title: Evaluation of regional bond strength of resin cement to endodontic surfaces.
abstract: The purpose of this study was to test the feasibility of adapting a new microtensile testing technique to measure resin cement bond strengths to the cervical, middle, and apical thirds of root canals. Post spaces were created in extracted human teeth, and the roots were ground flat on one side to expose the canal and permit ideal placement of one of two resin cements (Panavia 21 or C&B Metabond). After 48 h of storage, serial 1-mm-thick cross-sections were cut to create 6-10 specimens per root. The first three specimens were from the cervical third, the next three were from the middle third, and the last three were from the apical third of the root. Each 1 x 1 x 8 mm specimen was pulled to failure in a miniature testing machine. The results indicated that both resin cements produced high bond strengths (12-23 MPa), and that bond strengths to the apical third were significantly higher (p < 0.05) than to the cervical or middle third with either cement. This new method shows promise for evaluating resin bond strengths within root canals.
authors.affiliation: U.S Army Endodontic Residency, USA DENTAC, Fort Gordon, GA, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Gaston
authors.forename: L A
authors.initials: LA
authors.lastname: West
authors.forename: F R
authors.initials: FR
authors.lastname: Liewehr
authors.forename: C
authors.initials: C
authors.lastname: Fernandes
authors.forename: D H
authors.initials: DH
authors.lastname: Pashley
mesh_terms: D000268:Adhesiveness; D000704:Analysis of Variance; D001896:Boron Compounds; D001840:Dental Bonding; D003786:Dental Pulp Cavity; D003804:Dentin; D017220:Dentin-Bonding Agents; D005240:Feasibility Studies; D006801:Humans; D008422:Materials Testing / Q000379:methods; D008689:Methacrylates; D008768:Methylmethacrylates; D010710:Phosphates; D011176:Post and Core Technique; D019279:Resin Cements; D012387:Root Canal Filling Materials; D018709:Statistics, Nonparametric; D013718:Tensile Strength
chemical_list: D001896:Boron Compounds; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; D012387:Root Canal Filling Materials; C049495:Super-bond