Effect of material properties on stresses at the restoration–dentin interface of composite restorations during polymerization

Kahler, Bill; Kotousov, Andrei; Borkowski, Krzysztof

doi:10.1016/j.dental.2005.10.005

Cited by 25 publications

(7 citation statements)

References 14 publications

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“…[22][23] From this viewpoint, the lowest flexural modulus presented by Supreme could have increased its plastic flow, principally in the early, rigid stage of the polymerization reaction 10,24 and, consequently, less shrinkage stress was transferred to the resin-dentin interface. This thought is supported by a recent study by Kahler and others, 25 who developed an analytical model of shrinkage stress and investigated the effect of restorative material properties on stresses at the dentin-restoration interface. It was shown that resin-based restorative materials with a lower Young's modulus could lead to less stress at the restoration interface.…”

Section: Discussionsupporting

confidence: 51%

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The Influence of C-factor, Flexural Modulus and Viscous Flow on Gap Formation in Resin Composite Restorations

Silva¹,

Santos²,

Guimarães³

et al. 2007

Operative Dentistry

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SUMMARYThis study analyzed the influence of C-factor, flexural modulus and viscous flow on gap formation in resin composite restorations. Two resin composites, a mini-filled hybrid (P 60) and a nanofilled (Supreme), were used. The flexural modulus was obtained from bar-shaped specimens submitted to three-point bending. Viscous flow was obtained from the difference between the initial and final diameter of resin composite disks submitted to a load of 10 N for 120 seconds. Gap analysis was conducted in three types of cylindrical cavities (C-factor of 1.8, 2.6 and 3.4) that were prepared on the occlusal surfaces of human molars. The gap width at the dentin-resin composite interface was measured using a 3D scanning system (Talyscan 150). The data were analyzed by ANOVA and Student-Newman-Keuls' test, t-test and linear regression analysis (α=0.05). The cavities with C-factor 3.4 presented the highest Gap formation (p<0.0001). The lowest Gap formation was found in cavities restored with Supreme resin composite (p<0.0001). P 60 presented significantly higher flexural modulus and lower viscous flow than Supreme (p<0.0001). Regression analyses detected a significant influence of flexural modulus and viscous flow on gap formation (p<0.05).

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Section: Discussionsupporting

confidence: 51%

“…The nonagglomerated silica nanoparticles with a mean size of 20 nm (Table 1) may have caused a light-scattering effect in Supreme. From this premise, it is reasonable to speculate that, in 3.0 mm deep cavities, the degree of conversion could be reduced and, consequently, polymerization shrinkage [24][25][26][27][28] and gap formation.…”

Section: Discussionmentioning

confidence: 99%

The Influence of C-factor, Flexural Modulus and Viscous Flow on Gap Formation in Resin Composite Restorations

Silva¹,

Santos²,

Guimarães³

et al. 2007

Operative Dentistry

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“…with resin composite undergo polymerisation contraction that generates stress within the resin composite and also at the restoration-tooth interface 1,2) . This stress has been shown to lead to gap formation at the restoration-tooth interface 3,4) .…”

Section: Restorationsmentioning

confidence: 99%

Non-destructive assessment of cavity wall adaptation of class V composite restoration using swept-source optical coherence tomography

et al. 2011

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The purpose of this study was to evaluate gap formations under class V restoration using swept-source optical coherence tomography (SS-OCT). Wedge-shaped cavities were prepared on the buccal surface of 40 extracted premolar teeth at 2 locations; 1) cementoenamel junction (CEJ) with enamel and cementum margin and 2) root surfaces with cementum margin. The cavity was treated with Clearfil S 3 Bond, restored with Clearfil Majesty and polished with abrasive disks. The specimens were kept in water at 37°C for 24 hours and subjected to a thermocycling procedure. Gap formations at the tooth-restoration interface were measured with SS-OCT image and conventional dye leakage under a microscope. There was no effect of the locations of the cavity and the margins of the cavity on the gap formation. Therefore, a significant effect of the observational methods was observed. The gap formation was 0.89±0.48 mm with the SS-OCT, and the gap formation was 0.34±0.41 mm with the dye leakage. The observation with SS-OCT demonstrated a greater degree of gap formation than the observation with dye leakage.

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“…Teeth were previously modeled in many ways, and stress and strain were calculated. Two-dimensional ͑2-D͒ and 3-D models were constructed by approximating a tooth with a cylinder 28 or a parallelepiped. 17 More realistic mechanical models were obtained by computerized tomography 29 ͑CT͒ or laser scanning of a real tooth.…”

Section: Mechanical Model and Finite Element Calculation Of Mechanicamentioning

confidence: 99%

Holographic detection of a tooth structure deformation after dental filling polymerization

Pantelić¹,

Blažić

Savić-Šević³

et al. 2007

J. Biomed. Opt.

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An experimental technique to reveal the effects of dental polymer contraction is established to choose the most appropriate polymerization technique. Tooth deformation following a dental filling polymerization is analyzed using double-exposure holographic interferometry. A caries-free, extracted human molar is mounted in dental gypsum and different cavity preparations and fillings are made on the same tooth. Dental composite fillings are polymerized by an LED light source especially designed for this purpose. Holographic interferograms are made for occlusal (class I), occlusomesial (class II), and mesioocclusodistal (class II MOD) cavities and fillings. Maximum intercuspal deformation ranges from 2 microm for the class I cavity to 14 mum for the MOD class cavity. A finite element method (FEM) is used to calculate von Mises stress on a simplified tooth model, based on experimental results. The stress varies between 50 and 100 MPa, depending on the cavity type.

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Effect of material properties on stresses at the restoration–dentin interface of composite restorations during polymerization

Cited by 25 publications

References 14 publications

The Influence of C-factor, Flexural Modulus and Viscous Flow on Gap Formation in Resin Composite Restorations

The Influence of C-factor, Flexural Modulus and Viscous Flow on Gap Formation in Resin Composite Restorations

Non-destructive assessment of cavity wall adaptation of class V composite restoration using swept-source optical coherence tomography

Holographic detection of a tooth structure deformation after dental filling polymerization

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