Comparison of marginal adaptation and internal fit of monolithic lithium disilicate crowns produced by 4 different CAD/CAM systems

Ferrairo, Brunna Mota; Piras, Fernanda Furtado; Ferruzzi, Fernanda; Honório, Heitor Marques; Duarte, Marco Antônio Húngaro; Borges, Ana Flávia Sanches; Rubo, José Henrique

doi:10.1007/s00784-020-03511-1

Cited by 21 publications

(9 citation statements)

References 40 publications

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“…In contrast, a non-uniform gap may lead to the disintegration of the adhesive, thus resulting in the failure of cement or restorations 28) . In 2D methodology, the UI was calculated as the ratio of the gap size at the occlusal and axial regions based on limited data 29) . In the present study, UI was calculated as the standard deviation of the gaps at 197,000 data points of each abutment acquired by 3D measurement; thus it might be a more accurate protocol.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional fit of self-glazed zirconia monolithic crowns fabricated by wet deposition

Zhao

Sun

et al. 2022

Dent. Mater. J.

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This study evaluated the 3-dimensional (3D) fit of self-glazed zirconia monolithic crowns fabricated by wet deposition, in comparison with milled zirconia and lithium disilicate monolithic crowns. Dual-scan protocol was used to assess the fit of crowns. Root mean squares (RMS) and uniformity index (UI) were calculated to describe the gap size and uniformity. The self-glazed zirconia crowns had significantly lower RMS values for the gaps at axial wall and transition regions than the milled zirconia crowns, and for the gaps at occlusal region than both milled crowns. All 3 types of crowns had comparable RMS values for the gaps at marginal and chamfer regions and comparable UI values for both marginal and internal gaps. The 3D fit of the self-glazed zirconia monolithic crowns was clinically acceptable and they exhibited better fit at occlusal region than the milled crowns.

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Section: Discussionmentioning

confidence: 99%

Three-dimensional fit of self-glazed zirconia monolithic crowns fabricated by wet deposition

Zhao

Sun

et al. 2022

Dent. Mater. J.

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“…It also allowed the standardization of the marginal and internal fit of the restoration.Many potentially confounding operator variables were avoided such as dental laboratory technician's skills and procedures involved in the fabrication process. 16 A spacer thickness was set to be 50 µm which was recommended by Souzaet al2012 17 who evaluated marginal and internal discrepancies related to margin design of ceramic crowns fabricated by a CAD/CAM system and found that consensus on acceptable marginal adaptation-discrepancy established a range from 50 to 150 μm. On the other hand, keeping the cement thickness as minimal as possible helps to enhance achieving the accurate insertion of the prosthetic component and to allow interposition of a uniform layer of the cement with mean values 25 to 50 µm.…”

Section: Meteab Abdullah Salemmentioning

confidence: 99%

Marginal and Internal Adaptation of Occlusal Veneer Restorations: Effect of Material Type and Bonded Substrate

2021

Mansoura Journal of Dentistry

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Objective: To evaluate the effect of material type and bonded substrate on the marginal and internal adaptation of occlusal veneer restorations. Materials and methods: Ninety intact human mandibular molars were selected for this study, divided into three groups (N= 30) depending on three different martials of lithium disilicate ceramic (L), zirconia (Z) and hybrid ceramics (H) with the thickness of 1.0 mm. Each test groups divided into three subgroups (N=10) depending on the bonded substrate, subgroups (LD, LC and LF), subgroups (ZD, ZC and ZF) and subgroups (HD, HC and HF). Before cementation, discrepancies were measured at the margin (µm) of each occlusal veneer. Silicone replicas were obtained to measure marginal and internal discrepancies (µm) that was evaluated with stereomicroscope at 35X magnification. All occlusal veneers were cemented to their corresponding abutments using adhesive resin cement. After 24 hours water storage and thermocycling for 5000 cycles at 55-5 °C, specimens were subjected to dynamic loading in a chewing simulator with 120.000 loading cycles. Then marginal discrepancies (µm) were evaluated after final cementation. The data were statistically analysed using Wilcoxon signed Rank test and three-way ANOVA test was used for detection of effect of material type and bonded substrate on dependant outcome. Results: After cementation, significantly higher marginal discrepancies were notes in comparison with before cementation. Restorative materials significantly affected on the marginal and internal adaptation. Conclusions: Occlusal veneer bonded to dentin with filling composite showed better marginal and internal adaptation than bonded to dentin with prepared cavity and bonded to dentin. Hybrid ceramic restoration provided superior marginal and internal adaptation than zirconia and lithium disilicate restoration.

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“…As an in vitro experiment, this could not include in vivo factors, such as patient cooperation and contamination with saliva and blood during scanning processing. In addition, a single-tooth model and one scanning and milling system during the design and fabrication of CAD-CAM endocrowns eliminate inconsistencies but overlook diversity in the real world [9,44]. Further studies are required to understand the influence of clinical oral conditions and the diversity of the CAD-CAM system on the adaptation of endocrowns.…”

Section: Discussionmentioning

confidence: 99%

“…An inappropriate internal gap can increase the thickness of the cement, decrease the adhesive strength at the adhesive interface, and reduce the resistance to fracture of the restoration [1,5,6]. Marginal gaps of ≤ 120 μm and internal gaps of ≤ 200 μm have traditionally been considered clinically acceptable [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of virtual cement space and restorative materials on the adaptation of CAD-CAM endocrowns

Zheng

Wang

et al. 2022

BMC Oral Health

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Background This study aimed to evaluate the effect of virtual cement space and restorative materials on the fit of computer-aided design and computer-aided manufacturing (CAD-CAM) endocrowns. Methods A mandibular first molar tooth model received a butt joint margin endocrown preparation with a 2-mm occlusal thickness. Then, using a 3D-printing system, 120 copies of this prepared die were printed and assigned equally to three groups with different cement space settings (30, 60, and 120 μm) during the chairside CAD design. In the milling process, CAD-based models with a particular space setting were subdivided into four groups (n = 10) and fabricated from different CAD-CAM materials: Vita Suprinity (VS), Celtra Duo (CD), Lava Ultimate (LU), and Grandio blocs (GR). Finally, the endocrowns were stabilized over their corresponding models with siloxane and subjected to micro-computed tomography to measure the fit. Results The cement space that was predesigned at 30 μm generated the largest marginal discrepancy (from 144.68 ± 22.43 μm to 174.36 ± 22.78 μm), which was significantly different from those at 60 μm and 120 μm (p < 0.001). The combination of VS or CD with a pre-setting cement space of 60 μm and the combination of LU or GR with a cement space of 120 μm showed better agreement between the predesigned and actual measured marginal gap widths. For internal adaptation, only the cement space set to 30 μm exceeded the clinically acceptable threshold (200 μm). Conclusions The setting of the cement space and restorative material significantly affected the marginal adaptation of CAD-CAM endocrown restorations. Considering the discrepancy between design and reality, different virtual cement spaces should be applied to ceramic and resin composite materials.

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Comparison of marginal adaptation and internal fit of monolithic lithium disilicate crowns produced by 4 different CAD/CAM systems

Cited by 21 publications

References 40 publications

Three-dimensional fit of self-glazed zirconia monolithic crowns fabricated by wet deposition

Three-dimensional fit of self-glazed zirconia monolithic crowns fabricated by wet deposition

Marginal and Internal Adaptation of Occlusal Veneer Restorations: Effect of Material Type and Bonded Substrate

Effect of virtual cement space and restorative materials on the adaptation of CAD-CAM endocrowns

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