Advani posted his only century break of 110 in the eighth game of the match, which almost dashed the hopes of Gilchrist to win the title as he trailed 3-5 against the Indian cueist.
Advani began on a strong note by pocketing the first two games, 150 points against 33 and 150 against 95.
However, Gilchrist bounced back in the next two games by winning 150 points against 124 and 150 against 101, after he engineered 112 and 89 break points in third and fourth games.
The 79-break point in the sixth game helped Advani to take a 4-2 lead over his opponent, but could not sustain it as he lost the seventh game after Gilchrist broke twice with 86 and 53 break points.
Eighth and ninth games belonged to Advani, especially the final one, as he shattered the hopes of Gilchrist by posting a thumping 150 against 15 points, and laid claim to his eleventh world billiards championship.
Earlier, Advani had beaten Htay 5-0 in the morning to storm into the finals while Gilchrist defeated India’s Dhvaj Haria 5-1 in another semi-final.