Comparison of marginal adaptation and internal fit of monolithic lithium disilicate crowns produced by four CAD-CAM systems

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems.

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Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

Brazilian Dental Journal ◽

10.1590/0103-6440201801916 ◽

2018 ◽

Vol 29 (4) ◽

pp. 342-346

Author(s):

Eduardo Piza Pellizzer1 ◽

Caroline Cantieri de Mello ◽

Jéssica Marcela de Luna Gomes ◽

Joel Ferreira Santiago Júnior ◽

Cleidiel Aparecido Araújo Lemos ◽

...

Keyword(s):

Reference Model ◽

Optical Microscope ◽

The Other ◽

Marginal Adaptation ◽

Nicr Alloy ◽

Partial Denture ◽

Optical Scanning ◽

Fixed Partial Denture ◽

Cad Cam ◽

Cam Systems

Abstract The aim of this is was evaluate the vertical and horizontal marginal adaptation of 3-unit fixed partial denture frameworks fabricated using different techniques and CAD/CAM systems. A total of 40 framework specimens were fabricated and divided into four groups as follows: lost-wax casting (G1); lost-wax casting with welding (G2); extraoral optical scanning of models (3S/DWOS) (G3); intraoral optical scanning (Cerec Bluecam/Sirona) (G4). A reference model was used to simulate a fixed partial denture with three elements (with a central pontic). The frameworks of G1 and G2 were cast in nickel-chromium (NiCr) alloy, whereas those of G3 and G4 were milled in zirconia. In all groups, vertical and horizontal marginal adaptation (over-contour and under-contour) was evaluated using a three-dimensional optical microscope (Quick Scope, Mitutoyo). The results showed higher vertical marginal misfit in G1 than in the other groups (p<0.001). Regarding horizontal marginal misfit, higher over-contour values occurred in G3 than in the other groups (p<0.001). G3 did not show under-contour at all, whereas the other groups did not differ from each other in this regard (p>0.05). Within the limitations of this study, it can be concluded that lost-wax casting with welding is a viable alternative to the use of CAD/CAM systems to fabricate frameworks of three-unit FPDs, since the techniques yielded similar vertical misfit values. Extra-oral CAD/CAM systems showed the highest horizontal misfit (over-contour) compared to other groups.

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Clinical evaluation of the fit of lithium disilicate crowns fabricated with three different CAD-CAM systems

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2020.06.031 ◽

2020 ◽

Author(s):

Jong-Ju Ahn ◽

Eun-Bin Bae ◽

Jin-Ju Lee ◽

Jae-Won Choi ◽

Young-Chan Jeon ◽

...

Keyword(s):

Clinical Evaluation ◽

Lithium Disilicate ◽

Cad Cam ◽

Cam Systems

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Analysis of marginal chipping of monolithic lithium disilicate crowns produced by four CAD-CAM systems

10.11606/d.25.2017.tde-08122021-181122 ◽

2017 ◽

Author(s):

Samira Sandy Ferreira Strelhow

Keyword(s):

Lithium Disilicate ◽

Cad Cam ◽

Cam Systems

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Effects of the Cervical Marginal Relocation Technique on the Marginal Adaptation of Lithium Disilicate CAD/CAM Ceramic Crowns on Premolars

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-3138 ◽

2021 ◽

Vol 22 (8) ◽

pp. 900-906

Author(s):

Mohammed M Al Moaleem ◽

Hafiz A Adawi ◽

Nasser M Alahmari ◽

Faris M Alqahtani ◽

Fahad T Alshahrani ◽

...

Keyword(s):

Lithium Disilicate ◽

Marginal Adaptation ◽

Cad Cam ◽

Ceramic Crowns

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Micro-computed tomography evaluation of marginal fit of lithium disilicate crowns fabricated by using chairside CAD/CAM systems or the heat-pressing technique

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2014.04.028 ◽

2014 ◽

Vol 112 (5) ◽

pp. 1134-1140 ◽

Cited By ~ 70

Author(s):

Flávio D. Neves ◽

Célio J. Prado ◽

Marcel S. Prudente ◽

Thiago A.P.N. Carneiro ◽

Karla Zancopé ◽

...

Keyword(s):

Computed Tomography ◽

Lithium Disilicate ◽

Micro Computed Tomography ◽

Marginal Fit ◽

Cad Cam ◽

Cam Systems

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Marginal Adaptation and Quality of Interfaces in Lithium Disilicate Crowns — Influence of Manufacturing and Cementation Techniques

Operative Dentistry ◽

10.2341/15-288-l ◽

2017 ◽

Vol 42 (2) ◽

pp. 185-195 ◽

Cited By ~ 7

Author(s):

CA Melo Freire ◽

GA Borges ◽

DBM Caldas ◽

RS Santos ◽

SA Ignácio ◽

...

Keyword(s):

Lithium Disilicate ◽

Optical Microscope ◽

Resin Cement ◽

Marginal Adaptation ◽

Interface Quality ◽

Cement Line ◽

Line Thickness ◽

Cad Cam ◽

Manufacturing Methods ◽

Adhesive Application

SUMMARY Purpose: To evaluate the cement line thickness and the interface quality in milled or injected lithium disilicate ceramic restorations and their influence on marginal adaptation using different cement types and different adhesive cementation techniques. Methods and Materials: Sixty-four bovine teeth were prepared for full crown restoration (7.0±0.5 mm in height, 8.0 mm in cervical diameter, and 4.2 mm in incisal diameter) and were divided into two groups: CAD/CAM automation technology, IPS e.max CAD (CAD), and isostatic injection by heat technology, IPS e.max Press (PRESS). RelyX ARC (ARC) and RelyX U200 resin cements were used as luting agents in two activation methods: initial self-activation and light pre-activation for one second (tack-cure). Next, the specimens were stored in distilled water at 23°C ± 2°C for 72 hours. The cement line thickness was measured in micrometers, and the interface quality received scores according to the characteristics and sealing aspects. The evaluations were performed with an optical microscope, and scanning electron microscope images were presented to demonstrate the various features found in the cement line. For the cement line thickness, data were analyzed with three-way analysis of variance (ANOVA) and the Games-Howell test (α=0.05). For the variable interface quality, the data were analyzed with the Mann-Whitney U-test, the Kruskal-Wallis test, and multiple comparisons nonparametric Dunn test (α=0.05). Results: The ANOVA presented statistical differences among the ceramic restoration manufacturing methods as well as a significant interaction between the manufacturing methods and types of cement (p<0.05). The U200 presented lower cement line thickness values when compared to the ARC with both cementation techniques (p<0.05). With regard to the interface quality, the Mann-Whitney U-test and the Kruskal-Wallis test demonstrated statistical differences between the ceramic restoration manufacturing methods and cementation techniques. The PRESS ceramics obtained lower scores than did the CAD ceramics when using ARC cement (p<0.05). Conclusions: Milled restorations cemented with self-adhesive resin cement resulted in a thinner cement line that is statistically different from that of CAD or pressed ceramics cemented with resin cement with adhesive application. No difference between one-second tack-cure and self-activation was noted.

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