Materials and Methods: The following groups were evaluated: sound natural dentition (ND; n=15), fixed implant-supported mandible prosthesis with fixed maxilla prosthesis (ISP-F; n= 8), fixed implant-supported mandible prosthesis with removable maxilla prosthesis (ISP-R; n= 14), implant-retained mandible overdenture (OD; n=16), and complete dentures (CD; n=16). The tests were carried out by means of the test food “Optocal” with 40 chewing cycles. The MP index was obtained by calculating the percentage of reduction of the geometric diameter mean (GMD) of the chewed particles.
Results: The reduction for the groups were 70.27% ± 3.37 for ND, 41.52% ± 14.91 for ISP-F, 31.44% ± 17.72 for ISP-R, 27.70% ± 17.46 for OD, and 14.33% ± 14.52 for CD. The results were compared by the Students' t-test (P<0.05). Group ND was statistically different from all others. Group CD showed statistically significant difference when compared to ISP-F, ISP-R and OD. Groups ND and CD presented the higher and lower GMD values, respectively.
Conclusions: The retention of the prosthesis when connected to osseointegration implants improved masticatory performance of all implant-supported groups when compared to ND. The masticatory performance of ISP-F, ISP-R, OD, and CD groups were 59.09%; 44.74%; 39.42% and 20.39%, respectively.