Abstract
(1) Background: to propose a new approach for crown veneers, with the use of an aesthetic porcelain coating, only in part of the zirconia infrastructure, and to analyze its biomechanical behavior to minimize chipping failures. (2) Methods: a maxillary molar was modeled using CAD software, preparing for traditional crowns and veneer crowns with various lengths. Five groups were formed: M—control group (monolithic crown of ultra-translucent zirconia); B—conventional (bilayer crown of ultra-translucent zirconia and ceramic covering); V—veneer (ultra-translucent zirconia crown with reduction only in the buccal and application of covering ceramics); V1—ultra-translucent zirconia crown with buccal reduction and 1 mm occlusal extension for covering ceramic application); V1.5—ultra-translucent zirconia crown with buccal reduction and 1.5 mm occlusal extension for application of covering ceramics. A load of 600 N was performed axially to a fossa bottom to simulate parafunction, and 300 N to the cusp tip to obtain the maximum principal stress results. (3) Results: group B showed a higher stress concentration in the occlusal region of the restorations, while the other groups absorbed the stress and dissipated it throughout the crown, presenting a higher stress concentration in the interface region with the tooth. (4) Conclusion: the highly translucent zirconia ceramic only associated with buccal covering ceramic could add aesthetic gain and rigidity to the system and could be a good option to restore maxillary molars in patients who do not have parafunction.
Highlights
There is a close relationship amongst the effectiveness of facial muscles, occlusion, and mouth opening, when evaluating the masticatory loads in the natural dentition during chewing [1]
Control group (M: monolithic crown of ultra-translucent zirconia); conventional (B: bilayer crown of ultra-translucent zirconia and ceramic covering); veneer (V: ultra-translucent zirconia crown with reduction of 1.5 mm only in the buccal and application of covering ceramics); veneer 1 (V1: ultra-translucent zirconia crown with buccal reduction and 1 mm occlusal extension for covering ceramic application); Veneer
The present study aimed to propose new applicability for the concept of crown veneers through ceramic materials currently available on the market, and to analyze the biomechanical behavior of these models
Summary
There is a close relationship amongst the effectiveness of facial muscles, occlusion, and mouth opening, when evaluating the masticatory loads in the natural dentition during chewing [1]. With the development of metal-free restorations, the demand for aesthetic and resistant materials has increased [3,4,5]. Some flaws (delamination, chipping, catastrophic fracture) are still found, despite the diversity of indirect restorative materials currently available on the market. This is because “aesthetics” and “resistance” are antagonistic, meaning that the more components that are associated with providing resistance to the material, the less aesthetics are achieved [6]. One practical example is zirconia ceramic, which has the highest biaxial flexural strength (800–1200 MPa) [6,7,8] in relation
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