Flexural strength of dental composite restoratives: Comparison of biaxial and three‐point bending test

Chung, Shin; Yap, Adrian Ujin; Chandra, Suresh; Lim, Chwee Teck

doi:10.1002/jbm.b.30103

Cited by 111 publications

(105 citation statements)

References 22 publications

(42 reference statements)

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“…Materyalin klinik başarısını belirleyen eğme, basma, elastisite ve sertlik olarak tanımlanan mekanik özelliklerini tespit etmek için mekanik testlerden yararlanılmaktadır. [28][29][30][31][32] ISO (International Organization for Standardization) standartları, materyalin fiziksel ve mekanik özelliklerini belirlemek için standart test tekniği olarak kabul edilmiştir. Çalışmamızda gruplara ait eğme direnci değerlerinin saptanmasında ISO 4049 standartlarına uygun olarak üç nokta eğme testi uygulandı.…”

Section: Tartiġmaunclassified

Fi̇berle Güçlendi̇rmeni̇n Nanofi̇l Kompozi̇ti̇n Eğme Di̇renci̇ne Etki̇si̇ni̇n İncelenmesi̇

Candan¹,

Eronat²,

Türkün³

2015

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Bu in vitro çalışmanın amacı; fiberle güçlendirmenin, nanofil kompozit materyalinin eğme direncine etkisinin araştırılmasıdır. Materyal ve Metod: Eğme direnci testi için ISO 4049 standartlarına uygun hazırlanan standart bir metal kalıp (2 ×2 ×25 mm) kullanılarak 60 örnek hazırlandı. Örnekler dört çalışma grubuna ayrıldı (n:15). Akışkan Kompozit (Filtek Flow)+Nanofil Kompozit (Filtek Supreme) (Grup I), Nanofil Kompozit (Kontrol) (Grup II), Akışkan Kompozit+Örgü Cam Fiber (Ever-Stick Net)+Nanofil Kompozit (Grup III), Örgü Cam Fiber+Nanofil Kompozit (Grup IV). Örnekler 24 saat 37 0 C de distile suda bekletildi. Daha sonra Universal Test cihazı ile üç nokta eğilme testine tabi tutuldu. Veriler istatistiksel olarak Kruskall Vallis ve Mann Whitney U testi kullanılarak analiz edildi. Her gruba ait üç örnek, taramalı elektron mikroskobunda (SEM) incelendi. Bulgular: Ortalama eğme direnci değerleri ve standart sapmaları Grup I, II, III ve IV de sırasıyla 93.6±4, 85.5±6, 107±9 ve 101±5 bulundu. Diğer gruplarla karşılaştırıldığında kontrol grubunun (Gr II) en düşük değere sahip olduğu belirlenirken en yüksek eğme direncinin akışkan kompozit ile beraber fiber uygulanan nanofil kompozit grubunda olduğu gözlendi (p<0.05). Kontrol grubu ile diğer gruplar arasında eğme direnci değerlerinin anlamlı bir farklılık gösterdiği belirlendi (p<0.05). Örnekler SEM ile incelendiğinde, fiber ile güçlendirilmiş gruplarda (GR III ve IV) meydana gelen kırılmanın gerilim bölgesine yerleştirilen fiberle sınırlı kaldığı saptandı. Sonuç: Bu in vitro çalışmanın sınırları içinde cam fiberle güçlendirmenin, nanofil kompozitin eğme direncini arttırdığı sonucuna varıldı. Örneklerde kırılmanın, gerilim bölgesinde fiberle sınırlı kaldığı; cam fiberin kırık stoperi olarak işlev yaptığı sonucuna varıldı.

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Section: Tartiġmaunclassified

Fi̇berle Güçlendi̇rmeni̇n Nanofi̇l Kompozi̇ti̇n Eğme Di̇renci̇ne Etki̇si̇ni̇n İncelenmesi̇

Candan¹,

Eronat²,

Türkün³

2015

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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“…The flexural modulus is lower than dimethacrylate base resin cements, such as Panavia F (Kuraray, Okayama, Japan), Unicem (3 M ESPE)) ∼7 GPa [14] or various CRs (3.45-11.3 GPa) [15]. Flexural strengths of other resin based cements range from 94 to 176 MPa [12], CRs ranged from 66 to 147 MPa [15]. All such values reported above were obtained from 3 point bending tests.…”

Section: Introductionmentioning

confidence: 96%

“…It was suggested monomethacrylate polymerizes with less cross linking due to molecular structure than dimethacrylate based resins [10], which results in lower flexural modulus [11]. CBM is reported to have lower elastic modulus and lower or similar flexural strengths than other dimethacrylate based resin cements or composite resins (CR) [12][13][14][15]. CBM has flexural modulus of 1.7 GPa [12], flexural strength reports varied from 88 [12] to 130 MPa [13].…”

Section: Introductionmentioning

confidence: 99%

“…CBM has flexural modulus of 1.7 GPa [12], flexural strength reports varied from 88 [12] to 130 MPa [13]. The flexural modulus is lower than dimethacrylate base resin cements, such as Panavia F (Kuraray, Okayama, Japan), Unicem (3 M ESPE)) ∼7 GPa [14] or various CRs (3.45-11.3 GPa) [15]. Flexural strengths of other resin based cements range from 94 to 176 MPa [12], CRs ranged from 66 to 147 MPa [15].…”

Section: Introductionmentioning

confidence: 99%

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In vitro evaluation of adhesive characteristics of 4-META/MMA-TBB resin with organic filler

et al. 2015

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Dentin Self etching a b s t r a c tObjectives. A commercial restorative material, BondfillSB (BF), is a modification of 4-META/MMA-TBB resin cement. BF uses a self-etching primer and added pre-polymerized organic fillers. We compared BF with another self-etching system, EasyBond (EB), in shear bond strength, bonded interface characteristics to human dentin and contraction gap when used in bulk-filling.Methods. Shear bond strength of BF and EB + Z100 (Z), bonded by different experience-level operators, was evaluated. Bonded interfaces were characterized by SEM, AFM, and AFM based nano-indentation. Contraction gaps (CG) at 0 h and 24 h after polymerization were evaluated for BF or EB bulk filled class I cavities. To meet the clinical recommendation, BF's powder was replaced by experimental radioopaque powder (BFO) for the CG study. EB was used with Z (EBZ) or with a resin marketed for bulk-fill base (SureFil-SDR-flow (EBSF)).Results. Shear bond strengths (Mean ± Standard Deviation (S.D.)) of BF (37.4 ± 2.6 MPa; n = 36) were higher and less variable than EBZ (18.2 ± 7.6 MPa; n = 36) (p < 0.0001, One-way ANOVA).Weibull characteristic strength (Á) differed significantly between materials (p < 0.0001) but not between operators (p = 0.90). EBZ often had non-uniform interfaces and a wider band of reduced elastic modulus (E) of greater than 20 m across the interface. BF had uniform interfaces and a smaller width of affected dentin under the interface (∼1 m). There was a difference in dentin-E between EBZ and BF up to 9 m from the interface (mixed-effects model; P = 0.03). A stratified linear regression model used for CG. EBSF and BFO showed significantly smaller CG than EBZ at time 0. None of three combinations showed any significant change between 0h-CG and 24h-CG.Significance. BF possessed bonding characteristics required to serve as a restorative.

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“…Proper polymerization is related to improved mechanical properties and may ultimately impact the longevity of the restorative procedures (ILIE; SIMO, 2012). One of the more commonly used laboratory tests for evaluating the mechanical properties of dental resin cements is the 3-point bending test, which is a useful test for determining the flexural strength and flexural modulus (elastic modulus) of the materials (CHUNG, et al 2004;DUYMUS, et al 2013;GONÇALVES, et al 2013). These mechanical properties are largely used for characterizing dental materials.…”

Section: Introductionmentioning

confidence: 99%

An alternative specimen preparation technique for 3-point bending tests on dual-cured dental resin cements

Oliveira¹,

Barreto²,

Oliveira-Neto³

et al. 2016

Biosci. J.

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ABSTRACT:The proper mechanical properties of resin cements are essential to the longevity of indirect restoration, whereas the 3-point bending test is recommended for measuring the flexural strength. The ISO 4049 specification requires light-curing of specimens in three consecutive points; however, this approach cannot be used for dual-cured resin cements. The aim of this study was to investigate the effect of two different specimen preparation techniques on the flexural strength and elastic modulus of experimental dual-cured resin cements immediately or 5 after minutes light curing. Experimental dual-cured resin cements were formulated, and the specimens of these cements were confectioned with the dimension of ISO 4049 specification. Light-activation was performed at one or three points immediately or 5 minutes after the insertion of cement into the matrix (n=7), resulting in four experimental conditions (2 methods × 2 moments of light-activation). The three-point bending test was performed and the values of the flexural strength and elastic modulus were recorded. Data were individually analyzed using 2-way ANOVA followed by the Tukey's post hoc test (P<0.05). Regardless of the points of light-activation, the specimens that were light-cured at 3 points showed the highest values of flexural strength. Only for light-activation at 1 point did the time before the light-activation affect the elastic modulus, whereas delayed light-activation had the highest values. In conclusion, the number of lightcuring points on specimen preparation for the 3-point bending test seems to affect the mechanical properties of dual-cured resin cements.

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Flexural strength of dental composite restoratives: Comparison of biaxial and three‐point bending test

Cited by 111 publications

References 22 publications

Fi̇berle Güçlendi̇rmeni̇n Nanofi̇l Kompozi̇ti̇n Eğme Di̇renci̇ne Etki̇si̇ni̇n İncelenmesi̇

Fi̇berle Güçlendi̇rmeni̇n Nanofi̇l Kompozi̇ti̇n Eğme Di̇renci̇ne Etki̇si̇ni̇n İncelenmesi̇

In vitro evaluation of adhesive characteristics of 4-META/MMA-TBB resin with organic filler

An alternative specimen preparation technique for 3-point bending tests on dual-cured dental resin cements

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