Mrginal Accuracy of Hybrid and different Machinable Ceramic Crowns

Mekkawi, El; Ossama, Walaa

doi:10.21608/edj.2020.32610.1147

Cited by 3 publications

(5 citation statements)

References 16 publications

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“…(24,25) The current results agree with Taha et al (2018). (26) These results contradict with El Mekawi (2020), (27) who recorded that Vita Enamic showed significantly better marginal accuracy than Celtra Duo. Many researchers, (10,(28)(29)(30) claimed that machinable hybrid CAD/CAM materials are more compatible with milling machine & exhibit better marginal quality.…”

Section: Discussionmentioning

confidence: 81%

“…This contradiction might be attributed to the effect of milling tools size & condition, as well as the type & microstructure of the materials affecting the performance of a CAD/ CAM system in terms of marginal accuracy. (27,28) Fracture is the main cause of ceramic failure. The fracture resistance results revealed significant difference between the three examined groups, where the group (BC) showed the highest fracture resistance followed by (CD), then (VE).…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of Marginal Accuracy & Fracture Resistance of Different CAD/CAM Fabricated Monolithic Vonlays

Asaad,

Fahim,

Kotb Salem

2024

Egyptian Dental Journal

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Objective: This research aimed to evaluate & compare marginal accuracy & fracture resistance of three different CAD/CAM fabricated monolithic vonlays. Materials & Methods:A typodont maxillary second premolar was prepared to receive thirty CAD/CAM monolithic vonlays. Three groups of different materials (n=10) were constructed. Group(CD): Zirconia-reinforced lithium silicate (Celtra Duo). Group(VE):Hybrid ceramic(Vita Enamic). Group(BC): Reinforced composite (BRILLIANT Crios). Measurement of vertical marginal gap distance was performed at 16 predetermined points without cementation. Fracture resistance test was conducted for cemented vonlays on their respective epoxy dies.Results: Difference in vertical marginal gap of the three groups was not statistically significant, while fracture resistance showed a significant difference between the three groups. Conclusions:The three tested materials offered vonlays with comparable & clinically acceptable marginal gaps. Concerning the fracture resistance, only Brilliant Crios & Celtra Duo vonlays were proven to have acceptable fracture resistance in premolar area, while Vita Enamic is not recommended as a vonlay in the same area.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Evaluation of Marginal Accuracy & Fracture Resistance of Different CAD/CAM Fabricated Monolithic Vonlays

Asaad,

Fahim,

Kotb Salem

2024

Egyptian Dental Journal

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“…The samples of VITA Enamic showed the lowest marginal gap values (29.5 μm ± 1.5). While, the samples of E-max CAD showed the highest marginal gap values (33.8 μm ± 0.75) [21] .…”

Section: Discussionmentioning

confidence: 88%

Marginal accuracy of Cad/Cam occlusal veneers fabricated from glass and hybrid ceramics with two preparation designs: An in vitro study

Salah¹,

Halim²,

Nabil³

2023

Int. J. Appl. Dent. Sci.

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Statement of the problem:Treatment of posterior teeth with occlusal wear is complex. Treatment involving more tooth reduction in these cases may be inappropriate. Occlusal veneers are less invasive approach. However, there is insufficient information available regarding the impact of the design of preparation and the type of ceramic material on the marginal adaptation of such occlusal veneers. Aim: This study aimed to examine marginal accuracy of occlusal veneers fabricated from two ceramic materials (Glass and Hybrid) with two designs of preparation (Planar and chamfer). Materials and Methods: Two mandibular first molar typodont teeth were prepared to receive 24 occlusal veneers. They were split into 2 equal groups (n=12) based on the material (Group (I): Lithium disilicate (Rosetta SM) occlusal veneers and Group (II): Hybrid ceramics (VITA ENAMIC) occlusal veneers). According to the preparatory design, each group then split into 2 subgroups (n=6)) (planar and finish line). Preparations were scanned, occlusal veneers were designed, milled and checked for seating under magnification. The vertical gaps between the cervical margin of the occlusal veneers and the outermost part of the finish line were measured using an optical microscope and image analysis software (20 readings per specimen). The mean vertical gap for each occlusal veneer was then calculated. Results: The Rosetta group showed a statistically non-significant higher gap mean value (26.32±3.61µm) than the Enamic group (23.15±5.15 µm) in the planar preparation design based on the results of student t-test (P=0. 2446 > 0.05). While for finish line preparation design, the Rosetta group recorded higher gap mean value (27.38±3.42 µm) than Enamic group (19.71±3.73 µm) and the difference was statistically significant confirmed by Student's t test (P = 0.004 < 0.05). Conclusion: Lithium disilicate ceramic and hybrid ceramic materials can be used to fabricate occlusal veneers. Superior vertical marginal fit was demonstrated using hybrid ceramic. More important than the preparation design is the veneer's material in terms of marginal accuracy.

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“…After Different superscript show statistical significance p≤0. 05 18 hours, although the VHN of all the tested groups dropped, yet there were no statistical significant difference in between the groups, unfortunately all tested groups except DW showed a significant drop in VHN after 36 hours [Table (5) and Figure (3)].…”

Section: Resultsmentioning

confidence: 99%

“…These new materials and systems have been established to fulfill the esthetic and functional demands for both patients and operators. Eliminating the need for many laboratory steps and obtaining a high quality of work, CAD/CAM has recently acquired a large popularity in the dental field and has nowadays been recommended rather than conventional esthetic indirect restorations, due to their premium esthetics and high mechanical characteristics (2,3) .…”

Section: Introductionmentioning

confidence: 99%

Effect of New Mouthwash on Color Stability and Microhardness of CAD/CAM Cerasmart Hybrid Ceramic Blocks

Fayed,

Aboelezz

2023

Egyptian Dental Journal

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The purpose of this study was to evaluate color stability and microhardness of CAD/CAM Cerasmart hybrid ceramic blocks after different immersion times in chlorohexidine and new plantbased mouth wash. Materials and Methods:A total of 120 square discs (10x12x1mm) were cut from 12 hybrid ceramic CAD\CAM blocks (shade A1\1M2, C12, 10x12x15mm, Cerasmart, GC) with a diamond blade (Isomet 15LC; Buehler) mounted in a cutting machine (Buehler). Specimens were divided into three equal groups (n=40) according to immersion media, either, distilled water (DW), chlorohexidine mouthwash (CM) (Orovex, Macro Group pharmaceuticals, Egypt) or Neem (Azadirachata indica) mouthwash (NM) (Neem Mouthwash, Theraneem Naturals, USA). Each group was subdivided into four equal subgroups (n=10) according to immersion time, either one hour and half, three hours, 18 hours or 36 hours. After each time interval, specimens were stored in DW at 37°C till time of evaluation of color change and micro-hardnesss.Results: Two ways ANOVA showed that the immersion media had a statistically significant effect on the VHN and ΔE of Cerasmart at a p-value= 0.0001 for both, also significance was detected for the effect of immersion time on the VHN and ∆ E of Cerasmart at a p-value= 0.0001 for both. Conclusion:Long term usage of antimicrobial mouthwashes used in this study (more than one year) should be avoided due to its negative effect on surface microhardness of the used resin based CAD/CAM restorations. Prolonged use of Neem mouthwash had a minimal effect on color change on the used resin based CAD/CAM restorations compared to CHX containing mouth wash (Orovex).

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Mrginal Accuracy of Hybrid and different Machinable Ceramic Crowns

Cited by 3 publications

References 16 publications

Evaluation of Marginal Accuracy & Fracture Resistance of Different CAD/CAM Fabricated Monolithic Vonlays

Evaluation of Marginal Accuracy & Fracture Resistance of Different CAD/CAM Fabricated Monolithic Vonlays

Marginal accuracy of Cad/Cam occlusal veneers fabricated from glass and hybrid ceramics with two preparation designs: An in vitro study

Effect of New Mouthwash on Color Stability and Microhardness of CAD/CAM Cerasmart Hybrid Ceramic Blocks

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