The author had studied the masticatory efficiency on three different types; on missing of the first molar, on replacing the missed first molar with crown & bridge and on natural dentition. This study was made from the parched soybeans as testfood by means of mesh technique.
As a result of this study on 25 of natural dentitions, 20 of crown & bridges and 25 of missing of the first molars, the followings were come out.
1. Masticatory efficiency of natural dentitions was 75.8%, that of crown & bridges was 66.4%, and that of missing of the first molars was 43.7%.
2. Difference of masticatory efficiency of crown & bridges to natural dentitions was 0.4%, that of natural dentitions to missing teeth was 32.1%, and that of crown & bridges to missing teeth was 22.7%