PMID- 32128525 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Quintessence Int JT - Quintessence International IS - 1936-7163 (Electronic) IP - 4 VI - 51 PST - ppublish DP - 2020 PG - 268-273 LA - en TI - Flexural strength of minimum thickness ceramic veneers manufactured with different techniques LID - 10.3290/j.qi.a44147 [doi] FAU - Rizzante, Fabio A. P. AU - Rizzante F FAU - Soares-Rusu, Idiane B. L. AU - Soares-Rusu I FAU - Senna, Suellen S. AU - Senna S FAU - Ramos-Tonello, Carla M. AU - Ramos-Tonello C FAU - Mondelli, Rafael F. L. AU - Mondelli R FAU - Ishikiriama, Sérgio K. AU - Ishikiriama S FAU - Borges, Ana Flávia S. AU - Borges A FAU - Gutmacher, Zvi AU - Gutmacher Z CN - OT - CAD/CAM OT - ceramics OT - dental materials OT - esthetics OT - operative dentistry OT - prosthodontics OT - veneers AB - Objective: The objective of the present study was to assess the effect of monolithic and bilayer restorations considering heat-pressed and milled/CAD/CAM reinforced lithium disilicate ceramic veneers, on the flexural strength after cementation. Method and materials: Thirty-five specimens were divided into five groups (n = 7), according to the restorative solution: 2-mm thickness composite resin (CR2); heat-pressed monolithic ceramic 0.6 mm (HPM), CAD/CAM monolithic ceramics 0.6 mm (CCM); heat-pressed monolithic ceramic 0.4 mm + 0.2 mm glass-ceramic (HPB); CAD/CAM monolithic ceramic 0.4 mm + 0.2 glass-ceramic (CCB). Specimens were cemented on composite resin bars and submitted to a three-point bending test on a Universal Testing Machine, until fracture. Fractured samples were analyzed under stereomicroscope and SEM. Flexural strength data were analyzed by one-way ANOVA and Tukey test. Results: The control group showed the highest flexural strength results (119.57 ± 19.49 MPa), with values similar to groups HPM (98 ± 25.62 MPa) and CCM (96.14 ± 20.60 MPa). Groups HPB and CCB showed lower values when compared with the other groups. Fracture started from the base on monolithic groups and from ceramic on bilayer groups. Conclusion: Both ceramic systems (CAD/CAM and heat-pressed) have similar fracture strength, although bilayer restorations present lower strength when compared with monolithic ceramics. AID - 841295