title: Mechanical properties of composite resin blocks for CAD/CAM.
abstract: This study compared commercial composite resin blocks with one ceramic block for use in computer-aided design/computer aided manufacturing (CAD/CAM). Four composite resins, one composite ceramic, and one feldspar-ceramic block were investigated. Flexural strength (FS), flexural modulus (FM), and Vickers hardness (VH) were determined under three conditions: dry storage; immersion in water at 37°C for 7 days; and immersion in water at 37°C for 7 days followed by 10,000 thermocycles. After dry storage, FS ranged from 127 to 242 MPa, FM from 9.6 to 51.5 GPa, and VH from 64 to 455. Two-way ANOVA was performed for FS, FM and VH followed by Tukey's multiple comparison (α<0.05). Results demonstrated that the materials degraded after water immersion and thermocycling, but their properties were within the acceptable range for fabrication of single restorations according to the ISO standard for ceramics (ISO 6872:2008).
authors.affiliation: Oral Biomaterials Engineering, Department of Oral Materials Sciences and Technology, Course for Oral Health Engineering, School of Oral Health Care Sciences, Faculty of Dentistry, Tokyo Medical and Dental University.
authors.forename: Sasipin
authors.initials: S
authors.lastname: Lauvahutanon
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Maho
authors.initials: M
authors.lastname: Shiozawa
authors.forename: Naohiko
authors.initials: N
authors.lastname: Iwasaki
authors.forename: Yuya
authors.initials: Y
authors.lastname: Asakawa
authors.forename: Meiko
authors.initials: M
authors.lastname: Oki
authors.forename: Werner J
authors.initials: WJ
authors.lastname: Finger
authors.forename: Mansuang
authors.initials: M
authors.lastname: Arksornnukit
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D017076:Computer-Aided Design; D006245:Hardness Tests
chemical_list: D003188:Composite Resins