Influence of Polymerization Mode on Degree of Conversion and Micropush-out Bond Strength of Resin Core Systems Using Different Adhesive Systems

Cekic‐Nagas, Isil; Ergün, Gülfem; Vallittu, Pekka K.; Lassila, Lippo

doi:10.4012/dmj.27.376

Cited by 27 publications

(25 citation statements)

References 33 publications

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“…Therefore, it can be concluded that, in CD and CM, light-curing is the predominant character, which has been previously reported for CD. 5,[7][8] The results of the current study confirmed previous findings that the polymerization behavior of DCB is strongly material-dependent. 4 Since no quantitative monomer composition is given for the materials tested, no conclusions can be drawn on the monomer contribution to the curing efficiency.…”

Section: Discussionsupporting

confidence: 81%

Monomer Conversion in Dual-cured Core Buildup Materials

Kournetas¹,

Tzoutzas²,

Εliades³

2011

Operative Dentistry

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Objectives: To examine the impact of self-curing (SC) and light-curing (LC) mechanisms on the curing efficiency of dual-cured buildup restorative materials (DCB).Methods: The DCB materials tested were: Clearfil DC Core Automix (CD), Cosmecore DC (CM), LuxaCore DC (LX) and MultiCore DC Flow (MC). The SC material Clearfil Core New Bond (CN) and the LC material Clearfil Photo Core (CP) were used as controls. Specimens (Ø=4 mm, d=1 mm, n=4) of DCB materials prepared without light-exposure were tested after 10-, 20-, 30-and 60-minutes of storage in dark and dry conditions (37°C), whereas DCB specimens light-cured immediately after mixing (20 seconds, 850mW/cm 2 ) served as a reference. The amount of remaining C=C bonds (%RDB) was measured on the bottom specimen surfaces using ATR-FTIR spectroscopy. One-way ANOVA and multiple comparison tests were used to evaluate the statistically significant differences (α α=0.05).Results: Polymerization mode had a strong effect on the polymerization efficacy of the DCB materials (p<0.0001). The control materials (CN, CP) performed better than the DCB materials (p<0.0001), except for LX in the LC mode. LX and MC showed better SC conversion during the initial 20-minute period. After 60 minutes, the %RDB values of CM were still above 60%, whereas in CD and LX, they reached the level of LC specimens.Conclusions: The LC initiation mechanism of the DCB materials that were tested resulted in better C=C conversion when compared to their native SC mechanisms. The SC and LC control

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Section: Discussionsupporting

confidence: 81%

Monomer Conversion in Dual-cured Core Buildup Materials

Kournetas¹,

Tzoutzas²,

Εliades³

2011

Operative Dentistry

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“…Moreover, this flowable universal nano-hybrid composite has lower viscosity facilitating molecular mobility and higher degree of monomer conversion. Lower viscosity results in greater DC% increasing the mobility of molecules (16). Additionally, its silicon-dioxide nano-particles are designed to covalently bond to polymeric resin, increasing the conversion rate of the material C, though reducing the possible releasing of toxic compounds.…”

Section: Discussionmentioning

confidence: 99%

The cytotoxicity of resin composites cured with three light curing units at different curing distances

Ergün

Eğilmez²,

Cekic‐Nagas³

2011

Med Oral

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Objective: The purpose of this study was to compare the effect of light curing distance on the cytotoxicity of five resin composites cured with three high-power light curing units. Study design: Seven cylindrical discs of each material (Grandio ®, Voco; Filtek ™ Z250, 3M ESPE; Clearfil ™ AP-X, Kuraray Co. Ltd.; Aelite ™ LS, Bisco Inc. and Simile ®, Pentron) were cured. For curing, soft-up mode of quartz-tungsten-halogen, exponential mode of light emitting diode for 20 s, and ramp-curing mode of plasma arc light curing units for 6 s were used. The curing tip distances were determined as 2 and 9 mm and controlled via the use of metal rings. After ageing the samples for 24 and 72 hours in Dulbecco's Modified Eagle Medium/Ham's F12 (DMEM/F12), cytotoxicity of the extracts to cultured fibroblasts (L 929) was measured by using MTT (tetrazolium salt 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay. The degree of cytotoxicity for each sample was determined according to the reference value represented by the cells in a pure culture medium. Statistical significance was determined using multifactorial analysis of variance. Results: The type of resin composite (p<0.05), light curing unit (p<0.05), curing tip distance (p<0.05) and evaluation period factor (p<0.05) had statistically significant cytotoxic effects on L-929 mouse fibroblast cells. However, when the tested materials polymerized at both distances (2 mm and 9 mm) in both evaluation periods (24h and 72h), there was no significant difference in the mean CSR% values obtained when the quartz-tungsten-halogen, light emitting diode and plasma arc light curing units were used (p=0.184, F=1.448). Conclusions: The results of this study suggest that the light curing units and resin composites should be harmonized to one another and the curing distance between the tip of the light curing unit and the restoration surface should be as close as possible in order to achieve maximal biocompatibility.

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“…To improve adhesion, the following concerns should be addressed: the adhesive interface should be protected from humidity and contamination, and that the bonding agent and resin composite should be sufficiently light-cured to ensure complete polymerization [30][31][32] . Some studies have shown that the incremental filling technique for light-cured resin composites improved the bond strength between the resin composite and the dentin at the cavity floor 33) .…”

Section: Discussionmentioning

confidence: 99%

Effect of reinforcement with resin composite on fracture strength of structurally compromised roots

et al. 2009

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This study was aimed at evaluating the fracture resistance of structurally compromised roots restored with four different post and core systems. Thirty-two bovine roots were uniformly shaped to simulate human mandibular premolar roots. The roots were divided into four groups based on the type of restoration: cemented cast post and core (Group MC), resin composite build-up (Group CR), resin composite and prefabricated glass fiber post build-up (Group FRC), and thick-layer dual-cured resin composite-reinforced smalldiameter tapered cast post and core (Group CRM). After a static loading test, the failure mode and fracture resistance were recorded. Group CRM (719.38±196.73 N) exhibited a significantly high fracture resistance compared with the other groups (Group MC: 429.56±82.43 N; Group CR: 349.56±66.21 N; Group FRC: 398.94±112.71 N; p<0.05). In conclusion, Group CRM exhibited better mechanical properties for structurally compromised roots with no ferrules, although all types of restorations showed non-restorable fracture modes.

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Influence of Polymerization Mode on Degree of Conversion and Micropush-out Bond Strength of Resin Core Systems Using Different Adhesive Systems

Cited by 27 publications

References 33 publications

Monomer Conversion in Dual-cured Core Buildup Materials

Monomer Conversion in Dual-cured Core Buildup Materials

The cytotoxicity of resin composites cured with three light curing units at different curing distances

Effect of reinforcement with resin composite on fracture strength of structurally compromised roots

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