Comparison of marginal and internal adaptation of three‐unit fixed dental prostheses made using CAD/CAM metal‐free materials

Baran, Melike Cigdem; Demirci, Fatih; Tuzlali, Mesut

doi:10.1111/eos.12901

Cited by 2 publications

(6 citation statements)

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“…The maximum clinically acceptable marginal gap value was determined at 120 µm [18,19]. Full ceramic prostheses have values of marginal fit ranging from 17 µm to 161 µm using different manufacturing systems (casted glass ceramics, reinforced core systems, and machine milling), as the fit value is affected by the type of the used system [20].…”

Section: Discussionmentioning

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

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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.

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Section: Discussionmentioning

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

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“…Baran et al [ 23 ] compared the marginal and internal adaptation of three-unit FDPs fabricated from cubic zirconia, fiber-reinforced resin composite, PEEK, polyetherketoneketone (PEKK), and polymer composite material using the silicone replica technique at 40X magnification under a stereomicroscope. The marginal gap values for the cubic zirconia material (51.76 ± 7.31 μm) were found to be significantly lower than those seen in the other materials with 67.44 ± 5.52 μm for the PEEK group, although all materials showed measurements within the clinically acceptable range.…”

Section: Discussionmentioning

confidence: 99%

“…The zirconia material has a bending strength of 1250 MPa, whereas high-performance polymers are known to have bending values equivalent to those of dentin. In light of these results, the zirconia group's improved marginal and internal adaptation in the current investigation can be attributed to the material's enhanced stability during milling compared to high-performance polymers [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…A power analysis test was conducted (G* Power v 3.1.9.2, Heinrich–Heine–Universität, Düsseldorf, Germany) based on the results of a previous study [ 23 ], and a sample size of 3 in each group had 95% power, an effect size of 4.26 with a significance level alpha (α) of 0.05 (two-tailed). A total of 18 crowns ( n = 18) were considered adequate in this study and divided into three groups according to the type of material and technique of fabrication of the PEEK coping; zirconia, milled PEEK CAD, and PEEK press six samples each ( n = 6).…”

Section: Methodsmentioning

confidence: 99%

“…To prevent wear of the luting cement, a marginal adaptation value in clinical situations for ceramic restorations of up to 120 µm was considered acceptable [ 22 ]. Poor marginal adaptation can cause dental plaque buildup, secondary caries, periodontal disorders, and eventually tooth loss [ 23 ]. Assessing the marginal adaptation of ceramic restorations utilizing both destructive and nondestructive methods has been described in previous studies [ 24 – 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of coping materials zirconia or polyetheretherketone with different techniques of fabrication on vertical marginal gap and fracture resistance of posterior crowns with composite veneering

Emam¹,

Metwally²

2023

BMC Oral Health

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Background Insufficient research has been conducted in the literature assessing the performance of zirconia and polyetheretherketone (PEEK) crowns in relation to the essential requirements of successful restorations, such as fracture resistance or margin adaptation. The purpose of this study was to evaluate the effect of the coping materials zirconia or PEEK with different fabrication techniques on the vertical marginal gap and fracture resistance of posterior crowns with composite veneering. Methods Ceramic copings (n = 18) restoring mandibular first molar were fabricated from zirconia (Zircon.x, Presidentdental, Germany), milled PEEK (PEEK CAD) (breCAM.BioHPP, Bredent, Germany) and pressed PEEK (PEEK Press) (BioHPP Granules, Bredent, Germany) six specimens each (n = 6). The copings were veneered with high impact polymer composite (HIPC) material (breCAM.HIPC, Bredent, Germany). The vertical marginal gap was captured under a magnification of 40X. Five equidistant marks on each surface of the die distinguished the points of measurement for a total of 20 readings per sample. The analysis was completed using an image analysis system (ImageJ 1.53t, National Institute of Health, USA). The specimens were loaded to failure at a crosshead speed of 1 mm/min and the load at failure was recorded to measure the fracture resistance. Results The marginal gap was analyzed using one-way ANOVA followed by Tukey’s post hoc test. Fracture resistance was analyzed using Welch one-way ANOVA followed by the Games-Howell post hoc test. Marginal gap values showed a significant difference between the tested groups, with zirconia having significantly lower gap values (48.67 ± 11.98 µm) than both the PEEK CAD (108.00 ± 20.08 µm) and Press groups (108.00 ± 25.10 µm) (p < 0.001). However, the results of fracture resistance showed no significant difference (p = 0.06) with 1687.47 ± 253.29 N, 2156.82 ± 407.64 N, 2436.72 ± 725.93 N for zirconia, PEEK CAD, and Press, respectively. The significance level was p < 0.05. Conclusions Zirconia framework crowns have a smaller vertical marginal gap than milled and pressed PEEK crowns. Crowns fabricated from zirconia, PEEK CAD, or PEEK Press frameworks and veneered with composite resin have comparable fracture resistance lower than the maximum biting force in the posterior region. Clinical relevance Posterior crowns with zirconia frameworks are preferred over milled and pressed PEEK frameworks regarding margin adaptation, although all can safely survive the maximum occlusal forces without fracture.

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Comparison of marginal and internal adaptation of three‐unit fixed dental prostheses made using CAD/CAM metal‐free materials

Cited by 2 publications

References 44 publications

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

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

Effect of coping materials zirconia or polyetheretherketone with different techniques of fabrication on vertical marginal gap and fracture resistance of posterior crowns with composite veneering

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