Randomized Clinical Trial on Single Zirconia Crowns with Feather-Edge vs Chamfer Finish Lines: Four-Year Results

Cagidiaco, Edoardo Ferrari; Discepoli, Nicola; Goracci, Cecilia; Carboncini, Fabio; Vigolo, Paolo; Ferrari, Marco

doi:10.11607/prd.4270

Cited by 18 publications

(33 citation statements)

References 20 publications

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“…3,5,24 Moreover, a clinical study revealed that the performance of full-contour zirconia crowns with feather edge and chamfer finish lines Table 1 Burke's classification for the mode of fracture showed no differences in survival and success rates after 4 years of clinical service. 25 The findings of this study are inconsistent with Reich et al 17 and Beuer et al 26 ; they concluded that zirconia coping with knife edge preparations had higher fracture loads related to those with the chamfer preparations. However, they used zirconia copings while monolithic zirconia crowns were tested in the current study.…”

Section: Discussioncontrasting

confidence: 90%

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Fracture Strength of Monolithic Zirconia Crowns with Modified Vertical Preparation: A Comparative In Vitro Study

Abdulazeez

Majeed

2021

Eur J Dent

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Objective The aim of this study was to evaluate the influence of different marginal designs (deep chamfer, vertical, and modified vertical with reverse shoulder) on the fracture strength and failure modes of monolithic zirconia crowns. Materials and Methods Thirty sound human maxillary first premolar teeth with comparable size were used in this study. The teeth were divided randomly into three groups according to the preparation design (n = 10): (1) group A: teeth prepared with a deep chamfer finish line; (2) group B: teeth prepared with vertical preparation; and (3) group C: teeth prepared with modified vertical preparation, where a reverse shoulder of 1 mm was placed on the buccal surface at the junction of middle and occlusal thirds. All samples were scanned by using an intraoral scanner (CEREC Omnicam, Sirona, Germany), and then the crowns were designed by using Sirona InLab 20.0 software and milled with a 5-axis machine. Each crown was then cemented on its respective tooth with self-adhesive resin cement by using a custom-made cementation device. A single load to failure test was used to assess the fracture load of each crown by using a computerized universal testing machine that automatically recorded the fracture load of each sample in Newton (N). Statistical Analysis The data were analyzed statistically by using one-way analysis of variance test and Bonferroni test at a level of significance of 0.05. Results The highest mean of fracture load was recorded by chamfer (2,969.8 N), which followed by modified vertical (2,899.3 N) and the lowest mean of fracture load was recorded by vertical (2,717.9 N). One-way ANOVA test revealed a significant difference among the three groups. Bonferroni test showed a significant difference between group A and group B, while a nonsignificant difference was revealed between group C with group A and group B. Conclusion Within the limitations of this in vitro study, the mean values of fracture strength of monolithic zirconia crowns of all groups were higher than the maximum occlusal forces in the premolar region. The modification of the vertical preparation with a reverse shoulder placed at the buccal surface improved the fracture strength up to the point that it was statistically nonsignificant with the chamfer group.

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Section: Discussioncontrasting

confidence: 90%

“… 3 5 24 Moreover, a clinical study revealed that the performance of full-contour zirconia crowns with feather edge and chamfer finish lines showed no differences in survival and success rates after 4 years of clinical service. 25 …”

Section: Discussionmentioning

confidence: 99%

Fracture Strength of Monolithic Zirconia Crowns with Modified Vertical Preparation: A Comparative In Vitro Study

Abdulazeez

Majeed

2021

Eur J Dent

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“…The introduction of high strength ceramics with superior mechanical properties in thin sections has allowed the clinician to use vertical preparations ending with feather edge finish line for full ceramic restorations. The main advantages of vertical preparations are minimal invasiveness and preservation of the biological structures especially in the cervical area, less amount of loss of tooth structure, impression making is more easier, and high marginal adaptation and integrity (13,14) .…”

Section: Discussionmentioning

confidence: 99%

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

Almahdy¹,

Mandour

Sharkawy

2022

ADJ-for Girls

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“…Today, monolithic zirconia is a popular material for the fabrication of single crowns, short- and long-span fixed dental prostheses, and full-arch restorations [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Zirconia has been advocated as a valid treatment option for single-tooth restoration [ 2 , 3 , 4 , 5 , 8 ]. This is owing to its inherent esthetic and mechanical properties [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Fit, Precision, and Trueness of 3D-Printed Zirconia Crowns Compared to Milled Counterparts

Abualsaud

Alalawi

2022

Dentistry Journal

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Precise fit of a crown and accurate reproduction of the digital design are paramount for successful treatment outcomes and preservation of clinician and technician time. The study aimed to compare the internal fit, marginal adaptation, precision, and trueness of 3D-printed zirconia crowns compared to their milled counterpart. A total of 20 monolithic 3 mol% yttria stabilized-zirconia crowns (n = 10) were made using computer-assisted design (CAD) followed by additive (3D-printed) and subtractive (milled) manufacturing. Digital scanning of the master die with and without a fit checker followed by image superimposition, and analysis was performed to evaluate internal and marginal adaptation in four areas (occlusal, axial, marginal, and overall). ISO 12836:2015 standard was followed for precision and trueness evaluation. Statistical analysis was achieved using a t-test at α = 0.05. Internal fit and marginal adaptation revealed no significant difference between the two test groups (p > 0.05). The significant difference in trueness (p < 0.05) was found between the two groups in three areas (occlusal, axial, and internal). The best and worst trueness values were seen with 3D-printed crowns at occlusal (8.77 ± 0.89 µm) and Intaglio (23.90 ± 1.60 µm), respectively. The overall precision was statistically better (p < 0.05) in the 3D-printed crowns (9.59 ± 0.75 µm) than the milled (17.31 ± 3.39 µm). 3D-printed and milled zirconia crowns were comparable to each other in terms of internal fit and marginal adaptation. The trueness of the occlusal and axial surfaces of 3D-printed crowns was better, whereas the trueness of fitting surface of milled crowns was better. 3D-printed crowns provided a higher level of precision than milled crowns. Although the internal and marginal fit of both production techniques were comparable, 3D printing of zirconia produced more precise crowns.

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Randomized Clinical Trial on Single Zirconia Crowns with Feather-Edge vs Chamfer Finish Lines: Four-Year Results

Cited by 18 publications

References 20 publications

Fracture Strength of Monolithic Zirconia Crowns with Modified Vertical Preparation: A Comparative In Vitro Study

Fracture Strength of Monolithic Zirconia Crowns with Modified Vertical Preparation: A Comparative In Vitro Study

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

Fit, Precision, and Trueness of 3D-Printed Zirconia Crowns Compared to Milled Counterparts

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