Finite Element Analysis of Occlusal Veneer Restorations: Effect of Material Type and Bonded Substrate

Document Type : Original Article

Abstract

Objective: To evaluatestress distribution within and around  lithium disilicate, zirconia and hybrid ceramic occlusal veneers bonded to dentin, dentin with prepared cavity and dentin with composite filling.
Materials and Methods Nine fresh extracted individual mandibular first molar were distributed into three equal groups (n=3) according to bonded substrate ,where group I lithium disilicate (L): LD, LC and LF subgroups, group II zirconia (Z): ZD, ZC and ZF subgroups, group III hybrid ceramic (H): HD, HC and HF subgroups, a computer aided design/manufacturing system was used. A dual cure, adhesive resin cement was used to bond all occlusal veneers to corresponding prepared teeth. FEA was carried out as well to evaluate the distribution of stresses.
Results: Different occlusal veneers preparation designs showed minor  differences appeared by changing restoration materials in each model. Under vertical loading zirconia occlusal veneer showed the lowest deformation followed by lithium disilicateocclusal veneer and hybrid ceramics occlusal veneer showed the highest deformations. LF, ZF and HF subgroups and LD, ZD and HD subgroups occlusal veneer can be conservative and safe to use as a restoration to worn posterior teeth. Cement under zirconia restoration showed the lowest deformation followed by lithium disilicate and hybrid ceramics  showed the highest deformations. The dentin for the model of LF, ZF and HF subgroup showed the lowest stresses then the model of LD, ZD and HD subgroup and the highest values appeared on model of LC, ZC and HC subgroup < /strong>
Conclusions: Both models of the occlusal veneers displayed maximum stress within the safety factor when the designs were subjected to the standard biting force.
 

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Mansoura Journal of Dentistry
Volume 7, Issue 4
December 2020
Pages 59-63

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