An FTIR study on the setting mechanism of resin-modified glass ionomer restoratives

Kakaboura, Afrodite; Εliades, George; Palaghias, Georgios

doi:10.1016/s0109-5641(96)80017-0

Cited by 71 publications

(57 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although the 68.38% DC obtained for the TLR composite was significantly lower than that of LCR, both DC values were higher than the previous reported DC range of 45-67% for set orthodontic resins 23) . Moreover, these values were close to those reported by Eliades et al 18) for the different light-, chemical-, or dual-cured orthodontic adhesive resins.…”

Section: Effect On the DC Of Lingual Retainer Compositescontrasting

confidence: 74%

“…Another limitation of this research was the relatively small number of specimens per test group (n=5), although many published studies had used smaller sample sizes 2,6,17,[20][21][22] . According to many researchers that have used different indirect methods to evaluate the DC from monomer to polymer 23) , the DC for restorative resins reportedly ranged from 50% to 80%. To the best of the authors' knowledge, only one report was found in published literature that investigated the DC of lingual retainer composites.…”

Section: Effect On the DC Of Lingual Retainer Compositesmentioning

confidence: 99%

“…At this juncture, it must be clarified that on one hand, the type of composite used could affect the DC considerably 2) ; on the other hand, DC has been found to affect the mechanical properties of composites. Nonetheless, no information is currently available on the effect of DC on the clinical performance of lingual retainer composites 23) . On the effect exerted by the type of composite used on DC, it is noteworthy that the two composite materials tested in this study differed in numerous aspects: viscosity, chemical structure of the dimethacrylate monomer, translucency, photoinitiator concentration, and color tone (shade).…”

Section: Effect On the DC Of Lingual Retainer Compositesmentioning

confidence: 99%

See 2 more Smart Citations

Effects of thermocycling on the degree of cure of two lingual retainer composites

et al. 2010

View full text Add to dashboard Cite

The aim of this study was to evaluate the effects of thermocycling on the degree of cure (DC) and water sorption behavior of two lingual retainer composites. A total of 50 composite specimens, 5 mm diameter and 2 mm height, were prepared using Light Cure Retainer ® (LCR) (Reliance) and Transbond Lingual Retainer ® (TLR) (3M Unitek). After 40-second curing with a halogen light and after 24-hour water storage, the composite specimens were subjected to different thermocycling regimes. Absorbance peaks to monitor the DC were recorded using Fourier transform infrared (FTIR) spectroscopy, while water sorption was calculated in µg/mm 3 . On DC, significant differences among the different thermocycling regimes were observed only for the TLR specimens (p<0.05). On water sorption behavior, an increase in the number of thermal cycles resulted in increased water sorption for both composites, but the statistical differences in these groups were not significant. On the effect of thermocycling up to 20,000 cycles, present findings showed that LCR was less affected than TLR. Further, LCR exhibited higher DC and lower water sorption values than TLR after thermal cycling.

show abstract

Section: Effect On the DC Of Lingual Retainer Compositescontrasting

confidence: 74%

Section: Effect On the DC Of Lingual Retainer Compositesmentioning

confidence: 99%

Section: Effect On the DC Of Lingual Retainer Compositesmentioning

confidence: 99%

See 1 more Smart Citation

Effects of thermocycling on the degree of cure of two lingual retainer composites

et al. 2010

View full text Add to dashboard Cite

show abstract

“…This was attributed to small specimen thickness and the relatively transparent glasses used in modern RMGIs, which allow higher levels of light transmittance. 15 This may par-tially explain the favorable DC of the RMGI in this study. The Variolink II is also a dual-cure material, and final double-bond conversion may differ from those measured initially.…”

Section: Discussionmentioning

confidence: 64%

Polymerization Efficiency of Glass-Ionomer and Resin Adhesives under Molar Bands

Rejman

Eliades

Bradley

et al. 2008

The Angle Orthodontist

Self Cite

View full text Add to dashboard Cite

Objective: To determine the degree of cure of a light-cured resin-modified glass ionomer (RMGI) under molar bands compared with a light-cured resin and a dual-cured resin. Materials and Methods: The 3 cements used were Fuji Ortho LC, Eagle Spectrum resin, and Variolink II dual-cure. Each sample was indirectly light cured for 20 seconds (10 seconds occlusally, 10 seconds cervically) under sections of molar bands, and the degree of cure was evaluated with micro-MIR FTIR spectroscopy. Results: The RMGI exhibited a significantly higher mean degree of cure (55.31%) than both of the resins (Eagle 19.23%; Variolink II, 25.42%), which did not differ significantly at ␣ ϭ .05 level of significance. Conclusion: Higher degree of conversion can be obtained from RMGIs under molar bands compared with composite resin adhesives provided the proper curing technique is used.

show abstract

“…12 Recent studies have shown the acid-base and photo-initiated free-radical reactions inhibit each other, with photopolymerization of RMGIs reducing the acid-base reaction. 10,13 Another recent study concluded that the acid-base induced chemical interaction between RMGI and dentin is the main mechanism of bonding with RMGI. 14 Therefore, it is hypothesized that RMGIs allowed to polymerize without light activation will develop bond strength through the ionic bonding between RMGIs and dentin and should therefore have an equivalent or higher bond strength than light-cured RMGIs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Light Activation on Resin-modified Glass Ionomer Shear Bond Strength

Lawson

Çakır²,

Beck³

et al. 2012

Operative Dentistry

View full text Add to dashboard Cite

SUMMARY Objective Recent studies confirmed that resin-modified glass ionomers (RMGIs) set on the basis of two competing mechanisms, an acid-base reaction and a light-activated resin polymerization. This study evaluated the effect of the setting mechanism on bond strength by measuring the shear bond strength of three RMGIs to dentin with and without light activation. Methods Sixty human molars were ground to midcoronal dentin and randomly divided into six even groups: 1) Ketac Nano (KN), 2) KN without light cure (woLC), 3) Fuji Filling LC (FF), 4) FF woLC, 5) Fuji II LC (FII), and 6) FII woLC. The dentin surfaces of the specimens were conditioned/primed according to the manufacturers' instructions. A 1.54-mm diameter plastic tube was filled with RMGI material and affixed to the dentin surface. Groups 1, 3, and 5 were light cured for 20 seconds, and groups 2, 4, and 6 were immediately placed in a damp dark box with no light curing at 37°C for 24 hours. Shear bond strength testing was performed in an Instron device at 1 mm/min. Data were analyzed with a one-way analysis of variance (ANOVA) and Tukey/Kramer test (α=0.05). Results Mean ± standard deviation shear bond strength values (MPa) are: 7.1 ± 4.2 (KN), 11.7 ± 3.9 (FF), 10.2 ± 3.2 (FF woLC), 12.5 ± 5.1 (FII), and 0.3 ± 0.4 (FII woLC). Two KN, all KN woLC, and seven FII woLC specimens debonded before testing. Tukey/Kramer analysis revealed no significant differences in bond strength between the three light-cured RMGIs. KN and FII showed significantly lower bond strength without light cure, but no significant difference was observed between FF and FF woLC. Conclusions The results of this study strongly suggest that light activation is necessary to obtain optimal bond strength between RMGI and dentin. FF may contain components that chemically activate resin polymerization. Clinically, KN and FII need to be light cured after placement of these RMGIs.

show abstract

An FTIR study on the setting mechanism of resin-modified glass ionomer restoratives

Cited by 71 publications

References 7 publications

Effects of thermocycling on the degree of cure of two lingual retainer composites

Effects of thermocycling on the degree of cure of two lingual retainer composites

Polymerization Efficiency of Glass-Ionomer and Resin Adhesives under Molar Bands

Effect of Light Activation on Resin-modified Glass Ionomer Shear Bond Strength

Contact Info

Product

Resources

About