Influence of material type, thickness and storage on fracture resistance of CAD/CAM occlusal veneers

Albelasy, Eman H.; Hamama, Hamdi H.; Tsoi, James Kit‐Hon; Mahmoud, Salah Hasab

doi:10.1016/j.jmbbm.2021.104485

Cited by 26 publications

(36 citation statements)

References 48 publications

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“…Resin nanoceramics (Lava Ultimate, LU) display high-impact fracture resistance, low modulus and high flexural strength, and lithium disilicate (IPS e.max CAD, Ivoclar Vivadent, Schaan, Liechtenstein) possess excellent biomechanical characteristics with a superior flexural strength beyond 400 MPa [ 11 , 12 ]. Therefore, LU and EMAX are often studied as thinner occlusal veneers to restore the occlusal appearance of defective teeth [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Resistance fracture of minimally prepared endocrowns made by three types of restorative materials: a 3D finite element analysis

Meng

Zhang

Chi

et al. 2021

J Mater Sci: Mater Med

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A thin endocrown restoration was often applied in endodontically treated teeth with vertical bite height loss or inadequate clinical crown length. A model of mandibular molars made by endocrown restoration with 1 mm thickness and 2 mm depth of pulp chamber was constructed and imported into FEA ANSYS v18.0 software. The three CAD/CAM materials, feldspathic (Mark2), lithium disilicate (EMAX), and lava ultimate (LU), were assigned, and the five load indenters were loaded on the full occlusal (FO), occlusal center (OC), central fossa (CF), buccal groove (BG), and mesiobuccal cusp (MC) of restoration in the model. The MinPS and MaxPS of the thin endocrown were significantly higher than those of tooth tissue in five types of loads except for the LU endocrown loaded in the FO group. The smaller the contact surface of the load was, the higher MaxPS and MinPS were. MaxPS and MinPS of the MC were the highest, followed by the BG and CF in the restoration. In the stress distribution of tooth tissue, MaxPS in the LU endocrown accumulated at the external edge of enamel and was significantly higher than MaxPS in Mark2 and EMAX endocrown concentrated on the chamber wall of dentin under OC, CF and BG loads. Within the limitations of this FEA study, the LU endocrown transferred more stress to tooth tissue than Mark2 and EMAX, and the maximum principal stress on endocrown restoration and tooth tissue at the mesiobuccal cusp load was higher than that at the central fossa and buccal groove load.

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Section: Introductionmentioning

confidence: 99%

Resistance fracture of minimally prepared endocrowns made by three types of restorative materials: a 3D finite element analysis

Meng

Zhang

Chi

et al. 2021

J Mater Sci: Mater Med

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show abstract

“…In this study, we constructed a model of endocrown restoration with a pulp chamber thickness of 1 mm and a depth of 2 mm by FEA and evaluated the stress distribution of the restoration made by LU, Mark2 and EMAX materials. Thin restorations were considered to accumulate more stress in the structures than thick restorations and may induce the formation of cracks and increase the failure risk in critical thickness restorations [14,26,27]. Therefore, 1 mm thickness of endocrown was selected as a critical thickness restoration to analyze the stress distribution.…”

Section: Discussionmentioning

confidence: 99%

“…The effect of material thickness on restoration fractures has been studied by some authors [14,16,26,32,33]. Thinner restorations accumulate more stress in the structures than thicker restorations and may cause the formation of cracks and increase the fracture risk in critical thickness.…”

Section: Discussionmentioning

confidence: 99%

“…Resin nanoceramics (Lava Ultimate, LU) display high-impact fracture resistance, low modulus and high exural strength, and lithium disilicate (IPS e.max CAD, Ivoclar Vivadent, Schaan, Liechtenstein) possesses excellent biomechanical characteristics with a superior exural strength beyond 400 MPa [11,12]. Therefore, LU and EMAX are often studied as thinner occlusal veneers to restore the occlusal appearance of defective teeth [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Resistance Fracture of Minimally Prepared Endocrowns Made By Three Types of Restorative Materials: A 3D Finite Element Analysis

Meng¹,

Zhang²,

Chi

et al. 2021

Preprint

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A thin endocrown restoration was often applied in endodontically treated teeth with vertical bite height loss or inadequate clinical crown length. A model of mandibular molars made by endocrown restoration with 1 mm thickness and 2 mm depth of pulp chamber was constructed and imported into FEA ANSYS v18.0 software. The three CAD/CAM materials, feldspathic (Mark2), lithium disilicate (EMAX) and lava ultimate (LU), were assigned, and the five load indenters were loaded on the full occlusal (FO), occlusal center (OC), central fossa (CF), buccal groove (BG) and mesiobuccal cusp (MC) of restoration in the model. The MinPS and MaxPS of the thin endocrown were significantly higher than those of tooth tissue in five types of loads except for the LU endocrown loaded in the FO group. The smaller the contact surface of the load was, the higher MaxPS and MinPS were. MaxPS and MinPS of the MC were the highest, followed by the BG and CF in the restoration. In the stress distribution of tooth tissue, MaxPS in the LU endocrown accumulated at the external edge of enamel and was significantly higher than MaxPS in Mark2 and EMAX endocrown concentrated on the chamber wall of dentin under OC, CF and BG loads. Within the limitations of this FEA study, the LU endocrown transferred more stress to tooth tissue than Mark2 and EMAX, and the maximum principal stress on endocrown restoration and tooth tissue at the mesiobuccal cusp load was higher than that at the central fossa and buccal groove load.

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“…A great number of scientific studies today are based on clinical research in the field of implantology and disorders in the oral cavity [1][2][3]. However, current computer-aided design/computer-aided manufacturing (CAD/CAM) technology exhibits an accelerated development due to a tenable progress in dental materials development [4][5][6][7][8][9]. One of the most utilized ceramic biomaterials that possesses a unique quality and covers a variety of dental indications is based on zirconia (ZrO 2 ) [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Impact of Sandblasting on Morphology, Structure and Conductivity of Zirconia Dental Ceramics Material

et al. 2021

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Over the last decade, zirconia (ZrO2)-based ceramic materials have become more applicable to modern dental medicine due to the sustained development of diverse computer-aided design/computer-aided manufacturing (CAD/CAM) systems. However, before the cementation and clinical application, the freshly prepared zirconia material (e.g., crowns) has to be processed by sandblasting in the dental laboratory. In this work, the impact of the sandblasting on the zirconia is monitored as changes in morphology (i.e., grains and cracks), and the presence of impurities might result in a poor adhesive bonding with cement. The sandblasting is conducted by using Al2O3 powder (25, 50, 110 and 125 µm) under various amounts of air-abrasion pressure (0.1, 0.2, 0.4 and 0.6 MPa). There has been much interest in both the determination of the impact of the sandblasting on the zirconia phase transformations and conductivity. Morphology changes are observed by using Scanning Electron Microscope (SEM), the conductivity is measured by Impedance Spectroscopy (IS), and the phase transformation is observed by using Powder X-Ray Diffraction (PXRD). The results imply that even the application of the lowest amount of air-abrasion pressure and the smallest Al2O3 powder size yields a morphology change, a phase transformation and a material contamination.

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Influence of material type, thickness and storage on fracture resistance of CAD/CAM occlusal veneers

Cited by 26 publications

References 48 publications

Resistance fracture of minimally prepared endocrowns made by three types of restorative materials: a 3D finite element analysis

Resistance fracture of minimally prepared endocrowns made by three types of restorative materials: a 3D finite element analysis

Resistance Fracture of Minimally Prepared Endocrowns Made By Three Types of Restorative Materials: A 3D Finite Element Analysis

Impact of Sandblasting on Morphology, Structure and Conductivity of Zirconia Dental Ceramics Material

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