Online published on 15 May, 2014.
To assess the influence of nanofilled, and nanoceramic, composite restorative systems on the fracture resistance of maxillary premolars with Class II mesio-occlusodistal (MOD) cavities.
30 sound maxillary human premolars were divided into 3 groups of 10 teeth each. Teeth in the first group were left intact and tested as unprepared positive controls. Teeth in the remaining two groups were prepared with MOD cavities and were restored with an a nanofilled composite (Ice, SDI), a nanoceramic composite (CeramX mono). The specimens were loaded occlusally in a universal testing machine using a metal sphere that contacted only the teeth on the cuspal inclines until fracture occurred. The results were analyzed by Kruskal-Wallis and Mann-Whitney U tests. The level of significance was set at.05.
The difference between the mean cuspal fracture resistance of the unprepared positive control teeth and those restored with ormocer, nanofill, and microhybrid composite was found to be statistically significant (P <.05). No statistically significant difference in cuspal fracture resistance was found between the unprepared positive control teeth and those teeth restored with nanoceramic composite (P>.05).
Under compressive load testing, teeth with microhybrid, ormocer, and nanofilled composite restorations had lower cuspal fracture resistance than those with nanoceramic composite restorations.
