Evaluation of the marginal and internal gaps of partially crystallized versus fully crystallized zirconia-reinforced lithium silicate CAD-CAM crowns: An in vitro comparison of the silicone replica technique, direct view, and 3-dimensional superimposition analysis

El-Ashkar, Alaa Samir; Taymour, Maha; El-Tannir, Adel

doi:10.1016/j.prosdent.2021.07.024

Cited by 19 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the crystallization process, the lithium silicate and meta-silicate crystals become smaller, and densification increases with a reduction in particle size for a close-packed arrangement [42]. Previous studies reported that densification shrinkage during the crystallization process affects the adaptation of ZLS crowns [8,24]. However, our study found no significant differences between VS and CD.…”

Section: Discussioncontrasting

confidence: 79%

See 1 more Smart Citation

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

Zheng

Wang

et al. 2022

BMC Oral Health

View full text Add to dashboard Cite

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.

show abstract

Section: Discussioncontrasting

confidence: 79%

“…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

View full text Add to dashboard Cite

show abstract

“…Up to the present moment, data regarding clinical performances of ZLS are limited, with a short term evaluation of full and partial coverage indirect restorations indicating a promising survival rate, 99% survival after 1 71 and 3 years 72 in function. ZLS restorations have also exhibited clinically acceptable marginal gaps, all <100 μm for tooth and implant supported restorations 73–75 . More clinical studies are required to confirm the long‐term performance of ZLS restorations as well as to investigated clinical complications.…”

Section: All‐ceramic Systemsmentioning

confidence: 99%

“…ZLS restorations have also exhibited clinically acceptable marginal gaps, all <100 μm for tooth and implant supported restorations. [73][74][75] More clinical studies are required to confirm the long-term performance of ZLS restorations as well as to investigated clinical complications.…”

Section: Glass-matrix Ceramicsmentioning

confidence: 99%

Indirect restorative systems—A narrative review

Bonfante

Calamita

Bergamo

2023

J Esthet Restor Dent

View full text Add to dashboard Cite

Objective: The background and clinical understanding of the properties of currently available indirect restorative systems and fabrication methods is, along with manufacturer and evidence-based literature, an important starting point to guide the clinical selection of materials for tooth and/or implant supported reconstructions. Therefore, this review explores most indirect restorative systems available in the market, especially all-ceramic, along with aspects of manufacturing process, clinical survival rates, and esthetic outcomes. Overview: Progressive incorporation of new technologies in the dental field and advancements in materials science have enabled the development/improvement of indirect restorative systems and treatment concepts in oral rehabilitation, resulting in reliable and predictable workflows and successful esthetic and functional outcomes. Indirect restorative systems have evolved from metal ceramics and polymers to glass ceramics, polycrystalline ceramics, and resin-matrix ceramics, aiming to improve not only biological and mechanical properties, but especially the optical properties and esthetic quality of the reconstructions, in attempt to mimic natural teeth. Conclusions: Based on several clinical research, materials, and patient-related parameters, a decision tree for the selection of indirect restorative materials was suggested to guide clinicians in the rehabilitation process. Clinical Significance: The pace of materials development is faster than that of clinical research aimed to support their use. Since no single material provides an ideal solution to every case, professionals must continuously seek information from well designed, long-term clinical trials in order to incorporate or not new materials and technological advancements.

show abstract

“…Then, another light silicone of a contrasting color is injected into the prosthesis, after which the silicon layers are removed and cuts are made to obtain longitudinal sections through which the marginal or internal fit can be studied using a light or an electronic microscope [8]. Tooth type, cement space, veneering porcelain, and firing cycles are the most important factors affecting the accuracy of the marginal fit [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Marginal Fit of Computer-Aided Design (CAD) and Computer-Aided Manufacturing (CAM) Zirconia Bridges Fabricated With Different Firing Cycles of Veneering Porcelain: An In Vitro Study

Chokr¹,

Alshaarani²,

Husein³

2023

Cureus

View full text Add to dashboard Cite

IntroductionZirconia provides adequate mechanical strength to be used as a framework for all ceramic prostheses. Such prostheses must be covered with suitable porcelain to obtain good aesthetic results. The aimTo study the effect of the firing cycle numbers of veneering ceramics (one cycle, two cycles, and three cycles) on the marginal fit of computer-aided design (CAD) and computer-aided manufacturing (CAM) zirconia bridges. Materials and methodsThe sample consisted of 30 full ceramic zirconia bridges, designed by CAD/CAM on a metal bridge model that was designed for this purpose. The sample was divided into three groups (N = 10); group A underwent a single firing cycle, group B underwent two cycles, and group C underwent three cycles. The copper model of the bridge was prepared to be a three-unit bridge, and the impressions of the metal models were taken to make zirconia cores. After that, the veneering ceramic layer and the micro-marginal gap were measured (in microns) on both the buccal and lingual surfaces of each bridge in the sample using the replica technique. A one-way ANOVA test was used to detect statistically significant differences between the groups. ResultsThere were no significant differences between the studied groups in binary comparison; however, the arithmetic mean values of the marginal gap in group C were greater than all the studied groups. ConclusionWithin the limitations of the current work, we found that increasing the number of firing cycles of zirconia cores affects the marginal fit; thus, it is recommended to follow the two firing cycle protocol for better adaptation of the CAD/CAM zirconia bridges.

show abstract

Evaluation of the marginal and internal gaps of partially crystallized versus fully crystallized zirconia-reinforced lithium silicate CAD-CAM crowns: An in vitro comparison of the silicone replica technique, direct view, and 3-dimensional superimposition analysis

Cited by 19 publications

References 23 publications

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

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

Indirect restorative systems—A narrative review

Evaluation of the Marginal Fit of Computer-Aided Design (CAD) and Computer-Aided Manufacturing (CAM) Zirconia Bridges Fabricated With Different Firing Cycles of Veneering Porcelain: An In Vitro Study

Contact Info

Product

Resources

About