Comparative study of molar and incisor bite forces regarding deciduous, mixed, and definitive dentition.

Objective : To compare maximum incisor ( MBFinc ) and molar ( MBFmol ) bite forces regarding the type of dentition and sex and to establish a relationship between them. Methods : One hundred-five individuals were divided into 3 groups: G1 - 22 females/13 males (4-5 years); G2 - 15 females/20 males (11-12 years); and G3 - 16 females/19 males (17- 18 years). The maximum bite force was recorded with an extraoral measuring device. Three measurements were recorded: right and left molar level ( MBFmol ) and incisor level ( MBFinc ). The ratio % MBFinc/MBFmol was determined. Results : MBFmol and MBFinc values increased with age ( p < 0.05). MBFmol showed statistically higher values than MBFinc ( p < 0.05), when compared within the same group. Conclusion : MBFinc and MBFmol increased with age. For all groups, MBFmol showed higher values than MBFinc , and % MBFinc/MBFmol ratio was 1:2. No differences were found in maximum bite force between sexes.