Marginal fit and fracture resistance of advanced lithium disilicate occlusal veneer with different preparation designs

Hashem, Raiesa

doi:10.21608/edj.2023.204093.2507

Cited by 3 publications

(1 citation statement)

References 30 publications

(37 reference statements)

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“…Another factor of utmost importance in the success of a restoration is dependent on the marginal adaptation of any performed restoration [ 17 ]. Moreover, different marginal preparation designs can affect the mechanical properties and marginal adaptation of occlusal veneers [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Marginal adaptation and fracture resistance of virgilite-based occlusal veneers with varying thickness

Rizk,

El-Guindy,

Abdou

et al. 2024

BMC Oral Health

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Statement of problem CAD/CAM occlusal veneers have been developed for minimally invasive prosthetic restoration of eroded teeth. Marginal adaptation and fracture resistance are crucial for the long-term survivability and clinical success of such restorations. Virgilite-based lithium disilicate glass-ceramic is a newly introduced material with claims of high strength. However, constructing occlusal veneers from this material of varying thickness has not been investigated. Purpose The current study aimed to assess the impact of CAD/CAM occlusal veneer thickness and materials on marginal adaptation and fracture resistance. Materials and methods Thirty-two occlusal veneers were constructed and divided into two groups (n = 16) based on the CAD/CAM material into Brilliant Crios and CEREC Tessera. Each group was further subdivided into two subgroups (n = 8) according to the thickness: 0.6 and 0.9 mm. Occlusal veneers were bonded to epoxy resin dies. The marginal gap was evaluated before and after thermodynamic aging. Fracture resistance and failure mode were evaluated for the same samples after aging. Marginal adaptation was analyzed using the Mann-Whitney U test. Fracture resistance was analyzed using Weibull analysis (α = 0.05). Results The marginal gap was significantly increased following thermodynamic aging for tested groups (P < 0.001). CEREC Tessera showed a significantly higher marginal gap than Brilliant Crios before and after aging for both thicknesses (P < 0.05). CEREC Tessera recorded lower significant fracture load values compared to Brilliant Crios (P < 0.05). Conclusions Both CEREC Tessera and Brilliant Crios demonstrated clinically accepted marginal gap values. All groups showed fracture resistance values higher than the average masticatory forces in the premolar region except for 0.6 mm CEREC Tessera. Clinical implications Reinforced composite occlusal veneers demonstrated more favorable outcomes in terms of marginal gap and fracture resistance at both tested thicknesses compared to virgilite-based lithium disilicate glass-ceramic. Additionally, caution should be exercised during the construction of occlusal veneers from virgilite-based lithium disilicate glass-ceramic with reduced thickness.

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Section: Introductionmentioning

confidence: 99%

Marginal adaptation and fracture resistance of virgilite-based occlusal veneers with varying thickness

Rizk,

El-Guindy,

Abdou

et al. 2024

BMC Oral Health

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Assessment of different materials used for fabrication of fixed free fixed dental prostheses: finite element analysis

Galal,

ElHotieby,

Hamza

et al. 2024

Bull Natl Res Cent

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Background This research assessed three materials to be used in the fabrication of fixed free fixed dental prosthesis using finite element analysis. Total deformation, Von Mises stress maximum amounts and sites on both the bone, and the fixed dental prosthesis body were compared. Methods 3D finite element model was made for the tested fixed dental prosthesis and a contact scanner was used. A fixed free dental prosthesis was made restoring the maxillary first premolar, where second premolar with first molar were the supporting abutments that were scanned. Porcelain fused to metal, CEREC Tessera (Dentsply Sirona) and Poly-Ether-Ketone-Ketone were assessed as fixed free dental prosthesis materials. Cement thickness was adjusted to 40 microns. 100 N vertical load was applied to the central fossa of the pontic in the model. Results The deformations in this study were within the acceptable range except with the PEKK fixed free prosthesis. Tessera showed better results than the porcelain fused to metal as the more elastic modulus allows for absorption of energy from loading. Conclusions Purely used PEKK is not recommended for fixed free dental prosthesis. Low stiffness fixed dental prosthesis material helps in transferring low amount of load to the underneath tissues.

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Assessement of different materials used for fabrication of fixed free fixed dental prostheses. Finite element analysis

Galal,

Elhotieby,

Hamza

et al. 2024

Preprint

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Objectives this research assessed three materials to be used for fabrication of fixed free fixed dental prosthesis using finite element analysis, total deformation, Von Mises stress maximum amounts and sites on the bone, and the fixed dental prosthesis body were compared. Methods 3D finite element model was made for the tested fixed dental prosthesis and a contact scanner was used. A fixed free dental prosthesis restoring the maxillary first premolar where second premolar with first molar were the supporting abutments that were scanned. Porcelain fused to metal, CEREC Tessera (Dentsply Sirona) and Poly-Ether-Ketone-Ketone were assessed as fixed free dental prosthesis materials. Cement thickness was adjusted to 40 microns. 100 N vertical load was applied to the central fossa of the pontic in the model. Results The deformations in this study were within the acceptable range except with the PEKK fixed free prosthesis. Tessera was with better results than the porcelain fused to metal as the more elastic modulus allows for absorption of energy from loading. Conclusion Purely used PEKK is not recommended for fixed free dental prosthesis. Low stiffness fixed dental prosthesis material helps in transferring low amount of load to the underneath tissues.

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Marginal fit and fracture resistance of advanced lithium disilicate occlusal veneer with different preparation designs

Cited by 3 publications

References 30 publications

Marginal adaptation and fracture resistance of virgilite-based occlusal veneers with varying thickness

Marginal adaptation and fracture resistance of virgilite-based occlusal veneers with varying thickness

Assessment of different materials used for fabrication of fixed free fixed dental prostheses: finite element analysis

Assessement of different materials used for fabrication of fixed free fixed dental prostheses. Finite element analysis

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