In situ evaluation of the polymerization kinetics and corresponding evolution of the mechanical properties of dental composites

Oréfice, Rodrigo Lambert; Discacciati, José Augusto César; Neves, Alisson Discacciati; Mansur, Herman S.; Jansen, Wellington Corrêa

doi:10.1016/s0142-9418(02)00052-1

Cited by 63 publications

(40 citation statements)

References 11 publications

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“…For these reasons, adequate finishing and subsequent polishing are key to fortifying a restoration against plaque accumulation, possible adsorption of stains, and increased material wear which could compromise the clinical performance of the whole restoration 35) . The staining of dental materials is the result of both extrinsic (surface roughness, poor oral hygiene, nutrition, and material wear) and intrinsic (filler and monomer composition, residual unpolymerized monomers resulting from incomplete polymerization) factors [36][37][38] .…”

Section: Discussionmentioning

confidence: 99%

Effects of different food colorants and polishing techniques on color stability of provisional prosthetic materials

2010

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The main objective was to investigate the effects of different polishing techniques on the color stability of provisional prosthetic materials upon exposure to different staining agents by mimicking the oral environment in vitro. Fifty-six cylindrical specimens were prepared for each type of material: bis-acryl and light-polymerized composite resins, and methyl methacrylate-and ethyl methacrylatebased resins. The specimens were polished using seven different polishing techniques and then immersed in four different staining agents. Color was measured with a spectrophotometer before and after immersion, and color changes (ΔE) were calculated. The effects of the type of provisional material, polishing procedure, staining agent, and their interactions on color stability were significant (p<0.05). Amongst these factors, the staining agent exerted the strongest effect on color stability. Amongst the provisional materials tested, methacrylate-based resins exhibited the highest color stability irrespective of polishing technique and staining agent.

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Section: Discussionmentioning

confidence: 99%

Effects of different food colorants and polishing techniques on color stability of provisional prosthetic materials

2010

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“…This new monomer is capable of being polymerized and continuing the cationic reaction in dark which is called self or dark polymerization 26 . The dark reaction usually is time dependent and may attribute to the strength and hardness of the material 27 .…”

Section: Discussionmentioning

confidence: 99%

Post-irradiation vickers microhardness development of novel resin composites

Marghalani

2010

Mat. Res.

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The aim of this study was to evaluate the effect of post-irradiation dry aging at different periods of time on Vickers microhardness of some dental composites based on various resin matrices. Sixty four disc-shaped specimens of the resin composites were prepared in a split Teflon mold (8 × 2 mm) and irradiated by Optilux 501 light cure (500 mW.cm -2 for 40 seconds) on their top side. The specimens were aged-dry in dark at 23 and 37 °C for the following storage periods; immediate, 1/2 an hour, 1, 6, 12, 24, 48 and 168 hours. The microhardness values were recorded using a Vickers Hardness Tester at 300 g load for 15 seconds. Results showed that Filtek ® P90 and Definite expressed the highest hardness value followed by Tetric Evoceram and then Premise Enamel. At each aging period, all materials demonstrated significant differences between hardness values of top and base surfaces as well as both temperatures examined (P < 0.05). In conclusion, surface hardness developed gradually in most of the materials reaching optimum after 168 hours post-irradiation aging. Dental composites based on silorane and ormocer resin matrices achieved higher Vickers microhardness than those based on dimethacrylates resin.

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“…Indentation experiments have received much attention from numerous researchers for determining the mechanical properties of different biomaterials, see for example (Şakar-Deliormanli and Güden, 2006, Kruzic et al, 2009, Towler et al, 2001, Karimzadeh et al, 2014, Oréfice et al, 2003. According to these studies, indentation tests are independent of the specimen geometry and size and give reliable results.…”

Section: Effect Of Dental Restorative Materials Type and Shade On Charmentioning

confidence: 99%

Effect of Dental Restorative Material Type and Shade on Characteristics of Two-Layer Dental Composite Systems

Karimzadeh

Ayatollahi

Bushroa

2016

Lat. Am. j. solids struct.

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In situ evaluation of the polymerization kinetics and corresponding evolution of the mechanical properties of dental composites

Cited by 63 publications

References 11 publications

Effects of different food colorants and polishing techniques on color stability of provisional prosthetic materials

Effects of different food colorants and polishing techniques on color stability of provisional prosthetic materials

Post-irradiation vickers microhardness development of novel resin composites

Effect of Dental Restorative Material Type and Shade on Characteristics of Two-Layer Dental Composite Systems

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