Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials—Part II Microhardness

Vojdani, Mahroo; Torabi, Kianoosh; Rasaeipour, Sasan; Ghodsi, Safoura; Khaledi, Amir Ali Reza

doi:10.5005/jp-journals-10024-1559

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…Passos and colleagues have shown that the concentration of bleaching agents and the type of ceramics significantly influence the changes in microhardness (Passos et al, 2010). Torabi et al depicted that the hardness of overglazed or polished surfaces is affected more by exposure to bleaching agents compared to autoglazed ceramic surfaces (Torabi et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia

Tavangar

Mousavipour

Ansarifard

2021

Clinical & Exp Dental Res

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Objective: This study aimed to investigate the effects of bleaching on the color, translucency, surface roughness, and surface hardness of monolithic zirconia with external stainin .Methods: In this experimental study, 32 specimens of monolithic zirconia (1 Â 1 mm; shade A2) were divided into two groups based on random permuted blocks. Overglaze and staining procedures were performed with a yellow stain or a value stain (GC Stain).Baseline color, translucency, roughness, and surface hardness were measured. The specimens were then randomly bleached with hydrogen peroxide (HP) 40% (20 min, twice with a 1-week interval in between) as office bleaching or carbamide peroxide (CP) 20% (4 h per day for 14 days) as home bleaching. Finally, the color, translucency, surface roughness, and surface hardness were measured again.Results: Bleaching with CP and HP caused a perceptible change in the color of the specimens (ΔE > 2), although this change was within the clinically acceptable range (ΔE < 3.3). HP significantly reduced the surface hardness of the specimens (p = 0.043). Changes in surface roughness of the specimens were neither statistically nor clinically significant (p = 0.19 and p = 0.25 for office and home bleaching, respectively). Conclusion:The effects of home and office bleaching on the surface characteristics of monolithic zirconia were almost the same. It is not necessary to exchange or even to polish the surfaces of zirconia restorations after exposure to bleaching agents. Further studies are recommended to confirm the color stability of externally stained monolithic zirconia.

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Section: Discussionmentioning

confidence: 99%

The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia

Tavangar

Mousavipour

Ansarifard

2021

Clinical & Exp Dental Res

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“…Microhardness has drawn much attention in the literature because it is an important physical characteristic of dental materials. 15-18 Hardness of a material has been defined as its resistance against permanent surface indentation or penetration; it depends on a material’s strength, ductility, elastic stiffness, plasticity, strain, toughness, viscoelasticity and viscosity. A material’s ability to abrade or its susceptibility to abrasion by opposing teeth, materials, or being softened by chemical agents has a role in the clinical durability of dental restorations.…”

Section: Discussionmentioning

confidence: 99%

Effect of different bleaching strategies on microhardness of a silorane-based composite resin

Bahari

Oskoee

Mohammadi

et al. 2016

J Dent Res Dent Clin Dent Prospects

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Background. Dentists’ awareness of the effects of bleaching agents on the surface and mechanical properties of restorative materials is of utmost importance. Therefore, this in vitro study was undertaken to investigate the effects of different bleaching strategies on the microhardness of a silorane-based composite resin.Methods. Eighty samples of a silorane-based composite resin (measuring 4 mm in diameter and 2 mm in thickness) were prepared within acrylic molds. The samples were polished and randomly assigned to 4 groups (n=20). Group 1 (controls) were stored in distilled water for 2 weeks. The samples in group 2 underwent a bleaching procedure with 15% carbamide peroxide for two weeks two hours daily. The samples in group 3 were bleached with 35% hydrogen peroxide twice 5 days apart for 30 minutes each time. The samples in group 4 underwent a bleaching procedure with light-activated 35% hydrogen peroxide under LED light once for 40 minutes. Then the microhardness of the samples was determined using Vickers method. Data were analyzed with one-way ANOVA and post hoc Tukey tests (P < 0.05).Results. All the bleaching agents significantly decreased microhardness compared to the control group (P < 0.05). In addition, there were significant differences in microhardness between groups 2 and 4 (P = 0.001) and between groups 3 and 4 (P<0.001). However, no significant differences were detected in microhardness between groups 2 and 3 (P > 0.05).Conclusion. Bleaching agents decreased microhardness of silorane-based composite resin restorations, the magnitude of which depending on the bleaching strategy used.

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“…Bu aktif bileşenler serbest radikal oluşturmadan kromojenleri okside etmektedir. 37 Son yıllarda yayımlanmış bir meta-analizde, farklı laboratuvar çalışmalarının sonuçlarını karşılaştırılmış, daha beyaz dişlere sahip olmak isteyen ve diş hekimine gitmeden hızlı ve kolay bir yöntem arayan hastaların sıklıkla başvurduğu bir yöntem olan hidrojen peroksit içermeyen OTC ürünler kullanılarak yapılan ağartma işlemlerinin, peroksit kullanılan ağartma işlemlerine göre ağartma etkisinin daha az olduğu bildirilmiştir. 38 OTC ürünlerinin satışı ve kullanımı gün geçtikçe artmasına karşın bu ürünlerle ilgili güvenilir bir araştırma protokolü ve ağartma etkinliği ve güvenilirliği ile ilgili çok az sayıda kanıt mevcuttur.…”

Section: Otc Ile Ağartma Yönteminin Kompozit Rezin Yüzey Sertliğine E...unclassified

Effect of Vital Bleaching on Composite Resin Surface Hardness

TORBALI ÇOKKEÇECİ,

DENİZ ARISU

2024

ADO Klinik Bilimler Dergisi

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Günümüzde estetiğe verilen önemin artması ile vital ağartma tedavileri de popülerlik kazanmıştır. Estetik diş hekimliğinde ağartma uygulamaları oldukça hızlı sonuç veren konservatif tedavilerdir. Doğru teşhis ve tedavi planlaması ile başarılı sonuçlar elde edilmektedir. Ağartma tedavileri için farklı içerikte ve konsantrasyonda ürünler bulunmaktadır. Ağartmanın temel mekanizması dişlerde renklenmeye sebep olan büyük moleküllü bileşiklerin okside edici ajanlar aracılığıyla daha küçük moleküllere parçalanması prensibine dayanmaktadır. Diş dokusuna nüfus ederek ağartma etkisi gösteren okside edici ajanlar aynı zamanda hastanın mevcut kompozit rezin restorasyonlarında da çeşitli değişikliklere sebep olabilmektedir. Restoratif diş hekimliğinde özellikle çürük sebebi ile kaybedilen diş dokusunun tedavisinde en çok tercih edilen direkt restoratif materyal olan kompozit rezinlere toplumun çoğunluğunda her yaş grubundan hastada rastlanmaktadır. Vital ağartma tedavileri uygulanırken dişlerdeki mevcut kompozit restorasyonlarda oluşabilecek değişiklikler ve riskler göz önünde bulundurulmalıdır. Bu derlemenin amacı günümüzde popüler olan vital ağartma tedavilerinin kompozit rezin restorasyonların yüzey sertliği üzerindeki etkilerini incelemektir.

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Evaluation of the Effect of a Home Bleaching Agent on Surface Characteristics of Indirect Esthetic Restorative Materials—Part II Microhardness

Abstract: The contact of home bleaching agents with esthetic restorative materials is unavoidable. Therefore protecting these restorations from bleaching agents and reglazing or at least polishing the restorations after bleaching is recommended.

Cited by 9 publications

References 28 publications

The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia

The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia

Effect of different bleaching strategies on microhardness of a silorane-based composite resin

Effect of Vital Bleaching on Composite Resin Surface Hardness

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