surface were taken to measure the preparation area and the distance of transportation. TLA created a larger preparation area than ISA (P < 0.05). The distance of transportation (mean ± standard deviation) was 0.4 ± 0.1 mm for ISA and 0.7 ± 0.1 mm for TLA (P < 0.05). Access cavity preparation has a significant effect on apical centring ability. ISA is beneficial to maintaining apical configuration.
authors.affiliation: Department of Endodontics, School of Dentistry, West Virginia University, Morgantown, West Virginia, USA.|Division of Endodontology, Department of Conservative Dentistry, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Yahata
authors.affiliation: Division of Endodontology, Department of Conservative Dentistry, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Masuda
authors.affiliation: College of Dental Medicine, University of New England, Portland, Maine, USA.
authors.forename: Takashi
authors.initials: T
authors.lastname: Komabayashi
mesh_terms: D003731:Dental Caries / Q000628:therapy*; D003737:Dental Cavity Preparation / Q000379:methods*; D003786:Dental Pulp Cavity / Q000601:surgery; D006801:Humans; D007180:Incisor; D008437:Maxilla; D003765:Models, Dental
keywords: 3D printing; cone-beam computed tomography; dental pulp cavity; incisor; root canal preparation