Marginal Accuracy of Monolithic Zirconia Crowns with Vertical and Horizontal Margin Configurations after Thermomechanical Fatigue

Almahdy, Reham; Mandour, Mona H.; Sharkawy, Zainab El

doi:10.21608/adjg.2021.63755.1340

Cited by 4 publications

(6 citation statements)

References 13 publications

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“…This conclusion supports the findings of the earlier investigation, which found that the feather edge preparation design had the least significant disagreement. (20) and coincides with the recent findings (21) Although there were statistical differences between the four groups in the current study, the marginal gap values of monolithic ceramic crowns were all within the range of clinically acceptable values.…”

Section: Discussionsupporting

confidence: 92%

Marginal adaptation related to margin design of CAD/CAM ceramic crowns

Fouad

2023

Egyptian Dental Journal

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Objectives: To ascertain how Feather edge and Chamfer finish line affect the marginal adaption of Zirconia reinforced lithium silicate glass-ceramic (ZLS) and Super transparent multilayered zirconia crowns (STML). Materials and Methods:Two mandibular molar typodont acrylic teeth with their long axes aligned perpendicular to the surface of the block, stabilized at their apex and inserted in epoxy resin that auto-polymerizes. Simulate all ceramic crown preparation, One with a 0.2mm featheredge margin (F). The other one with a chamfer finish line of 0.5mm (C). A total of 40 monolithic crowns were constructed; 20 crowns from each material: Group ZLS for Zirconia reinforced lithium silicate ceramic (Celtra Duo) CAD/CAM blocks, (Dentsply Sirona), Group STMLZ for Super translucent multilayered zirconia (Katana, Kurary Noritake Japan) (intermediate translucency and strength).Results: There was a significant interaction between the type of ceramic material and the finish line design on the marginal adaptation as indicated by ANOVA test. Feather edge finish line had better marginal adaptation with STML group than that of ZLS group. On the other hand, Chamfer finish line design for both ceramic groups showed no significant difference on marginal adaptation. Conclusions:The marginal adaptation was obviously affected by the different margin designs as well as the type of ceramic material used. Feather edge finish line proved to have better marginal adaptation specially with Zirconia ceramics. Chamfer finish line design gave an acceptable marginal adaptation with both Zirconia and Zirconia reinforced glass ceramic.

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Section: Discussionsupporting

confidence: 92%

Marginal adaptation related to margin design of CAD/CAM ceramic crowns

Fouad

2023

Egyptian Dental Journal

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“…The same findings have been reported by Comlekoglu et al 34 and Almahdy et al, 35 concluding that monolithic zirconia constructed with feather edge margins has better marginal accuracy than deep chamfer margin designs.…”

Section: Discussionsupporting

confidence: 85%

Marginal adaptation of different monolithic zirconia crowns with horizontal and vertical finish lines: A comparative in vitro study

Nasir,

kadhim

2023

J Dent Res Dent Clin Dent Prospects

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Background. This study evaluated the influence of different tooth preparation techniques and zirconia materials on marginal adaptation. Methods. Forty-eight healthy human maxillary first premolars were divided into two primary groups based on preparation design: group A (chamfer) and group B (vertical). Within each main group, there were three subgroups, comprising eight teeth each, distinguished by the type of zirconia material employed (Zircad LT, MT, and Prime by Ivoclar Vivadent). All the samples were prepared by the same operator using a dental surveyor. Intraoral scanning was performed on the prepared teeth. SironaInLab CAD 20.0 software was used to design crowns, which were subsequently generated using a 5-axis milling machine. The crowns were cemented to their respective teeth with self-adhesive resin cement. Marginal gap measurements were taken in micrometers (μm) before and after cementation at 16 sites per sample using a digital microscope at×230 magnification. The collected data were evaluated using statistical analysis using the independent t-test, paired t-test, and ANOVA at an 0.05 significance level. Results. The vertical preparation group exhibited the smallest marginal gap, while the chamfer group displayed the largest. This disparity was statistically significant (P<0.05) for pre- and post-cementation measurements across all materials. There were no significant differences between the different monolithic zirconia crowns. Conclusion. The vertical preparation design illustrated significantly better marginal adaptation than the chamfer preparation design. Comparisons between materials showed comparable marginal gaps. The mean values of the marginal gaps in all groups increased significantly after cementation.

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“…(33,36) Previous studies have found that feather edge preparations have several advantages, including minimal invasiveness preparation to preserve the biological tooth structures; particularly in the cervical area, simplicity in creating impressions, and exceptional marginal adaptation and integrity. (2,13,35) These findings support the use of feather edge preparations as a viable alternative in specific clinical scenarios, promoting the preservation of natural tooth structures and achieving favorable treatment outcomes.…”

Section: Marginal Gap (μM) (Mean Values )mentioning

confidence: 62%

“…Prior research has consistently advocated for the use of a deep chamfer finishing line rather than a shoulder one in all ceramic restorations, this preference can be attributed primarily to its rounded internal angles and increased thickness, both of which contribute to the improved biomechanical performance of posterior single all ceramic restorations, such characteristics have been shown to play an vital role in promoting the functionality and longevity of these dental restorations, making the deep chamfer finish line design a good clinical practice choice. (35) This study incorporated comparator groups consisting of chamfer and feather edge finish line designs, this choice was influenced by recommendations from certain authors, proposing that a chamfer finish line might be particularly suitable for small-size teeth and those with a smaller mesio-distal dimension, even though shoulder/deep chamfer finish lines may provide a superior fit. The preference for the chamfer finishing line design because of its more conservative nature and its ability to preserve the natural tooth structure with less intrusion.…”

Section: Marginal Gap (μM) (Mean Values )mentioning

confidence: 99%

The Effect of Preparation Design on the Marginal Adaptation of Monolithic Crowns Made of New CAD/CAM Ceramic Material An In-Vitro Study

Salem

2024

Ahram Canadian Dental Journal

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Aim: This study endeavors to evaluate how various finish line designs impact the marginal adaptation of all-ceramic crowns, which are fabricated using advanced lithium disilicate CAD/CAM material before and after a thermocycling process. Materials and methods: Twenty -Seven human maxillary first premolar teeth were selected for the present study, and they were categorized into three groups, each comprising nine teeth: Group 1 (DCh) featuring a deep chamfer margin design measuring 1mm, Group 2 (Ch) with a chamfer margin design measuring 0.5mm, and Group 3 (Verti) exhibiting a feather-edge margin design measuring 0.2mm. The crowns were constructed from advanced lithium disilicate glass ceramic material. For the cementation process, an adhesive resin cement was utilized to cement the fabricated crowns to their respective teeth. After cementation precise measurements of the marginal discrepancy were taken both before and after the specimens were subjected to thermocycling. To analyze the data, statistical methods such as analysis of variance (ANOVA) and Tukey's post-hoc test, significant difference at (P < 0.05) were used. Results: Before and after undergoing thermocycling, it was observed that the DCh group exhibited the highest mean marginal gap values (64.67 µm, 71.08 µm). This was followed by the Ch group (52.40 µm, 61.98 µm), whereas the Verti group displayed the lowest mean marginal gap values (41.74 µm, 44.86 µm). This disparity was statistically significant, as evidenced by the one-way ANOVA test results. (p =0.002<0.05). Upon employing the pair-wise Tukey's post-hoc test, the distinctions between the DCh group and the Ch group were found to be insignificance (p > 0.05). Conclusion: Considering the constraints inherent to this study, when compared to the other groups, the Verti group demonstrated significantly superior marginal adaptation both before and after the thermal aging process.

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Marginal Accuracy of Monolithic Zirconia Crowns with Vertical and Horizontal Margin Configurations after Thermomechanical Fatigue

Cited by 4 publications

References 13 publications

Marginal adaptation related to margin design of CAD/CAM ceramic crowns

Marginal adaptation related to margin design of CAD/CAM ceramic crowns

Marginal adaptation of different monolithic zirconia crowns with horizontal and vertical finish lines: A comparative in vitro study

The Effect of Preparation Design on the Marginal Adaptation of Monolithic Crowns Made of New CAD/CAM Ceramic Material An In-Vitro Study

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