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. 2025 Jul 1;37(4-6):27.
doi: 10.1007/s44445-025-00029-8.

Fracture resistance of chairside cad/cam advanced lithium disilicate maxillary canine veneers with different incisal edge designs

Silvia Rojas-Rueda  1 , Hidehiko Watanabe  2 , Salah Abuhammoud  3 , Carlos A Jurado  4   5 , Abdullah Alshehri  6 , Chin-Chuan Fu  7 , Daniel Vegh  8 , Khalid M Aldosary  9 , Hamad Algamaiah  10 , Abdulrahman Alshabib  11
Affiliations

Fracture resistance of chairside cad/cam advanced lithium disilicate maxillary canine veneers with different incisal edge designs

Silvia Rojas-Rueda et al. Saudi Dent J. .

Abstract

This study aimed to evaluate the fracture resistance of maxillary veneers with feather edge, butt-joint and palatal chamfer and traditional full coverage crowns fabricated out of chairside CAD/CAM advanced lithium disilicate and virgilite. Fifty-two restorations for maxillary right canine were fabricated (n = 13 per group) as follows: veneers with feather edge, veneers with butt-joint, veneers with palatal chamfer and full coverage crowns out of chairside CAD/CAM lithium disilicate and virgilite (Cerec Tessera). The restorations were bonded to 3D printed resin dies with resin cement (Variolink Esthetic LC). The cemented restorations were subjected to 10,000 thermocycles at 5 to 55 °C with a dwell time of 30 s. The specimens were loaded until fracture using a universal testing machine and the resistance was recorded in Newtons. Two-way ANOVA was used to assess the fracture resistance among veneers with different incisal edge designs and between veneers and crowns. Scanning electron microscope (SEM) images of the fractured specimens were taken and descriptive analysis was carried out. Full coverage crowns displayed higher fracture resistance (1496 ± 41 N) than any type of veneers. Veneers with palatal chamfer showed the highest value (842 ± 28 N) among veneers followed by butt joint veneers (661 ± 22 N). Feather edge veneers provided the lowest fracture resistance values (464 ± 23 N). The fracture resistance of CAD/CAM advanced lithium disilicate maxillary veneers are significantly influenced by the incisal edge design. Palatal chamfer veneers displayed higher fracture resistance than feather edge and butt joint veneers. Full coverage crowns offered higher fracture resistance than any type of veneer.

Keywords: Chairside CAD/CAM; Crowns; Flexural strength; Lithium disilicate; Veneers.

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Conflict of interest statement

Declarations. Ethics approval and consent to participate: Not applicable. Consent for publication: Not applicable. Competing interests: The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Schematic drawing of the restorations evaluated in this study. (A) Veneers with feather edge; (B) veneers with butt joint; (C) veneers with palatal chamfer; and (D) full coverage crowns
Fig. 2
Fig. 2
Scanning electron microscope (SEM) images of fractured (1A—D) veneers with feather edge, (2A-D) butt joint; (3A-D) palatal chamfer; and (4A-D) with 10 × and 25 × magnification. Straight arrows pointing cleaner cracks while curved arrows display irregular cracks
Fig. 3
Fig. 3
Workflow implemented in this study. (1) Design and (2) fabrication of the restorations, (3) artificial aging provided with 10,000 thermal cycles, (4) fracture testing and (5) SEM evaluation
See this image and copyright information in PMC

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