Fracture strength of direct versus indirect laminates with and without fiber application at the cementation interfaceGresnigt, M. M. M. & Ozcan, M., Aug-2007, In : DENTAL MATERIALS. 23, 8, p. 927-933 7 p.
Research output: Contribution to journal › Article › Academic › peer-review
Objectives. This study compared the fracture strength of direct and indirect resin composite laminate veneers and evaluated the effect of a bidirectional E-glass woven fiber application at different locations at the cementation interface.
Methods. Standard preparations on canines (N = 50, 10 per group) were made using a depth cutting bur (0.7 mm depth) designed for laminate veneer restorations. Forty indirect laminates using a highly filled polymeric material (Estenia) and 10 direct laminates (Quadrant Anterior Shine) were prepared according to the manufacturer's instructions. Bidirectional E-glass woven-fiber sheet (0.06mm) (Everstick) was applied at different locations at the cementation interface. The control group received no fibers. The specimens were stored in water at 37 degrees C for 1 month prior to fracture testing performed in a universal testing machine where the load was applied from the incisal direction at 137 degrees (1 mm/min).
Results. No significant differences were found between the five groups (P > 0.01) (one-way ANOVA). While indirect laminate veneers showed mean fracture strength of 247 +/- 47N, direct laminate veneers revealed 239 104 N. The use of E-glass fibers at the cementation interface at different locations did not increase the fracture strength significantly (286-313 N) (P > 0.01). Failure analysis showed mainly cohesive fracture of the veneer restoration (20/50) and adhesive failure between the cementation interface and the laminate with fiber exposure (19/50) covering more than half of the restorations.
Significance. Direct and indirect resin composite laminate veneers showed comparable mean fracture strengths. The use of E-glass woven-fiber sheet at the cementation interface did not increase the fracture strength of the polymeric laminate veneers. (c) 2006 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
|Number of pages||7|
|Publication status||Published - Aug-2007|
- cementation, E-glass fibers, laminates, fiber-reinforcement, fracture strength, particulate filler composites, veneers, WOVEN GLASS-FIBERS, BOND STRENGTH, PORCELAIN VENEERS, ELASTIC BEHAVIOR, REINFORCED COMPOSITES, RESIN CEMENTS, RESTORATIONS, FAILURE, STRESS, DENTIN