An in vitro investigation of a poly (vinyl phosphonic acid) based cement with four conventional glass-ionomer cements

Khouw-Liu, V.H.W; Anstice, H. M.; Pearson, G.J.

doi:10.1016/s0300-5712(98)00062-1

Cited by 16 publications

(14 citation statements)

References 10 publications

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“…A previous study reported that the hardness of contemporary glass ionomers was not adversely affected by early exposure to water. 24 Leirskar and others found that early access to water increased the strength of a high strength auto-cured cement. 12 In this study, the authors found that early water contact did not positively or negatively influence the shear strength of glass ionomers.…”

Section: Discussionmentioning

confidence: 96%

Effect of Early Water Exposure on the Strength of Glass Ionomer Restoratives

Wang

Yap

Ngo

2006

Operative Dentistry

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This study examined the effect of early water exposure on the shear strength of a spectrum of glass ionomer restoratives. The materials evaluated included conventional auto-cured (Fuji II [FT], GC), resin-modified light-cured (Fuji II LC [FL]) and, recently introduced, high strength auto-cured (Fuji IX GP Fast [FN], GC; Ketac Molar Quick [KQ], 3M-ESPE; Ketac Molar [KM], 3M-ESPE) cements. Sixteen specimens (8.7-mm in diameter and 1-mm thick) of each material were prepared in metal washers and randomly divided into 2 groups. The specimens were allowed to set for 6 minutes between polyester strips, to ensure completion of the initial set. The strips were subsequently removed, and the surfaces of Group 1 specimens were coated on both sides with resin (Fuji Coat LC, GC) and light cured for 10 seconds. Group 2 specimens were left uncoated. All specimens were then conditioned in distilled water at 37 degrees C for 4 weeks. After conditioning, the specimens were restrained with a torque of 2.5 Nm and subjected to shear punch testing using a 2-mm diameter punch at a crosshead speed of 0.5-mm/minute. The mean shear strengths of the materials were computed and subjected to Independent Samples t-test and ANOVA/Scheffe's tests at significance level 0.05. Mean strength ranged from 78.34 to 99.36 MPa and 79.88 to 95.78 MPa for Groups 1 and 2, respectively. No significant difference in shear strength was observed between the 2 groups. For both groups, KM and KQ were significantly stronger than FT. Contrary to current teaching, early exposure to water did not weaken glass ionomer restoratives. A marginal increase in strength was actually observed for some materials.

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Section: Discussionmentioning

confidence: 96%

Effect of Early Water Exposure on the Strength of Glass Ionomer Restoratives

Wang

Yap

Ngo

2006

Operative Dentistry

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“…on the cement properties. 23,25,26 As glass-ionomer cement is susceptible to humidity, it is recommended that its surface be coated during the initial curing phase, that is, soon after loosing its surface brightness. 10,18 However, glass-ionomer cements have a slow curing process and during this phase, they are susceptible to saliva and water attacks, which dissolve such materials.…”

Section: Resultsmentioning

confidence: 99%

The influence of protective varnish on the integrity of orthodontic cements

Caldeira

Izquierdo

Giacomet

et al. 2013

Dental Press J. Orthod.

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“…In the current study, non‐destructive ultrasonic testing was applied to monitor the setting processes of glass–ionomer cements, based on the relationship between the ultrasonic velocities and the elastic constants described by a micromechanical model (21). Unlike the surface‐hardness‐measurement method (22), the ultrasound approach does not define the setting reaction as the time point when the cement reaches a specific strength; rather, it monitors the viscoelastic properties of the materials. At the beginning of the ultrasonic measurement, the longitudinal velocity in the cement mix could not be detected for FI, FL, and KC.…”

Section: Discussionmentioning

confidence: 99%

Ultrasonic monitoring of the setting of glass–ionomer luting cements

Mori

Inage

Kawamoto

et al. 2008

European J Oral Sciences

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This study used ultrasonic measurements to monitor the setting behaviour, and changes in the elastic modulus, of glass-ionomer cements. The ultrasonic equipment comprised a pulser-receiver, transducers, and an oscilloscope. The two-way transit time through the mixing cement disk was divided by two, in order to account for the down-and-back travel path, and then multiplied by the sonic velocity within the material. The sonic velocities of the longitudinal and shear waves were used to determine the elastic modulus. In the earliest stages of the setting process, most of the ultrasound energy was absorbed by the cements and the second echoes were relatively weak. As the cements hardened, the sound velocities increased until they reached a plateau. The changes in sound velocities differed among the glass-ionomer cements tested. The mean elastic moduli of the specimens ranged from 2.6 to 6.2 GPa after 15 min, from 13.4 to 20.4 GPa after 24 h, and from 11.4 to 22.4 GPa after 1 month. The ultrasonic method used in this study has considerable potential for determining the setting processes of luting cements.

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An in vitro investigation of a poly (vinyl phosphonic acid) based cement with four conventional glass-ionomer cements

Cited by 16 publications

References 10 publications

Effect of Early Water Exposure on the Strength of Glass Ionomer Restoratives

Effect of Early Water Exposure on the Strength of Glass Ionomer Restoratives

The influence of protective varnish on the integrity of orthodontic cements

Ultrasonic monitoring of the setting of glass–ionomer luting cements

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