Please use this identifier to cite or link to this item: https://doi.org/10.2341/05-106
Title: Effect of early water exposure on the strength of glass ionomer restoratives
Authors: Wang, X.Y.
Yap, A.U.J. 
Ngo, H.C.
Issue Date: 2006
Source: Wang, X.Y., Yap, A.U.J., Ngo, H.C. (2006). Effect of early water exposure on the strength of glass ionomer restoratives. Operative Dentistry 31 (5) : 584-589. ScholarBank@NUS Repository. https://doi.org/10.2341/05-106
Abstract: 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°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.
Source Title: Operative Dentistry
URI: http://scholarbank.nus.edu.sg/handle/10635/46848
ISSN: 03617734
DOI: 10.2341/05-106
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