The effect of two marginal designs (chamfer and shoulder) on the fracture resistance of all ceramic restorations, Inceram: An in vitro study

Jalalian, E; Aletaha, Najmeh

doi:10.1016/j.jpor.2010.04.006

Cited by 21 publications

(23 citation statements)

References 12 publications

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“…With the use of alumina ceramics (In-Ceram), shoulder or chamfer finish line type also did not show significant differences in terms of immediate mean fracture strength. 14 In contrast, in another study where metal dies were used, ceramic optimized crowns with chamfer finish line presented significantly higher fracture strength than those with shoulder finish line. 15 It is notable that in previous studies focusing on the fracture strength of glass ceramic crowns, the experimental design did not involve a KE finish line as a comparison group, most probably due to the general conviction that this type of finish line would not allow sufficient strength to the brittle nature of the glass-based ceramics.…”

Section: Discussionmentioning

confidence: 87%

Durability and Weibull Characteristics of Lithium Disilicate Crowns Bonded on Abutments with Knife‐Edge and Large Chamfer Finish Lines after Cyclic Loading

Cortellini¹,

Canale

Souza

et al. 2014

Journal of Prosthodontics

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Section: Discussionmentioning

confidence: 87%

Durability and Weibull Characteristics of Lithium Disilicate Crowns Bonded on Abutments with Knife‐Edge and Large Chamfer Finish Lines after Cyclic Loading

Cortellini¹,

Canale

Souza

et al. 2014

Journal of Prosthodontics

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“…Multiple studies have been performed in order to evaluate the effect of margin design on load at fracture, but the results are inconclusive. Several studies find that the margin design has an effect on the fracture resistance , while others see no such effect . The large differences in study design among these trials complicate comparison and conclusions on this issue.…”

mentioning

confidence: 99%

Effect of margin design on fracture load of zirconia crowns

Skjold

Schriwer

Øilo

2018

European J Oral Sciences

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Zirconia‐based restorations are showing an increase as the clinicians’ preferred choice at posterior sites because of the strength and esthetic properties of such restorations. However, all‐ceramic restorations fracture at higher rates than do metal‐based restorations. Margin design is one of several factors that can affect the fracture strength of all‐ceramic restorations. The aim of this study was to assess the effect of preparation and crown margin design on fracture resistance. Four groups of bilayer zirconia crowns (with 10 crowns in each group) were produced by hard‐ or soft‐machining technique, with the following four different margin designs: chamfer preparation (control); slice preparation; slice preparation with an additional cervical collar of 0.7 mm thickness; and reduced occlusal thickness (to 0.4 mm) on slice preparation with an additional cervical collar of 0.7 mm thickness. Additionally, 10 hard‐machined crowns with slice preparation were veneered and glazed with feldspathic porcelain. In total, 90 crowns were loaded centrally in the occlusal fossa until fracture. The load at fracture was higher than clinically relevant mastication loads for all preparation and margin designs. The crowns on a chamfer preparation fractured at higher loads compared with crowns on a slice preparation. An additional cervical collar increased load at fracture for hard‐machined crowns.

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“…Considering the new option of all-ceramic crowns in deciduous dentitions, the present study showed that shoulder and chamfer types with margin thicknesses of 0.4-0.6 mm appeared to have lower peak EQVs of the primary molar root. Jalalian and Aletaha [44] concluded that the chamfer and shoulder marginal designs can be used in clinical dentistry. Furthermore, they showed that the chamfer type marginal design can improve the biomechanical performance of posterior single restoration, because of the better unity and fracture resistance in the permanent crowns.…”

Section: Discussionmentioning

confidence: 99%

“…The two aforementioned all-ceramic crowns consist of two groups, namely: non-silicate ceramic, called zirconia, and silicate ceramic with lithium disilicate within the glass matrix. Resin cement possesses superior mechanical properties, provides excellent retention, can withstand the stresses of the oral environment, and can maintain the integrity of the tooth structure [44]. Comparing total etch-and-rinse adhesives to the self-etching adhesive system, the latter is recommended for deciduous crowns, because this would reduce the complicated and sensitive clinical step.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Different Cervical Finish Lines of All-Ceramic Crowns on Primary Molars in Finite Element Analysis

et al. 2020

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This study aimed to conduct a stress analysis of four types of cervical finish lines in posterior all-ceramic crowns on the primary roots of molar teeth. Four different types of finish lines (shoulder 0.5 mm, feather-edged, chamfer 0.6 mm, and mini chamfer 0.4 mm) and two all-ceramic crown materials (zirconia and lithium disilicate) were used to construct eight finite element primary tooth models with full-coverage crowns. A load of 200 N was applied at two different loading angles (0 • and 15 • ) so as to mimic children's masticatory force and occlusal tendency. The maximum stress distribution from the three-dimensional finite element models was determined, and the main effect of each factor (loading type, material, and finish line types) was evaluated in terms of the stress values for all of the models. The results indicated that the loading type (90.25%) was the main factor influencing the maximum stress value of the primary root, and that the feather-edged margin showed the highest stress value (p = 0.002). In conclusion, shoulder and chamfer types of finish lines with a 0.4-0.6 mm thickness are recommended for deciduous tooth preparation, according to the biomechanical analysis.2 of 11 to both parents and children (because of their metallic appearance), time-consuming, and unprofitable. Resin-faced SSCs have emerged as a better alternative to metal SSCs, as they are more esthetic [10,11]. However, they are more prone to fracturing, debonding, and wearing of the buccal surface [12,13]. Pediatric all-ceramic crowns were introduced in 2010, and have gained popularity because of their improved esthetics and durability [12,[14][15][16]. These zirconia crowns are prefabricated [15] using computer-aided design/computer-aided manufacturing (CAD/CAM) systems [17]. Zirconia (ZrO 2 ), also known as ceramic steel, has favorable esthetics for primary teeth and has excellent mechanical properties, which include a high elastic modulus (215 Gigapascal (GPa)) and high flexure strength (1000 Megapascal (MPa)). Aiem et al. [18] found that zirconia crowns exhibited better gingival health and fewer crown fractures than the other ceramic crowns. Lithium disilicate (Li 2 Si 2 O 5 ) [19], a popular glass-ceramic material, was first used in 1998 and is named the Ivoclar Porcelain System (IPS) Empress 2 (Ivoclar Vivadent, Schaan, and Liechtenstein). IPS Empress 2 is a second-generation, heat-pressed lithium disilicate crystal embedded in a glassy matrix. Later, IPS e.max (Ivoclar Vivadent, Schaan, and Liechtenstein) entered the market using the heat-pressed CAD/CAM fabrication method, with a flexural strength (biaxial) reaching 400 ± 40 MPa [20] and a Young's modulus of 95 ± 5 GPa [20]. Glass-ceramic is more transparent than zirconia and is easier to surface-etch for resin cement bonding. However, all-ceramic crowns cannot be manipulated with crimping or contouring, and may require a passive fit and extensive tooth reduction.Prefabricated primary zirconia crowns are thicker than SSCs, with occlusal thicknesses varying from 1 to 2 mm ...

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The effect of two marginal designs (chamfer and shoulder) on the fracture resistance of all ceramic restorations, Inceram: An in vitro study

Cited by 21 publications

References 12 publications

Durability and Weibull Characteristics of Lithium Disilicate Crowns Bonded on Abutments with Knife‐Edge and Large Chamfer Finish Lines after Cyclic Loading

Durability and Weibull Characteristics of Lithium Disilicate Crowns Bonded on Abutments with Knife‐Edge and Large Chamfer Finish Lines after Cyclic Loading

Effect of margin design on fracture load of zirconia crowns

Comparison of Different Cervical Finish Lines of All-Ceramic Crowns on Primary Molars in Finite Element Analysis

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