Influence of the veneer-framework interface on the mechanical behavior of ceramic veneers: A nonlinear finite element analysis

Lazari, Priscilla Cardoso; Sotto-Maior, Bruno Salles; Rocha, Eduardo Passos; Camargos, Germana de Villa; Cury, Altair Antoninha Del Bel

doi:10.1016/j.prosdent.2014.01.022

Cited by 9 publications

(5 citation statements)

References 30 publications

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“…Finally, the statistical analysis would be able to improve the interpreting of the results (Lemos et al, 2016;Minatel et al, 2017;Pellizzer et al, 2018), showing quantitative analysis but, in the present study, the maps of stress and strain were very clear avoiding the bias in the interpretation. Thus, the statistical analysis was not applied as previous studies in FEA de Souza Batista et al, 2017 (2); Lazari et al, 2014;Toniollo et al, 2017;Lemos et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

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Different bone anchorages for Morse taper implants with different lengths in maxilla anterior: An in silico analysis

Oliveira

Lemos

Cruz

et al. 2021

RSD

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This study aimed to evaluate the stress distribution in bone tissue, in Morse tapper implants and components supporting a single crown in the maxillary anterior area, under different bone anchorages (conventional, bicortical and bicortical with nasal floor elevation) and implant lengths (8.5 mm, 10 mm and 11.5 mm) using 3D finite element analyses. Three 3D models including element #11 were simulated using software InVesalius, Rhinoceros 3D and SolidWorks. Bone block models were reconstructed from computed tomography and simulated the placement of one implant of 4 mm of diameter and lengths above mentioned, supporting cemented zirconia crown. The 3D models were processed by the finite element FEMAP and NeiNastran software, using a load of 178N were applied at 0º, 30º and 60º, considering the implant long axis. Results were visualized as the von Mises stress, maximum principal stress and microstrain maps. Bicortical bone anchorages showed lower stress and microstrain bone tissue when compared to conventional bone anchorage. However, no differences were observed between bicortical and nasal floor elevation. Regarding implants and components, the stress distribution was similar between models with little stress relief in the apical region of the implants for implants with conventional anchorage. The conclusion drawn from this study is that non-axial loading showed worse biomechanical behavior for bone tissue and implants/components. The bicortical techniques (bicortical and nasal floor elevation) should be preferred during the implant placement to reduce the stress and microstrain in the bone tissue.

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Section: Discussionmentioning

confidence: 99%

“…The dimensions of the prosthetic crown were simulated by a reduction of 1mm of thickness in the vestibular and palatal surfaces and 2.0mm in the incisal surface. In addition, the cement layer was simulated with 0.09 mm of average thickness, simulating resinous type (Lazari et al 2014).…”

Section: Methodsmentioning

confidence: 99%

Different bone anchorages for Morse taper implants with different lengths in maxilla anterior: An in silico analysis

Oliveira

Lemos

Cruz

et al. 2021

RSD

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“…All-ceramic systems are widely used to achieve excellent esthetic restorations. Especially for zirconia and alumina restorations, they need to be covered by feldspathic ceramic to decrease the opacity of the framework [24] .If the core/ceramic veneer interface exhibits an incomplete bond, chipping or fracture is expected to initiate in the veneer margins [25] . The literature reports that the interface between the ceramic veneer and the framework affects the mechanical performance of the ceramic veneer [24] , showing the importance of this interface in the integrity of the restorations.…”

Section: Discussionmentioning

confidence: 99%

Influence of the coefficient of thermal expansion on the stress distribution in ceramic veneers after thermal simulation

Carvalho¹,

Boaventura²,

Firmiano³

et al. 2020

IJAERS

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The aim of the study was to evaluate the stress distribution in the ceramic veneers in a full prosthetic crown with different framework after the sintering and cooling cycle through the thermal analysis by three-dimensional finite element analysis. Using images from a computerized microtomography of a central incisor, an anterior crown was constructed. The models were composed of 2mm thickness ceramics (feldspathic ceramics) and 0.4mm thickness frameworks (zirconia, alumina, lithium-disilicate, or metal). Ansys Workbench finite element software was used for analysis and mesh generation through a 5% convergence. The thermal loading was performed in 2 stages simulating the heating and cooling of the ceramic veneer sintering cycle: stage 1 -403 to 750 degrees C; stage 2 -from 750 to 25 degrees C. The von Mises equivalent strain(σvM) was used for the quantitative and qualitative evaluation of the framework. The maximum (σmax) and minimum (σmin) stresses were used to evaluate the ceramic veneer and zirconia, alumina, and lithium-disilicate frameworks. The highest values of compressive stress (294,58 MPa) were found in the ceramic veneer in the models with alumina framework, followed by models with zirconia (253,65 MPa), palladium silver (239,74 MPa), and lithium disilicate (205,43MPa). The tensile stresses followed the same behavior presenting the highest values in the alumina prostheses (Al: 93,977

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“…The element size was set at 0.2 mm, while the number of elements for the different structures ranged between 1951 and 193,232 (Table ). The final 3D FE model consisted of 322,865 tetrahedral elements in total, considerably higher than previous studies reporting on similar subjects . As cement layer has a thickness of 25 to 30 µm the optimal element size for that structure was determined to be 0.007 mm, thus creating a problematic interface with the veneer and the tooth structures due to the big difference in element size.…”

Section: Methodsmentioning

confidence: 99%

Influence of Preparation Depth and Design on Stress Distribution in Maxillary Central Incisors Restored with Ceramic Veneers: A 3D Finite Element Analysis

Tsouknidas

Karaoglani

Michailidis

et al. 2019

Journal of Prosthodontics

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Purpose: To evaluate the influence of different preparation designs and depths on the stress field developed in maxillary central incisors restored with veneers made with different ceramic materials using finite element analysis (FEA). Materials and Methods:A linear static three-dimensional finite element analysis model was used with the aid of reverse engineering to develop digital models of maxillary central incisors restored with ceramic veneers, according to two different preparation depths (thin vs deep) and two different preparation designs (feather edge vs butt joint). Three ceramic systems were tested: (i) feldspathic porcelain, (ii) heat pressed glass ceramic IPS Empress 2 (Ivoclar Vivadent AG), and (iii) heat pressed glass ceramic IPS e.max-Press (Ivoclar Vivadent AG). Each model was subjected to a compressive force of 200N applied to the palatal surface 2 mm below the incisal edge. The longitudinal axis of the restored tooth formed an angle of 130 o with the direction of the force. The biomechanical behavior of the different models was examined according to the von Mises stress criterion. Statistical analysis was performed using nonparametric confidence interval estimation using bootstrapping. Results: The maximum observed stress values were calculated and found to be similar between prepared and intact teeth. The cervical margin of the veneers displayed the highest von Mises stress values. Irrespectively of the depth and preparation design, the biggest von Mises stress values were observed at the veneer structures with the following order: (i) IPS Empress 2, (ii) IPS e.max-Press, (iii) feldspathic (p = 0.001). Preparation depth resulted in statistically significant differences (p = 0.001) in the stress distribution in the majority of tested structures. As the preparation depth was increased, the stresses within the veneer structure and the tooth structures were decreased. No statistically significant differences were detected in the stresses among the different restored models, when the preparation design was considered. Conclusions: This FEA study suggests that ceramic veneers could restore the biomechanical behavior of prepared central incisors and made it similar of that of an intact tooth. Regardless of the preparation depth and design and the ceramic system used, the cervical margin of ceramic veneers presents the highest von Mises stress values. When feldspathic porcelain was compared with lithium disilicate (IPS e.max Press), the latter displayed the lowest transfer of stresses to dental tissues. An increase in preparation depth resulted in a statistically significant stress decrease in both the veneer and the tooth.

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Influence of the veneer-framework interface on the mechanical behavior of ceramic veneers: A nonlinear finite element analysis

Cited by 9 publications

References 30 publications

Different bone anchorages for Morse taper implants with different lengths in maxilla anterior: An in silico analysis

Different bone anchorages for Morse taper implants with different lengths in maxilla anterior: An in silico analysis

Influence of the coefficient of thermal expansion on the stress distribution in ceramic veneers after thermal simulation

Influence of Preparation Depth and Design on Stress Distribution in Maxillary Central Incisors Restored with Ceramic Veneers: A 3D Finite Element Analysis

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