The impact of restorative material and ceramic thickness on CAD\CAM endocrowns

Tribst, João Paulo Mendes; Piva, Amanda Maria de Oliveira Dal; Madruga, Camila-Ferreira-Leite; Valera, Márcia Carneiro; Bresciani, Eduardo; Bottino, Marco Antônio; Melo, Renata Marques de

doi:10.4317/jced.56002

Cited by 20 publications

(30 citation statements)

References 51 publications

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“…However, the oblique incidence of chewing loads and cusp heights [ 9 ] also can affect the endocrown mechanical behavior and different occlusal anatomy can promote different results. However, for the molar region, the high incidence of axial loads in the posterior region makes the endocrown treatment a reliable modality considering the restoration fracture [ 12 , 14 ]. This study was also in agreement with this reported behavior, since the stress concentrations in the restoration cross-section and intaglio surface are not very different between the groups ( Figure 3 and Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have been carried out investigating the restorative material used to perform the endocrown treatment, reporting the use of ceramics, nanocomposites, and hybrid materials [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. In addition, clinical cases reported the use of acrylic resin [ 15 ], resin composite [ 16 ], and bis-acrylic resin [ 17 ] as restorative material for the manufacturing of interim endocrowns.…”

Section: Introductionmentioning

confidence: 99%

“…In order to understand the biomechanical behavior of endocrown restorations and the influence of restorative materials, a numerical simulation can be performed using the finite element method (FEM). This method has been extensively reported in literature, with previous studies that have evaluated this treatment modality [ 5 , 7 , 8 , 9 , 10 , 14 , 18 , 19 ]. As advantages, the FEM is able to identify problems by assessing the state of stress and deformation of materials and adhesive interfaces, evaluating the stress distribution generated by masticatory loads with model standardization, and offering an acceptable approximate solution [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Restorative Material on Mechanical Response of Provisional Endocrowns: A 3D—FEA Study

et al. 2021

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The goal of this study was to evaluate the stress distribution in an endocrown restoration according to different provisional restorative materials. An endodontically treated maxillary molar model was selected for conducting the finite element analysis (FEA), with a determined amount of dental remnant of 1.5 mm. The model was imported to the analysis software (ANSYS 19.2, ANSYS Inc., Houston, TX, USA) in STEP format. All contacts were considered perfectly bonded. The mechanical properties of each structure were considered isotropic, linear, elastic, and homogeneous. Three different provisional restorative materials were simulated (acrylic resin, bis-acrylic resin, and resin composite). An axial load (300 N) was applied at the occlusal surface in the center of the restoration. Results were determined by colorimetric stress maps of maximum principal stress, maximum shear stress, and total deformation. The different materials influenced the stress distribution for all structures; the higher the material’s elastic modulus, the lower the stress magnitude on the cement layer. In the present study, all provisional restorative materials showed similar stress patterns in the endocrown and on the cement layer however, with different magnitude. Based on this study limitation, the use of resin composite to manufacture provisional endocrowns is suggested as a promising material to reduce the stresses in the cement layer and in the dental tissue surfaces.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Restorative Material on Mechanical Response of Provisional Endocrowns: A 3D—FEA Study

et al. 2021

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“…Although maximum masticatory forces in mouth range between 597 N (women) and 847 N (men), in the molar region these forces can reach up to 900 N (Waltimo & Könönen, 1993). According to the literature, there are studies that have found the fracture strength of endocrowns to be much higher (Aktas et al, 2018; Gresnigt et al, 2016; Tribst et al, 2019). The fracture strength values in the present study are relatively lower than those in previous studies and this finding could be attributed to the differences in cavity preparation design, axis and point of applied force.…”

Section: Discussionmentioning

confidence: 99%

Marginal adaptation and fracture strength of endocrowns manufactured with different restorative materials: SEM and mechanical evaluation

Sağlam

Cengiz

Karacaer

2020

Microscopy Res & Technique

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Endocrowns were manufactured using different restorative materials to evaluate the marginal adaptation and fracture strength. Fifty endodontically treated mandibular first molar teeth were divided into five groups (n = 10). Endocrowns were obtained from lithium disilicate glass ceramic ingots by heat‐press technique (Group e.max Press: GEP), and from feldspathic blocks (Group Cerec: GC), polymer infiltrated ceramic network blocks (Group Enamic: GE), lithium disilicate glass ceramic blocks (Group e.max CAD: GEC), and zirconia‐reinforced glass ceramic blocks (Group Suprinity: GS) by CAD/CAM technique. After thermocycling, marginal adaptation was evaluated under scanning electron microscope at ×200 magnification. The specimens' fracture strengths were tested in universal test machine, and fracture types were evaluated. Statistical analyses were performed with Kruskal–Wallis test. The highest marginal gap value was found in GEP, but no significant differences were determined among the other four groups (p > .05). Significant differences were observed among the groups in terms of fracture strength (p = .019). The fracture strength values of GEC were significantly higher than GE, GC, and GS (p < .05). Values were not significantly different between the GEC and GEP groups (p > .05). CAD/CAM endocrowns showed better marginal adaptation than heat‐pressed endocrowns. Clinically acceptable marginal gaps were seen in both endocrown types. Both CAD/CAM and heat‐pressed lithium disilicate glass ceramic endocrowns showed higher fracture strength.

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“…Thus, this is regarded as a potential threat, knowing that remaining coronal tooth structure fractured. Lithium disilicate ceramic materials presented acceptable survival and fracture load as long as the material's minimum thickness and the enamel adhesion are respected [32]. In the 4 mm endocrown, the cement layer is far away from the load point, which is a protection.…”

Section: Discussionmentioning

confidence: 99%

Effect of different restorative crown design and materials on stress distribution in endodontically treated molars: a finite element analysis study

Lin

Zheng

2020

BMC Oral Health

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Background: The purposes of this simulation study were to evaluate the stresses in the roots of endodontically treated molars with extensive coronal tissue loss which were restored by endocrowns (all-in-one core and crown) and traditional crowns with post-cores, during masticatory simulation using finite element analysis. Methods: A mesio-distal cross-section of a lower right first molar was digitized and used to create 2-dimensional models of the teeth and supporting tissue; different crown designs, viz., endocrown with 2 mm occlusal clearance, endocrown with 4 mm occlusal clearance and post-core crown; different crown materials, viz., zirconia (Zr) and lithia-disilicate reinforced glass ceramic (LDRGC), and different post and core materials, viz., glass fiber (GF), stainless steel (SS) and metal cast (MC). An axial load of 600 N was applied to the central fossa of occlusal surface. Results: The stress distributions were similar between Zr and LDRGC for periodontal ligament and alveolar bone. The root canal inner wall maximum principal stresses of SS post (70.8 MPa) and MC post (71.4 MPa) were higher than that of GF post (36.0 MPa) and endocrown (2.4 MPa). Conclusion: The endocrowns reduced stress concentration for the root canal inner wall in comparison with the conventional post-core crown. Molars restored with endocrowns are less prone to root fracture than those with posts.

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The impact of restorative material and ceramic thickness on CAD\CAM endocrowns

Abstract: The impact of restorative material and ceramic thickness on CAD\CAM endocrowns e969

Cited by 20 publications

References 51 publications

Effect of Restorative Material on Mechanical Response of Provisional Endocrowns: A 3D—FEA Study

Effect of Restorative Material on Mechanical Response of Provisional Endocrowns: A 3D—FEA Study

Marginal adaptation and fracture strength of endocrowns manufactured with different restorative materials: SEM and mechanical evaluation

Effect of different restorative crown design and materials on stress distribution in endodontically treated molars: a finite element analysis study

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