The Azzurri had just a single victory to their name from their four previous appearances in the tournament but beat Tonga and Canada in Australia to mark a new era in Italian rugby.
"The historic result achieved in Australia has given us a lot of confidence and more strength," Bollesan said.
"It has proved that the work that has been carried out in recent years is producing results."
Under the guidance of New Zealand-born coach John Kirwan, Italy are now keen to add to the two victories they have achieved in the Six Nations since their inclusion in 2000.
Italy took the scalp of Scotland in their debut year and produced a stunning display to beat Wales 30-22 last season.
Bollesan added: "We not only want to equal the results achieved in the World Cup but also show the same spirit.
"To take one victory just as we did last year would be a good result for Italy. We have to remember that in this competition we face the rugby elite.
"But to surpass this mark would be a real breakthrough."