Effect of two Preparation Designs and Methods of Construction on the Fracture Resistance of Glass Ceramics Laminate Veneers

Elgamma, Mohamed A.; Othman, Hesham Ibrahim; Mohamed, Hussein Ramadan

doi:10.21608/ajdsm.2018.71582

Cited by 3 publications

(4 citation statements)

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“…(24) However, feather edge margin (group F) registered higher mean fracture load in compared to deep chamfer margin (group DC) which is confirmed by preceding investigations. (2,12,25) These promising outcomes were associated with method of stress distribution via increasing the force on the restoration at the feather edge margin design that diffused to the walls of axial surfaces than the margin of the supporting die, causing in stress concentration on the surface of occlusal of the restoration rather than the margin region.…”

Section: Discussionmentioning

confidence: 99%

Influence of Vertical versus Horizontal Margin Configuration on Fracture Resistance of Zirconia Copings Restorations with Varied Occlusal Thickness

Montaser

Gabal

Bayoumi

2023

Egyptian Dental Journal

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Objectives: To compare the influence of vertical (featheredge) margin configuration versus horizontal (deep chamfer) margin configuration on fracture resistance of zirconia copings with the different occlusal thicknesses (0.5mm and 1mm). Materials and methods:Two stainless steel master dies were designed and then milled to mimic the coping preparation of the upper first premolar tooth and duplicated by means of epoxy resin to yield forty dies. 40 epoxy dies were distributed into two groups (n=20) in relation to the margin configuration types; feather edge (F) group (n=20) and deep chamfer (DC) group (n=20). Each group was subdivided into two subgroups (n = 10) concerning varied occlusal thickness (0.5 and 1 mm). Copings were fabricated from zirconia blank. For the testing of fracture resistance, a universal testing machine was used by subjecting the samples to a fixed load till failure occurred. Statistical analysis was then performed.Results: Feather edge margin with (1mm) occlusal thickness registered the highest mean fracture load (1117.81±124.90N) followed by deep chamfer margin with (1mm) occlusal thickness (1000.73±148.84N). While the feather edge margin with (0.5mm) occlusal thickness registered the lowest mean fracture load (282.31± 45.69N) with no significant difference between groups.Conclusions: Vertical margin configuration margin has a more promising fracture resistance than horizontal margin configuration, especially in (1mm) occlusal thickness. Although (0.5mm) restorations occlusal thickness exceeds the maximum chewing forces reported in the literature.

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Section: Discussionmentioning

confidence: 99%

Influence of Vertical versus Horizontal Margin Configuration on Fracture Resistance of Zirconia Copings Restorations with Varied Occlusal Thickness

Montaser

Gabal

Bayoumi

2023

Egyptian Dental Journal

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“…Epoxy resin dies were used to substitute the natural abutments because of its close modulus of elasticity (11.8GPa) to that of the dentine (18.6GPa) (18) . The epoxy resin dies have successfully served to standardize the master die dimensions (19) . SEM images of the analyzed bilayered zirconia samples revealed that the fracture was originating from the occlusal surface (cone crack).…”

Section: Discussionmentioning

confidence: 99%

Fractographic Analysis of Monolithic and Bilayered Zirconia After Thermo-Mechanical Fatigue and Fracture Strength Test

Alzhairi¹,

Hamdy

Hamza

2022

Egyptian Dental Journal

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“…Then a dual cure resin cement (VariolinkEsthetic DC Ivoclar Vivadent) was applied on the intaglio surface of laminate veneer to ensure complete curing of the cement and it was used after monobond plus prime being used for conditioning of the intaglio surface of the restorations) then seated on their corresponding metal die and allow to set under a constant load of 1 kg for 20 s using a special customized cementing device and light polymerization was done on each surface for 40 s (Elgamma et al, 2018 ).…”

Section: Methodsmentioning

confidence: 99%

“…F I G U R E 2 Standardization of the reductions (a) guiding grooves created on the facial surfaces (b) Incisal reduction. MALALLAH AND HASAN | 1415surface of the restorations) then seated on their corresponding metal die and allow to under a constant load of 1 kg for 20 s using a special customized cementing device and light polymerization was done on each surface for 40 s(Elgamma et al, 2018).…”

mentioning

confidence: 99%

Thickness and yttria percentage influences the fracture resistance of laminate veneer zirconia restorations

Malallah

Hasan

2022

Clinical & Exp Dental Res

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Objectives Mechanical properties are cardinal for the long‐term clinical success of laminate veneer restorations but the selection of new restorative materials should ideally be based on clinical evidence, therefore, in vitro testing of dental materials is a good alternative to evaluate their properties and understand their behavior so this study aimed to compare and evaluate the effect of two different thicknesses and yttria percentage on the fracture resistance of laminate veneer zirconia restorations. Materials and Methods Forty laminate veneer restoration prepared from partial sintering zirconia of 3Y (yttria), 5Y (yttria), combined 3Y&5Y (yttria), and lithium disilicate. Specimens were assigned into four main groups according to their percentage of yttria content (n = 10) and subgrouped into two thicknesses (0.5 mm thickness and 0.3 mm thickness) (n = 5) as follows: Group I, II, III, and IV (Group I for lithium disilicate (control), Group II for 3Y zirconia, Group III for 5Y zirconia, and Group IV for combined 3Y&5Y zirconia), each of them subdivided according to their thickness into two subgroups (n = 5 for each one) and resistance to fracture for each restoration was evaluated using a universal testing machine. Data were analyzed using a one‐way analysis of variance and Duncan's tests at a 5% level of significance. Results The thickness of laminate veneer restoration significantly affects the fracture resistance value of all type of laminate veneers restorations (fracture resistance mean value was highest for 0.5 mm thickness and lower for 0.3 mm thickness restorations) and yttria percentage significantly affect fracture resistance value of zirconia laminate veneer restorations (fracture resistance mean value was highest for 0.5 mm thickness of 3Y zirconia [865 N] and combined 3Y&5Y zirconia [846 N]). Conclusions Reducing the thickness of laminate zirconia veneer restorations to 0.3 mm reduces its fracture resistance and increasing yttria percentage had an adverse effect on fracture resistance of zirconia laminate veneer restorations.

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Effect of two Preparation Designs and Methods of Construction on the Fracture Resistance of Glass Ceramics Laminate Veneers

Cited by 3 publications

References 0 publications

Influence of Vertical versus Horizontal Margin Configuration on Fracture Resistance of Zirconia Copings Restorations with Varied Occlusal Thickness

Influence of Vertical versus Horizontal Margin Configuration on Fracture Resistance of Zirconia Copings Restorations with Varied Occlusal Thickness

Fractographic Analysis of Monolithic and Bilayered Zirconia After Thermo-Mechanical Fatigue and Fracture Strength Test

Thickness and yttria percentage influences the fracture resistance of laminate veneer zirconia restorations

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