Abstract

ARNOLD, S; BUCHANAN, G D; WARREN, N  and  POTGIETER, N. Comparison of capsule-mixed versus hand-mixed glass ionomer cements Part II: Porosity. S. Afr. dent. j. [online]. 2022, vol.77, n.2, pp.65-72. ISSN 0375-1562.  http://dx.doi.org/10.17159/2519-0105/2022/v77no2a2.

INTRODUCTION: Glass ionomer restorative cements (GIC) are routinely used in dental practice. During mixing, air incorporation may lead to higher porosity with subsequent weakening of the cement. The degree of porosity will determine whether capsule-mixed or hand-mixed GIC are mechanically stronger for clinical use AIM: To compare the porosity of four commercially available dental glass ionomer cements, supplied in both hand-mix and capsule-mix formulations, by evaluating number of voids (%), total volume of voids (mm³) and volume percentage of voids (% METHODS: Eighty samples were manufactured from hand-mixed GIC: Riva Self Cure; Fuji IX GP ; Ketac Universal, Ketac Molar Easymix, and equivalent capsule-mixed GIC: Riva Self Cure; Fuji IX GP ; Ketac Universal Aplicap and Ketac Molar Aplicap. Micro-CT scanning was used to evaluate porosity. The number of voids (mm³), total volume of voids (mm³) and the volume percentage of voids (%) were calculated RESULTS: Riva Self Cure Capsules showed significantly less volume of voids (P = 0.005) and volume percentage of voids (P = 0.005) than Riva Self Cure hand-mixed. Fuji IX GP hand-mixed showed a higher number of voids (P < 0.001), but lower volume and volume percentage of voids (P < 0.001) when compared to Fuji IX GP capsules. The number of voids (P < 0.001), volume of voids (P = 0.004) and volume percentage of voids (P = 0.004) were significantly lower for both Ketac Universal and Ketac Molar capsules versus their hand-mixed equivalents CONCLUSION: Three capsulated forms of glass ionomer cements (Riva Self Cure, Ketac Universal and Ketac Molar) demonstrated decreased porosity, and may therfore be advantageous for clinical application

Keywords : Glass ionomer cement; Capsule-mix; Handmix; Micro-CT; Porosity.

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