• Peerapong Kupradit D.D.S., Grad Dip. (Oper. Dent)
• Vasana Patanapiradej D.D.S., High Grad Dip. (Endodont), M.D.S., Thai board (Oper. Dent)
• Charuphan Oonsombat D.D.S., Grad Dip.(Oper. Dent).,Cert. in Oper. Dent., M.S., ABOD

Objective To compare the volume loss and mean depth in abrasive wear of 2 conventional glass
ionomer cements (Ketac fil plus aplicap^® and Fuji IX GP capsule^®) and 2 resin-modified glass
ionomer cements (Ketac N-100^® and Fuji II LC capsule^®) after brushing, in vitro.

Materials and methods 128 specimens were prepared in metal mold. The samples were equally
divided into 4 groups according to materials tested, which were Ketac fil plus aplicap^®, Fuji IX GP
capsule^®, Ketac N-100^® and Fuji II LC capsule^®. Volume loss and mean surface depth of each sample
were measured using a Profilometer. Using 8 samples per cycle, the specimens were brushed using
V-8 Cross Brushing Machine at 20,000 strokes, 90 cycles per minute, with a brush-head load 150
grams in a toothpaste slurry. Changes in volume loss and mean surface depth of each sample
after brushing were measured and statistically analyzed, using Kruskal-Wallis test at a significant
level of 0.05.

Results Changes in volume loss and mean depth after brushing of Ketac fil plus aplicap^® showed
significantly different from those of Ketac N-100^®, Fuji II LC capsule^® and Fuji IX GP capsule^®
(p = 0.003 0.005 and 0.031 respectively) but no significant difference was observed between Fuji IX
GP capsule^® and Fuji II LC capsule^® or Ketac N-100^®.

Conclusion Wear of Ketac fil plus aplicap^® was different from resin-modified glass ionomer cements
(Ketac N-100^® and Fuji II LC capsule^®) and another conventional glass ionomer cement (Fuji IX GP
capsule^®).

(CU Dent J. 2010;33:119-30)