Objectives: The retention of a complete denture is diretly related to the adaptation of the base to the supporting oral tissues.This study investigated a resin anchoring system on the adaptation of denture base resin to the master cast. Methods: Thirty identical polymethyl metacrylate dentures were fabricated on master cast. Ten of the master casts were altered by the addition of anchoring holes along the posterior land area and formed the palatal anchoring group (PG). Ten of the master casts were also altered by the addition of anchoring holes along total periferic land area and formed the total anchoring group (TG). Anchoring holes were made a # 8 round bur to depth of 5mm.The control group (CG) was composed by ten master casts without alterations. All of dentures bases (PG,TG and CG) were obtained from polymerization conventional technique. A cut was made across the previous determined posterior palatal border of the pair cast-basis. The midpalate point checked with the use of a measuring microscope. Results: The dates were submited to ANOVA as well as Tukeyxs teste with p=0.05. The total anchoring group (TG) with mean=0.221 and SD=0.176 showed on statistically significant difference when compared to the control group (GC) with mean=0.479 and SD= 0.197. Besides, the palatal anchoring group, PG with mean=0.363 and SD=0.193 exhibited no statistically significant difference compared to the other two groups.Conclusion: The mechanical complete periferic anchoring system of the resin basis decreased significantly the gap between the casts and the resin basis in posterior limit midpalate location.

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