Finite Element Stress Analysis of Diastema Closure with Ceramic Laminate Veneers

Chander, N Gopi; Padmanabhan, T. V.

doi:10.1111/j.1532-849x.2009.00490.x

Cited by 12 publications

(12 citation statements)

References 40 publications

(71 reference statements)

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“…This result is in agreement with that of other authors. [12,13,14] On the other hand, the results of this study are incompatible with that of other studies, [30,31] in which the traditional inter proximal preparation design without involvement of contact area exhibited better fracture resistance than in proximal preparation with contact involvement attributing their results by that, the stress levels increase on the incisal edge with an increase in extension of the interproximal preparation (it should be noted that, they used porcelain material rather than IPS e max press that has been used in this study).…”

Section: Discussioncontrasting

confidence: 99%

“…The basic geometric configurations of the different laminate veneer designs and its dimensions in millimeters in addition to 30 µ thickness of bonding agent layer with 100 µ thickness of resin cement layer were introduced into the ANSYS software program to obtain the nine models "as seen in Table 1". Young's Modulus, and Poisson's ratio of the tooth components as well as the used materials" as seen in Table 2", [17,18,19] were introduced to the ANSYS software program which in turn calculated stresses under a load of 100 N at 60° (tearing) and 125°(protrusion) [20] to identify maximum Von Mises equivalent stresses (in X, Y, Z directions) =…”

Section: Methodsmentioning

confidence: 99%

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Stress Analysis of Ceramic Laminate Veneer for Diastema Closure with Different Extensions and Different Directions of Applied Load

Badawy¹,

Aziz²

2018

IJDSR

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To analyze stress distribution on the IPS e. max (lithium di silicate) laminate veneer used for diastema closure with different free median extensions and different extensions of proximal preparation using two directions of applied force. Statement of the problem: Closure of large median diastema by laminate veneer will increase stress intensity on the unsupported mesial extension. Materials and Methods: Finite element model of unprepared maxillary central incisor was made, by deletion method, the labial surface was reduced by 0.5 mm. and is taken up to the height of the incisal edge (feather design), then, the basic geometric configurations of different laminate veneer designs and its dimensions in millimeters were introduced into the ANSYS software program to obtain the different nine models from three proximal extensions (1, 1.5 and 2 mm) and three unsupported median extensions (0.5, 1 and 1.5 mm), then the stress distributions were evaluated by applying load of 100 N at two angulations(60° and 125°). Results: In case of 60° applied load the highest stress value was recorded in Model 3 (veneer with 1 mm labiopalatal extension with 1.5 free median extension, 30.95 Mpa) where The lowest stress value was recorded in Model 7 (veneer with 2 mm labiopalatal extension with 0.5 free median extension, 20.15 Mpa). Statistically, there was a significant difference between tested models (P at the level 0.05) except in cases of model 1, 4 and 7 which exhibited no statistical significant difference (P > 0.05). In case of 125° applied load the highest stress value was recorded in Model 3 (veneer with 1 mm labiopalatal extension with 1.5 free median extension, 53.61 Mpa) where The lowest stress value was recorded in Model 7 (veneer with 2 mm labiopalatal extension with 0.5 free median extension, 39.27 Mpa). Statistically, there was a significant difference between tested models (P at the level 0.05) except in cases of model 4, 5 and 8 which exhibited no statistical significant difference (P > 0.05). Conclusion: Stress is concentrated on the free median extension, incisal edge, and the mesio-labioincisal point angle. The stress intensity increase in the following cases:-(1) increase in free median extension of the veneer, (2) increase in angulation of applied force, (3) decrease in proximal extension of laminate veneer.

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Section: Discussioncontrasting

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Stress Analysis of Ceramic Laminate Veneer for Diastema Closure with Different Extensions and Different Directions of Applied Load

Badawy¹,

Aziz²

2018

IJDSR

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“…Regarding the load cases, when conducting a FEA study, the simulated occlusal forces with oblique angles should be considered rather than the forces with vertical angles. Previous studies demonstrated that oblique loading forces generated more stress when compared to vertical loading forces . The results of this study confirmed the significant effect of eccentric lateral force angles to generate high tensile stress in the FDPs.…”

Section: Discussionsupporting

confidence: 87%

Evaluation of Stress Distribution in Tooth‐Supported Fixed Dental Prostheses Made of Translucent Zirconia with Variations in Framework Designs: A Three‐Dimensional Finite Element Analysis

Bakitian

Papia

Larsson

et al. 2020

Journal of Prosthodontics

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Purpose:To evaluate the influence of the framework designs on the stress distribution within tooth-supported partially veneered fixed dental prostheses (FDPs) made of translucent zirconia under simulated loads using a three-dimensional finite element analysis (3D-FEA). Material and Methods: For a linear 3D-FEA, simplified 3D solid models of prepared abutment teeth (first premolar and first molar) with different 3-unit FDPs were created. The models with different FDP designs-monolithic zirconia (control); semimonolithic zirconia with 0.3 mm veneer thickness (SM0.3); semi-monolithic zirconia with 0.5 mm veneer thickness (SM0.5); semi-monolithic zirconia with 0.5 mm veneer thickness supported with cap design (SMC), and semi-monolithic zirconia with 0.5 mm veneer thickness supported with wave design (SMW)-were analyzed using 3D-FEA. The elastic properties of the components (bone, dentine, cement, translucent zirconia, and veneering porcelain) were obtained from the published data for FEA. Simulated static loading forces (300 N) were applied at 10°oblique direction over six points in the occlusal surfaces of the FDPs. Maximum principal stress, shear stress, and safety factor were calculated and analyzed among the different models. Results: Semi-monolithic with cap design showed the smallest maximum principal stress levels in the veneering porcelain compared to all other models (SM0.3, SM0.5, SMW). The SM0.3 had lower maximum principal stress levels in the veneering porcelain compared to SM0.5. Regarding stresses in the zirconia framework, all models had comparable results in maximum principal tensile stresses, except SMW had a lower value. Maximum principal stress levels were located in the veneer component of SM0.3, SM0.5, and SMW, whereas, such levels were observed in the cervical areas of the zirconia frameworks of SMC and control. The SM0.3 had the highest maximum shear stress levels at the zirconia-veneer interface, while SMW had the lowest shear values. The 3D-FEA models with different FDP designs showed different minimum safety factor levels. Conclusions: Framework and veneer designs play a significant role in the stress distribution of the partially veneered zirconia FDPs under loading. The FDPs with zirconia frameworks with cap design minimize the maximum principal tensile stress in the veneering porcelain. The FDPs with 0.3-mm-veneering porcelain show low maximum principal tensile stress in the veneering porcelain, but highest maximum shear stress at the zirconia-veneer interface. The FDPs with wave design of zirconia frameworks minimize the maximum shear stress considerably.

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“…However, Hojjatie and Anusavice analyzed the influence of the pulp chamber and found that the absence or presence of this region within the FEM had a negligible influence on the stress distribution and magnitude in their tested glass‐ceramic crowns and dentin . Chander and Padmanabhan stated that stress distribution is not affected significantly by the simulation of a pulp chamber . Both studies accounted for the negligibly small Young's modulus of the pulp chamber.…”

Section: Discussionmentioning

confidence: 99%

Effects of Differing Thickness and Mechanical Properties of Cement on the Stress Levels and Distributions in a Three‐Unit Zirconia Fixed Prosthesis by FEA

Wimmer

Erdelt

Raith

et al. 2014

Journal of Prosthodontics

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Finite Element Stress Analysis of Diastema Closure with Ceramic Laminate Veneers

Abstract: The extensions of PLV in diastema closure have more of an esthetic than functional consideration, but critical factors such as angulations and the loading level acting on the free extension of PLV are important.

Cited by 12 publications

References 40 publications

Stress Analysis of Ceramic Laminate Veneer for Diastema Closure with Different Extensions and Different Directions of Applied Load

Stress Analysis of Ceramic Laminate Veneer for Diastema Closure with Different Extensions and Different Directions of Applied Load

Evaluation of Stress Distribution in Tooth‐Supported Fixed Dental Prostheses Made of Translucent Zirconia with Variations in Framework Designs: A Three‐Dimensional Finite Element Analysis

Effects of Differing Thickness and Mechanical Properties of Cement on the Stress Levels and Distributions in a Three‐Unit Zirconia Fixed Prosthesis by FEA

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