Does overlay preparation design affect polymerization shrinkage stress distribution? A 3D FEA study

Andrade, Guilherme Schmitt de; Pinto, Alana Barbosa Alves; Tribst, João Paulo Mendes; Chun, Eliseo Pablo; Borges, Alexandre Luiz Souto; Saavedra, Guilherme de Siqueira Ferreira Anzaloni

doi:10.1080/10255842.2020.1866561

Cited by 12 publications

(23 citation statements)

References 49 publications

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“…To date, few studies have evaluated the effect of the design of different full-coverage onlay preparations. Regarding the polymerization shrinkage stress, a study compared three types of preparations and concluded that less retentive preparations tend to reduce the polymerization shrinkage stress [38]. This same result was obtained in relation to fracture resistance.…”

Section: Introductionmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

“…To obtain the models for finite element analysis (FEA), all preparations were executed on a lower right first molar typodont (MOM, Marília, São Paulo, Brazil), according to the following recommendations: simplified non-retentive preparation (nRET)-occlusal reduction following the natural tooth morphology (2 mm on functional cups, 1.5 mm on non-functional cusp), no isthmus preparation, all angles and walls smoothed and rounded, U-shaped proximal box with smooth transition, and oblique bevel in the cavosurface angles [29,38]; traditional overlay with isthmus preparation (IST)-occlusal reduction following the natural tooth morphology (2 mm on functional cups, 1.5 mm on non-functional cusp), isthmus preparation of 2 × 2 mm, proximal box thickness of 1 mm, chamfer of 1 mm in the axial walls, and an overall preparation angle of 6-10 • toward the occlusal aspect [38,43]; and traditional onlay without isthmus preparation (wIST)-butt-joint preparation in the proximal box with 1 mm of thickness, interior walls diverging 6-10 • , occlusal anatomy reduction following fissure directions and the resulting proportion of the cusps (2 mm on functional cups, 1.5 mm on non-functional cusp), and chamfer preparation of 1 mm on the axial walls [28,38,42]. For the standardization of the preparation's extension, a silicone matrix was made and used to mark the limits of extracoronary preparations with a brush pen.…”

Section: Methodsmentioning

confidence: 99%

“…This step was repeated for each preparation design. The geometries were imported into a Computer Aided Engineering (CAE) software (ANSYS 19.2, ANSYS Inc., Houston, TX, USA) in ".step" format, and tetrahedral elements aration (wIST)-butt-joint preparation in the proximal box with 1 mm of thickness, interior walls diverging 6-10°, occlusal anatomy reduction following fissure directions and the resulting proportion of the cusps (2 mm on functional cups, 1.5 mm on non-functional cusp), and chamfer preparation of 1 mm on the axial walls [28,38,42]. For the standardization of the preparation's extension, a silicone matrix was made and used to mark the limits of extracoronary preparations with a brush pen.…”

Section: Methodsmentioning

confidence: 99%

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Mechanical Behavior of Different Restorative Materials and Onlay Preparation Designs in Endodontically Treated Molars

et al. 2021

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This study evaluated the effect of the combination of three different onlay preparation designs and two restorative materials on the stress distribution, using 3D-finite element analysis. Six models of first lower molars were created according to three preparation designs: non-retentive (nRET), traditional with occlusal isthmus reduction (IST), and traditional without occlusal isthmus reduction (wIST); and according to two restorative materials: lithium-disilicate (LD) and nanoceramic resin (NR). A 600 N axial load was applied at the central fossa. All solids were considered isotropic, homogeneous, and linearly elastic. A static linear analysis was performed, and the Maximum Principal Stress (MPS) criteria were used to evaluate the results and compare the stress in MPa on the restoration, cement layer, and tooth structure (enamel and dentin). A novel statistical approach was used for quantitative analysis of the finite element analysis results. On restoration and cement layer, nRET showed a more homogeneous stress distribution, while the highest stress peaks were calculated for LD onlays (restoration: 69–110; cement layer: 10.2–13.3). On the tooth structure, the material had more influence, with better results for LD (27–38). It can be concluded that nRET design showed the best mechanical behavior compared to IST and wIST, with LD being more advantageous for tooth structure and NR for the restoration and cement layer.

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Section: Introductionmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Mechanical Behavior of Different Restorative Materials and Onlay Preparation Designs in Endodontically Treated Molars

et al. 2021

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“…The properties of each material were loaded and the models were considered linear, isotropic and homogeneous. Polymerization shrinkage was simulated by thermal analogy [14]. The temperature was reduced by 1 • C, and the linear shrinkage value (post gel shrinkage) was simulated based on the coefficient of linear thermal expansion (Figure 2).…”

Section: Methodsmentioning

confidence: 99%

Computer Aided Design Modelling and Finite Element Analysis of Premolar Proximal Cavities Restored with Resin Composites

et al. 2021

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This study evaluated the stress distribution in five different class II cavities of premolar models restored with conventional or bulk-fill flowable composite by means of finite element analysis (FEA) under shrinkage and occlusal loading. An upper validated premolar model was imported in the software, and five class II cavities with different occlusal extensions and dimensions were prepared: horizontal cavity on the mesial surface (horizontal slot), mesio-occlusal cavity, mesial cavity (vertical slot), tunnel type cavity and direct access cavity. The models were restored with conventional or bulk-fill flowable resin composite. The tested materials were considered as homogeneous, linear, and isotropic. The Maximum Principal Stress criteria was chosen to evaluate the tensile stress results. The lowest shrinkage stress value was observed in the direct access cavity restored with bulk-fill flowable resin composite (36.12 MPa). The same cavity, restored with conventional composite showed a score of 36.14 MPa. The horizontal slot cavity with bulk-fill flowable showed a score of 46.71 MPa. The mesio-occlusal cavity with bulk-fill flowable had a score of 53.10 MPa, while with conventional composite this was 55.35 MPa. Higher shrinkage stress was found in the vertical slot cavity with conventional resin 56.14 MPa, followed by the same cavity with bulk-fill flowable 56.08 MPa. Results indicated that the use of bulk-fill flowable composite resin more significantly decreased the polymerization shrinkage stress magnitude. The larger the cavity and the volume of material necessary to restore the tooth, the greater the residual stress on enamel and dentin tissue.

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Impact of different complete coverage onlay preparation designs and the intraoral scanner on the accuracy of digital scans

Andrade

Luz

Tribst

et al. 2024

The Journal of Prosthetic Dentistry

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Does overlay preparation design affect polymerization shrinkage stress distribution? A 3D FEA study

Cited by 12 publications

References 49 publications

Mechanical Behavior of Different Restorative Materials and Onlay Preparation Designs in Endodontically Treated Molars

Mechanical Behavior of Different Restorative Materials and Onlay Preparation Designs in Endodontically Treated Molars

Computer Aided Design Modelling and Finite Element Analysis of Premolar Proximal Cavities Restored with Resin Composites

Impact of different complete coverage onlay preparation designs and the intraoral scanner on the accuracy of digital scans

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