Placing Dental Composites—A Stressful Experience

Ferracane, Jack L.

doi:10.2341/07-bl2

Cited by 250 publications

(211 citation statements)

References 83 publications

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“…37 According to Hooke's law, stress is equal to the elastic modulus multiplied by the strain. 40 Thus, lower shrinkage, combined with the lower elastic modulus of both SIL and AL, can explain the decreased stress within the composite structure. A low modulus of elasticity of a material was not necessarily associated with high bond strength.…”

Section: Discussionmentioning

confidence: 99%

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

El-Sahn

El-Kassas

El-Damanhoury

et al. 2011

Operative Dentistry

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SUMMARY This study evaluated the microtensile bond strength (μ-TBS) of low-shrinkage composites with their corresponding adhesive systems, Filtek Silorane/Silorane adhesive (SIL, 3M ESPE AG, Seefeld, Germany) and Aelite LS/One-Step Plus (AL, BISCO Inc, Schaumburg, IL, USA) in cavities with different C-factors. Filtek Z250/Adper Single Bond Plus (Z, 3M ESPE, St Paul, MN, USA) was used as a control. Method Standardized Class I cavities were prepared in extracted human molars after removing occlusal enamel. Cavities were assigned into six different C-factors by applying nail polish to four walls, three walls, two walls adjacent to each other, two walls opposite to each other, one wall, or no walls. Resin composites with their corresponding adhesive systems were applied according to manufacturer instructions. Specimens were sectioned to obtain four rectangular beams from the center of the restorations and μ-TBS was measured. Data were analyzed by Weibull survival analysis. Shrinkage stresses of the resin composites were determined after 30 minutes from the start of light-curing using a tensometer testing machine. Flexure elastic modulus was determined using standard procedures, in accordance with ISO 4049. Data for shrinkage stress and elastic modulus were analyzed by one-way analysis of variance followed by a Tukey multiple-comparisons test (p<0.05). Results μ-TBS of both SIL and AL were not affected by different C-factors; however, the bond strength of Z decreased significantly when the C-factor increased. Shrinkage stress results were 0.94±0.1, 1.79±0.18, and 2.14±0.23 MPa for SIL, AL, and Z, respectively. The flexural modulus of both the SIL and the AL was significantly lower than that of Z. Conclusions Increasing C-factor did not negatively affect the bond strength of low-shrinkage composites.

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Section: Discussionmentioning

confidence: 99%

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

El-Sahn

El-Kassas

El-Damanhoury

et al. 2011

Operative Dentistry

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“…Furthermore, light-curing resins are frequently used in adhesive dentistry to bond ceramic restorations such as inlays, overlays, or crowns to dental hard tissues. However, despite widespread application, these resins suffer from shrinkage [4] and incomplete curing of the resin [5].…”

Section: Introductionmentioning

confidence: 99%

Use of NIR light and upconversion phosphors in light-curable polymers

et al. 2012

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OBJECTIVE: Light-curable polymers are commonly used in restorative surgery, prosthodontics and surgical procedures. Despite the fact of wide application, there are clinical problems due to limitations of blue light penetration: application is restricted to defects exposed to the light source, layered filling of defect is required. METHODS: Combining photo-activation and up conversion allows efficient polymer hardening by deep penetrating near-infrared (NIR) light. The prerequisite 450 nm blue light to polymerize dental resins could be achieved by filler particles, which absorb the incident NIR irradiation and convert it into visible light. RESULTS: The on spot generated blue light results in uniform polymer hardening. Composite samples of 5mm thickness were cured two times faster than pure polymer cured by blue light (30 and 60 s, respectively). Overall degree of monomer conversion resulted in higher values of more than 40%. The enhanced transmission of NIR light was confirmed by optical analysis of dentin and enamel. The NIR transmittance surge in the 800-1200 nm window could improve sealing of complex and deep caries lesions. SIGNIFICANCE: We demonstrate faster curing and an improved degree of polymerization by using upconversion filler particles as multiple light emission centers. This study represents an alternative approach in curing dental resins by NIR source. AbstractObjective. Light-curable polymers are commonly used in restorative surgery, prosthodontics and surgical procedures. Despite the fact of wide application, there are clinical problems due to limitations of blue light penetration: application is restricted to defects exposed to the light source, layered filling of defect is required.Methods. Combining photo-activation and up-conversion allows efficient polymer hardening by deep penetrating NIR light. The prerequisite 450 nm blue light to polymerize dental resins could be achieved by filler particles, which absorb the incident NIR irradiation and convert it into visible light.Results. The on spot generated blue light results in uniform polymer hardening.Composite samples of 5 mm thickness were cured two times faster than pure polymer cured by blue light (30 and 60 sec, respectively). Overall degree of monomer conversion resulted in higher values of more than 40 %. The enhanced transmission of NIR light was confirmed by optical analysis of dentine and enamel. The NIR transmittance surge in the 800÷1200 nm window could improve sealing of complex and deep caries lesions.Significance. We demonstrate faster curing and an improved degree of polymerization by using upconversion filler particles as multiple light emission centers. This study represents an alternative approach in curing dental resins by NIR source.3

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“…The current goal of the manufacturers of resin composite restorative materials remains improvement or elimination of contraction stress-possibly through low or non-shrinking monomers. 17 Research has shown that the amount of polymerization shrinkage may be reduced by an increase in filler particles. 8 Filler loading can be deceiving, however, because it may not be indicative of the presence of pre-polymerized filler particles.…”

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confidence: 99%

Properties of Hybrid Resin Composite Systems Containing Prepolymerized Filler Particles

Blackham¹,

Vandewalle²,

Lien³

2009

Operative Dentistry

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The incorporation of prepolymerized-filler particles in hybrid resin composite systems may result in a reduction of mechanical properties. SUMMARYThis study compared the properties of newer hybrid resin composites with prepolymerizedfiller particles to traditional hybrids and a microfill composite. The following properties were examined per composite: diametral tensile strength, flexural strength/modulus, Knoop microhardness and polymerization shrinkage. Physical properties were determined for each composite group (n=8), showing significant differences between groups per property (p<0.001). In general, the traditional hybrid composites (Z250, Esthet-X) had higher strength, composites containing pre-polymerized fillers (Gradia Direct Posterior, Premise) performed more moderately and the microfill composite (Durafill VS) had lower strength. Premise and Durafill VS had the lowest polymerization shrinkage.

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Placing Dental Composites—A Stressful Experience

Abstract: The inevitable generation of stress in dental composites that undergo polymerization shrinkage continues to mandate a precise and careful placement technique to ensure successful clinical outcomes.

Cited by 250 publications

References 83 publications

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

Use of NIR light and upconversion phosphors in light-curable polymers

Properties of Hybrid Resin Composite Systems Containing Prepolymerized Filler Particles

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