The effect of preparation taper on the resistance to fracture of monolithic zirconia crowns

Schriwer, Christian; Gjerdet, Nils Roar; Arola, D.; Øilo, Marit

doi:10.1016/j.dental.2021.03.012

Cited by 9 publications

(14 citation statements)

References 48 publications

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“…The findings of this study are consistent with Rezende et al [ 5 ], who reported that thicker cement space associated with misfit increased stress concentrations for zirconia crowns. On the other hand, the results of this study disagree with Schriwer et al [ 23 ], who reported no significant effect for cement space on fracture strength of zirconia crowns. Unfortunately, the authors are unaware of available studies on the effect of cement spacer on zirconia FPDs to compare with the obtained results in the current research.…”

Section: Discussioncontrasting

confidence: 99%

“…The results for marginal and internal fit in the current research agree with Grajower and Lewinstein [ 37 ], who recommended the 50 μm spacer for better fit accuracy of fixed restorations. In addition, the results of the current research are consistent withKale et al [ 22 ], and Schriwer et al [ 23 ], who reported that the 30 μm spacer jeopardized the fit accuracy of CAD-CAM zirconia.On the other hand, the results of this study disagree with Suzuki et al [ 27 ] who reported better adaptation with 30 μm spacer compared to 45 μm. However, the spacer settings assessed in this study were different.…”

Section: Discussionsupporting

confidence: 91%

“…An in vitro study by Kale et al [ 22 ] reported better marginal fit of zirconia crowns with a cement spacer of 50 μm compared to 30 μm and 40 μm. A similar study by Schriwer et al [ 23 ] reported better fit accuracy with a spacer of 60 μm compared to 30 μm, with no significant effect of cement spacer on the fracture resistance. A systematic review study by Morsy et al [ 24 ] reported improved fit accuracy with a cement spacer ≤ 50 μm while two review studies by Hasanzade et al [ 25 , 26 ] reported better fit accuracy with a cement spacer ≤ 30 μm.…”

Section: Introductionmentioning

confidence: 62%

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Effect of cement spacer on fit accuracy and fracture strength of 3-unit and 4-unit zirconia frameworks

Morsy,

Ghoneim,

Ibrahim

2024

BMC Oral Health

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Background Cement spacer is essential for compensating deformation of zirconia restoration after sintering shrinkage, allowing proper seating and better fracture resistance of the restoration. Studies assessing the effect of cement spacer on fit accuracy and fracture strength of zirconia frameworks are missing in the literature. Therefore, the aim of this study was to evaluate the effect of different cement spacer settings on fit accuracy and fracture strength of 3-unit and 4-unit zirconia frameworks. Methods Sixty standardized stainless-steel master dies were manufactured with 2 prepared abutments for fabricating 3-unit and 4-unit zirconia frameworks. The frameworks were assigned into 6 groups (n = 10) according to cement spacer setting (30 μm, 50 μm, and 80 μm) as follows: 3-unit frameworks; 3u-30, 3u-50, 3u-80, and 4-unit frameworks; 4u-30, 4u-50, and 4u-80. The frameworks were assessed for fit accuracy with the replica method. The specimens were cemented to their corresponding dies, and the fracture strength was measured in a universal testing machine. The Weibull parameters were calculated for the study groups and fractured specimens were inspected for failure mode. Two-Way ANOVA followed by Tukey test for pairwise comparison between study groups (α = 0.05). Results The cement spacer had a significant effect on both fit accuracy and fracture strength for 3-unit and 4-unit frameworks. The 50 μm spacer had significantly better fit accuracy followed by 80 μm, and 30 μm spacers. Both 50 μm and 80 μm spacers had similar fracture strength, and both had significantly better strength than 30 μm spacer. Conclusions For both 3-unit and 4-unit zirconia frameworks, 50 μm cement spacer can be recommended over 30 μm and 80 μm spacers for significantly better fit accuracy and adequate fracture strength.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 62%

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Effect of cement spacer on fit accuracy and fracture strength of 3-unit and 4-unit zirconia frameworks

Morsy,

Ghoneim,

Ibrahim

2024

BMC Oral Health

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“…On the contrary, there are several studies (29) (30) against the result of this study and the disagreement may be due to the concept of preserving more amount of sound tooth structure increasing the fracture resistance.…”

Section: As In Palacios R P Et Al (2006)contrasting

confidence: 64%

Influence of Different Vonlay Preparation Designs on Fracture Resistance

Sayed

waz²,

mohamed³

2022

Egyptian Dental Journal

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Objectives: This research aimed to evaluate the influence of different vonlay preparation designs on fracture resistance in comparison with full coverage ceramic crown (as a control group) Methods: Thirty fresh extracted upper four teeth were collected from the orthodontic clinic in Minia and Nahda university. Teeth were divided according to the design of vonlay preparation into three groups. In Group (A); the control group the teeth were prepared to receive full coverage lithium-disilicate crowns (n=10), Group (B); teeth were prepared to receive bonded partial restoration (vonlay) involving functional cusp (n=10), and Group (C); teeth were prepared to receive bonded partial restoration (vonlay) without involving functional cusp (n=10). Then, by using a universal testing machine, samples were loaded along the long axis of the teeth until they fractured, and the maximum breaking load was recorded, as well as fracture patterns were noted. All samples were exposed to thermo-mechanical aging before testing.Results: preparation design of vonlay influences the fracture resistance of restoration.

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“…The Poisson ratio of epoxy (0.31 μ) is similar to that of dentin (0.3 μ) [ 21 ]; therefore, the degree of bulging of the epoxy model was expected to be similar to dentin during mastication when subjected to the same occlusal load. The bulging causes the development of hoop stress that causes the fracture [ 41 ]. They also showed twist hackles which are formed due to a new stress direction, having the appearance of lances where the small hackle lines merge, as well as arrest lines.…”

Section: Discussionmentioning

confidence: 99%

The effect of cyclic loading on the fracture resistance of 3D-printed and CAD/CAM milled zirconia crowns—an in vitro study

Refaie,

Bourauel,

Fouda

et al. 2023

Clin Oral Invest

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Objectives The aim of this study was to evaluate the effect of cyclic mechanical loading on the fracture resistance of 3D-printed zirconia crowns in comparison to milled zirconia crowns. Materials and methods Monolithic zirconia crowns (n = 30) were manufactured using subtractive milling (group M) and 3D additive printing (group P). Nine samples of each group were fractured under one-time loading while the other 6 samples were subjected to cyclic loading for 1.2 million cycles before being subjected to one-time loading until fracture. Scanning electron microscope (SEM) fractographic analysis was carried out on fractured fragments of representative samples. Results The mean for fracture resistance of group M was 1890 N without cyclic loading and 1642 N after being subjected to cyclic loading, and they were significantly higher than that of group P (1658 N and 1224 N respectively). Conclusions The fabrication technique and cyclic loading affect the fracture resistance of zirconia crowns. Although the fracture resistance values for the 3D-printed crowns were lower than those of the milled, still they are higher than the masticatory forces and thus could be considered being clinically acceptable. Clinical relevance Concerning fracture resistance, 3D-printed crowns can withstand the masticatory forces for the long term without any cracks or failure.

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The effect of preparation taper on the resistance to fracture of monolithic zirconia crowns

Cited by 9 publications

References 48 publications

Effect of cement spacer on fit accuracy and fracture strength of 3-unit and 4-unit zirconia frameworks

Effect of cement spacer on fit accuracy and fracture strength of 3-unit and 4-unit zirconia frameworks

Influence of Different Vonlay Preparation Designs on Fracture Resistance

The effect of cyclic loading on the fracture resistance of 3D-printed and CAD/CAM milled zirconia crowns—an in vitro study

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