IADR Abstract Archives
Esthetic Properties of Novel Dental Nanocomposites
The objective of this work was to prepare experimental nanocomposites (ENC) from novel nano-sized fillers and to study their effect on esthetic properties of the resulting nanocomposites. Two types of filler particles were used: (a) non-aggregated and non-agglomerated silica particles, nanomers (NM), of 5 or 20nm, and (b) loosely bounded agglomerate of zirconia and silica, nanoclusters (NC), of primary particle size < 50nm. The dimension of the NM and ratio of NM to NC were varied to see their effect on the esthetic properties. Highly polished samples were toothbrushed (TB) for up to 500 times and the gloss retention (GR) of the samples were measured by a micro-tri-gloss instrument. The table shows the GR of various experimental formulations after 200 and 500 strokes of toothbrushing. Commercial composites microfill FiltekA110 (A), hybrid TPH specturm (T) and microhybrids EsthetX (E) and Point4 (P) were tested as comparison
|
ENC |
1 |
2 |
3 |
4 |
5 |
6 |
|
NM size (nm) |
- |
5 |
5 |
20 |
20 |
75 |
|
NM % by wt |
0 |
11.7 |
22.3 |
11.9 |
22.6 |
100 |
|
NC % by wt |
100 |
88.3 |
77.7 |
88.1 |
77.4 |
0 |
|
GR at 200 TB (sd) |
91.3 (0.1) |
87.4 (0.1) |
93.3 (0.1) |
94.6 (0.2) |
94.5 (0.3) |
96.8 (0.3) |
|
GR at 500 TB (sd) |
69.9 (0.3) |
79.8 (0.9) |
88.2 (0.4) |
88.9 (0.1) |
90.4 (0.2) |
95.1 (0.2) |
GR of the commercial composites after 200TB and 500TB were A 92.5 (0.1) and 83.6 (0.2); T 82.6 (0.3) and 47.4 (0.1); E 85.9 (0.5) and 48.4 (0.2); P 70.6 (0.4) and 42.3 (0.3). ANOVA analysis showed that at p<0.05 all the ENCs tested has better polish retention after 500 TB compared to commercial hybrid and microhybrid materials tested. Majority of ENCs containing NM showed polish retention equivalent to or suporior than the microfill tested.